Jump to main content.

Osborne Landfill

August 1997


On August 6, 1997, the U.S. Environmental Protection Agency (EPA) issued the Proposed Remedial Action Plan (Proposed Plan) for the Osborne Landfill Superfund Site located in Pine Township, Mercer County, Pennsylvania. The Proposed Plan presents the clean-up alternatives EPA reviewed to address contaminated ground water and sediments in the wetlands to the southwest of the site. This fact sheet describes EPA's preferred alternatives and provides brief descriptions of the additional alternatives outlined in the Proposed Plan.

EPA has addressed the cleanup of the site in several components, called operable units (OUs), to make managing the site contamination easier. There are five OUs for the Osborne Landfill Site: OU1 - Fill Material in Strip Pit; OU2 - Wetland Sediments; OU3 - Leachate *; OU4 - Ground Water in the Clarion Aquifer (Clarion Aquifer and Mine Void System - referred to as CM); and OU5 - Homewood, Burgoon, and Connoquenessing, Aquifer Ground Water (referred to as HBC). EPA documented the clean-up plans for fill material in the strip pit and the associated leachate in a September 1990 Record of Decision (ROD). The construction work outlined in the OU1 (fill) and OU3 (leachate) ROD is complete. This Proposed Plan addresses the contamination and EPA's preferred alternatives for the remaining operable units (wetland sediments and all site ground water).

The Osborne Landfill covers approximately 15 acres, one mile east of Grove City, Pennsylvania. During the 1940s, strip mining occurred on the site property. After the 1940s, the property owners permitted the disposal of wastes in the former strip mining pool.

The site is bordered to the north by woodlands and to the east and southeast by farmland. A large shallow pond located west of the site is considered a Federally-protected wetland. Another wetland lies south of the site. Some residential homes are located along Enterprise Road, approximately one-quarter mile north of the site. Cooper Industries, one of the potentially responsible parties (PRPs) for the site, extended the municipal water line to these homes. All of the homes near the site, except for one, use the public water supply.

The basis of concern at the site was the presence of approximately 233,000 cubic yards of fill material, contaminated with metals and several volatile organic compounds. Materials disposed at the site include used sand, infilco sludge (sludge settled and collected from hydroblast equipment), used carbide (a byproduct consisting of a lime and water slurry); waste acids from plating and cleaning tanks; processed solvents; and miscellaneous debris.


During 1996, EPA identified the risks presented by contamination at OU2, OU4, and OU5 and prepared a Feasibility Study (FS) that identified possible clean-up options. Following are descriptions of EPA's preferred clean-up alternatives for each OU.

OU2 - Wetland Sediment

EPA required no action for the wetland sediments. Contamination was not found at levels that presented an unacceptable risk to the environment; therefore, EPA did not develop or evaluate alternatives.

OU4 - Ground Water in the Clarion Aquifer

EPA's preferred alternative is CM2, Natural Attenuation with Monitoring. EPA will conduct regular monitoring activities to ensure that contamination concentrations continue to decrease as contamination in the Clarion Aquifer naturally attenuates (decreases).

OU5 - Homewood, Burgoon, and Connoquessing Aquifers

EPA's preferred alternative for the Homewood, Burgoon, and Connoquenessing Aquifers is HBC2, Natural Attenuation with Monitoring.

EPA determined that the Homewood, Burgoon, and Connoquenessing Aquifers are undergoing natural attenuation and have already reached safe levels. Therefore, EPA does not propose to conduct any active ground water treatment, but prefers monitoring to protect the aquifers.

In September 1990, EPA selected the following remedies for OU1 and OU3 in the ROD. EPA installed a slurry wall and a clay cap to contain the contaminants in OU1. For OU3, EPA installed an extraction, treatment, and reinjection system to address the leachate. These remedial actions have addresses the source of contamination at the site. Consequently, EPA expects the decrease in ground water contamination to continue.


Following are brief summaries of the remaining alternatives that EPA evaluated as part of the Proposed Plan.

Superfund requires that EPA evaluate a no action alternative for every site to extablish a baseline or reference point to compare with the other cleanup alternatives. This requires no cleanup activities by EPA and the site remains in its current condition. EPA evaluated no action alternatives for OU4 and OU5.

OU4 - Ground Water in the Clarion Aquifer

Alternative CM3: In-situ Biodegradation
Alternative CM4: Air Sparging
Alternative CM5: Ground Water Extraction from Mine Voids, Treatment, and Reinjection


Feasibility Study
A study which evaluates site data to identify and evaluate possible clean-up methods for a site, including their benefits, limitations, and costs.
Liquid that passes through a landfill and has picked up dissolved, suspended, and/or other contaminants from the waste.
Volatile Organic Compound (VOC)
Man-made, carbon-based chemicals that vaporize when they come in contact with air. These chemicals are commonly used as solvents, degreasers, and dry cleaning chemicals.


EPA relies on community input to insure that the remedial alternatives being evaluated and selected for each Superfund site are fully understood and that the concerns of the local community have been considered.

During the comment period, EPA holds a public meeting to present the Proposed Plan, answer questions, and address concerns. The public meeting will be held at 7 p.m., on August 25, 1997, at the East Main Presbyterian Church, Fellowship Hall, 120 East Main Street, Grove City, Pennsylvania.

EPA will summarize and address all comments received at the public meeting and written comments postmarked by September 4, 1997, in the Responsiveness Summary section of the ROD. The ROD documents EPA's final selection of a clean-up plan for the site and will be made available to the public.

The Proposed Plan is currently available in the Administrative Record File, located at the information repositories below:

Grove City Library
c/o Ms. Linda Bennett
125 West Main Street
Grove City, PA 16127
Hours: M, T, W 10 a.m. - 5 p.m.
TH, F 10 a.m. - 8 p.m.

EPA Region III
c/o Anna Butch
1650 Arch Street
Philadelphia, PA 19103-2029
Hours: M - F 8:30 a.m. - 4:30 p.m.
(call ahead for appointment)


To submit written comments on the Proposed Plan, add your name to the mailing list. or to obtain more information about the site, please contact the following EPA representatives:

Frank Vavra (3HW23)
Remedial Project Manager
U.S. EPA Region III
1650 Arch St
Philadelphia, PA 19103-2029

Patrick Gaughan (3HW43)
Community Involvement Coordinator
U.S. EPA Region III
303 Methodist Building
11th & Chapline Streets
Wheeling, WV 26003

* Words in bold are defined in the glossary.

Region 3 | Mid-Atlantic Cleanup | Mid-Atlantic Superfund |EPA Home | EPA Superfund Homepage

Local Navigation

Jump to main content.