Final California 2012 Integrated Report( 303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Klamath River HU, Middle HA, Iron Gate Dam to Scott River
Water Body ID:	CAR1053505320011215015907
Water Body Type:	River & Stream


DECISION ID	28392	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Sediment
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. If the weight of evidence indicates attainment, the water segment shall be removed from the section 303(d) list. Eleven lines of evidence are available in the administrative record to assess this pollutant in the Beaver Creek watershed. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing Beaver Creek, Cow Creek, Deer Creek, Hungry Creek, and West Fork Beaver Creek from the section 303(d) list for sediment (i.e. sufficient justification to not delist). This conclusion is based on the staff findings that: (A) The weight of evidence demonstrates that sediment conditions in Beaver Creek, Cow Creek, Deer Creek, Hungry Creek, and West Fork Beaver Creek do not attain sediment objectives and/or evaluation guidelines, in compliance with Section 4.11 of the Listing Policy, as described below: Primary evidence of impairment: (1) Beaver Creek exceeds the percent fines (LOE 31608) and embeddedness (LOE 31612) guidelines. (2) Cow Ck exceeds the percent fines (LOE 31609) and embeddedness (LOE 31611) guidelines. (3) Deer Ck exceeds the percent fines (LOE 31609) and embeddedness (LOE 31611) guidelines. (4) Hungry Ck exceeds the percent fines (LOE 31609) and embeddedness (LOE 31611) guidelines. (5) West Fork Beaver Ck exceeds the percent fines (LOE 31607) and embeddedness (LOE 31610) guidelines. Supporting evidence of impairment: (1) Beaver Creek Watershed shows pool reduction as a result of the flood of 1997 (LOE 25700) and cumulative impacts (LOE 25691), which exceed the sediment water quality objective. (2) The following subwatersheds in the Beaver Creek Watershed exceed the road density (LOE 25709) guideline: Buckhorn Creek Subwatershed, Bumblebee Creek Subwatershed, Cow Creek Subwatershed, Hungry Creek Subwatershed, Grouse Creek Subwatershed, West Fork Beaver Creek Subwatershed. Evidence of supporting conditions: V* values from Beaver Creek and Grouse Creek do not exceed the evaluation guideline used to interpret the suspended sediment objective. (B) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (C) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (D) Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that Beaver Creek, Cow Creek, Deer Creek, Hungry Creek, and West Fork Beaver Creek should not be removed from the section 303(d) list for sediment because applicable water quality standards for the pollutant are being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32746

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

HABITAT ASSESSMENT

Data Used to Assess Water Quality:

The V* value for the reach in Grouse Creek was 0.197 (20%) which is less than the desired condition of 21%. For V* determinations, fine sediment was defined as sand and gravel deposits with a median grain size (D50) ,11 mm, following the suggestions of Hilton and Lisle (1993).

Data Reference:

Quantitative linkages among sediment supply, streambed fine sediment, and benthic macroinvertebrates in northern California streams. J. N. Am. Benthol. Soc. 2008. 27(1):135-149.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The salmonid freshwater habitat desired condition for V* is less than or equal to 0.21 or 21%. This numeric value is applicable in 3rd order streams with slopes between 1% and 4%. The V* desired condition value is only applicable to streams that drain watersheds geologically composed of the Franciscan Formation.

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Eleven to 20 pools were surveyed at site GRO in Grouse Creek. V* values from all pools in a reach were weighted by the residual pool volumes and averaged to obtain a reach-wide V* value. Watersheds and study reaches met the following criteria: 1) stream channel gradient between 1.5 and 4%, 2) gravel and cobble substrate, 3) bedrock lithology that produces abundant fine sediment (predominantly sand-sized particles from highlyweathered granitic plutons), 4) no recent channel scouring debris flows that directly affected the sampling reach, 5) known use by anadromous fishes, and 6) minimal human land use other than forest management activities (i.e., timber harvest, roads, recreation, and grazing).

Temporal Representation:

The study site in Grouse Creek (GRO) was sampled during the Autumn of 2003.

Environmental Conditions:

QAPP Information:

Data were published in J. N. Am. Benthol. Soc., 2008, 27(1):135-149, as "Quantitative linkages among sediment supply, streambed fine sediment, and benthic macroinvertebrates in northern California streams" by Cover et al.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31611

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

3 of 3 samples from Deer Creek, Cow Creek, and Hungry Creek in the Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, Beaver Creek and its Tributaries from headwaters to the confluence with the West Fork of Beaver Creek water body exceeded the evaluation guideline. The sample values were 52% embeddedness, 48% embeddedness, and 42% embeddedness respectively. This LOE and LOEs 31610 and 31612 replace LOE 25690.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the "Klamath National Forest Land and Resource Management Plan" (USFS 2001), also known as the Forest Plan: Less than 20% embeddedness values in the channel substrate. Per the "Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices" (North Coast RWQCB 2006), embedded gravels can be cemented into the stream substrate, generally do not lift out easily, and can prevent spawning salmonids from building their redds to lay eggs. Embedded gravels also contain high levels of fine material, which reduces the permeability in the egg pocket and can slow growth and cause mortality.

Guideline Reference:

Klamath National Forest Land and Resource Management Plan 1995 (including all amendments as of 11/21/01). Siskiyou County, CA and Jackson County, OR. Pacific Southwest Region, United Stated Department of Agriculture Forest Service

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

One sample was collected in each of the following creeks: Deer Creek, Cow Creek, and Hungry Creek.

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31612

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

1 of 1 samples from Beaver Creek exceeded the evaluation guideline. The sample value was 53% embeddedness. This LOE and LOEs 31610 and 31611 replace LOE 25690.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Samples were collected in Beaver Creek.

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32725

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

HABITAT ASSESSMENT

Data Used to Assess Water Quality:

The V* value for the reach in Beaver Creek was 0.102 (10%) which is less than the desired condition of 21%. For V* determinations, fine sediment was defined as sand and gravel deposits with a median grain size (D50) ,11 mm, following the suggestions of Hilton and Lisle (1993).

