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| Title | Colville River Water Quality: Pollutant Loading Capacity and Recommendations for Total Daily Maximum Loads | |||
| Month-Year Published | January 1997 | |||
| Online Availability |
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| Short Description |
The capacity of the Colville River to assimilate pollutant loads from point and nonpoint sources was investigated. (Also see abstract below) | |||
| Publication Number | 96-349 | |||
| Author(s) | Pelletier, G. | |||
| Print Availability | ||||
| Number of pages | 66 pp. + app (136 total) | |||
| Keywords | ammonia, chemical, chemical oxygen demand, colville river, dissolved oxygen, fecal coliform, model, nonpoint, point source, recommendations, river, sediment, stream, TMDL, Total Maximum Daily Load, waste, water, Water Quality | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Colville River Watershed Bacteria Total Maximum Daily Load: Submittal Report - Amended | related publication | |||
| Abstract | Long Description |
The capacity of the Colville River to assimilate pollutant loads from point and nonpoint sources was investigated. Dissolved oxygen downstream from the publicly-owned treatment works (POTWs) operated by the cities of Chewelah and Colville decreases rapidly during summer. The rapid decrease is influenced by sediment oxygen demand, biochemical oxygen demand (BOD), ammonia, and algal respiration. Dissolved oxygen was observed below the 8 mg/L Class A standard at several locations. Ammonia concentrations in the river are highest immediately downstream from the Chewelah and Colville POTWs. Ammonia concentrations decrease proceeding downstream from the POTWs due to algal uptake and nitrification. Fecal coliform concentrations exceed standards over the entire length of the Colville River and in most tributaries. EPA's QUAL2E model was used to simulate dissolved oxygen, ammonia, and fecal coliform in the Colville River. The model was used to determine the potential to violate water quality criteria and recommend waste load allocations for point sources (Colville POTW, Chewelah POTW, and L-Bar). |
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