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| Title | Yakima River Basin Class II Inspections at Toppenish, Zillah, Sunnyside, Mabton, Wapato, Moxee, Selah, Ellensburg, and Granger Wastewater Treatment Plants | |||
| Month-Year Published | April 1993 | |||
| Online Availability |
3672 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
Unannounced Class II Inspections were conducted at nine municipal wastewater treatment plants in the Yakima River basin during September 14-23, 1992. (Also see abstract below) | |||
| Publication Number | 93-e19 | |||
| Author(s) | Glenn, N. | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 63 pp. | |||
| Keywords | ammonia, fecal coliform, flow, inspections, mixing zone, receiving water, river, site investigation, toxicity, wastewater treatment plant, water | |||
| Subject Waterbodies |
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| Abstract | Long Description |
Unannounced Class II Inspections were conducted at nine municipal wastewater treatment plants in the Yakima River basin during September 14-23, 1992. The most frequent problems, each occurring at about half the plants, were: - potential for chlorine toxicity in the receiving water; - potential for ammonia toxicity/nutrient enrichment in the receiving water; - wasteload to WWTP exceeds one or more design criteria; - potential for violation of weekly/monthly average fecal coliform counts; - flow measuring instrumentation needs calibration. Several plant sites need better maintenance practices; several are understaffed. Two of the WWTPs have considerably more problems than the remaining seven, namely Zillah and Mabton. Six of the nine facilities inspected during this survey have wastewater discharge permits that are due for reissuance. The potential of receiving water toxicity and plant overloading are two issues which should be addressed in revised permits, specifically by requiring mixing zone evaluations and planning for plant upgrades. |
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