|
LOE ID: |
15063 |
|
Pollutant: |
Dissolved oxygen saturation |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
|
Number of Samples: |
443 |
Number of Exceedances: |
112 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 112 of 443 samples exceed the criterion for Oxygen, Saturation. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Median values should not fall below 85% saturation as a result of controllable water quality conditions. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306BENJTR - Jetty Road, 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 11/18/1996-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15062 |
|
Pollutant: |
Dissolved oxygen saturation |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Cold Freshwater Habitat |
Aquatic Life Use: |
Cold Freshwater Habitat |
|
Number of Samples: |
443 |
Number of Exceedances: |
112 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 112 of 443 samples exceed the criterion for Oxygen, Saturation. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Median values should not fall below 85% saturation as a result of controllable water quality conditions. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306BENJTR - Jetty Road, 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 11/18/1996-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15308 |
|
Pollutant: |
Oxygen, Dissolved |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Dissolved |
|
Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
|
Number of Samples: |
794 |
Number of Exceedances: |
94 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 94 of 794 samples exceed the criterion for Oxygen, Dissolved. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15307 |
|
Pollutant: |
Oxygen, Dissolved |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Dissolved |
|
Beneficial Use: |
Cold Freshwater Habitat |
Aquatic Life Use: |
Cold Freshwater Habitat |
|
Number of Samples: |
794 |
Number of Exceedances: |
217 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 217 of 794 samples exceed the criterion for Oxygen, Dissolved. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, Cold Water Habitat Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
DECISION ID |
11597 |
|
Pollutant: |
pH |
Final Listing Decision: |
List on 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: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under sections 2.1 and 3.2 of the Listing Policy.
Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.2 the site exceeded numeric objectives for conventional pollutants. According to the binomial distribution, waters shall be placed on the section 303(d) list if the number of measured exceedances supports rejection of the null hypothesis as presented in Table 3.2. 297 out of 856 samples exceed the water quality objectives for Warm and Cold Freshwater Habitat. 402 of 856 samples exceed the water quality objectives for Non-Contact and Water Contact Recreation. These rates of exceedance support rejection of the null hypothesis.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
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. 297 out of 856 samples exceed the water quality objectives for Warm and Cold Freshwater Habitat. 402 of 856 samples exceed the water quality objectives for Non-Contact and Water Contact Recreation. These exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
|
RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
|
SWRCB Board Decision / Staff Recommendation: |
|
|
USEPA Decision: |
|
|
|
Lines of Evidence (LOEs) for Decision ID 11597 |
|
LOE ID: |
15158 |
|
Pollutant: |
pH |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
|
Number of Samples: |
856 |
Number of Exceedances: |
297 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 297 of 856 samples exceed the criterion for pH. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15157 |
|
Pollutant: |
pH |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Non-Contact Recreation |
|
Number of Samples: |
856 |
Number of Exceedances: |
402 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 402 of 856 samples exceed the criterion for pH. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15156 |
|
Pollutant: |
pH |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
856 |
Number of Exceedances: |
402 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 402 of 856 samples exceed the criterion for pH. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
The Water Quality Control Plan, Central Coast Basin objective for water contact recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |
|
|
LOE ID: |
15155 |
|
Pollutant: |
pH |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Cold Freshwater Habitat |
Aquatic Life Use: |
Cold Freshwater Habitat |
|
Number of Samples: |
856 |
Number of Exceedances: |
297 |
|
Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed National Estuarine Research Reserve Monitoring Program (R3_ESNERR) data for Bennett Slough to determine beneficial use support and results are as follows: 297 of 856 samples exceed the criterion for pH. |
Data Reference: |
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Field Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 2006
|
|
Final Data File used for assessment: ESNERR (Elkhorn Slough National Reserve) Water Quality Data from 94-04
|
|
Water Quality Objective/Criterion: |
Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5. |
Objective/Criterion Reference: |
Water Quality Control Plan Central Coast Region (R3) Basin Plan |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Bennett Slough was collected at 5 monitoring sites [ 306MSLSKL - Skipper's Landing, 305BENSTP - GoMoss Landing, 306BENJTR - Jetty Road, 306BENWH1 - Bennett Slough, West, 306BENEH1 - Bennett Slough, East] |
Temporal Representation: |
Data was collected over the time period 1/20/1990-10/10/2006. |
Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
QAPP Information: |
QAPP was adopted for work conducted since 2005. Prior to 2005 no QAPP was in place and data entry was completed by volunteers. Multiple errors were identified in data and were flagged by RB staff (in communication with Elkhorn Slough Program staff) prior to assessment of data. |
QAPP Information Reference(s): |