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Loeffel Landfill Superfund Site Maxymillian Technologies (MT) provided PCB cleanup and containment for the Loeffel Landfill New York State Superfund Site in Nassau, NY. The 25-acre abandoned landfill was contaminated with PCBs, industrial chemicals and debris. MT's work consisted of installing drainage, installing a 3,200 lf soil/bentonite cutoff wall around the entire site, placing a clay cap, and loaming and seeding the capped area over approximately 18 months. MT protected the existing monitoring wells and drainage swale that were slated for continued use, and installed a new drainage system to control run-off. Prior to installing the slurry wall, MT built a 75'-wide working platform around the proposed wall perimeter. The 3-foot thick cutoff wall penetrated 30 to 90 feet deep, totaling 160,000 vertical square feet, and keyed into existing bedrock. MT then spread excavated material in the area that was eventually capped. MT then re-graded the site and installed an impervious (3 x 10-7 cm/sec) clay cap to prevent rainwater from leaching. MT spread cap material in 1' lifts over the entire area, compacted the cap to 90% of its maximum density, and tested it to verify permeability requirements. Additionally, MT installed monitoring wells and a leachate collection system consisting of an 8,000 gallon fiberglass tank, perforated schedule 40 PVC pipe, crushed stone and filter fabric. Leachate is collected in a 10,000 gallon holding tank where it is monitored before being trucked off-site for treatment. Ultimately, MT hydroseeded the area with fertilizer, mulch, grass and wildflowers. The former Loeffel Landfill area is now a grassy field.
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above: Deep slurry wall construction. below: Re-grading prior to cap placement. 
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