Data Reference:

Quantitative linkages among sediment supply, streambed fine sediment, and benthic macroinvertebrates in northern California streams. J. N. Am. Benthol. Soc. 2008. 27(1):135-149.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Eleven to 20 pools were surveyed at site BEA in Beaver Creek. V* values from all pools in a reach were weighted by the residual pool volumes and averaged to obtain a reach-wide V* value. Watersheds and study reaches met the following criteria: 1) stream channel gradient between 1.5 and 4%, 2) gravel and cobble substrate, 3) bedrock lithology that produces abundant fine sediment (predominantly sand-sized particles from highlyweathered granitic plutons), 4) no recent channel scouring debris flows that directly affected the sampling reach, 5) known use by anadromous fishes, and 6) minimal human land use other than forest management activities (i.e., timber harvest, roads, recreation, and grazing).

Temporal Representation:

The study site in Beaver Creek (BEA) was sampled during the Autumn of 2003.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31610

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

1 of 1 samples from West Fork Beaver Creek in the the Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, West Fork Beaver Creek and its Tributaries water body exceeded the evaluation guideline. The sample value was 34% embeddedness. This LOE and LOEs 31611 and 31612 replace LOE 25690.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Samples were collected in West Fork Beaver Creek.

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31609

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

3 of 3 samples from Deer Creek, Cow Creek, and Hungry Creek in the Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, Beaver Creek and its Tributaries from headwaters to the confluence with the West Fork of Beaver Creek water body exceeded the evaluation guideline. The sample values were 50% fines, 29% fines, and 34% fines respectively. This LOE and LOEs 31607 and 31608 replace LOE 25689.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the "Klamath National Forest Land and Resource Management Plan" (USFS 2001), also known as the Forest Plan: Less than 15% fines of the substrate composition as the area weighted average in spawning habitat. Per the "Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices" (North Coast RWQCB 2006), fine sediment particles in the substrate of a waterbody have the potential to fill the interstitial spaces of gravels used by salmonids to hold and incubate eggs, suffocating the eggs. Fines from 1.0 mm to 10.0 mm in diameter are also capable of blocking fry emergence. High amounts of fines can result in reduced embryo and fry survival and have deleterious effects on the cold water fishery beneficial uses.

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

One sample was collected in each of the following creeks: Deer Creek, Cow Creek, and Hungry Creek.

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31608

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

1 of 1 samples from Beaver Creek exceeded the evaluation guideline. The sample value was 34% fines. This LOE and LOEs 31607 and 31609 replace LOE 25689.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Samples were collected in Beaver Creek

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31607

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

1 of 1 samples from West Fork Beaver Creek in the the Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, West Fork Beaver Creek and its Tributaries water body exceeded the evaluation guideline. The sample value was 22% fines. This LOE and LOEs 31608 and 31609 replace LOE 25689.

Data Reference:

Thompson/Seiad/Grider Ecosystem Analysis. United States Department of Agriculture, Forest Service, Pacific Southwest Region, Klamath National Forest, Happy Camp Ranger District

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Desired Salmonid Freshwater Habitat Conditions for Sediment-Related Indices. State of California North Coast Regional Water Quality Control Board

Spatial Representation:

Samples were collected in West Fork Beaver Creek.

Temporal Representation:

The temporal representation is unknown.

Environmental Conditions:

A major fire occurred in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Samples were collected and analyzed in accordance with the procedures found in the "Stream Condition Inventory (SCI) Technical Guide" (Frazier et al. 2005).

QAPP Information Reference(s):

Stream Condition Inventory Technical Guide. USDA Forest Service, Pacific Southwest Region - Ecosystem Conservation Staff. Vallejo, CA. 111 pp

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25709

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Land use information and location of sources

Data Used to Assess Water Quality:

All 8 of 8 subwatersheds in the Beaver Creek Watershed have road densities that exceed the evaluation guideline. Road densities range from 3.0 to 4.9 miles per square mile. Data are summarized in the "Beaver Creek Environmental Analysis" (USFS 1996).

Data Reference:

Beaver Creek Environmental Analysis. United States Department of Agriculture, Forest Service, Klamath National Forest, Yreka, CA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (North Coast RWQCB 2007): The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per NOAA Fisheries (1996): The guideline for the properly functioning condition for road density and location is less than 2 miles of road per square mile of watershed with no valley bottom roads.

Guideline Reference:

Making Endangered Species Act Determinations of Effect for Individual or Group Actions at the Watershed Scale. Prepared by the National Oceanic and Atmospheric Administration National Marine Fisheries Service Environmental and Technical Services Division Habitat Conservation Branch

Spatial Representation:

The data applies to 9 subwatersheds within the Beaver Creek Watershed. The 8 subwatersheds located in California are Cow Creek, Grouse Creek, Hungry Creek, Bumblebee Creek, Jaynes Canyon, Upper West Fork Creek, Lower West Fork Creek, and Buckhorn Creek subwatersheds. The 1 subwatershed located in Oregon, and therefore not considered in this assessment, is Long John Creek.

Temporal Representation:

The temporal representation of the data is unknown.

Environmental Conditions:

A major fire occurred in the Beaver Creek Watershed in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

Model results were calculated as part of the Equivalent Roaded Area (ERA) Model conducted by staff of the Klamath National Forest in accordance with the procedures described by Elder and Reichert (2004).

QAPP Information Reference(s):

Quantitative Models for Surface Erosion, Mass-wasting and ERA/TOC. CWE 2004. Cumulative Watershed Effects Analysis Process Paper. Klamath National Forest

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25700

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Surveys of fish and game biologists/other professionals

Data Used to Assess Water Quality:

"The Flood of 1997 Klamath National Forest" report (de la Fuente and Elder 1998) states that "[b]ased on observations of fisheries personnel, there appeared to be considerable reduction in size, volume and depth of pools in Elk, Indian, Beaver, Grider, Tompkins, South Fork Salmon, and Walker Creeks, and there is a larger proportion of fine sediment in the substrate. Alluvial reaches were made shallower and wider due to sedimentation." Only Beaver Creek falls within the Iron Gate Dam to Scott River portion of the Middle Klamath River Hydrologic Area.

