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

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa
Water Body ID:	CAR1142100020131010055952
Water Body Type:	River & Stream


DECISION ID	31941	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Nitrogen
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; according to new assessment method
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). Data assessed in the original 2010 decision (Decision 4347) were collected in (1) the mainstem of the Laguna de Santa Rosa, (2) tributaries to the Laguna de Santa Rosa, and (3) the mainstem of Mark West Creek below the confluence with the Laguna de Santa Rosa. The data for tributaries to the Laguna de Santa Rosa are now assessed in the "Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries)" water body and data for the mainstem Mark West Creek are now evaluated in the "Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa" water body. The data for the mainstem of the Laguna de Santa Rosa are evaluated in this decision. LOEs 47084, 47085, 47155, 47410, 47099, 47098, 47103, 47104, 47105, and 47109 are copies of the original 2010 LOEs 1726, 1729, 1739, 8983, 1733, 1732, 1734, 1731, 1730, and 1728 respectively. LOE 47416 is a revision of LOE 1735. Data and information from the following LOEs have been split as follows: (1) LOEs 47082 and 47409 replace LOE 1725; LOEs 47090 and 47173 replace LOE 1718; LOEs 47097, 47413, 47411 and 47412 replace LOE 1717. The original 2010 LOEs were split into two LOEs for the following reasons: (A) in order to assess mainstem Laguna de Santa Rosa data in a separate LOE from data for tributaries to the Laguna de Santa Rosa or (B) in order to assess mainstem Laguna de Santa Rosa data in a separate LOE from data for the mainstem of Mark West Creek. Although there are no new data for this water segment-pollutant combination for the current Integrated Report cycle, the decision information has changed since the 2010 Listing cycle in order to: (1) reflect the decrease in the number of samples resulting from the removal of data for (a) the mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa and (b) tributaries to the Laguna de Santa Rosa to separate decisions, (2) update the MCLs in the LOEs for Nitrate and Nitrite, (3) reflect that there is criteria for ammonia toxicity in the LOEs for Ammonia, and (4) reflect a new assessment methodology for evaluating nitrogen in the Laguna de Santa Rosa as explained in LOE 47416. This pollutant is being considered for removal from the Section 303(d) List under Section 4.11 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Sixteen lines of evidence are available in the administrative record to assess this pollutant. They cover TIN:TP ratio, TIN, Nitrate, Nitrite, Ammonia as nitrogen, and Exotic Vegetation. Many of the LOEs have insufficient information to make determine use support rating. However LOE numbers 47090, 47410 and 47411 indicate that beneficial uses are being fully supported. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the Section 303(d) List in the Water Quality Limited Segments category (i.e., sufficient information to delist). This conclusion is based on the staff findings that: (1) Given the latest science on limiting nutrients (as explained in the evaluation guideline field of LOE 47416) phosphorus is the limiting nutrient and reductions in nitrogen loads beyond current levels are not expected to result in added protection of the beneficial use or significant water quality improvements. The nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus and not nitrogen (Fitzgerald 2013). (2) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (3) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (4) 0 of 593 samples exceeded the objectives for Nitrate and Nitrite and this does not exceed the allowable frequency listed in table 4.1 of the Listing Policy. (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 be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.

State Board Staff Review of Regional Board Conclusion and Recommendation:	This pollutant is being considered for removal from the Section 303(d) List under Section 4.11 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Sixteen lines of evidence are available in the administrative record to assess this pollutant. They cover TIN:TP ratio, TIN, Nitrate, Nitrite, Ammonia as nitrogen, and Exotic Vegetation. Many of the LOEs have insufficient information to make determine use support rating. However LOE numbers 47090, 47410 and 47411 indicate that beneficial uses are being fully supported. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the Section 303(d) List in the Water Quality Limited Segments category (i.e., sufficient information to delist). This conclusion is based on the staff findings that: (1) Given the latest science on limiting nutrients (as explained in the evaluation guideline field of LOE 47416) phosphorus is the limiting nutrient and reductions in nitrogen loads beyond current levels are not expected to result in added protection of the beneficial use or significant water quality improvements. The nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus and not nitrogen (Fitzgerald 2013). (2) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (3) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (4) 0 of 593 samples exceeded the objectives for Nitrate and Nitrite and this does not exceed the allowable frequency listed in table 4.1 of the Listing Policy. (5) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47090

Pollutant:

Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

258

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Eighty-six sampling events were conducted at each of the 3 sites by the RWQCB Nutrient TMDL Monitoring Program. It is assumed that the units of the data submitted were in mg/L. There were no samples that exceeded the 10 mg/L MCL criterion (Scoles, 2004). This LOE and LOE 47173 reconsider data from LOE 1718 from the 2010 Integrated Report cycle. The original LOE has been edited to: (1) reflect that there were 86 site visits are each site, for a total of 258 samples from the three sites considered in this LOE, (2) remove data for Mark West at Trenton Healdsburg Road to a separate LOE, and (3) update the evaluation guideline to the USEPA MCL criteria.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Nitrate is considered in the narrative objective for biostimulatory substances. There is no a nitrate numeric water quality criterion for the Cold Water Beneficial Use. However, for the beneficial use of Municipal and Domestic Supply (MUN), the MCL Criteria for Nitrates is 10 mg/L (ppm) can be considered.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from 3 sample sites: Laguna at Guerneville Road, Laguna at Occidental Road, and Laguna at Stony Point Road.

Temporal Representation:

Samples were collected between 7/1997 and 11/2000.

Environmental Conditions:

QAPP Information:

RWQCB TMDL Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47097

Pollutant:

Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Up to eighty-six sampling events were completed at each site by the RWQCB Nutrient TMDL Program. The nitrite values ranged from 0.025mg/L to 0.28 mg/L. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective/criteria to compare the concentration of nitrite (Scoles, 2004). This LOE and LOE 47413 re-assess data from LOE 1717 from the 2010 Integrated Report cycle under the COLD beneficial use. The LOE was re-done so that data for Mark West Creek at Trenton Healdsburg Road could be assessed in its own, separate LOE.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Nitrite is considered in the narrative objective for biostimulatory substances. However, there is no applicable numeric water quality criterion for nitrite. Therefore, it is difficult to determine that the concentration of nitrite exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from: Laguna at Guerneville Road, Laguna at Occidental Road, and Laguna at Stony Point Road.

Temporal Representation:

Samples were collected between 7/1997 - 11/2000.

