Development of a Predischarge Environmental Baseline Study for a Proposed Marine Municipal Outfall

by Robert I. Matsuda, Municipality of Metropolitan, Seattle, Seattle, WA, USA,

Document Type: Proceeding Paper

Part of: Coastal Zone '87


Increasing sewage inflows to the Metro Renton Wastewater Treatment Facility activated a planning process to expand the treatment capacity of the plant from 36 mgd to 72 mgd. However, concerns about potential ammonia and chlorine toxicity problems in the Green-Duwamish River due to the increased treated wastewater discharge, resulted in a decision to concurrently construct a new pipeline and outfall for the direct discharge of wastewater to Puget Sound. The general objective of the project was to develop an environmental baseline study that would provide data and information necessary to design a cost-effective post-discharge monitoring program that would effectively detect environmental changes, if any, resulting from the new wastewater discharge to Puget Sound.

Subject Headings: Water discharge | Environmental issues | Wastewater management | Water pollution | Local government | Wastewater treatment plants | Wastewater treatment | Sewage | Washington | United States

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