| Pollutant: |
Nitrate |
| Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list)(2010) |
| Revision Status |
Original |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Regional Board Conclusion: |
Region 3 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
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| 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. |
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| State Board Staff Review of Regional Board Conclusion and Recommendation: |
|
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| State Board Decision Recommendation: |
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
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Line of Evidence (LOE) for Decision ID 23613, Nitrate
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Region 3 |
Towne Creek |
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| LOE ID: |
13731 |
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| Pollutant: |
Nitrate |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Municipal & Domestic Supply |
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| Number of Samples: |
21 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed Central Coast Watershed Studies (R3_CCOWS) data for Towne Creek to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Nitrate as N. |
| Data Reference: |
Final Data File used for assessment: CCoWS (Central Coast Watershed Studies) Water Quality Data |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
The Water Quality Control Plan, Central Coast Basin Objective for municipal and domestic supply uses of inland surface waters (Section II.A.2) states the following: waters shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Article 4, Chapter 15, Section 64435, Tables 2 and 3 as listed in Table 3-2. The maximum contaminant level listed in Table 3-2 (inorganic and fluoride concentrations not to be exceeded in domestic or municipal supply) for nitrate is 10.0 mg/L (NO3 as N). |
| Objective/Criterion Reference: |
Title 22, Division 4, Ch. 15, Article 4, Section 64431, Table 64431-A |
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Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3) |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
Data for this line of evidence for Towne Creek was collected at 1 monitoring site [ Small br nr Old Stage Rd] |
| Temporal Representation: |
Data was collected over the time period 1/8/2001-2/19/2001. |
| Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
| QAPP Information: |
Data quality is good and Standard Operating Procedures are well documented in QAPP. However, data documentation is poor and replicate samples and other quality assurance measurements are not consistently documented in this data set. |
| QAPP Information Reference(s): |
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