Publication Summary

Title

Pomeroy Wastewater Treatment Plant Limited Class II Inspection and Receiving Water Study on Pataha Creek

Month-Year PublishedJune 1992
Online Availability
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Short Description

A Limited Class II Inspection and receiving water survey was conducted at Pomeroy Wastewater Treatment Plant (WTP) on October 15-16, 1991. The purpose of the study was to determine WTP efficiency and assess impacts of effluent discharge on Pataha Creek.

(Also see abstract below)
Publication Number92-e06
Author(s)Cusimano, B.
Print Availability
Request from the program.
Not maintained in stock. Copy must be made from archive version.
Number of pages 38 pp.
Keywords ammonia, BOD5, chemical, chemical oxygen demand, creek, dissolved oxygen, effluent, fecal coliform, pH, receiving water, recommendations, site investigation, stream, study, temperature, total residual chlorine, total suspended solids, TSS, wastewater treatment plant, water, water quality
Subject Waterbodies
Pataha Creek
map of Washington state showing locations of subject waterbodies
Abstract Long Description

A Limited Class II Inspection and receiving water survey was conducted at Pomeroy Wastewater Treatment Plant (WTP) on October 15-16, 1991. The purpose of the study was to determine WTP efficiency and assess impacts of effluent discharge on Pataha Creek.

Biochemical oxygen demand 5-day (BOD5), total suspended solids (TSS), total residual chlorine (TRC), pH, and fecal coliform were found to be within permit limits at the WTP. The receiving water study identified an effluent dilution of about 12:1 for the survey and fecal coliform concentrations were found to exceed the water quality criteria above the WTP. The WTP effluent did not affect downstream temperature, however, dissolved oxygen, pH, and nutrient concentrations were altered by the effluent. In addition, instream ammonia concentrations below the plant exceed the chronic water quality criterion. Worst-case modeling predicted water quality violations for ammonia and dissolved oxygen under selected design conditions. Recommendations include improving treatment for ammonia and land application of effluent during summer conditions to mitigate the effects of ammonia and BOD on creek water quality.

Link to EIM data for User Study ID BCUS0001

This page last updated May 11, 2009