Data Reference:

The flood of 1997-Klamath National Forest. Phase 1 Final Report. Yreka, CA: Klamath National Forest

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The assessment applies to the Beaver Creek Watershed.

Temporal Representation:

The assessment was made after the flood of December 26, 1996 to January 3, 1997. Findings were made available in November 1998.

Environmental Conditions:

Conditions were a result of the storm of December 26, 1996 to January 3, 1997.

QAPP Information:

The assessment was made by professional staff of the Klamath National Forest.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 28392, Sediment	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25691

Pollutant:

Sediment

LOE Subgroup:

Adverse Biological Responses

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Surveys of fish and game biologists/other professionals

Data Used to Assess Water Quality:

In their conclusions in the Beaver Creek Environmental Analysis (USFS 1996), the Klamath National Forest states that "[t]he riparian and aquatic habitat in Beaver Creek is currently affected by roads in the Riparian Reserves, upslope roads, and other disturbances that cause erosion and stream sedimentation. . . Cumulative watershed impacts have resulted in impaired fish and amphibian habitat quality, mostly excessive fine sediment in streambeds.In their conclusions in the Beaver Creek Environmental Analysis (USFS 1996), the Klamath National Forest states that "[t]he riparian and aquatic habitat in Beaver Creek is currently affected by roads in the Riparian Reserves, upslope roads, and other disturbances that cause erosion and stream sedimentation. . . Cumulative watershed impacts have resulted in impaired fish and amphibian habitat quality, mostly excessive fine sediment in streambeds. The high amount of fines in spawning beds limits egg survival and is a major limiting factor of fish production in the Beaver Creek Watershed.

Data Reference:

Beaver Creek Environmental Analysis. United States Department of Agriculture, Forest Service, Klamath National Forest, Yreka, CA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The assessment applies to the Beaver Creek Watershed.

Temporal Representation:

The assessment was made in July 1996.

Environmental Conditions:

A major fire occurred in the Beaver Creek Watershed in 1987. Major storms occurred in 1964 and 1972.

QAPP Information:

The assessment was made by professional staff of the Klamath National Forest.

QAPP Information Reference(s):


DECISION ID	19875	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Nutrients
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Agriculture \| Drainage/Filling Of Wetlands \| Grazing-Related Sources \| Irrigated Crop Production \| Logging Road Construction/Maintenance \| Road Construction \| Silviculture
TMDL Name:	Klamath River
TMDL Project Code:	97
Date TMDL Approved by USEPA:	12/28/2010
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under sections 2.2 and 4.1 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Five lines of evidence are available in the administrative record to assess this pollutant. It should be noted that this nutrient decision contains Lines of Evidence (LOEs) for ammonia. During the 2010 Integrated Report cycle, ammonia data was evaluated in its own decision, however it is more appropriately evaluated under this broader nutrient decision. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (i.e., sufficient justification to not delist). There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) The Klamath River TMDL confirmed the nutrient impairment and that a nutrient load reduction was necessary to meet water quality standards. (4) The Klamath River TMDL has been approved by the North Coast Regional Water Quality Control Board in March 2010 and approved by USEPA on December 28, 2010. (5) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 19875, Nutrients	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43116

Pollutant:

Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Iron Gate Dam to Scott River to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrite as N.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 19875, Nutrients	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

26295

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 50 ammonia as nitrogen samples collected from the Klamath River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).

Guideline Reference:

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles from 3 sampling locations in the mainstem Klamath River, as follows: (1) below Iron Gate Reservoir (SWAMP Station ID 105KLAMCO), (2) at the Gottville River Access above the confluence with the Shasta River (SWAMP Station ID 105KLARMP), and (3) below Everille Creek (SWAMP Station ID 105KLAEVC).

Temporal Representation:

The samples were collected as grab samples during 51 site visits (17 site visits at each of the 3 sites) during the fiscal years of 2000 to 2005. The site visits corresponded to fall, winter, spring and early summer conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 19875, Nutrients	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34514

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Sample was collected at 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 2/27/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 19875, Nutrients	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43049

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 19875, Nutrients	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

3677

Pollutant:

Nutrients

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):


DECISION ID	30470	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Organic Enrichment/Low Dissolved Oxygen
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Agriculture \| Drainage/Filling Of Wetlands \| Grazing-Related Sources \| Irrigated Crop Production \| Logging Road Construction/Maintenance \| Road Construction \| Silviculture
TMDL Name:	Klamath River
TMDL Project Code:	97
Date TMDL Approved by USEPA:	12/28/2010
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Water Board staff would like to clarify that the intent of the original 1998 303(d) Listing, was to list only the mainstem Klamath River for dissolved oxygen impairment. No additional data or information were evaluated during subsequent 303(d) List cycles (2002, 2006, and 2010), and therefore the Klamath TMDL was developed to address the dissolved oxygen impairment in the mainstem Klamath River, based upon the original extent of the 1998 listing. Therefore, this Decision is considering whether to delist the mainstem Klamath River from Iron Gate Dam to the Scott River from the section 303(d) List for dissolved oxygen impairment. This pollutant is being considered for removal on the section 303(d) list under sections 2.2 and 4.1 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (i.e., sufficient justification to not delist). There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) The Klamath River TMDL confirmed the dissolved oxygen impairment in the mainstem Klamath River from Iron Gate Dam to the Scott River and that a nutrient load reduction was necessary to meet water quality standards. (4) The Klamath River TMDL has been approved by the North Coast Regional Water Quality Control Board in March 2010 and approved by USEPA on December 28, 2010. (5) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the mainstem Klamath River should not be removed from the section 303(d) list for dissolved oxygen because applicable water quality standards for the pollutant are being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 30470, Organic Enrichment/Low Dissolved Oxygen	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

3678

Pollutant:

Organic Enrichment/Low Dissolved Oxygen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 30470, Organic Enrichment/Low Dissolved Oxygen	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33868

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The sample collected did not exceed the objective.

