Publication Summary

Title

Endicott Wastewater Treatment Plant Limited Class II Inspection and Impact of Discharge on Rebel Flat Creek

Month-Year PublishedMarch 1990
Online Availability
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Short Description

On October 11-13, 1988, a limited Class II Inspection and receiving water survey were conducted at the Endicott Wastewater Treatment Plant (WTP). The purpose of the study was to determine WTP efficiency and assess effects of effluent discharge on Rebel Flat Creek.

(Also see abstract below)
Publication Number90-e70
Author(s)Willms, R. and W. Kendra
Print Availability
Request from the program.
Not maintained in stock. Copy must be made from archive version.
Number of pages 27 pp.
Keywords ammonia, BOD5, chemical, chemical oxygen demand, creek, dissolved oxygen, effluent, fecal coliform, flow, receiving water, recommendations, site investigation, study, TMDL, Total Maximum Daily Load, total suspended solids, TSS, wastewater treatment plant, water, water quality
Subject Waterbodies
Rock Creek
map of Washington state showing locations of subject waterbodies
Abstract Long Description

On October 11-13, 1988, a limited Class II Inspection and receiving water survey were conducted at the Endicott Wastewater Treatment Plant (WTP). The purpose of the study was to determine WTP efficiency and assess effects of effluent discharge on Rebel Flat Creek.

Biochemical oxygen demand (BOD5) and total suspended solids (TSS) were well within permit limits; however, fecal coliform and chlorine concentrations were not. The WTP had intermittent flow. The creek to effluent dilution ratio was 3:1 during a typical morning discharge cycle. Chlorine was found at toxic levels in the creek. Total maximum daily load (TMDL) modeling predicted violations of water quality criteria for chlorine, un-ionized ammonia, fecal coliform, and dissolved oxygen at critical design conditions. Recommendations include an efficiency assessment of the chlorination system, effluent removal from the creek during summer low flow, and water quality-based permit limits for the winter flow period.

This page last updated May 18, 2009