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Whether redeveloping a former brownfield into a large retail shopping center or protecting nearby developments from contaminate migration from effected nearby waters, CETCO has the solution. Remediation efforts range in scope from environmental dredging and in-situ capping and monitored natural recovery to vapor mitigation strategies. Regardless of the remediation conceptual site model, utilization of the latest technology and technical assistance with high-quality products can aid the implementation. CETCO’s high quality products have been used to solve challenging water and land based environmental remediation projects worldwide. Reactive Core Mat®
Reactive Core Mat® (RCM) is an innovative product specially designed to provide a method of placing active materials into sub-aqueous sediment caps. RCM may consist of a variety of active materials encapsulated between carrier textiles, which are adhered together to provide product integrity. RCM is used for in-situ subaqueous capping of contaminated sediments or post-dredge residual sediments. RCM provides a reactive material that treats contaminants, which are carried by advective or diffusive flow. A reactive cap allows for thinner cap thickness than a traditional sand cap. Additional benefits of geotextiles provide stability and physical isolation. RCM can also be used for embankment seepage control and groundwater remediation. For instance, Stryker Bay, in Duluth, Minnesota was heavily polluted from the late 1800s through 1962. The harbor area was ringed with tar and coke plants, heavy industry and slaughterhouses that all discharged industrial waste into the water. Coal tar in some areas was 13 feet thick under the water. The sediment in the bay, slips and part of the river was contaminated with mercury, polyaromatic hydrocarbons, lead and other toxins as well as a NAPL seep. In order to remediate the situation, sheet piling was installed around the surcharge cap area and a 6 inch sand cap and activated carbon mat was placed over the sediments. A 3.5-foot sand cover and 4.5 foot-6.5 foot surcharge load was then placed over the reactive mat. The remaining area was dredged and pumped to CAD while allowing the surcharge to consolidate sediment. Finally, the surcharge sand was removed to cap CAD. Liquid Boot®
Gas vapor barriers offer a unique set of challenges when implementing environmental remediation projects. CETCO provides solutions to these issues through its unique and incomparable gas vapor barrier technology, which is tailored to each project’s individual need. Gas vapor barriers are installed beneath the footprint of a structure to block hazardous gases from penetrating the building, compromising indoor air quality. Liquid Boot® is a cold, spray-applied, water-based membrane containing no VOCs, which provides a seamless, impermeable barrier against vapor intrusion into structures. Liquid Boot® is sprayed-applied directly to penetrations, footings, grade beams, pile caps, etc., providing a fully-adhered gas vapor barrier system. For example, Iris Campus is the home to the new Gates Foundation Headquarters, located in Seattle, Washington. 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. CETCO provided solutions for both the soil contamination and perched groundwater conditions. CETCO’s Dual System, featuring Liquid Boot® Gas Vapor Barrier and UltraSeal® Waterproofing, 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. The CETCO Dual System proved to be a cost effective solution for the project. The project is expected to be completed in Spring of 2011. SLDT |
