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| Title | Colville Wastewater Treatment Plant/Colville River Receiving Water Study. | |||
| Month-Year Published | April 1989 | |||
| Online Availability |
1478 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
A receiving water study was conducted in the Colville River to evaluate the influence of the Colville Wastewater Treatment Plant (WTP) on water quality. (Also see abstract below) | |||
| Publication Number | 89-e39 | |||
| Author(s) | Pelletier, G. | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 29 pp. | |||
| Keywords | colville river, flow, receiving water, reduction, river, study, treatment, waste, wastewater, wastewater treatment plant, water | |||
| Subject Waterbodies |
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| Abstract | Long Description |
A receiving water study was conducted in the Colville River to evaluate the influence of the Colville Wastewater Treatment Plant (WTP) on water quality. The zone of effluent dilution was observed to occur over a relatively long distance (>300 feet) relative to Ecology guidelines. Potential dilution of the permitted discharge at 7-day, 10-year (7Q10) low river flow is less than Ecology guidelines (9:1 versus 100:1 guideline.) Although the plant is presently not discharging at permit capacity, the existing permit loadings are expected to result in dissolved oxygen sags below the Class A standard and residual chlorine elevations above the chronic and acute aquatic life criteria at 7Q10 low river flow. Reduction in permitted loadings of BOD and residual chlorine are recommended at river flows less than 79 cfs, the 120-day, 2-year (120Q2) low flow, which generally occurs between July and November. |
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