Harrison, New Jersey
The Town of Harrison has a former MGP Site that is approximately 32 acres in size. It operated as a base load facility from 1926 until approximately 1963, when it was converted to peak shaving status. The facility was retired from service after the winter of 1986 – 1987 and decommissioned in 1992. Compounds of concern present in soils include benzene, toluene, ethylbenzene and xylene(s) (or BTEX), naphthalene, and polycyclic aromatic hydrocarbons.
Sevenson, as the prime contractor, self-performed the ISS of 419,452 CY (318,389 CY via bucket mixing and 101,063 CY via auger) of contaminated soils; excavation and dewatering of 201,721 CY of contaminated soil; removal of 28,889 tons of sub-surface debris; installation of a 2,200 LF soil-bentonite hydraulic barrier wall; and demolition of 11 buildings. Sevenson successfully tracked and shipped 285,180 tons of material off-site to seven different disposal facilities. For ISS utilizing the auger mixing method, Sevenson utilized a Bauer BG45 track mounted rotary drilling rig modified to accommodate large diameter mixing tools to mix soils to a depth of 42-ft. BGS. Crews performed ISS via the excavator bucket mixing method from 7 ft. BGS to 32 ft. BGS. Soils were bucket mixed in 33 ft. x 33 ft. cells. A slurry mixture of cement, slag, and water was blended into the impacted soil to achieve the target treatment parameters.