| Pollutant: |
Oxygen, Dissolved |
| Final Listing Decision: |
Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
Delist from 303(d) list (TMDL required list)(2018) |
| Revision Status |
Original |
| Reason for Delisting: |
Flaws in original listing |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Regional Board Conclusion: |
LOEs for this waterbody-pollutant combination from previous cycles were reviewed, found to be of insufficient quality to meet the requirements of Listing Policy section 6.1.4, and retired. This resulted in retirement of this decision. |
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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 be removed from the section 303(d) list because the original basis for listing was flawed. |
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| State Board Review of Regional Board Conclusion and Recommendation: |
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| State Board Decision Recommendation: |
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Line of Evidence (LOE) for Decision ID 169470, Oxygen, Dissolved
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Region 1 |
Smith River HU, Elk Creek Watershed |
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| LOE ID: |
357670 |
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| Pollutant: |
Oxygen, Dissolved |
| LOE Subgroup: |
Ancillary Line of Evidence |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Cold Freshwater Habitat |
| Aquatic Life Use: |
Fish Spawning |
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| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: |
Data from previous cycles for this waterbody-pollutant combination were reviewed and found to be of insufficient quality to meet the requirements of section 6.1.4 of the Listing Policy. LOEs 120478, 120483, 120484, 120486, 120487, 120669, 120671, 120674, 120693, 120697 were retired. |
| Data Reference: |
Water quality data for tribal lands submitted through the US EPA STorage and RETrival (STORET) database for the 2018 listing cycle. |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. |
| Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) for the North Coast Region |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
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| Temporal Representation: |
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| Environmental Conditions: |
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| QAPP Information: |
Data from previous cycles for this waterbody-pollutant were not supported by an approved QAPP or did not meet the requirements of Section 6.1.4 of the Listing Policy. These data were deemed to be of insufficient quality to be included in this assessment. |
| QAPP Information Reference(s): |
This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements. |
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