# Draft 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 3 - Central Coast Region

Water Body Name: | Old Salinas River Estuary
Water Body ID: | CAE3060001419981214143807
Water Body Type: | Estuary

DECISION ID | 5457
Pollutant: | Ammonia (Unionized)
Final Listing Decision: | Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Reason for Delisting: | Flaws in original listing
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. There are two reasons to delist this segment. First, staff has recently segmented this water segment into two segments 1) Old Salinas River, delineated between the Salinas River mouth and Potrero Road and 2) Old Salinas River Estuary, delineated between Potrero Road that Moss Landing Harbor at Sandholdt Road. The data summarized in LOE # 491 is now being assessed for the Old Salinas River segment, in LOE #9581. Second, the calculated unionized ammonia has multiple errors, and three of the exceedances should be removed from the sample count. The unionized ammonia assessment for the Old Salinas River includes the recalculated results from this monitoring location (see LOE # 9581). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: 1. The data used is not applicable to this water segment (Old Salinas River Estuary) and has been re-assessed for the correct water segment (Old Salinas River). 2. The data used in the original assessment for the Old Salinas River Estuary had several incorrect calculated unionized ammonia values, including 3 incorrect exceedances. 3. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff 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 data used is for the wrong water segment (LOE # 491 for Old Salinas River Estuary) and has been re-assessed for the correct segment (LOE#9581 for Old Salinas River).
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5457

LOE ID: | 491
Pollutant: | Ammonia (Unionized)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Estuarine Habitat
Number of Samples: | 48
Number of Exceedances: | 6
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Six out of 48 samples exceeded the general water quality objective (SWAMP, 2004).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | The discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (Region 3 Basin Plan, Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a. General Objectives, page III-4).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from two sites. Exceedances were detected in water samples collected from one (site ID #309OLD) of the two sites.
Temporal Representation: | Samples were collected from March 1999 to March 2003.
Environmental Conditions: | The water body is located in the Salinas hydrologic unit. The sites are located at Old Salinas River at Monterey Dunes Way (309OLD) and Old Salinas River at Potrero Road (309POT).
QAPP Information: | SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 4299
Pollutant: | Fecal Coliform
Final Listing Decision: | Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Reason for Delisting: | Flaws in original listing
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for removal from the section 303(d) list under section 4.3 (Bacteria) of the Listing Policy. Staff recommends removing the fecal coliform listing for this segment because the data summarized in LOE # 490 is assigned to the wrong water segment. Staff has recently segmented this water segment into two segments 1) Old Salinas River, delineated between the Salinas River mouth and Potrero Road and 2) Old Salinas River Estuary, delineated between Potrero Road that Moss Landing Harbor at Sandholdt Road. The data summarized in LOE # 490 is now being assessed for the Old Salinas River segment, in LOE #10703. This data supports the listing of the Old Salinas River segment for Fecal Coliform. In addition, there are flaws in this original data assessment and three field duplicate measurements were included in this assessment. This has been corrected in LOE #10703. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used is for the wrong water segment (LOE # 490 for Old Salinas River Estuary) and has been re-assessed for the correct segment (LOE# 10703 for Old Salinas River) 2. The data used contains three field duplicate values, which have been corrected in the new assessment for the upstream segment (Old Salinas River) in LOE #10703. 3. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff 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 this LOE is assigned to the wrong water segment (Old Salinas River Estuary) and has been re-assessed (in LOE #10703) for the correct segment (Old Salinas River).
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 4299

