Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Session 06B: Construction /Alternative Delivery
Monday, 09/Sep/2019:
1:15pm - 2:45pm

Session Chair: Dick Talley, Stantec Consulting Services, Inc;
Location: E145

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1:15pm - 2:00pm

Challenging Sewer Bypass of the 96-Inch Diameter Eastside Interceptor

Erik Waligorski1, Brian Sliger1, Matoya Darby2

1Carollo Engineers; 2King County Wastewater Treatment Division; ,

King County Wastewater Treatment Division needs to rehabilitate approximately 3,900 feet of severely corroded 96-inch diameter reinforced concrete pipe located in Renton, WA. The existing pipe, constructed in 1964, is a portion of the Eastside Interceptor installed in an urban area between Boeing’s 737 commercial airline facility and the Renton Landing development.

King County completed an alternatives analysis and selected Linabond as the preferred rehabilitation technology in order to maintain existing capacity. The rehabilitation process requires workers to be in the pipe to prepare and apply the Linabond coating. This is accomplished from work platforms constructed in the pipe with live flow conveyed under the platform.

During design of the project, Carollo completed a Flow Bypass Study to analyze existing flows in the interceptor and to develop a plan to bypass up to 45 mgd during low-flow summer months to allow for the rehabilitation of the existing sewer. Historical data showed that flows remain under 45 mgd 98% of the time. The bypass plan included provisions in the design that allowed for working under live flow conditions while providing the capability to remove all essential personnel and equipment from within the pipe during emergency high flow conditions should flows exceed 45 mgd. The bypass plan also included the preparation of a flow management plan that included coordination efforts of three wastewater treatment plants and two offsite operations groups, in addition to the project team to manage flows entering the project area.

This presentation will look at the risk management aspects addressed in preparing the bypass sewer plan, including construction footprint constraints, operational agreements, traffic impacts, and community mitigation measures for both noise and odor during construction. Attendees will also learn what measures were taken to allow for the bypass system to be removed and reinstalled during emergency high-flow situations.

2:00pm - 2:45pm

Panel Discussion: Improved Project Delivery– A Construction Perspective

Michelle Green1, Jeff Wall2, Tom Paul3, Rob Bechtloff4, Tim Janesofsky5

1Jacobs, United States of America; 2Slayden; 3Mortenson; 4McClure and Sons; 5James W Fowler; , , , ,

A panel of active, local contactors with over a century of combined experience in wastewater construction will share insight and experience from their careers. The panel will discuss consistent interdisciplinary design gaps and lessons learned in engineering designs that need to be corrected in construction, with suggestions on how to improve these gaps for fewer change orders and improved quality. They will also discuss best-for-project contract terms and the changing construction market forces driving construction today, from equipment, materials, concrete specifications, and labor. Finally, the panel will answer questions on how to improve project delivery.

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