Draft California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Margarita Glen
Water Body ID:	CAR9022200020190613041212
Water Body Type:	River & Stream


DECISION ID	127722	Region 9
Margarita Glen

Pollutant:	Ammonia
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127722, Ammonia	Region 9
Margarita Glen

LOE ID:

184945

Pollutant:

Nitrogen, ammonia (Total Ammonia)

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127722, Ammonia	Region 9
Margarita Glen

LOE ID:

184946

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	115573	Region 9
Margarita Glen

Pollutant:	Ammonia (Unionized)
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 115573, Ammonia (Unionized)	Region 9
Margarita Glen

LOE ID:

185358

Pollutant:

Ammonia (Unionized)

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 19 samples were collected, 9 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The discharge of wastes shall not cause concentrations of un-ionized ammonia (NH3) to exceed 0.025 mg/l (as N) in inland surface waters, enclosed bays and estuaries and coastal lagoons (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-01-13 to 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 115573, Ammonia (Unionized)	Region 9
Margarita Glen

LOE ID:

185343

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-01-13 to 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114760	Region 9
Margarita Glen

Pollutant:	Iron
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114760, Iron	Region 9
Margarita Glen

LOE ID:

142770

Pollutant:

Iron

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 1 of 8 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life (Water Quality Control Plan for the San Diego Basin).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-07 and 2012-04-19

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114760, Iron	Region 9
Margarita Glen

LOE ID:

142664

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 1 of 7 samples exceeded the water quality threshold for Iron.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2012-04-19

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114760, Iron	Region 9
Margarita Glen

LOE ID:

142809

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-07 and 2012-04-19

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	127822	Region 9
Margarita Glen

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. One of the 18 samples exceed the water quality threshold. 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 CWA 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. One of the 18 samples exceed the water quality threshold and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127822, Nitrogen, Nitrite	Region 9
Margarita Glen

LOE ID:

143816

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114761	Region 9
Margarita Glen

Pollutant:	Oxygen, Dissolved
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114761, Oxygen, Dissolved	Region 9
Margarita Glen

LOE ID:

145071

Pollutant:

Oxygen, Dissolved

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 2 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-07 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114761, Oxygen, Dissolved	Region 9
Margarita Glen

LOE ID:

144783

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-07 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	127419	Region 9
Margarita Glen

Pollutant:	Specific Conductivity
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127419, Specific Conductivity	Region 9
Margarita Glen

LOE ID:

146825

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for specific conductance is 900 uS/cm (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114766	Region 9
Margarita Glen

Pollutant:	Turbidity
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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114766, Turbidity	Region 9
Margarita Glen

LOE ID:

147887

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114766, Turbidity	Region 9
Margarita Glen

LOE ID:

147589

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 3 of 18 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114766, Turbidity	Region 9
Margarita Glen

LOE ID:

147472

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114762	Region 9
Margarita Glen

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:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114762, pH	Region 9
Margarita Glen

LOE ID:

145309

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114762, pH	Region 9
Margarita Glen

LOE ID:

145229

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2017-03-09

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	127239	Region 9
Margarita Glen

Pollutant:	Nitrogen
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Fourteen of the 14 samples exceed the water quality threshold. 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 CWA section 303(d) 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. Fourteen of the 14 samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the 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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127239, Nitrogen	Region 9
Margarita Glen

LOE ID:

144183

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 14 of 14 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Concentrations of nitrogen and phosphorus, by themselves or in combination with other nutrients, shall be maintained at levels below those which stimulate algae and emergent plant growth. A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total P. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 127239, Nitrogen	Region 9
Margarita Glen

LOE ID:

144239

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114763	Region 9
Margarita Glen

Pollutant:	Phosphorus
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Eleven of the 18 samples exceed the threshold. 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 CWA section 303(d) 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. Eleven of 18 samples exceed the threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the 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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114763, Phosphorus	Region 9
Margarita Glen

LOE ID:

145514

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 11 of 18 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114763, Phosphorus	Region 9
Margarita Glen

LOE ID:

145806

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114764	Region 9
Margarita Glen

Pollutant:	Sulfates
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA 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 are available in the administrative record to assess this pollutant. Six of the seven samples exceed the threshold. 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 CWA section 303(d) 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. Six of seven samples exceed the threshold, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114764, Sulfates	Region 9
Margarita Glen

LOE ID:

146713

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 6 of 7 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2012-04-19

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring


DECISION ID	114765	Region 9
Margarita Glen

Pollutant:	Total Dissolved Solids
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA 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. Eighteen of the 18 samples exceed the water quality threshold. 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 CWA section 303(d) 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. Eighteen of 18 samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 114765, Total Dissolved Solids	Region 9
Margarita Glen

LOE ID:

147234

Pollutant:

Total Dissolved Solids

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:

Water Board staff assessed Nutrient TMDL for Santa Margarita Watershed data for Margarita Glen to determine beneficial use support and results are as follows: 18 of 18 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114765, Total Dissolved Solids	Region 9
Margarita Glen

LOE ID:

147047

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114765, Total Dissolved Solids	Region 9
Margarita Glen

LOE ID:

147049

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 114765, Total Dissolved Solids	Region 9
Margarita Glen

LOE ID:

147110

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (MGT01)

Temporal Representation:

The samples were collected between the dates of 2011-01-13 and 2013-03-13

Environmental Conditions:

QAPP Information:

County of San Diego. 2016. Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring.

QAPP Information Reference(s):

Quality Assurance Project Plan for Nutrient Source Reduction Program in the Rainbow Creek Watershed Water Quality Monitoring