Environmental Conditions:

QAPP Information:

Nutrient TMDL Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47098

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Twenty-five sampling events were completed by the City of Santa Rosa NPDES Program. The TIN:TP ratios for the 101 samples taken ranged from 2.5 to 29.1667 with an average value of 4.365 and a standard deviation of 3.282. There was a 99% confidence interval of 0.841. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the TIN:TP ratios. Therefore, it is difficult to determine whether the decrease in dissolved oxygen is due solely to the TIN:TP ratio levels (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Data is recorded as TIN:TP ratio. TIN:TP ratio is considered in the narrative objective for biostimulatory substances. However, there is no numeric water quality objective for TIN:TP ratio. Therefore, it is difficult to determine that the concentration of TIN:TP ratio exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from 4 sampling sites: Laguna at Todd Road, Upstream at Delta, Laguna upstream of D-Pond Incline pump, and Laguna approximately 100 feet upstream of Llano Rd. Bridge.

Temporal Representation:

Samples were collected between 1/2003 and 12/2003.

Environmental Conditions:

QAPP Information:

City of Santa Rosa Quality Assurance Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47099

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Not Recorded

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Sixty sampling events were completed by the City of Santa Rosa NPDES Program. The range of measured values for the ratio of TIN: 0.80 TP was from 0.3 to 16.9. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the concentration of TIN: 0.80 TP (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Data is reported in TIN: 0.80 TP (Bioavailable N:P ratio). TIN: 0.80 TP is considered in the narrative objective for biostimulatory substances. However, there is no numeric water quality objective for TIN: 0.80 TP. Therefore, it is difficult to determine that the concentration of TIN: 0.80 TP exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from 12 sites: Laguna at Llano Road, Laguna at Todd Road, Laguna at Hwy 12, and Laguna at Occidental Bridge, Laguna 100 feet upstream of D-Pond incline Pump, Laguna 150 feet downstream of D-Pond Incline Pump, Laguna at La Franchi, Laguna-approximately 100 feet upstream of Llano Rd. Bridge, Laguna upstream of D-Pond 36, upstream Laguna at Delta, Russian River at Wohler Bridge, Russian River at Mirabel, upstream Roseland Cr. at Llano Rd., downstream Roseland Cr. at Summer Crossing/South of Alpha Bldg., upstream Kelly-downstream confluence of Duer Creek and Kelly Farm Drainage, downstream Duer Creek at Kelly, Colgan Creek upstream confluence with Laguna.

Temporal Representation:

Samples were collected between 10/1995 and 3/2004.

Environmental Conditions:

QAPP Information:

City of Santa Rosa Quality Assurance Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47082

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

There were 86 sampling events completed by the RWQCB TMDL Monitoring Program. The range of values measured was from 0.025 mg/L to 3.24 mg/L. The number of exceedances of the criteria was not calculated, as pH was not available. Data are from Scoles, 2004. This LOE and LOE 47409 reconsider data from 1725 from the 2010 Integrated Report cycle. The original LOE has been edited to: (1) reflect that there is criteria for ammonia in freshwater, however ammonia toxicity could not be calculated due to a lack of pH data and (2) remove data for Mark West at Trenton Healdsburg Road to a separate LOE.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Up to three sample sites: Laguna at Guerneville Road, Laguna at Occidental Road, and Laguna at Stony Point Road.

Temporal Representation:

Samples were collected between 7/1997 and 11/2000.

Environmental Conditions:

QAPP Information:

RWQCB Nutrient TMDL Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47084

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Twenty-five sampling events were conducted by the City of Santa Rosa NPDES Program. The values of the measurements ranged from 0.2 mg/L to 1.1 mg/L. The number of exceedances of the criteria was not calculated, as pH was not available. Data are from Scoles, 2004. This LOE is a copy of LOE 1726 from the 2010 Integrated Report cycle. The original LOE has been edited to reflect that there is criteria for ammonia in freshwater, however ammonia toxicity could not be calculated due to a lack of pH data.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at up to 4 sites: Laguna at Todd Road, Upstream at Delta, Laguna upstream of D-Pond Incline pump, and Laguna upstream of Llano Rd. Bridge.

Temporal Representation:

Samples were collected between 1/2003 and 12/2003.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47085

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Twenty-five sampling events were completed by the City of Santa Rosa NPDES Program. There were 101 samples taken for Ammonia-Nitrogen, the values ranged from 0.2 mg/L to 1.1mg/L. The number of exceedances of the criteria was not calculated, as pH was not available. Data are from Scoles, 2004. This LOE is a copy of LOE 1729 from the 2010 Integrated Report cycle. The original LOE has been edited to reflect that there is criteria for ammonia in freshwater, however ammonia toxicity could not be calculated due to a lack of pH data.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at up to 4 sampling sites: Laguna at Todd Road, Upstream at Delta, Laguna upstream of D-Pond Incline pump, and Laguna upstream of Llano Rd. Bridge.

Temporal Representation:

Samples were collected between 1/2003 and 12/2003.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47079

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

There were sixty sample events from the City of Santa Rosa NPDES Program cited in the report. The measured values of ammonia ranged from 0.1 mg/L to 6.8 mg/L. The number of exceedances of the criteria was not calculated, as pH was not available. Data are from Scoles, 2004. This LOE and LOE 47080 reconsider data from 1727 from the 2010 Integrated Report cycle. The original LOE has been edited to: (1) reflect that there is criteria for ammonia in freshwater, however ammonia toxicity could not be calculated due to a lack of pH data and (2) remove data for tributaries to the Laguna de Santa Rosa to a separate LOE.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from 10 sites: Laguna at Llano Road, Laguna at Todd Road, Laguna at Hwy 12, Laguna at Occidental Bridge, Laguna 100 feet upstream of D-Pond incline Pump, Laguna 150 feet downstream of D-Pond Incline Pump, Laguna at La Franchi, Laguna-approximately 100 feet upstream of Llano Rd. Bridge, Laguna upstream of D-Pond 36, upstream Laguna at Delta, and Laguna @ confluence of Santa Rosa Creek.

Temporal Representation:

Samples were collected between 12/1995 and 3/2004.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47416

Pollutant:

Nitrogen

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:

USEPA provided testimony that nitrogen levels should be compared to nutrient assessment guidelines for the protection of aquatic life (USEPA, 2006). Many values are available and potentially could be used to evaluate Laguna de Santa Rosa nitrogen data. The threshold values ranged from 0.22 to 1.5 mg/L. Data were provided in comments by USEPA (Strauss, 2006). Data were evaluated from two sources (Whickhan and Rawson, 2000 and Scoles, 2006 as referenced in USEPA, 2006). Nitrogen levels are significantly higher than the range of assessment levels provided by USEPA (USEPA, 2006). Approximately 30% of the samples exceeded the thresholds. At least 18 samples exceeded by a factor 10. The nitrogen data reported by Scoles also was expressed in terms of individual nitrogen components, Forty-three percent of the samples exceeded the screening threshold and about 10% of samples exceeded this threshold by a factor or at least 4. However, given the latest science on limiting nutrients (as explained in the evaluation guideline field) Regional Water Board staff conclude that because phosphorus is the limiting nutrient, reductions in nitrogen loads beyond current levels are not expected to result in added protection of the beneficial use or significant water quality improvements. Therefore the nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus and not nitrogen (Fitzgerald 2013).

