Mannington Township, New Jersey
This project involved remedial activities in the inactive industrial landfill, Northern Pledger Creek (NPC), Central Pledger Creek (CPC) and Southern Pledger Creek (SPC). The landfill is located at the southwest portion of the Mannington Mills facility, and all creek reaches are west of, north of, and adjacent to the facility. The primary contaminants of concern are PCBs and mercury.
Sevenson self-performed re-grading of 21,740 CY of material of a landfill to develop a geotextile tube laydown area; installation of 1,050 LF of AZ-19-700 sheet pile, ranging in depths from 25–35 ft. to ensure there is no settlement of the nearby railroad; hydraulic and mechanical dredging of 70,025 CY of PCB and mercury-contaminated material; dewatering of 66,725 CY of sediment, utilizing 70 Geotubes®; and placement of a 214,900 SF sediment cap consisting of medium sand, fine gravel and stone. Sevenson also designed and installed a 2,000-GPM WWTP (treated and discharged >164.7M gallons of water back into Pledger Creek). Sevenson received the Western Dredging Association 2023 Safety Excellence Award.