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| Title | Roslyn Post-Upgrade Wastewater Treatment Plant Limited Class II Inspection and Receiving Water Study on Crystal Creek | |||
| Month-Year Published | January 1991 | |||
| Online Availability |
2368 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
A Limited Class II Inspection and receiving water survey were conducted at Roslyn Wastewater Treatment Plant (WTP) on September 10-12, 1990. The purpose of the study was to determine WTP efficiency and assess impacts of effluent discharge on Crystal Creek. (Also see abstract below) | |||
| Publication Number | 91-e47 | |||
| Author(s) | Willms, R. | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 45 pp. | |||
| Keywords | ammonia, BOD5, chemical, chemical oxygen demand, Class II survey, creek, dissolved oxygen, effluent, fecal coliform, flow, infiltration, outfall, receiving water, recommendations, site investigation, stream, study, temperature, total suspended solids, TSS, wastewater treatment plant, water, water quality | |||
| Subject Waterbodies |
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| Abstract | Long Description |
A Limited Class II Inspection and receiving water survey were conducted at Roslyn Wastewater Treatment Plant (WTP) on September 10-12, 1990. The purpose of the study was to determine WTP efficiency and assess impacts of effluent discharge on Crystal Creek. Biochemical oxygen demand (BOD5), total suspended solids (TSS), and fecal coliform were well within permit limits. Infiltration and inflow (I&I) continues to be a problem at Roslyn, particularly during the wet season. The creek to effluent dilution was 6:1 during the survey. The Class A water quality criterion for fecal coliform was exceeded at two sites near Roslyn. Chlorine and temperature criteria were exceeded below the WTP outfall. Surveys of stream fauna showed very little impact from effluent discharge 300 feet below the outfall. A statistical comparison of 1985 and 1990 data indicated significant improvement for several water quality parameters. Worst-case modeling predicted water quality violations for chlorine, ammonia, fecal coliform, and dissolved oxygen under critical design conditions. Recommendations include correcting I&I problems, adding effluent dechlorination or an alternative means of disinfection at the WTP, and implementing water quality-based permit limits. |
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