Data Reference:

Comments on the Draft 2006 section 303(d) list. San Francisco, CA: USEPA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

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

Evaluation Guideline:

To interpret the narrative objective, Regional Water Board staff evaluate available data and information under three distinct categories: biostimulatory stressors, indicators of a biostimulatory response, and stressor-response relationships. Where sufficient site-specific data are available, staff use a combination of research, analysis, and/or modeling to characterize relationships between biostimulatory stressors and observed responses, and if possible, to determine which stressors cause (or control) those responses in a particular water body. Based upon current conditions for the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa, phosphorus is the primary nutrient stressor that limits algal and macrophytic biomass production, and thus causes harmful biostimulatory responses such as decreases in dissolved oxygen levels (Fitzgerald 2013). Because nitrogen can never be completely controlled (since it is available from numerous sources including nitrogen fixing plants and blue green algae) the attempt to limit nitrogen in the Laguna and Mark West Creek is potentially fruitless if it is the sole nutrient being addressed (Butkus 2012a; Wickham and Rawson 2000). Limnologists widely regard phosphate as the predominant limiting nutrient for plant production in freshwater ecosystems, and plant growth can be stopped by limiting phosphate even when other nutrients (including nitrogen) remain abundant (Butkus 2012a; Wickham and Rawson 2000). Preliminary TMDL linkage analysis and modeling results by Butkus (2012b) provide further evidence that total phosphorus concentrations (and not nitrogen) drive algal biomass, and Regional Water Board staff conclude that reductions in total phosphorus, not nitrogen, are needed to reduce algal biomass and thus reduce the biostimulatory response.

Guideline Reference:

2002 303(d) List Update Reference # 21 For Laguna De Santa Rosa

Summary of TMDL Development Data Pertaining To Nutrient Impairments in the Laguna De Santa Rosa Watershed [Revised].

Assessment of Nutrients Limiting Algal Biomass Productin in the Laguna de Santa Rosa.

Laguna de Santa Rosa TMDL Linkage Analysis through the Application of Water Quality Models.

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47103

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Eighty-six sampling events were conducted by the RWQCB Nutrient TMDL Program. The values of the TIN: 0.80 TP recorded ranged from 0.03 up to 20.02. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the measurement of TIN: 0.80 TP (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Four sample sites: Laguna at Guerneville Road, Laguna at Occidental Road, Laguna at Stony Point Road and Laguna at Trenton-Healdsburg Road.

Temporal Representation:

Samples were collected between 7/1997 and 11/2000.

Environmental Conditions:

QAPP Information:

Nutrient TMDL Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47105

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Sixty sampling events were completed by the City of Santa Rosa NPDES Program. The values of the total inorganic nitrogen ranged from 0.3 to 12.2. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the concentration of total inorganic nitrogen (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Total Inorganic Nitrogen was measured and is considered in the narrative objective for biostimulatory substances. However, there is no numeric water quality objective for total inorganic nitrogen. Therefore, it is difficult to determine that the concentration of total inorganic nitrogen exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Temporal Representation:

Samples were collected between 10/1995 and 3/2004.

Environmental Conditions:

QAPP Information:

City of Santa Rosa Quality Assurance Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47104

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Twenty-five sampling events were conducted by the City of Santa Rosa NPDES Program. The samples ranged from values of 0.2 mg/L to 2.3 mg/L total organic nitrogen. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the concentration of total organic nitrogen (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Total Organic Nitrogen was measured and is considered in the narrative objective for biostimulatory substances. However, there is no numeric water quality objective for total organic nitrogen. Therefore, it is difficult to determine that the concentration of total organic nitrogen exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Sample were collected from 4 sites: Laguna at Todd Road, Upstream at Delta, Laguna upstream of D-Pond Incline pump, and Laguna upstream of Llano Rd. Bridge.

Temporal Representation:

Samples were collected between 1/2003 and 12/2003.

Environmental Conditions:

QAPP Information:

City of Santa Rosa Quality Assurance Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47411

Pollutant:

Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

258

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Eighty-six sampling events were conducted at each of the 3 sites by the RWQCB Nutrient TMDL Monitoring Program. It is assumed that the units of the data submitted were in mg/L. The nitrite values ranged from 0.025mg/L to 0.28 mg/L (Scoles, 2004). This LOE and LOE 47412 reconsider data from LOE 1717 from the 2010 Integrated Report cycle under the MUN beneficial use. The original LOE has been edited to: (1) reflect that there were 86 site visits are each site, for a total of 258 samples from the three sites considered in this LOE, (2) remove data for Mark West at Trenton Healdsburg Road to a separate LOE, and (3) update the evaluation guideline to the USEPA MCL criteria.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-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:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from: Laguna at Guerneville Road, Laguna at Occidental Road, and Laguna at Stony Point Road.

Temporal Representation:

Samples were collected between 7/1997 - 11/2000.

Environmental Conditions:

QAPP Information:

Nutrient TMDL Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47109

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Sixty sampling events were conducted by the City of Santa Rosa NPDES Program. The sample values ranged from 0.2 mg/L to 9.7 mg/L and the values were presented as monthly averages of weekly observations. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the concentration of nitrate-nitrogen (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Nitrate-Nitrogen is considered in the narrative objective for biostimulatory substances. However, there is no numeric water quality criterion for nitrate-nitrogen. Therefore, it is difficult to determine that the concentration of nitrate-nitrogen exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from up to 12 sites: Laguna at Llano Road, Laguna at Todd Road, Laguna at Hwy 12, and Laguna at Occidental Bridge, Laguna 100 feet upstream of D-Pond incline Pump, Laguna 150 feet downstream of D-Pond Incline Pump, Laguna at La Franchi, Laguna-approximately 100 feet upstream of Llano Rd. Bridge, Laguna upstream of D-Pond 36, upstream Laguna at Delta, Russian River at Wohler Bridge, Russian River at Mirabel, upstream Roseland Cr. at Llano Rd., downstream Roseland Cr. at Summer Crossing/South of Alpha Bldg., upstream Kelly-downstream confluence of Duer Creek and Kelly Farm Drainage, downstream Duer Creek at Kelly, Colgan Creek upstream confluence with Laguna.

