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| Title | Spokane River Basin Class II Inspection at the City of Spokane Wastewater Treatment Plant | |||
| Month-Year Published | May 1994 | |||
| Online Availability |
1216 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
Announced Basin Class II Inspections were conducted at three industrial wastewater treatment plants (WWTPs) and two municipal WWTPs including the city of Spokane in the Spokane River basin during March 22-24, 1993. A separate inspection report was written for each discharger in the basin. This report is based on the inspection conducted at the city of Spokane WWTP. (Also see abstract below) | |||
| Publication Number | 94-89 | |||
| Author(s) | Das, T. | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 12 pp. | |||
| Keywords | ammonia, basin, BOD5, chemical, chemical oxygen demand, copper, effluent, fecal coliform, flow, Inspection, inspections, lead, mercury, metals, mixing zone, pH, river, SEPA, silver, site investigation, Spokane River, study, total residual chlorine, total suspended solids, toxic, toxicity, treatment, TSS, waste, wastewater, wastewater treatment plant, water, water quality, zinc | |||
| Subject Waterbodies |
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| Abstract | Long Description |
Announced Basin Class II Inspections were conducted at three industrial wastewater treatment plants (WWTPs) and two municipal WWTPs including the city of Spokane in the Spokane River basin during March 22-24, 1993. A separate inspection report was written for each discharger in the basin. This report is based on the inspection conducted at the city of Spokane WWTP. The plant was operating well at the time of inspection and met permit requirements for five-day biochemical oxygen demand (BOD5), total suspended solids (TSS), fecal coliform, pH, ammonia, mercury, and silver. According to the permittee's discharge monitoring report (DMR), effluent exceeded the daily maximum loadings for total residual chlorine -- violations of the permit. Removal efficiencies for BOD5 and TSS were higher than the 85% requirement. Ammonia, lead, and mercury concentrations exceeded chronic water quality criteria, while copper and zinc concentrations exceeded both acute and chronic water quality criteria. A concurrent metals study progressing in the Spokane River basin should provide insight concerning the potential for effluent metals toxicity at acute and chronic mixing zone boundaries. Due to heavy rains during the inspection, the monthly average design flow was exceeded by approximately 29%; influent BOD5 and TSS loads also exceeded design criteria. |
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