LOE ID: | 490
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 19
Number of Exceedances: | 6
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | There were nineteen samples with 6 samples exceeding the water quality objective (CCAMP, 2004).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Basin Plan: Fecal coliform concentration, based on minimum of not less than five samples or any 30-day period, shall not exceed a log mean of 200/100 ml, nor shall more than ten percent of the total samples during any 30-day period exceed 400/100 ml.
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | There were 2 sampling stations.
Temporal Representation: | Monthly sampling events. Samples taken from 4/99 to 2/00.
Environmental Conditions: |
QAPP Information: | Central Coast Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 4213
Pollutant: | Low Dissolved Oxygen
Final Listing Decision: | Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Reason for Delisting: | Flaws in original listing
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for removal from the section 303(d) list under section 4.2 (Conventional and Other Pollutants) of the Listing Policy. Staff recommends delisting Old Salinas River Estuary for Low Dissolved Oxygen because the data summarized in LOE # 489 is assigned to the wrong water segment. Staff has recently segmented this water segment into two segments 1) Old Salinas River, delineated between the Salinas River mouth and Potrero Road and 2) Old Salinas River Estuary, delineated between Potrero Road that Moss Landing Harbor at Sandholdt Road. The data summarized in LOE # 489 is now being assessed for the Old Salinas River segment, in LOE #12800. This data supports the listing of the Old Salinas River segment for Low Dissolved Oxygen. 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. This conclusion is based on the staff findings that: 1. The data used is for the wrong water segment (LOE # 489 for Old Salinas River Estuary) and has been re-assessed for the correct segment (LOE# 12800 for Old Salinas River) 2. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff 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 data used is for the wrong water segment (LOE # 489 for Old Salinas River Estuary) and has been re-assessed for the correct segment (LOE# 12800 for Old Salinas River).
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 4213

LOE ID: | 489
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Estuarine Habitat
Number of Samples: | 28
Number of Exceedances: | 11
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Twenty-eight samples with 11 samples exceeding the water quality objectives (CCAMP, 2004).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | COLD: Dissolved oxygen concentration shall not be reduced below 7.0 mg/L at any time. WARM: Dissolved oxygen concentration shall not be reduced below 5.0 mg/L at any time.
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | There were two sampling sites.
Temporal Representation: | Monthly sampling. Samples taken from 3/1/99 to 3/7/00 over 14 sampling dates.
Environmental Conditions: |
QAPP Information: | CCAMP.
QAPP Information Reference(s):

DECISION ID | 6609
Pollutant: | Nutrients
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006)
Revision Status | Original
Sources: | Agriculture | Agriculture-irrigation tailwater | Irrigated Crop Production | Nonpoint Source
Expected TMDL Completion Date: | 2013
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | 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.
RWQCB Board Decision / Staff Recommendation: | No new data were assessed for 2008. The decision has not changed.
SWRCB Board Decision / Staff Recommendation: | N/A
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 6609

LOE ID: | 3974
Pollutant: | Nutrients
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Estuarine Habitat
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference pre-2006 303(d)
Water Quality Objective/Criterion: | Unspecified
Objective/Criterion Reference: | Placeholder reference pre-2006 303(d)
Evaluation Guideline: | Unspecified
Guideline Reference: | Placeholder reference pre-2006 303(d)
Spatial Representation: | Unspecified
Temporal Representation: | Unspecified
Environmental Conditions: | Unspecified
QAPP Information: | Unspecified
QAPP Information Reference(s):

DECISION ID | 6559
Pollutant: | Pesticides
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006)
Revision Status | Original
Sources: | Agricultural Return Flows | Agriculture | Agriculture-irrigation tailwater | Agriculture-storm runoff | Irrigated Crop Production | Nonpoint Source
Expected TMDL Completion Date: | 2013
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | 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.
RWQCB Board Decision / Staff Recommendation: | No new data were assessed for 2008. The decision has not changed.
SWRCB Board Decision / Staff Recommendation: | N/A
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 6559

LOE ID: | 3975
Pollutant: | Pesticides
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Estuarine Habitat
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference pre-2006 303(d)
Water Quality Objective/Criterion: | Unspecified
Objective/Criterion Reference: | Placeholder reference pre-2006 303(d)
Evaluation Guideline: | Unspecified
Guideline Reference: | Placeholder reference pre-2006 303(d)
Spatial Representation: | Unspecified
Temporal Representation: | Unspecified
Environmental Conditions: | Unspecified
QAPP Information: | Unspecified
QAPP Information Reference(s):