Temporal Representation:

Samples were collected between 10/1995 and 3/2004.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47155

Pollutant:

Exotic Vegetation

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED

Data Used to Assess Water Quality:

Ludwigia hexapetala, an exotic vegetation, is a direct threat to the diversity of native plant and animal communities in the Laguna by growing over surrounding vegetation to produce thick mats of woody perennial stems and decaying plant matter (Sears et al., 2005). This mat inhibits the recovery and recruitment of other plants, and eliminates open-water habitats that are important foraging grounds for bird and other wildlife. As Ludwigia tissue decomposes, microbes reduce dissolved oxygen in water, impacting fish and invertebrate populations. Ludwigia is adapted to low-oxygen (anaerobic) conditions, through specialized root structures that extract oxygen and nutrients from the water column. These root structures also provide a conduit for atmospheric gases to the plant in anaerobic conditions. Along with the ability to tolerate low oxygen levels, Ludwigia appears to grow well in nutrient-rich waters. In general for this species, increased nitrogen and phosphorus concentrations in water result in increased growth and greater plant biomass.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Ludwigia hexapetala covers at least 150 acres of shallow-water areas in the Laguna de Santa Rosa.

Temporal Representation:

Environmental Conditions:

Ludwigia has contributed to a public health threat as it creates protective habitat for mosquitoes that can carry West Nile virus (Sears et al., 2005). This virus reached Sonoma county in 2004. Densely growing Ludwigia inhibits current mosquito control efforts. Several areas with dense stands of Ludwigia produce mosquito populations more than 100 times greater than acceptable levels. The stands of Ludwigia also inhibit the ability to control mosquitoes because dense Ludwigia growth prevents mosquito larvacides from being applied effectively.

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31941, Nitrogen	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47410

Pollutant:

Nitrate

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 77 nitrate as nitrogen samples collected in the Laguna de Santa Rosa exceeded the objective. The sample concentrations range from non-detect (detection limits of 0.02 mg/L - 0.08 mg/L) to 3.2 mg/L. These samples were collected by the Community Clean Water Institutes Volunteer Water Quality Monitoring Program (CCWI 2005, CCWI 2006, CCWI 2007). This LOE replaces LOE 8983 from the 2010 Integrated Report cycle. The MCL has been updated from 45 mg/L to 10 mg/L.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 20011): Waters designated as MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The Nitrate (as N) MCL is 10 mg/L.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from four sites in the Laguna de Santa Rosa from Stony Point Road to the Sebastopol Community Center.

Temporal Representation:

The samples were collected from January 2004 to August 2006

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 in accordance with the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007). At each site a grab sample was collected using a container on a pole or by a bucket attached to a rope. The samples were then put into sterilized Whirl Pak bags, put into coolers on ice, and brought to the lab for analysis.

QAPP Information Reference(s):


DECISION ID	31935	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Nonpoint Source \| Other
Expected TMDL Completion Date:	2016
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). LOEs 47081 and 47083 are exact copies of the original 2010 LOEs 7075 and 7067 respectively. LOE 47596 is new for the 2012 Integrated Report cycle. 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. Two lines of evidence (LOEs 47081 and 47596) are available in the administrative record to assess fecal indicator bacteria in the mainstem Laguna de Santa Rosa. It should be noted that one additional LOE assessing total coliform (LOE 47083) was not utilized in this decision as total coliform are widespread in nature and occur in non-fecal sources such as soil and submerged wood. 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). 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) Detectable levels of non-natural (e.g. human or bovine) pathogen indicator bacteria are in violation of the Basin Plan bacterial Water Quality Objective. Russian River Pathogen Indicator Bacteria TMDL results reflect that both human-host and bovine-host Bacteroides bacteria have been detected in surface waters throughout Russian River Watershed. E. Coli data from the mainstem Laguna de Santa Rosa and Green Valley Creek violate the objective. PhyloChip data results reflect the presence of human host pathogens in the Russian River watershed. Therefore, it is concluded that natural background levels of bacteriological quality are not being achieved in the Russian River watershed and are in violation of the Basin Plan narrative bacteria Water Quality Objective. (3) This process is scientifically defensible and reproducible.

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 31935, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47596

Pollutant:

Escherichia coli (E. coli) | Indicator Bacteria | Pathogens

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Detectable levels of non-natural (e.g. human or bovine) pathogen indicator bacteria are in violation of the Basin Plan bacterial Water Quality Objective. Russian River Pathogen Indicator Bacteria TMDL results reflect that both human-host and bovine-host Bacteroides bacteria have been detected in surface waters throughout Russian River Watershed. E. Coli data from the mainstem Laguna de Santa Rosa and Green Valley Creek violate the objective. PhyloChip data results reflect the presence of human host pathogens in the Russian River watershed. Therefore, it is concluded that natural background levels of bacteriological quality are not being achieved in the Russian River watershed and are in violation of the Basin Plan narrative bacteria Water Quality Objective.

Data Reference:

Evidence of Water Contact Recreation Impairment in the Russian River Watershed.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Russian River watershed, including the Laguna de Santa Rosa watershed.

Temporal Representation:

January 2001 - December 2012

Environmental Conditions:

QAPP Information:

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 31935, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47083

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of 1 total coliform samples collected from the Laguna de Santa Rosa exceeds the evaluation guideline. The sample concentration is 101,120 MPN / 100 ml. The sample was collected by the Community Clean Water Institute (CCWI 2007).

Data Reference:

Community Clean Water Institute Master Data for 2006. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.

Objective/Criterion Reference:

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

Evaluation Guideline:

Per the "Draft Guidance for Fresh Water Beaches" (DHS 2006): Beach posting is recommended when single sample total coliform levels exceed 10,000 MPN / 100 ml. *Note: MPN is the most probable number of coliform units.

Guideline Reference:

Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.

Spatial Representation:

As described by CCWI, the sample was collected from the Laguna de Santa Rosa at the gage station behind the Sebastopol Community Center in Sebastopol. Regional Water Board staff are unaware of any gage in this area of the Laguna de Santa Rosa.

Temporal Representation:

The sample was collected on January 4, 2006.

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:

The sample was collected in accordance with the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007).

QAPP Information Reference(s):

Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods. Updated April 12, 2007

Line of Evidence (LOE) for Decision ID 31935, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47081

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 1 E. coli samples from the Laguna de Santa Rosa exceeds the evaluation guideline. The sample concentration is 23,100 MPN / 100 ml. The sample was collected by the Community Clean Water Institute (CCWI 2006).

Data Reference:

Community Clean Water Institute Master Data for 2005. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.

Objective/Criterion Reference:

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

Evaluation Guideline:

Per the "Draft Guidance for Fresh Water Beaches" (DHS 2006): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml. *Note: MPN is the most probable number of coliform units.

Guideline Reference:

Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.