Data Reference:

Statewide Perennial Streams Assessment 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Klamath River from the Scott River to Hoopa is 90% saturation at natural temperatures year-round.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One sample was collected from the Grider Creek station (105PS0043).

Temporal Representation:

One sample was collected in 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 30470, Organic Enrichment/Low Dissolved Oxygen	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34003

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 4 samples exceeded the evaluation guideline.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Klamath River from the Oregon/California state line to the Scott River is 90% saturation at natural temperatures October 1st through March 31st and 85% saturation at natural temperatures April 1st through September 30th.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Table 7.4 of the Staff Report for the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California (NCRWQCB 2010) presents the dissolved oxygen concentrations associated with the dissolved oxygen percent saturation objective. The dissolved oxygen concentrations were calculated utilizing natural temperatures from the Klamath Temperature TMDL model results. Thus, the following dissolved oxygen concentrations reflect natural background dissolved oxygen conditions in the mainstem Klamath River below Iron Gate: 6.5 mg/L in July, 9.7 mg/L in November, 7.8 mg/L in April, and 9.9 mg/L in February.

Guideline Reference:

Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California and the Klamath River and Lost River Implementation Plans

Spatial Representation:

Samples were collected from the 105KLAMCO station.

Temporal Representation:

One sample was collected in 2007 and three samples were collected in 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	20219	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Agriculture \| Drainage/Filling Of Wetlands \| Flow Alteration/Regulation/Modification \| Grazing-Related Sources \| Irrigated Crop Production \| Logging Road Construction/Maintenance \| Removal of Riparian Vegetation \| Road Construction \| Silviculture
TMDL Name:	Klamath River
TMDL Project Code:	97
Date TMDL Approved by USEPA:	12/28/2010
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the Section 303(d) List under Sections 2.2 and 4.2 of the Listing Policy. Under these sections of the Policy, a minimum of one line of evidence is needed to assess listing status. Three lines of evidence are available in the administrative record. The "Klamath River TMDLs Addressing Temperature, Dissolved Oxygen, Nutrient and Microcystin Impairments in California" were approved by the USEPA on December 28, 2010 and thus, this water body-pollutant combination is being addressed with a USEPA approved TMDL. Zero of 4 temperature grab samples from the mainstem Klamath River below Iron Gate dam exceed the evaluation guideline and this sample size is insufficient to determine with the power and confidence of the listing policy if the cold freshwater habitat (COLD) beneficial use is being protected, as a minimum of 26 samples are needed for the application of Table 4.2. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (i.e. sufficient justification to not delist). There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) The Klamath River TMDLs have been approved by the USEPA on December 28, 2010, and the TMDL confirms the temperature impairment. (4) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 3679 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. (5) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 20219, Temperature, water	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

31525

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The following process is utilized to interpret the narrative Temperature Objective in the Basin Plan for impairment assessments. Step 1: determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, Then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No, then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired.

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): Per the Klamath River TMDL, water temperatures in many areas of the Klamath River watershed do not reflect natural conditions (NCRWQCB 2010). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the Klamath watershed (Carter & Kirk 2008). Rearing for all three salmonid species occurs during all months of the year, and spawning occurs September through March for Chinook, October through February for coho, and September through May for steelhead (Carter & Kirk 2008).

Guideline Reference:

Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.

Fish and Fishery Resources of the Klamath River Basin. Appendix 5 of the Klamath River TMDLs.

Spatial Representation:

Information pertains to the following water bodies: Klamath River HU, Middle HA, mainstem Iron Gate Dam to Scott River; Klamath River HU, Middle HA, select tributaries to the Klamath River from Iron Gate Dam to Scott River; Klamath River HU,Middle Klamath River HA, Beaver Creek HSA, Humbug Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Beaver Creek HSA, Beaver Creek and its Tributaries from the confluence of West Fork of Beaver Creek to the mouth (except West Fork Beaver Creek and its Tributaries); Klamath River HU,Middle Klamath River HA, Beaver Creek HSA, Beaver Creek and its Tributaries from headwaters to the confluence with the West Fork of Beaver Creek; Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, West Fork Beaver Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Beaver Creek HSA, McKinney Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Middle Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Horse Creek and its Tributaries from the headwaters to confluence with Middle Creek; and Klamath River HU, Middle Klamath River HA, Hornbrook HSA, Cottonwood Creek and its Tributaries from the headwaters to below the confluence with Mill Creek.

Temporal Representation:

Data are reflective of current conditions in these water bodies.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 20219, Temperature, water	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43238

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body June-August. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies September-May in this water body. See LOE ID 31525 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.

Guideline Reference:

Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 20219, Temperature, water	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

3679

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):


