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Osborne Landfill

Issues an Explanation of Significant Differences for the Osborne Landfill Superfund Site Record Of Decision # 1

On August 24, 1998, the U.S. Environmental Protection Agency (EPA) issued the first of two Explanations of Significant Difference (ESD) for the Osborne Landfill Site located in Pine Township, Mercer County, Pennsylvania. This ESD, also approved by the Pennsylvania Department of Environmental Protection (PaDEP), makes minor changes to the cleanup plan described in the September 28, 1990, Record of Decision (ROD # 1).

The cleanup plan for Operable Unit 1 described in the 1990 ROD included a clay cap, a slurry wall and extraction wells to remove contaminated ground water from the fill. The ESD alters four parts of the 1990 ROD based on new information found during the cleanup process. These four changes are summarized below:

  1. The ESD clarifies land restrictions outlined in the 1990 ROD that are used to prevent activity on surrounding land that could be unsafe to human health or the environment. It also reduces the restriction on constructing new wells to the property which contains the landfill.
  2. The standards used to determine whether ground water cleanup has achieved acceptable levels of contamination have changed from Method Detection Levels (MDLs) to practical quantitation levels. Currently, labs cannot detect contaminants in concentrations as small as those stated in the ROD. Therefore, the best available results - practical quantitation levels - will be used.
  3. Homewood Aquifer Performance Wells 3 and 4 will no longer be held to the ground water flow standards of the other site wells. Homewood wells were originally held to these standards as a precaution against migrating contamination from leachate, but this aquifer showed little contamination even when the leachate was heavily contaminated.
  4. Due to very low levels of emissions from an air stripper used to remove vinyl chloride from leachate at the site, the Pennsylvania Department of Environmental Protection (PaDEP) approved a petition by Cooper Industries to release emissions from the air stripper without further treatment.

If you have questions about this ESD or other site activities, or wish to be added to the site mailing list, please contact:

Frank Vavra (3HS23)
Remedial Project Manager
U.S. EPA, Region III
1650 Arch Street
Philadelphia, PA 19103
(215) 814-3221

Pat Gaughan (3HS43)
Community Involvement Coordinator
U.S. EPA, Region III
303 Methodist Building
11th & Chapline Streets
Wheeling, WV 26003
(304) 234-0238

The ESD and other site-related documents are available for review at information repositories in the following locations:

Administrative Records Room
U.S. EPA Region III
1650 Arch Street
Philadelphia, PA 19103
(215) 814-3157
Contact: Anna Butch
Hours: M - F 8:30 a.m. - 4:30 p.m.

Grove City Library
125 West Main Street
Grove City, PA 16127
(412) 458-7320
Contact: Linda Bennett
Hours: M, T, W 10 a.m. - 5 p.m.
TH, F 10 a.m. - 8 p.m.

Please call in advance to schedule an appointment.

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