Spatial Representation:

Temporal Representation:

The sample was collected on January 4, 2006.

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:

The samples were collected in accordance the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007).

QAPP Information Reference(s):

Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods. Updated April 12, 2007


DECISION ID	31936	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

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

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). Data assessed in the original 2010 decision were collected in (1) the mainstem of the Laguna de Santa Rosa and (2) the mainstem of Mark West Creek below the confluence with the Laguna de Santa Rosa. The data for the mainstem Mark West Creek are now evaluated in the "Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa" water body and the data for the mainstem of the Laguna de Santa Rosa are evaluated in this decision. LOE 47086 is a copy of the original 2010 LOE 1738, with the exception that the evaluation guideline has been updated. LOE 47586 evaluated the same data as LOE 47086 utilizing a different assessment method. Although there are no new data for this water segment-pollutant combination for the current Integrated Report cycle, the decision information has changed since the 2010 Listing cycle in order to reflect the decrease in the number of samples resulting from the removal of data for the mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa to a separate decision, and due to a new assessment method being utilized to evaluate mercury in fish tissue as described below. This pollutant is being considered for removal from the Section 303(d) List under Section 4.5 of the Listing Policy. Two lines of evidence are available in the administrative record to assess mercury concentrations in fish fillets. LOE 47586 presents the average of the composite fish tissue samples collected at a single site on the same day in accordance with section 6.1.5 of the Listing Policy. Three of 14 samples exceed the evaluation guideline and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are being met as a minimum of 28 samples are needed for application of Table 4.1. Though the samples were collected from a single location on a single day, fish are not static and move throughout a lake and accumulate mercury in tissue over time. Therefore, the idea of spatial and temporal independence (Section 6.1.5 of the Listing Policy) does not apply. Thus, the same data are also evaluated in LOE 47086 with each composite being evaluated as its own individual sample (the composite sample results are not averaged). When each sample is considered individually, 3 of 17 samples exceeded the evaluation guideline used to interpret the Basin Plan objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are being met as a minimum of 28 samples are needed for application of Table 4.1. 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 in the Water Quality Limited Segments category (i.e., sufficient justification to not de-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, except that composite samples collected at a single location for a single day were evaluated as a single sample and not averaged. (3) Three of 17 samples exceeded the evaluation guideline used to interpret the Basin Plan objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are being met as a minimum of 28 samples are needed for application of Table 4.1. (4) 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:	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 in the Water Quality Limited Segments category (i.e., sufficient justification to not de-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, except that composite samples collected at a single location for a single day were evaluated as a single sample and not averaged. (3) Three of 17 samples exceeded the evaluation guideline used to interpret the Basin Plan objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are being met as a minimum of 28 samples are needed for application of Table 4.1. (4) Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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 31936, Mercury	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47586

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Total

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:

Three out of 14 samples exceeded the evaluation guideline. Sample results collected on the same date and location for a particular species were averaged. Individual and composite filet samples of the following species were collected: black bullhead, bluegill, carp, channel catfish, green sunfish, redear sunfish, Sacramento blackfish, and sucker. Samples were collected from 1996-2000. One 1996 (Stony Point) individual green sunfish sample, one 1999 (Stony Point) composite green sunfish sample, and one 2000 (Occidental Pond) individual bluegill sample exceeded the guideline (TSMP, 2002).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

North Coast RWQCB Basin Plan: 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:

Placeholder reference 2006 303(d)

Evaluation Guideline:

The USEPA 304(a) recommended water quality criterion for concentrations of methylmercury in fish tissue of trophic level 4 fish (150 - 500 mm; fillet wet weight) is 0.20 mg/kg. Total mercury is usually analyzed for most fish studies and assumed to be 100 percent methylmercury for the purposes of risk assessment (Klasing & Brodberg 2008). The fish consumption rate of 32 grams/day is considered more protective of human health since recommendations are now to eat 1 meal a week of fish to obtain necessary Omega 3 nutrition. The fish consumption rate of 32 grams/day is also protective of wildlife, as it protects 6 out of 7 endangered species.

Guideline Reference:

Water Quality Criterion for the Protection of Human Health: Methylmercury. Final. United States Environmental Protection Agency Office of Science and Technology Office of Water. EPA-823-R-01-001. January 2001

Spatial Representation:

Three stations were sampled: upstream of Occidental Road (Occidental Pond), adjacent to the sewage treatment plant in Sebastopol (Sebastopol Pond), and Laguna de Santa Rosa at Stony Point Road (Stony Point).

Temporal Representation:

Samples were collected 1996-2000.

Environmental Conditions:

QAPP Information:

Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 1996-2000, Department of Fish and Game.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31936, Mercury	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47086

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Total

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:

Three out of 17 samples exceeded the evaluation guideline. Individual and composite filet samples of the following species were collected: black bullhead, bluegill, carp, channel catfish, green sunfish, redear sunfish, Sacramento blackfish, and sucker. Composite samples consisted of 1-10 fish depending on species. Samples were collected from 1996-2000. One 1996 (Stony Point) individual green sunfish sample, one 1999 (Stony Point) composite green sunfish sample, and one 2000 (Occidental Pond) individual bluegill sample exceeded the guideline (TSMP, 2002).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples were collected 1996-2000.

Environmental Conditions:

QAPP Information:

Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 1996-2000, Department of Fish and Game.

QAPP Information Reference(s):


DECISION ID	31937	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Source Unknown
Expected TMDL Completion Date:	2017
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). LOEs 47092 and 47095 are exact copies of the original 2010 LOEs 1736 and 8982 respectively. LOEs 47089 and 47176 replace LOE 1719 from the 2010 Integrated Report cycle. Data from the original LOE were split into two LOEs in order to assess mainstem Laguna de Santa Rosa data in a separate LOE from data for tributaries to the Laguna de Santa Rosa. LOE 47089 is assessed under this water body, and LOE 47176 is assessed under the "Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries)" water body. Although there are no new data for this water segment-pollutant combination for the current Integrated Report cycle, the decision information has changed since the 2010 Listing cycle, resulting from the removal of data for the tributaries to the Laguna de Santa Rosa to a separate decision. This pollutant is being considered for removal from the Section 303(d) list under Section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary 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 in the Water Quality Limited Segments category (i.e., sufficient information to not de-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) There are 1,580 out of 1,697 dissolved oxygen samples that exceed the water quality objective, and this exceeds the allowable frequency of 282 exceedances per the binomial distribution described in Section 4.2 of the Listing Policy. (4) 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 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 31937, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47089

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1595

Number of Exceedances:

1519

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

A total of 1519 of the 1595 samples violated the water quality objective. This LOE and LOE 47176 replace LOE 1719.