DECISION ID	29335	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Aldrin \| Atrazine \| Azinphos, Ethyl (Ethyl Guthion) \| Azinphos-methyl (Guthion) \| Bolstar \| Carbofuran \| Chlordane \| Chlorothalonil \| Chlorpyrifos \| Chlorpyrifos, methyl \| Ciodrin \| DDD (Dichlorodiphenyldichloroethane) \| DDE (Dichlorodiphenyldichloroethylene) \| DDT (Dichlorodiphenyltrichloroethane) \| Dacthal \| Demeton s \| Diazinon \| Dichlofenthion \| Dichlorvos \| Dieldrin \| Dimethoate \| Dioxathion \| Dyfonate (Fonofos or Fonophos) \| Endosulfan \| Endosulfan sulfate \| Endrin \| Endrin Ketone \| Endrin aldehyde \| Ethion \| Ethoprop \| Famphur \| Fenchlorphos \| Fenitrothion \| Fensulfothion \| Fenthion \| Glyphosate \| Heptachlor \| Heptachlor epoxide \| Hexachlorobenzene/ HCB \| Hexachlorocyclohexane (HCH) \| Hexachlorocyclohexane (HCH), alpha \| Hexachlorocyclohexane (HCH), beta \| Leptophos \| Lindane/gamma Hexachlorocyclohexane (gamma-HCH) \| Malathion \| Merphos \| Methidathion \| Methoxychlor \| Methyl Parathion \| Mevinphos \| Mirex \| Molinate \| Naled \| Nonylphenol \| Oxadiazon \| Oxychlordane \| Parathion \| Phorate \| Phosmet \| Phosphamidon \| Prometon (Prometone) \| Prometryn \| Propazine \| Secbumeton \| Simazine \| Simetryn \| Sulfotep \| Tedion \| Terbufos \| Terbuthylazine \| Terbutryn \| Tetrachlorvinphos \| Thiobencarb/Bolero \| Thionazin \| Tokuthion \| Toxaphene \| Trichlorfon \| Trichloronate \| alpha-Endosulfan (Endosulfan 1) \| beta-BHC (Benzenehexachloride or beta-HCH) \| beta-Endosulfan (Endosulfan 2) \| cis-Nonachlor \| delta-BHC (Benzenehexachloride or delta-HCH) \| o,p'-DDD (Dichlorodiphenyldichloroethane)) \| o,p'-DDE (Dichlorodiphenyldichloroethylene) \| p,p'-DDD (Dichlorodiphenyldichloroethane) \| p,p'-DDE \| p,p'-DDMU \| trans-Nonachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	These pollutants are being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Thirty-six lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use, thirty-one lines of evidence are available to assess protection of the warm freshwater habitat (WARM) beneficial use, thirteen lines of evidence are available to assess protection of the commercial and sport fishing (COMM) beneficial use, and twenty-six lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use. It should be noted that during the 2010 Integrated Report cycle LOE 25595 for Hexachlorocyclohexane (HCH) was evaluated in a separate decision under the name "pesticides". However, for the current Integrated Report cycle, it is included in this multi-pollutant LOE. Per the Listing Policy, data from the following LOEs could not be evaluated because the laboratory data reporting limit(s) were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy: (A) LOEs 40923, 41736, 42306, 42156, and 42213 assessing the COMM beneficial use; (B) LOEs 40903, 33178, 34492, 34493, 34475, 41762, 42331, 42206, and 42272 assessing the MUN beneficial use; (C) LOEs 41472, 41462, 42666, 42732, 42526, and 43020 assessing the COLD beneficial use; (D) LOEs 42615 and 43084 assessing the WARM beneficial use. Zero of 758 water samples exceed the MUN water quality objective. Additionally zero of three water samples for each pollutant exceed the COLD, WARM and COMM objectives, however these sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 758 water samples exceed the MUN water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42578

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Iron Gate Dam to Scott River to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for molinate is 0.6 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42557

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for molinate is 0.6 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42608

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42615

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42666

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The University of California, Davis, chronic criterion for the protection of freshwater aquatic life for malathion is 0.028 ug/L.

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42722

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for methidathion is 0.86 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42732

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The University of California, Davis chronic criterion for the protection of freshwater aquatic life for malathion is 0.028 ug/L.

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42768

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for methidathion is 0.86 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42814

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42828

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42846

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for phorate is 2 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42860

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for phorate is 2 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42880

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometon is 98 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42890

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for phosmet is 5.6 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42918

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometon is 98 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42920

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometryn is 1 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42928

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for phosmet is 5.6 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42972

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometryn is 1 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42974

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for propazine is 1 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43020

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43441

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for simazine is 90 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43380

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for simazine is 90 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43319

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for propazine is 1 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43316

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43208

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for thiobencarb is 1.4 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43192

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43175

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for thiobencarb is 1.4 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43142

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43084

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43033

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42526

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42510

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42495

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42476

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42405

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for HCH, gamma (Lindane or gamma-BHC) to protect aquatic life in freshwater criterion maximum concentration is 0.95 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42398

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42392

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42370

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42344

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42331

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42319

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42306

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42272

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42252

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42213

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42206

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42175

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42156

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42136

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42130

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42087

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42079

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42073

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42051

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42025

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42000

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41994

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41958

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41937

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41925

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41899

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41892

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 55000 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41873

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41854

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 55000 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41838

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41824

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41768

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dimethoate is 43 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41762

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41736

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41729

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41721

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 43 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41689

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for dichlorvos is 7.2 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41658

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41614

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41607

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41591

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41569

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41552

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41537

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41520

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41505

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41493

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41486

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for atrazine is 43 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41472

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41462

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41408

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for atrazine is 43 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41342

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41308

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dacthal 6600 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41300

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for dichlorvos is 7.2 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41254

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dacthal 6600 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41250

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41244

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

40969

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

40949

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

40923

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

40903

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34493

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34492

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00031 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34475

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34474

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criterion continuous concentration for 4,4' DDT. The water body was assessed for the sum of DDT(o,p') and DDT(p,p').

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33315

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criterion continuous concentration for chlordane (total). Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO; Klamath River below Iron Gate

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33178

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria and thus the data were not used in this assessment. Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The total chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO; Klamath River below Iron Gate

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33122

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criteria.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Water Quality Control Plan for the North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. The endosulfan criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L. This value corresponds to the sum of alpha-endosulfan and beta-endosulfan (USEPA National Recommended Water Quality Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

30117

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

709

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 709 pesticides samples collected in the mainstem Klamath River exceed the objective as all of the samples were either measured as non-detect or were measured as detected but not quantified with reporting limits below objectives or evaluation guidelines. The samples were analyzed for 92 pesticides, pesticide constituents, isomers, or metabolites. For each of the 92 pesticide analytes, 7 to 8 samples were collected. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
No evaluation guidelines for the dissolved fractions of the pesticides assessed for this waterbody for the Municipal & Domestic Supply beneficial use could be found that meet the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Hexachlorocyclohexane, alpha (0.0026 ug/l)
Hexachlorocyclohexane, beta (0.0091ug/l)
Aldrin (0.000049 ug/l)
Atrazine (0.001 ug/l)
Carbofuran (0.04 mg/l)
Chlordane (0.0001 ug/l)
Chlorpyrifos (0.083 ug/l)
Dacthal (70 ug/l)
Dieldrin (0.00014 ug/l)
Endrin (0.002 ug/l)
Glyphosate (700 ug/l)
Heptachlor (0.01 ug/l)
Heptachlor epoxide (0.01 ug/l)
Hexachlorobenzene/ HCB (0.001 ug/l)
Lindane/gamma Hexachlorocyclohexane (gamma-HCH) (.98 ug/l)
Methoxychlor (0.03 mg/l)
Molinate (0.02 mg/l)
Simazine (0.04 mg/l)
Thiobencarb/Bolero (0.07 mg/l)
Toxaphene (0.003 mg/l)

Guideline Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles from below Iron Gate Reservoir (SWAMP Station ID 105KLAMCO).

