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Lone Pine Landfill
Freehold Township, NJ

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Fourth Five Year Review [PDF 2.7 MB, 26 pp]

The 57-acre Lone Pine Landfill Superfund site is located adjacent to the Manasquan River in Freehold Township, Monmouth County, New Jersey.  The landfill is bounded by the Manasquan River to the north, Burke Road to the east, a forested wetland to the west, and a leaf composting facility to the south.  This location is rural to suburban and the closest residence is approximately 600 feet south of the landfill. A local sportsman's club and the Turkey Swamp Fish and Wildlife Management Area are approximately 1000 feet from the landfill. Additionally, a 700 acre municipal potable water supply reservoir is 16 miles downstream of the landfill, off of the Manasquan River.

The landfill began operation in 1959 by the now defunct Lone Pine Corporation. Until it was closed by the New Jersey Department of Environmental Protection (NJDEP) in 1979, the landfill accepted over 17,000 drums of chemical waste, municipal refuse, and millions of gallons of bulk liquid chemical wastes.  In 1981 and 1982, the United States Environmental Protection Agency (EPA) and NJDEP investigated the site to determine if it posed a threat to human health or the environment.  Excavation and sampling demonstrated the presence of leaking drums containing a variety of organic substances, heavy metals, and pesticides.  Severe ground water contamination was also documented and in September 1983, the site was placed on EPA's National Priorities List.

Based upon a remedial investigation and feasibility study (RI/FS) and public comment, EPA signed a Record of Decision (ROD) in September 1984 to contain the landfill and clean up contaminated ground water and landfill leachate directly beneath the landfill. The ROD required the construction of an impermeable cap and methane gas venting system; a slurry wall around the perimeter of the landfill; a ground water and leachate collection and treatment system; an on-site water treatment plant for treatment of the extracted ground water and landfill leachate; and a monitoring system to ensure that the remedy is effective.

Construction of this remedy began in July 1991 and was completed in December 1993. The major construction components included: installation of a 57-acre multi-layer cap; installation of a 5,965-foot slurry cut-off wall; installation of chemical leachate and methane gas collection systems; construction of a powder activated carbon treatment wastewater treatment plant with piping to the Ocean County Utilities Authority sewage treatment plant; installation of a methane gas flare; construction of a perimeter Lone Pine Landfill 12/7/12 drainage system; and installation of a hydraulic monitoring system.

In September 1990, EPA issued a ROD to address the contaminated ground water beyond the perimeter of the landfill. The ROD required: a 2,800-foot long interceptor drain to prevent contaminated ground water from entering the Manasquan River; extraction and injection wells; on-site treatment of the extracted ground water; institutional controls to restrict ground water usage in the area affected by the site; and a monitoring program.  Construction of the groundwater remedy was completed in June 1994.

The landfill is now in the operation and maintenance phase. The landfill is encapsulated, leachate generation is being prevented by the landfill cap, existing leachate is being extracted and treated, contaminated ground water no longer migrates into the Manasquan River, and the contaminated ground water is being treated.  In 2009, EPA completed its third Five-Year Review of the remedy at the Lone Pine Landfill Superfund site.  Based on that review, EPA recommended that the long-term operations, maintenance and monitoring at the Lone Pine Landfill should continue until future data indicate otherwise. EPA also determined that the remedy selected at the site continues to be protective of human health and the environment.


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