Housatonic River Upper Half-Mile Remediation
MT's work on this extensive sheeting/excavation project involved removing bank soil and river sediments, and restoration of the upper ½ mile of the Housatonic River. By project's end, MT drove 4000 lineal feet of sheeting, 16 feet into the ground. MT approached this sheeting challenge by installing sheeting in a contiguous series of two optimally designed cells of 250-1000 LF to achieve excavation and water diversion stability. The cells allowed MT to excavate PCB contaminated soils without cross contaminating into clean areas. While the cells were in dry condition, MT employed a small PC 90 excavator, lowered by crane into the cofferdam, to excavate river sediments into a temporary staging area for decanting. MT then used a large long-boom excavator with 75' reach to load the sediments from the river. MT used two bypass pumps to divert storm water discharged around the cells.
All soils were carefully segregated, decanted, and sampled prior to off-site disposal. Water resulting from dewatering and decanting was transported via MT installed piping and disposed of at the appropriate treatment facilities. Upon completion of each river segment, MT implemented extensive site restoration activities to replicate the river's habitat.
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