Data Reference:

2002 303(d) List Update Reference # 65 For Laguna De Santa Rosa

2002 303(d) List Update Reference # 108 For Laguna De Santa Rosa

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The minimum dissolved oxygen objective is 7.0 mg/L. The 90% lower limit dissolved oxygen objective is 7.5 mg/L. The 50% lower limit dissolved oxygen objective is 10.0 mg/L. The 90% and 50% lower limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be greater than or equal to the lower limit.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected at 3 points along the mainstem Laguna de Santa Rosa at Guerneville Road (LGR), Occidental Road (LOR), and Stony Point Road (LSP).

Temporal Representation:

The data were collected over 5 to 6 years between 1995 and 2001 over 4 seasons

Environmental Conditions:

QAPP Information:

Data came from the NCRWQCB 2002 Listing Update.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31937, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47092

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

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:

At sampling station LAG030 5 out of 9 samples were below the minimum 7.0 mg/L objective, this sampling locations samples were in exceedance Upper Limit 50% and Upper Limit 90% objectives as well. At sampling station LAG040 1 out of 2 samples were below the minimum 7.0 mg/L objective. At sampling station LTL010 1 out of 2 samples were below the minimum 7.0 mg/L objective. At sampling station LAG050 the only sample was below the minimum 7.0 mg/L objective (Sandler, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Dissolved oxygen- is 7.0mg/L as a minimum; and the water must meet the 50% Upper Limit of 10 mg/L and 90% Upper Limit of 7.5 mg/L.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

There are 5 sampling locations for Laguna de Santa Rosa. Sampling station LAG030 is located at Permanent gage behind Community Center in Sebastopol. Sampling station LAG040 is located at By bridge at Todd Rd. South of Sebastopol. Sampling station LTL010 is located at North of LAG050 on Llano Rd., by bridge. Sampling station LAG050 is located at By bridge at Llano Road south of Sebastopol.

Temporal Representation:

Sampling station LAG030 was sampled once a month, with one measurement for that day of the month during 2003, with no samples collected for May, July and September. Sampling station LAG040 was sampled once in June and once in August 2003. Sampling station LTL010 was sampled once in June and once in August 2003. Sampling station LAG050 was sampled once in June 2003.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31937, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47095

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

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

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Fifty-four of the 93 samples collected in the Laguna de Santa Rosa exceeded the minimum DO water quality objective. The DO values ranged from 0.8 mg/L to 17.6 mg/L. These samples were collected by the Community Clean Water Institutes Volunteer Water Quality Monitoring Program (CCWI 2005, CCWI 2006, CCWI 2007).

Data Reference:

Community Clean Water Institute Master Data for 2005. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2006. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2004. Downloaded from http://ccwi.org/issues/data.htm on October 1, 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The minimum dissolved oxygen objective is 7.0 mg/l. The 90% lower limit dissolved oxygen objective is 7.5 mg/l. The 50% lower limit dissolved oxygen objective is 10.0 mg/l. The 90% and 50% lower 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 lower limit.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from four sites in the Laguna de Santa Rosa from Stony Point Road to the Sebastopol Community Center.

Temporal Representation:

The DO samples were collected from January 2004 to December 2006. The DO samples were collected as instantaneous values and do not represent diurnal 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:

Samples were collected in accordance with the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007).

QAPP Information Reference(s):

Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods. Updated April 12, 2007


DECISION ID	31947	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Phosphorus
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Source Unknown
Expected TMDL Completion Date:	2017
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). Data assessed in the original 2010 decision (Decision 4505) were collected in (1) the mainstem of the Laguna de Santa Rosa, (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries), and (3) the mainstem of Mark West Creek below the confluence with the Laguna de Santa Rosa. The data for tributaries to the Laguna de Santa Rosa are now assessed in the "Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries)" water body and data for the mainstem Mark West Creek are now evaluated in the "Russian River HU, Middle Russian River HA, Mark West HSA, mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa" water body. The data for the mainstem of the Laguna de Santa Rosa are evaluated in this decision. LOEs 47155, 47159, and 47163 are copies of the original 2010 LOEs 1739, 9037, 1722 respectively. Data and information from the following LOEs have been split as follows: (1) LOEs 47423 and 47424 replace LOE 1724; 47161 and 47178 replace LOE 1723; 47418 and 47422 replace LOE 1720; and 47420 and 47421 replace LOE 1721. The original 2010 LOEs were split into two LOEs for the following reasons: (A) in order to assess mainstem Laguna de Santa Rosa data in a separate LOE from data for tributaries to the Laguna de Santa Rosa or (B) in order to assess mainstem Laguna de Santa Rosa data in a separate LOE from data for the mainstem of Mark West Creek. Although there are no new data for this water segment-pollutant combination for the current Integrated Report cycle, the decision information has changed since the 2010 Listing cycle in order to: (1) reflect the decrease in the number of samples resulting from the removal of data for (a) the mainstem Mark West Creek downstream of the confluence with the Laguna de Santa Rosa and (b) tributaries to the Laguna de Santa Rosa to separate decisions, and (2) reflect a new assessment methodology for evaluating phosphorus in the Laguna de Santa Rosa as explained in LOE 47423. This pollutant is being considered for removal from the Section 303(d) List under Section 4.11 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Seven 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 in the Water Quality Limited Segments category (i.e., sufficient justification to not de-list). This conclusion is based on the staff findings that: (1) While no numeric water quality objective is available for phosphorus, USEPA provided guidelines that were used to assess the magnitude of the observed phosphorus concentrations. (2) Assessment of phosphorus measurements show that many measurements are an order of magnitude higher than the USEPA-provided thresholds. (3) The Laguna is infested with exotic aquatic vegetation (Ludwigia) that thrives in oxygen poor, nutrient rich waters. This plant prevents effective mosquito control efforts. (4) The nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus (Fitzgerald 2013). Preliminary TMDL linkage analysis and modeling results by Butkus (2012b) provide evidence that total phosphorus concentrations drive algal biomass, and Regional Water Board staff conclude that reductions in total phosphorus are needed to reduce algal biomass and thus reduce the biostimulatory response. (5) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (6) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy.

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:	This pollutant is being considered for removal from the Section 303(d) List under Section 4.11 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Seven 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 in the Water Quality Limited Segments category (i.e., sufficient justification to not de-list). This conclusion is based on the staff findings that: (1) While no numeric water quality objective is available for phosphorus, USEPA provided guidelines that were used to assess the magnitude of the observed phosphorus concentrations. (2) Assessment of phosphorus measurements show that many measurements are an order of magnitude higher than the USEPA-provided thresholds. (3) The Laguna is infested with exotic aquatic vegetation (Ludwigia) that thrives in oxygen poor, nutrient rich waters. This plant prevents effective mosquito control efforts. (4) The nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus (Fitzgerald 2013). Preliminary TMDL linkage analysis and modeling results by Butkus (2012b) provide evidence that total phosphorus concentrations drive algal biomass, and Regional Water Board staff conclude that reductions in total phosphorus are needed to reduce algal biomass and thus reduce the biostimulatory response. (5) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (6) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy.

