| Study ID | CCOF0001 |
| Study Name | Lower Yakima River TMDL Sediment Effectiveness Monitoring |
| EIM Data Entry Review Status | Reviewed |
| Study Type | Total Maximum Daily Load (TMDL) effectiveness monitoring |
| Study Purpose | Assessment of the turbidity and suspended sediment within the project area and the effectiveness of the Lower Yakima River Suspended Sediment and DDT TMDL in reducing agriculturally related sediment. This assessment did not include evaluation of DDT pesticide loads. |
| Field Collection Date Range | 4/1/2003 - 10/15/2003 |
| Data First/Last Loaded Date |  |
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| Ecology Program or Other Responsible Entity | Ecy Environmental Assessment Program |
| Ecology Contact | Chris Coffin |
| Ecology Monitoring Program | |
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| Study QA Planning Level | LEVEL 4: Approved QAPP or SAP. |
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| Study QA Assessment Level | Level 5: Data Verified and Assessed for Usability in a Peer-Reviewed Study Report |
| Study Result Description | Sampling during the 2003 irrigation year demonstrated that sediment loads have been reduced in the agricultural drains and river, but improvement is needed to meet all of the targets. Of the four major agricultural drains, three met the criteria for turbidity, while the fourth failed to do so even though it had a sediment load reduction of approximately 80%. Mainstem turbidity requirements at the TMDL compliance point of Kiona Gauge did not meet the state water quality criterion of "5 NTU over background," and neither did the intermediate mainstem sampling sites at Sunnyside-Mabton Road and Euclid Bridge. However, comparing suspended sediment data at the Kiona site collected during 1995 and 2003, both loads and concentrations were greatly reduced in 2003. |
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