Case Studies of Ocean Outfall Inspections—San Francisco and Seattle

by Ken Lilly, Jr., CH2M Hill, Bellevue, United States,
Donald L. Kingery, CH2M Hill, Bellevue, United States,
Edward O. Cox, CH2M Hill, Bellevue, United States,
Dave Jones, CH2M Hill, Bellevue, United States,

Document Type: Proceeding Paper

Part of: Coastal Zone '93


Discharge of effluent from municipal wastewater treatment plants via outfalls into the nearshore ocean environment is a common means for disposal of waste and street water runoff coastal communities. A properly operating outfall pipeline is vital for preventing health-threatening pollution of nearby coastline and waters and for the proper operation of the treatment plant itself. Outfalls require occasional inspections, both internal and external, to monitor their conditions. Inspections are performed for a number of reasons including monitoring sediment accumulation in the pipe and in the environment around the pipe, locating or identifying any structural abnormalities, and determining the existing operating characteristics of the outfall. This paper examines the inspections of two outfalls: the San Francisco Southwest Ocean Outfall (SWOO), and the Seattle West Point Outfall. These inspections illustrate two approaches to a similar goal driven by different project requirements and site specific conditions. They also illustrate common problems encountered and measures used to address them.

Subject Headings: United States | Washington | Seattle | California

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