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| Title | Snoqualmie River Total Maximum Daily Load Study | |||
| Month-Year Published | May 1994 | |||
| Online Availability |
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| Short Description |
Since 1989, the Washington State Department of Ecology has conducted several water quality investigations on 44.5 miles (71.6 km) of the lower Snoqualmie River basin to define present and potential water quality problems during the summer low flow season. These investigations and water quality simulations, using the model QUAL2E, have resulted in estimating load capacities for biochemical oxygen demand (BOD), ammonia, and fecal coliform during the critical low flow months of August through October. (Also see abstract below) | |||
| Publication Number | 94-71 | |||
| Author(s) | Joy, J. | |||
| Print Availability | ||||
| Number of pages | 42 pp. + app. (64 total) | |||
| Keywords | basin, flow, implementation, model, pH, river, study, Total Maximum Daily Load, waste, water, Water Quality | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Snoqualmie River Basin Fecal Coliform Bacteria, Dissolved Oxygen, Ammonia-Nitrogen, and pH Total Maximum Daily Load: Water Quality Effectiveness Monitoring Report | similar topic | |||
| Abstract | Long Description |
The Snoqualmie is a river system with high water quality and multiple aquatic resources located within 15 miles (24 km) of the Seattle-Bellevue metropolitan area. The Snoqualmie River Valley is undergoing rapid changes in land use with additional waste load discharges projected for the river. Since 1989, the Washington State Department of Ecology has conducted several water quality investigations on 44.5 miles (71.6 km) of the lower river basin to define present and potential water quality problems during the summer low flow season. These investigations and water quality simulations, using the model QUAL2E, have resulted in estimating load capacities for biochemical oxygen demand (BOD), ammonia, and fecal coliform during the critical low flow months of August through October. Additional monitoring is also recommended to develop soluble reactive phosphorus (SRP) loading capacities in the future. The loading capacities will require waste load allocations (WLAs) of BOD and ammonia when the three existing municipal wastewater treatment plants (WWTPs) expand. Implementation of a nonpoint source (NPS) management plan for the mainstem and some tributaries will be necessary immediately to meet Class A fecal coliform criteria, and to meet BOD and ammonia load allocations (LAs). Interim point and nonpoint source SRP monitoring and future water quality-based effluent limits on phosphorus are likely to maintain high quality surface waters. A phased total maximum daily load (TMDL) was recommended to make adjustments to the WLAs/LAs as NPS controls are implemented, and as additional water quality and growth pattern data become available. |
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