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

29813

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

709

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles from below Iron Gate Reservoir (SWAMP Station ID 105KLAMCO).

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 29335, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25595

Pollutant:

Hexachlorocyclohexane (HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 7 alpha-HCH samples collected in the mainstem Klamath River exceed the evaluation guideline. Sample concentration range from non-detect (with a reporting limit of 0.002 ug/l) to detected at least at 0.002 ug/l but not quantified. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for alpha-hexachlorocyclohexane (HCH) (also listed as alpha-BHC) for the protection of source waters for human health consumption of water and organisms is 0.0026 ug/l.

Guideline Reference:

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles from below Iron Gate Reservoir (SWAMP Station ID 105KLAMCO).

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	22814	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Arsenic \| Boron \| Cadmium \| Chromium \| Chromium (total) \| Copper \| Lead \| Manganese \| Mercury \| Nickel \| Selenium \| Silver \| Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	These pollutants are being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Twelve lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use; two lines of evidence are available to assess the protection of the commercial and sport fishing (COMM) beneficial use; and nine lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use. Zero of 397 metals water samples exceed the MUN water quality objective and zero of 34 metals water samples exceed the COLD water quality objective. Additionally, zero of eight metals water samples exceed the COMM water quality objective, however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 397 metals water samples exceed the MUN water quality objective and zero of 34 metals water samples exceed the COLD water quality objective. These samples do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42793

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32904

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32905

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for lead.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32906

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for nickel.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32907

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for silver.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion maximum concentrations (1-hour average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32908

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for zinc.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34122

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 samples exceeded the objective.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The site specific objective for the mainstem Klamath River HU is a 90% upper limit of 0.3 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 0.2 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Klamath River Below Iron Gate station (105KLAMCO).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41172

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41207

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41400

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

41457

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42278

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42673

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42740

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42777

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43387

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43355

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43326

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43270

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

43130

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

42982

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

21506

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

353

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 353 metals samples collected in the mainstem Klamath River exceed the objectives. There were 10 to 12 samples collected for each of the 10 metal parameters at each of the 3 sites. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Arsenic objective is 0.05 mg/L. Cadmium objective is 0.01 mg/L. Chromium objective is 0.05 mg/L. Lead objective is 0.05 mg/L. Mercury objective is 0.002 mg/L. Selenium objective is 0.01 mg/L. Silver objective is 0.05 mg/L. Per 22 CCR 64431: Nickel maximum contaminant level is 0.1 mg/L. Per 22 CCR 64449: Copper secondary maximum contaminant level is 1.0 mg/L. Zinc secondary maximum contaminant level is 5.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 22814, Multiple Pollutants	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

32887

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for cadmium.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected between 11/15/2007 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	26747	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.2 of the Listing Policy. Under Section 3.2, a single line of evidence is necessary to assess listing status. Two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of 55 samples from the mainstem Klamath River between Iron Gate Dam to the Scott River exceed the objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 26747, Chloride	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34231

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the evaluation guideline.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the Klamath River Below Iron Gate station (105KLAMCO).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 26747, Chloride	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25398

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 51 chloride samples collected in the mainstem Klamath River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	24920	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	PCBs (Polychlorinated biphenyls)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use and one line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use. Zero of 400 water samples exceed the MUN water quality objective. Additionally, zero of two water samples exceed the COLD water quality objective, however this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 400 water samples exceed the MUN water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24920, PCBs (Polychlorinated biphenyls)	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33224

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 2 samples exceeded the criterion continuous concentration for total PCB. The water body was assessed for the 3 aroclors that were contained within the data set and they include aroclor 1248, aroclor 1254, and aroclor 1260.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples collected on 4/9/2008 and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 24920, PCBs (Polychlorinated biphenyls)	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

33223

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 24920, PCBs (Polychlorinated biphenyls)	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25457

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

400

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 400 polychlorinated biphenyl (PCB) analytes collected in the mainstem Klamath River exceed the evaluation guideline. Each of the 8 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007, p. 3-4.00): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in
drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.

Guideline Reference:

Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles below Iron Gate Reservoir (SWAMP Station ID 105KLAMCO).

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	22512	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Specific Conductivity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the Section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of 97 samples from the mainstem Klamath River exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 22512, Specific Conductivity	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34419

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 samples exceeded the objective.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Klamath River below Iron Gate dam in the Middle Klamath HA is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 275 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Klamath River Below Iron Gate station (105KLAMCO).

Temporal Representation:

Samples were collected on the following dates: 11/15/2007 2/27/2008 4/9/2008 7/16/2008

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008).

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 22512, Specific Conductivity	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

21215

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 95 specific conductivity samples collected from the mainstem Klamath River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 350 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 275 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were taken in well-mixed flows in glides or riffles from 6 sampling locations in the mainstem Klamath River, as follows: (1) below Iron Gate Reservoir (SWAMP Station ID KLAMCO), (2) at the Gottville River Access above the confluence with the Shasta River (SWAMP Station ID KLARMP), (3) below Everille Creek (SWAMP Station ID KLAEVC), (4) at Seiad Valley (SWAMP Station ID KLAMSI), (5) at Orleans (SWAMP Station ID KLAMOR), and (5) at Weitchpec above the confluence with the Trinity River (SWAMPT Station ID KLAMWP).

