Record of Decision System (RODS)
|Site Name:||OSBORNE LANDFILL|
|Address:||0.5 MILES E OF TOWN|
|City & State:||GROVE CITY PA 16127|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Contaminant:||Metals, PAH, PCBs, VOC|
Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
The Osborne Landfill site is located in Pine Township, Mercer County, Pennsylvania. The land use surrounding this site is a combination of woodlands (to the north), farmland (to the east), Federally protected wetlands (to the west and southwest), and residential homes (within a quarter mile of the site).
Strip mining was conducted at the site during the 1940s prior to disposal of wastes in the strip pool. The basis for concern at the site was the presence of approximately 233,000 cubic yards of fill material, which was contaminated with polychlorinated biphenyls (PCBs), polynuclear aromatic hydrocarbons (PAHs), metals (lead and chromium), and several volatile organic compounds (VOCs). The contents of the fill mainly consist of spent foundry sand. Solid waste and manufacturing refuse are also present on the surface of the site and within the fill material.
Fill material was deposited into the strip pool at the base of the highwall from the late 1950s to 1978, when the site was closed by the Pennsylvania Department of Environmental Protection (PADEP) due to the lack of a permit to accept the wastes. This dumping eventually created three separate on-site leachate ponds. Materials disposed at the site include: spent sand, infilco sludge, spent carbide, waste acids from plating and cleaning tanks, spent Sunoco spirits and solvents. Miscellaneous debris including scrap steel, wood, and metal chips.
The Environmental Protection Agency (EPA) and the PADEP following the facility closure in 1978 investigated the site. In 1983 Cooper Industries, one of the Potentially Responsible Parties (PRPs), installed a security fence around the site, as well as conducted the removal of 600 drums and 45 cubic yards of soil. Cooper Industries also conducted a Remedial Investigation (RI) at the site, in accordance with a Consent Order and Agreement between Cooper Industries and PADEP. In 1985, the EPA conducted an investigation of the disposal area to determine the contaminants in the waste. In 1988-1989, the EPA conducted a second RI to assess the nature and extent of contamination in all media (groundwater, surface water, waste, and soil/sediments). A Feasibility Study (FS) was conducted which identified alternatives for remediating the site. A Record of Decision (ROD) was completed in 1990 which addressed contamination in the fill, the leachate associated with the fill and the Clarion Aquifer. EPA entered into a Consent Order and Agreement, with Cooper Industries in 1992; Cooper Industries was required to conduct a Focused RI/FS and Risk Assessment limited to the wetland sediments and the groundwater in the Homewood, Connoquenessing and Burgoon Aquifers. a ROD was completed in December 1997.
The report on the wetlands studies concluded that the low level of contamination in the wetland has not had a measurable impact on its environment. The Environmental Protection Agency (EPA) agrees with the conclusions presented in the focused Remedial Investigation and has concluded that no remedial action is warranted for the wetlands studied.
The selected remedy for the Osborne Landfill site includes monitoring existing and new monitoring wells in the Clarion Aquifer and Mine Void System (CM) to track the continuing natural attenuation of vinyl chloride and other volatile organic compounds (VOC) in the groundwater. The selected remedy also includes monitoring of existing wells in the Connoquenessing and Burgoon Aquifers to verify contamination is not migrating from the site toward community wells.
Costs for Clarion Aquifer
Capital Cost: $43,000
Present Worth Cost: $388,000
Costs for Deep Aquifers:
Capital Costs: none
Present O&M: $22,800
Present Worth Cost: $82,600
Approximate Present Worth Cost for both monitoring programs: $471,000
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