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DECISION ID |
16433 |
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| Pollutant: |
Ammonia |
| 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 |
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| Weight of Evidence: |
This pollutant is being considered for placement on the 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 (2) lines of evidence are available in the administrative record to assess this pollutant. Nine (9) of the samples exceed the water quality objective.
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. Nine (9) of sixty-six (66) samples exceed the Basin Plan Objective 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. |
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| 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. |
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| SWRCB Board Decision / Staff Recommendation: |
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| USEPA Decision: |
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| LOE ID: |
28242 |
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| Pollutant: |
Ammonia |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
34 |
| Number of Exceedances: |
1 |
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| Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: |
Of the thirty-four samples taken only one exceeded the standard. |
| Data Reference: |
Orange County Coast Keeper Coastal Watersheds Project |
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| Water Quality Objective/Criterion: |
SARWQCB Basin Plan Objective: For waterbodies designated warm the Standard used varies according to a formula (SARWQCB 2008 Basin Plan Pg 4-7 through 4-9). This standard ranged from 0.19 mg/l to 0.51 mg/l. |
| Objective/Criterion Reference: |
Water Quality Control Plan-Santa Ana Region |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were taken at one station, Wintersberg 1, Located in Santa Ana in the upper part of Wintersburg channel, on Euclid, just north to McFadden Ave. |
| Temporal Representation: |
The samples were collected in 2004 and 2005 sometimes once a month, and sometimes twice a month. |
| Environmental Conditions: |
No environmental conditions have been reported that would affect how this dataset is to be assessed. |
| QAPP Information: |
The data generated by this project is deemed of acceptable quality for assessment purposes because a state approved QAPP was developed per the requirements of the Proposition 13 grant that funded this project. |
| QAPP Information Reference(s): |
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| LOE ID: |
28244 |
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| Pollutant: |
Ammonia |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
32 |
| Number of Exceedances: |
8 |
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| Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: |
Of the 32 samples collected, 8 exceeded the standard |
| Data Reference: |
Orange County Coast Keeper Coastal Watersheds Project |
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| Water Quality Objective/Criterion: |
SARWQCB Basin Plan Objective: For waterbodies designated warm the Standard used varies according to a formula (SARWQCB 2008 Basin Plan Pg 4-7 through 4-9). This standard ranged from 0.19 mg/l to 0.51 mg/l. |
| Objective/Criterion Reference: |
Water Quality Control Plan-Santa Ana Region |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were taken from one station, Wintersberg Channel 2, located in Huntington Beach at the lower part of Wintersburg channel and at the Beach Blvd and Heil intersection. |
| Temporal Representation: |
The samples were collected in 2004 and 2005 sometimes twice a month and sometimes once a month. |
| Environmental Conditions: |
No information on environmental conditions were available that would change the way this data should be assessed. |
| QAPP Information: |
The data generated by this project is deemed of acceptable quality for assessment purposes because a state approved QAPP was developed per the requirements of the Proposition 13 grant that funded this project. |
| QAPP Information Reference(s): |