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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Tekoa Wastewater Treatment Plant Dissolved Oxygen, pH, and Nutrients Receiving Water Study |
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Tekoa Wastewater Treatment Plant Dissolved Oxygen, pH, and Nutrients Receiving Water Study (Number of pages: 86) (Publication Size: 6360KB)
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| Author(s) | Tighe Stuart | ||||
| Description | The City of Tekoa, located near the Idaho border south of Spokane, operates a wastewater treatment plant (WWTP), which discharges to Hangman Creek. Aging facility infrastructure and a compliance schedule for effluent temperature limits from the Hangman Creek Watershed Fecal Coliform, Temperature, and Turbidity Total Maximum Daily Load (Joy et al, 2009) have created a need for facility upgrade or replacement. To determine the effluent nutrient load limits needed to protect pH and DO in Hangman Creek, and to provide the information needed for Tekoa’s facility planning efforts, Ecology undertook a receiving water field study during May-October 2017. The study focused on nutrients, pH, dissolved oxygen, and algal eutrophication. We found impacts to pH and DO, as well as pH in excess of 8.5 S.U., downstream of Tekoa WWTP during the summer months. We used a linkage of two simple model frameworks to assess the sensitivity of pH and DO in Hangman Creek to nutrients. We calculated proposed effluent load limits for Tekoa WWTP for dissolved inorganic nitrogen (DIN) and total phosphorus (TP). These limits are applicable each year during June through October. We also emphasize the need to restore riparian vegetation along Hangman Creek. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | Environmental Assessment Program Publications Coordinator at 360-407-6764 or EAPPubs@ecy.wa.gov | ||||
| Keywords | WWTP, Hangman Creek, nutrients, wastewater treatment plant, nitrogen, eutrophication, 303(d), watershed, TMDL, Total Maximum Daily Load, pH, phosphorus, dissolved oxygen | ||||
| WEB PAGE | Hangman Creek TMDL | ||||
| WATERSHED | Water Resource Inventory Area 56 Hangman | ||||
| DATA | Environmental Information Management (EIM) #tist0002 |
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| RELATED PUBLICATIONS | Title:
Hangman Creek Watershed Nutrients and Sediment Pollutant Source Assessment Quality Assurance Project Plan: Hangman Creek Dissolved Oxygen, pH, and Nutrients Pollutant Source Assessment Hangman Creek Watershed Dissolved Oxygen, pH, and Nutrients Total Maximum Daily Load Study: Data Summary Report Hangman (Latah) Creek Watershed Fecal Coliform, Temperature, and Turbidity Total Maximum Daily Load: Water Quality Improvement Report Executive Summary of Hangman (Latah) Creek Watershed Fecal Coliform, Temperature, and Turbidity Total Maximum Daily Load: Water Quality Improvement Report Quality Assurance Project Plan: Hangman Creek Watershed Dissolved Oxygen and pH Total Maximum Daily Load Water Quality Study Design |
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