Canal Segment Contaminated Sediment Remediation

ENTACT performed remediation of mercury- and lead-contaminated sediments from an approximate 3,600-linear-foot segment of a closed canal. The scope of work included protection of surrounding structures and existing pavement; asbestos abatement and demolition of a building and shed; construction of a temporary remediation support area with two dredge processing cells and a temporary water pretreatment system area, multiple staging areas along the canal, and a temporary water management system; cleanout of an existing culvert; mechanical dredging of ~30,000 cubic yards of sediment from a floating barge assembly; dewatering and conditioning of sediments; characterization, transportation and off-site disposal; placement of a subaqueous cap and cover system consisting of 14,000 cubic yards of granular backfill within the canal; placement of 26,800 cubic yards of granular fill and topsoil for construction of a multiuse path; extension of City storm sewers; and restoration of canal banks with coir fabric and seed.