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 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47423

Pollutant:

Phosphorus

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:

USEPA provided testimony that phosphorus levels should be compared to nutrient assessment guidelines for the protection of aquatic life (USEPA, 2006). These values range from 0.010 to 0.2 mg/L. Data were provided in comments by USEPA (USEPA, 2006). Data were evaluated from two sources (Whickhan and Rawson, 2000 and Scoles, 2006 as referenced in USEPA, 2006). Total phosphorus data were presented in both sources and were compared to the guideline levels from USEPA. Approximately 95% of phosphorus measurements exceeded the least conservative screening threshold. Approximately 20% of measurements exceeded the 0.1 mg/L threshold by a factor of 10. Given the latest science on limiting nutrients (as explained in the evaluation guideline field) Regional Water Board staff conclude that phosphorus is the limiting nutrient in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa. Therefore the nutrient driving biostimulatory conditions in the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa is phosphorus (Fitzgerald 2013). Preliminary TMDL linkage analysis and modeling results by Butkus (2012b) provide further evidence that total phosphorus concentrations (and not nitrogen) drive algal biomass, and Regional Water Board staff conclude that reductions in total phosphorus, not nitrogen, are needed to reduce algal biomass and thus reduce the biostimulatory response.

Data Reference:

Comments on the Draft 2006 section 303(d) list. San Francisco, CA: USEPA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

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

Evaluation Guideline:

To interpret the narrative objective, Regional Water Board staff evaluate available data and information under three distinct categories: biostimulatory stressors, indicators of a biostimulatory response, and stressor-response relationships. Where sufficient site-specific data are available, staff use a combination of research, analysis, and/or modeling to characterize relationships between biostimulatory stressors and observed responses, and if possible, to determine which stressors cause (or control) those responses in a particular water body. Based upon current conditions for the mainstem Laguna de Santa Rosa and mainstem Mark West Creek below the confluence with the Laguna de Santa Rosa, phosphorus is the primary nutrient stressor that limits algal and macrophytic biomass production, and thus causes harmful biostimulatory responses such as decreases in dissolved oxygen levels (Fitzgerald 2013). Limnologists widely regard phosphate as the predominant limiting nutrient for plant production in freshwater ecosystems, and plant growth can be stopped by limiting phosphate even when other nutrients (including nitrogen) remain abundant (Butkus 2012a; Wickham and Rawson 2000). Preliminary TMDL linkage analysis and modeling results by Butkus (2012b) provide further evidence that total phosphorus concentrations (and not nitrogen) drive algal biomass, and Regional Water Board staff conclude that reductions in total phosphorus, not nitrogen, are needed to reduce algal biomass and thus reduce the biostimulatory response.

Guideline Reference:

2002 303(d) List Update Reference # 21 For Laguna De Santa Rosa

Summary of TMDL Development Data Pertaining To Nutrient Impairments in the Laguna De Santa Rosa Watershed [Revised].

Assessment of Nutrients Limiting Algal Biomass Productin in the Laguna de Santa Rosa.

Laguna de Santa Rosa TMDL Linkage Analysis through the Application of Water Quality Models.

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47155

Pollutant:

Exotic Vegetation

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED

Data Used to Assess Water Quality:

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Ludwigia hexapetala covers at least 150 acres of shallow-water areas in the Laguna de Santa Rosa.

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47418

Pollutant:

Phosphorus

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:

There were up to 86 sampling events conducted by the RWQCB TMDL Monitoring Program at these sampling sites between 7/1997 and 11/2000. The data range for values of total phosphorus was between 0.113 mg/L and 2.98 mg/L. Even though there is a narrative objective for biostimulatory substance, there is not a numeric objective or criteria to compare to the concentration of total phosphorus measured (Scoles, 2004). This LOE and LOE 47422 reconsider data from LOE 1720 from the 2010 Integrated Report cycle. The original LOE has been edited to remove data for Mark West at Trenton Healdsburg Road to a separate LOE.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Phosphorus is considered in the narrative objective for biostimulatory substances. A numeric water quality objective is not available so it is difficult to determine whether the concentration of total phosphorus exceeded standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected from 3 sample sites: Laguna at Guerneville Road, Laguna at Occidental Road, and Laguna at Stony Point Road.

Temporal Representation:

Samples were collected between 7/1997 and 11/2000.

Environmental Conditions:

QAPP Information:

Nutrient TMDL Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47163

Pollutant:

Phosphorus

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:

Twenty-five sampling events were completed by the City of Santa Rosa NPDES at up to 5 sample sites between 1/2003 and 12/2003. The range of values for total phosphorus measured was between 0.4 mg/L and 1.6 mg/L. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare to the concentration of total phosphorus (Scoles, 2004).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Samples were collected at 4 sites: Laguna at Todd Road, upstream at Delta, Laguna upstream of D-Pond Incline pump, and Laguna upstream of Llano Rd. Bridge.

Temporal Representation:

Samples were collected between 1/2003 and 12/2003.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47420

Pollutant:

Phosphorus

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:

There were sixty sampling events completed by the City of Santa Rosa NPDES Program at up to 10 sample sites between 12/1995 and 3/2004. The data range for values of total phosphorus was between 0.1 mg/L and 3.9 mg/L. Even though there is a narrative objective for biostimulatory substance, there is not a numeric objective or criteria to compare to the concentration of total phosphorus measured (Scoles, 2004). This LOE and LOE 47421 reconsider data from LOE 1721 from the 2010 Integrated Report cycle. The original LOE has been edited to remove data for tributaries to the Laguna de Santa Rosa to a separate LOE.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Temporal Representation:

Samples were collected between 12/1995 and 3/2004.

