Los Angeles Selects Remediation Materials by AquaBlok®

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Isolation Layer Enables Lake Ecosystem Rehabilitation

AquaBlok, Ltd., a leading manufacturer of treatment materials for environmental remediation, is providing key sediment remediation materials for the Machado Lake Ecosystem Rehabilitation Project.

Machado Lake, a recreational area near Los Angeles, is contaminated with toxic sediments containing DDT, PCBs and heavy metals. The City of Los Angeles plans to transform the contaminated lake, part of Ken Malloy Harbor Regional Park, into a new recreational area. The primary goal of the Machado Lake Ecosystem Rehabilitation Project is to improve water quality in the 45-acre lake while enhancing natural habitat and providing new recreational opportunities.

Low permeability bentonite-based capping materials by AquaBlok Ltd. of Toledo, OH were chosen by LA County Engineers to improve water quality and support natural habitat. Engineers used the AquaBlok layer to sequester and isolate residual contaminants. This allows for the establishment of a clean layer to support benthic recovery and restoration.

The project uses a dredge and cap approach to isolate residual contamination in the sediments after dredging. A hydraulic dredge will remove approximately 239,000 cubic yards of contaminated sediments. Following dredging, the lake bottom is to be capped with an approximate 6-inch thick AquaBlok layer. The project will require over 33,000 tons of AquaBlok 2080FW to form the isolation capping layer.

The AquaBlok layer will then be covered with materials to enhance habitat recovery. The $111-million project, funded by California Proposition-O, is scheduled to be completed by spring 2017.

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John Collins

Hugh W. Collins
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