Temporal Representation:

The samples were collected as grab samples during 95 site visits during the fiscal years of 2000 to 2005, including station KLAMOR which had 5 site visits during the 2002 to 2003 fiscal years. The site visits corresponded to fall, winter, spring and early summer conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	24826	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.2 of the Listing Policy. Under Section 3.2, a single line of evidence is necessary to assess listing status. Two lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of 55 samples from the mainstem Klamath River between Iron Gate Dam to the Scott River exceed the objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24826, Sulfates	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34214

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the evaluation guideline.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the Klamath River Below Iron Gate station (105KLAMCO).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 24826, Sulfates	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25520

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 51 sulfate samples collected in the mainstem Klamath River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	32330	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Klamath River exceed the objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal to 5 exceedances of the MUN objective with less than 26 samples is needed for application of Table 3.2. (4) Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 32330, Total Dissolved Solids	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34639

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the recommended level of 500 mg/L.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. For Total Dissolved Solids (TDS), the secondary MCL recommended range is 500 mg/l, the upper range is 1000 mg/l, and the short term range is 1500 mg/l. The recommended range of 500 mg/L was used for the purpose of this assessment.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 105KLAMCO (Klamath River Below Iron Gate).

Temporal Representation:

Samples were collected on 11/15/2007, 4/9/2008, 7/16/2008, and 2/27/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	32329	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a minimum of one line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant in the mainstem Klamath River. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) Zero of four samples from the mainstem Klamath River exceed the objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the MUN objective with less than 26 samples is needed for application of Table 3.2. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 32329, pH	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

34155

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the objective.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 7.0, and the upper limit pH for this water body is 8.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Klamath River Below Iron Gate station (105KLAMCO).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	24517	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Aluminum
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant in the mainstem Klamath River from Iron Gate Dam to the Scott River. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing the mainstem Klamath River from Iron Gate Dam to the Scott River on the section 303(d) list in the Water Quality Limited Segments category for aluminum (i.e., sufficient justification to list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Five of 40 samples exceeded the aluminum objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the mainstem Klamath River from Iron Gate Dam to the Scott River should be placed on the section 303(d) list for aluminum because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 24517, Aluminum	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

47479

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Four of the 36 aluminum samples collected from the mainstem Klamath River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE replaces LOE 25358 from the 2010 Integrated Report cycle. The original LOE was replaced in order to update the numeric objective to the secondary MCL.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 24517, Aluminum	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

40982

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Iron Gate Dam to Scott River to determine beneficial use support and results are as follows: 1 of 4 samples exceed the criterion for Aluminum.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Klamath River HU, Middle HA, Iron Gate Dam to Scott River was collected at 1 monitoring site [ Klamath River Below Iron Gate - 105KLAMCO]

Temporal Representation:

Data was collected over the time period 11/15/2007-7/16/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	25960	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

Pollutant:	Cyanobacteria hepatotoxic microcystins
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2010)
Revision Status	Revised
Sources:	Agriculture \| Grazing-Related Sources \| Habitat Modification \| Irrigated Crop Production \| Logging Road Construction/Maintenance \| Road Construction \| Silviculture
TMDL Name:	Klamath River
TMDL Project Code:	97
Date TMDL Approved by USEPA:	12/28/2010
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Board Conclusion: This pollutant was placed on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for the current Integrated Report cycle. Therefore, the previous conclusion remains unchanged; however, a TMDL has been developed and approved by the USEPA and the approved implementation plan is expected to result in full attainment of the standard within a specified time frame. The previous conclusion is as follows: This decision applies to the mainstem Klamath River in the Klamath River Hydrologic Unit, Middle Klamath River Hydrologic Area, Iron Gate Dam to Scott River reach. This pollutant is being considered for placement on the Section 303(d) List under Section 3.11 of the Listing Policy. Three lines of evidence are available in the administrative record. The LOEs for microcystin toxin in the water column (LOE 25995) and Microcystis cells/ml in the water column (LOE 26055) have evaluation guidelines (WHO 2003) that meet the requirements of the Listing Policy. The LOE for microcystin toxin in tissue (LOE 25846) has an evaluation guideline (Alexeff 2008) that State Water Board staff believes does not meet the requirements of the Listing Policy, due to the fact that the guideline has not been peer-reviewed or published in an official OEHHA agency document. Therefore, only data from LOEs 25995 and 26055 for microcystin and Microcystis in the water column were utilized to assess this pollutant. Data from LOE 25846 on microcystin in tissue are as follows, but were not utilized to assess this pollutant: one out of 4 tissue microcystin toxin samples exceeded the evaluation guideline (Alexeff 2008). Based on the readily available data and information, the situation-specific weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category (i.e., sufficient justification to list). This conclusion is based on the staff findings that: (1) Three of 31 water column microcystin toxin samples (LOE 25995), and 4 of 14 water column Microcystis cell samples (LOE 26055) exceed the evaluation guidelines used to interpret the water quality objective. (2) Any exceedance of the evaluation guidelines indicates non-attainment of standards. In compliance with Section 3.11 of the Listing Policy, a water segment shall be placed on the Section 303(d) List if the weight of evidence indicates non-attainment. (3) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (4) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (5) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains the same. The Regional Board will update this decision when new data and information become available in a future assessment cycle.

State Board Staff Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 25960, Cyanobacteria hepatotoxic microcystins	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25995

Pollutant:

Cyanobacteria hepatotoxic microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the 31 microcystin samples collected in the mainstem Klamath River between the Iron Gate Dam and the Scott River in 2008 exceed the evaluation guideline. Additionally, four of the 31 microcystin samples exceeded the Blue Green Algae Work Group (2008) guideline for microcystin toxin of 8 ug/L to protect the recreational exposure of a child. Microcystin concentrations range from non-detect to 840 ug/L. Samples were collected and summarized by the Karuk Tribe of California (Karuk 2008 - data).

Data Reference:

Cyanobacteria in California Recreational Water Bodies. Providing Voluntary Guidance about Harmful Algal Blooms, Their Monitoring, and Public Notification. Draft. September 2008. Blue Green Algae Work Group of the State Water Resources Control Board, Department of Public Health, and Office of Environmental Health and Hazard Assessment

Karuk Tribe 2008 BGA Data (KR TOX Table 2008). Data for Blue Green Algae in the Klamath River, July 2008 to September 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): All water shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the World Health Organization (WHO 2003): The recommended guideline for microcystin toxin in recreational waters associated with a moderate probability of adverse health effects is 20 ug/L.

