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Dewatering & Excavation of Contaminated Soil Below Groundwater
Northern New Jersey
Project Value: $985,000
TriState Environmental Services, Inc. Ted Sobieski
Phone: 215-638-4338
This project involved construction of a cofferdam utilizing steel sheet piling. After delineation, an area contaminated with 6,500 tons of acidic, TPH contaminated material was identified and the cofferdam was designed to facilitate excavation below groundwater. Due to the high TPH levels of the waste (>100,000 ppm) and the low pH (<2), air monitoring was performed throughout the excavation activities and the work was performed in acid resistant suits. As excavation activities were performed below groundwater, the excavation had to constantly be dewatered, generating 650,000 gallons of oily water that was recycled offsite. Once the excavation activities were started, Enviro-Air personnel worked 24 hours per day to minimize the overall time necessary for dewatering, thereby reducing the volume of water generated.
Once the contamination was removed, 21,500 cubic yards of clean backfill were imported, placed and compacted in the excavation. After the backfilling was completed, the 50-foot steel sheets that made up the cofferdam were removed and decontaminated. The entire area was covered with a two-foot thick soil and clay cap, after which an asphalt cap was placed over the entire area.
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