Proven protection against petroleum gas and water migration case study

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Courtesy of CETCO

Project : 500 Fifth Avenue Nort|h
Location : Seattle, WA
Products : Liquid Boot® Gas Vapor Mitigation System, Ultraseal® Waterproofing System

Background: Vapor intrusion has become a signifi cant environmental issue for regulators, industry leaders, and concerned residents nationwide. The use of a spray-applied gas vapor barrier to protect against the threat of vapor intrusion has become a widely recognized application by numerous local and state regulatory and guidance groups.

Challenge: To install a seamless and gas- tight membrane to the 250,000 square foot underslab and to cost-effectively seal around the numerous pentrations, columns and tie backs and to protect the 70,000 square feet of vertical walls from water ingress.

This renowned and prestigious school campus site is the home to a world-class headquarters facility, located in Seattle, WA. The campus is situated on a site with petroleum gas issues from a former maintenance facility. The campus has a large underground parking structure with two buildings and a plaza on top.

Solution: CETCO provided solutions for both the soil contamination and perched groundwater conditions. CETCO’s Dual System, featuring Liquid Boot Gas Vapor Barrier and UltraSeal Waterproofi ng, was installed to 70,000 square feet of vertical walls to protect the new structures from both water and gas migration into the enclosed areas. The Liquid Boot Gas Vapor system was also installed to the 250,000 square foot underslab portion to protect against potential vapor intrusion, as well as a permanent drainage system. The structures required a cost effective solution that could effectively seal around thousands of pipe penetrations, 200 columns and 600 tie backs.

Result: Liquid Boot Gas Vapor Barrier and UltraSeal Waterproofi ng, provided by CETCO Building Materials, proved to be the most cost effective solution for the project. CETCO’s certifi ed installers were able to quickly, effectively and safely install the 320,000 sq. ft. of material within the set deadline.

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