Guideline Reference:

World Health Organization. 2003. Guidelines for Safe Recreational Water Environments: Volume 1 Coastal and Freshwaters.

Spatial Representation:

Samples were collected in the mainstem Klamath River at 4 locations as follows: (1) at Brown Bear River Access, (2) at Beaver Creek Fish Disease Site, (3) below Iron Gate Dam, and (4) at Walker Bridge.

Temporal Representation:

Grab samples were collected below Iron Gate Dam between July 10, 2008 and September 17, 2008. Grab samples were collected at Walker Bridge downstream of the town of Klamath River between July 23, 2008 and September 17, 2008. Grab samples were collected at the Beaver Creek Fish Disease Site and Brown Bear River Access on September 2 ,2008.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Samples were collected according to the procedures summarized in the "Draft Klamath River Nutrient, Periphyton, Phytoplankton and Algal Toxin Sampling Analysis Plan" (Karuk 2008-Monitoring Plan).

QAPP Information Reference(s):

Draft Mid-Klamath River Nutrient, Periphyton, Phytoplankton and Algal Toxin Sampling Analysis Plan (SAP). Karuk Tribe of California Water Quality Program.

Line of Evidence (LOE) for Decision ID 25960, Cyanobacteria hepatotoxic microcystins	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

25846

Pollutant:

Cyanobacteria hepatotoxic microcystins

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish whole body

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fish tissue analysis

Data Used to Assess Water Quality:

One of the 4 microcystin samples collected from mussel tissue from the mainstem Klamath River in 2007 exceeds the evaluation guideline. Sample concentrations range from non-detect (with a reporting limit of 1.0 ng/g) to 2,803.10 ng/g. Samples were collected by the California Department of Fish and Game (CDFG) and analyzed for microcystin by the CDFG Fish and Wildlife Water Pollution Control Laboratory in Rancho Cordova, CA. Data are summarized by Kann (2008). The presence of the toxin microcystin in fish and mussels in the Klamath River has the potential to impair the Native American Culture (CUL) and Subsistence Fishing (FISH) beneficial uses, as well as the Commercial and Sport Fishing (COMM) beneficial use listed above.

Data Reference:

Technical Memorandum. Microcystin Bioaccumulation in Klamath River Fish and Freshwater Mussel Tissue: Preliminary 2007 Results. Prepared by Jacob Kann, Ph.D. of Aquatic Ecosystem Sciences LLC. Prepared for Karuk Tribe of California.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (North Coast RWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the California Office of Environmental Health Hazard Assessment (OEHHA) (Alexeeff 2008): The upper bound of the Advisory Tissue Level range for the one serving (8 oz. uncooked fish, 6 oz. cooked, equal to 32 g/day) per week category is 26 ng total microcystins per gram of fish (26 ng/g). This Advisory Tissue Level applies to a composite of 3 or more individual samples of edible tissue.

Guideline Reference:

Letter of August 6, 2008, to Randy Landolt, Managing Director, Pacificorp Energy, from George V. Alexeeff, Ph.D, DABT, Deputy Director for Scientific Affairs, California Office of Environmental Health Hazard Assessment, regarding information related to the occurrence of microcystin in the tissues of Klamath River biota

Spatial Representation:

Mussel samples were collected from the mainstem Klamath River near I-5 and below I-5.

Temporal Representation:

Samples were collected at the near I-5 site on July 11, 2007. Samples were collected at the below I-5 site on November 5, 2007.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Samples were collected and analyzed in accordance with the quality assurance procedures described in the "Technical Memorandum. Microcystin Bioaccumulation in Klamath River Fish and Freshwater Mussel Tissue: Preliminary 2007 Results" (Kann 2008).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 25960, Cyanobacteria hepatotoxic microcystins	Region 1
Klamath River HU, Middle HA, Iron Gate Dam to Scott River

LOE ID:

26055

Pollutant:

Cyanobacteria hepatotoxic microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Four of the 14 Microcystis cell samples collected in 2008 exceed the evaluation guideline. Additionally, four of the 14 samples analyzed for Microcystis cells exceeded the Blue Green Algae Work Group (2008) guideline of 40,000 Microcystis cells/ml if cell populations are dominated by Microcystis and Planktothrix to protect the recreational exposure of a child. Microcystis cell values range from 55 cells/ml to 1,394,139 cells/ml. Samples were collected and summarized by the Karuk Tribe of California (Karuk 2008 - data).

Data Reference:

Karuk Tribe 2008 BGA Data (KR TOX Table 2008). Data for Blue Green Algae in the Klamath River, July 2008 to September 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the World Health Organization (WHO 2003): The recommended guideline for Microcystis cells in recreational waters associated with a moderate probability of adverse health effects is 100,000 cells/ml. This cell count evaluation guideline is a strong indicator of potential toxicity associated with the toxin microcystin.

Guideline Reference:

World Health Organization. 2003. Guidelines for Safe Recreational Water Environments: Volume 1 Coastal and Freshwaters.

Spatial Representation:

Temporal Representation:

Grab samples were collected below Iron Gate Dam between July 10, 2008 and September 17, 2008. Grab samples were collected at Walker Bridge downstream of the town of Klamath River between July 23, 2008 and September 17, 2008. Grab samples were collected at the Beaver Creek Fish Disease site and Brown Bear River Access on September 2, 2008.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Samples were collected according to the procedures summarized in the "Draft Klamath River Nutrient, Periphyton, Phytoplankton and Algal Toxin Sampling Analysis Plan" (Karuk 2008-MonitoringPlan).

QAPP Information Reference(s):

Draft Mid-Klamath River Nutrient, Periphyton, Phytoplankton and Algal Toxin Sampling Analysis Plan (SAP). Karuk Tribe of California Water Quality Program.