Environmental Conditions:

QAPP Information:

City of Santa Rosa QA Manual.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47159

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

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

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

It is unknown whether any of the 73 phosphorus samples collected in the Laguna de Santa Rosa exceed the objective as there is insufficient information available to determine exceedance. Specifically, the samples cannot be compared to the objective because diel samples for dissolved oxygen (DO), pH, and/or chlorophyll-a are not available. Nutrients, such as phosphorus, alone do not impair beneficial uses or cause non-attainment of the objective. Rather, they cause indirect impacts through algal growth and extreme diel patterns for DO and pH, which then impair uses. Waterbody-specific factors such as riparian cover, flow conditions, and stream channel configuration also affect how nutrients are processed within the stream and play a large role in determining whether or not nuisance algal conditions will prevail. For these reasons, comparing a single nutrient value to the biostimulatory objective is not recommended. Instead, nutrient-related indicator parameters, such as diel measurements of DO, pH, and/or chlorophyll-a, should be evaluated to determine attainment of the objective and protection of beneficial uses. When nutrient-related indicator parameters exceed targets, nutrient concentrations will then be analyzed to determine whether phosphorus should be added to a possible listing under the 303(d) List. The sample concentrations range from non-detect (reporting limits of 0.03 mg/L and 0.1 mg/L) to 1.67 mg/L. These samples were collected by the Community Clean Water Institutes Volunteer Water Quality Monitoring Program (CCWI 2005, CCWI 2006, and CCWI 2007).

Data Reference:

Community Clean Water Institute Master Data for 2005. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2006. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2004. Downloaded from http://ccwi.org/issues/data.htm on October 1, 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from four sites in the Laguna de Santa Rosa from Stony Point Road to the Sebastopol Community Center.

Temporal Representation:

The samples were collected from January 2004 to July 2006.

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 in accordance with the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007).

QAPP Information Reference(s):

Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods. Updated April 12, 2007

Line of Evidence (LOE) for Decision ID 31947, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47161

Pollutant:

Phosphorus

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:

Eighty-six sampling events were conducted by the RWQCB TMDL Program. The range of values of 80% TP was between 0.02 and 2.38. Even though there is a narrative objective for biostimulatory substance there is not a numeric objective or criteria to compare the concentration of 80% TP. Therefore, it is difficult to determine whether the decrease in dissolved oxygen is solely due to the 80% TP (SWRCB, 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Water shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Data reported in 80% TP (total phosphorus). 80% TP is considered in the narrative objective for biostimulatory substances. There is no numeric water quality objective for 80% TP. Therefore, it is difficult to determine that the concentration of nitrate-nitrogen exceeds standards.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Three to four sample sites (Laguna at Guerneville Road, Laguna at Occidental Road, Laguna at Stony Point Road and Laguna at Trenton-Healdsburg Road.

Temporal Representation:

Samples were collected between 7/1997 and 11/2000.

Environmental Conditions:

QAPP Information:

NCRWQCB Nutrient TMDL Program.

QAPP Information Reference(s):


DECISION ID	31939	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). LOE 47100 is a copy of LOE 4767 from the 2010 Integrated Report cycle. LOE 47107 is a copy of LOE 1737 from the 2010 Integrated Report cycle, however the original LOE information has been edited to reflect that here is not an appropriate evaluation guideline for turbidity. This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section 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. 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). 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) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 47100 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. (4) 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 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 31939, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47107

Pollutant:

Turbidity

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:

At the present time, natural background turbidity levels have not been determined for this watershed, and exceedence probabilities (the turbidity, associated with flow, that is exceeded X% of the time) have not been calculated. Thus, there is currently no appropriate evaluation guideline for this watershed, and no way to determine whether the objective is being exceeded. This LOE replaces LOE 1737 which utilized an evaluation guideline that was determined to be inappropriate by the Intagrated Report Roundtable comprised of State and Regional Water Board staff members.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Turbidity shall not be increased more than 20 percent above naturally occurring background levels. Allowable zones of dilution within which higher percentages can be tolerated may be defined for specific discharges upon the issuance of discharge permits or waiver thereof.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

There were 4 sampling locations for Laguna de Santa Rosa. Sampling station LAG030 is located at permanent gauge behind Community Center in Sebastopol. Sampling station LAG040 is located by bridge at Todd Rd. South of Sebastopol. Sampling station LTL010 is located north of LAG050 on Llano Rd., by bridge. Sampling station LAG050 is located by bridge at Llano Road south of Sebastopol.

Temporal Representation:

Sampling station LAG030 was sampled once a month for ten months in 2003, no samples were taken in May and September. Sampling station LAG040, LAG050, and LTL010 were sampled once a month in June and August 2003.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 31939, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47100

Pollutant:

Sedimentation/Siltation

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:

Temporal Representation:

Environmental Conditions:

QAPP Information:

unspecified

QAPP Information Reference(s):


DECISION ID	31945	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

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:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). LOE 47113 is a copy of LOE 8981 from the 2010 Integrated Report cycle. Although there are no new data for this water segment-pollutant combination for the current Integrated Report cycle, the decision information has changed since the 2010 Listing cycle in order to reflect the decrease in the number of samples resulting from the removal of data for tributaries to the Laguna de Santa Rosa to a separate decision. 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. 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) Two of the 102 pH samples exceed the water quality objective, and this does not exceed the allowable frequency of 17 per the binomial distribution described in Section 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 31945, pH	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47113

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

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

Number of Samples:

102

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Two of the 102 samples for pH collected in the Laguna de Santa Rosa exceeded the pH water quality objective. The pH values ranged from 7.0 to 9.6. These samples were collected by the Community Clean Water Institutes Volunteer Water Quality Monitoring Program (CCWI 2005, CCWI 2006, CCWI 2007).

Data Reference:

Community Clean Water Institute Master Data for 2005. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2006. Downloaded from http://ccwi.org/issues/data.htm on August 25, 2008

Community Clean Water Institute Master Data for 2004. Downloaded from http://ccwi.org/issues/data.htm on October 1, 2008

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The maximum pH objective is 8.5. The minimum pH objective is 6.5.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from four sites in the Laguna de Santa Rosa from Stony Point Road to the Sebastopol Community Center.

Temporal Representation:

The pH samples were collected during 102 site visits from January 2004 to December 2006. The pH samples were collected as instantaneous measurements and do not represent diurnal 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:

Samples were collected in accordance with the "Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods" (CCWI 2007).

QAPP Information Reference(s):

Community Clean Water Institute Volunteer Water Quality Monitoring Program Sampling and Analysis Methods. Updated April 12, 2007


DECISION ID	31944	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

Pollutant:	Temperature, water
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Data included in this decision were originally assessed under the "Russian River HU, Middle Russian River HA, Laguna de Santa Rosa" water body, which has been split into two water bodies for the current Integrated Report cycle: (1) Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa and (2) Russian River HU, Middle Russian River HA, Laguna HSA, tributaries to the Laguna de Santa Rosa (except Santa Rosa Creek and its tributaries). LOE 47111 is a copy of placeholder LOE 4768 from the 2010 Integrated Report cycle. Regional Water Board conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

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 31944, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Laguna HSA, mainstem Laguna de Santa Rosa

LOE ID:

47111

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:

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:

Temporal Representation:

Environmental Conditions:

QAPP Information:

unspecified

QAPP Information Reference(s):