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EPA ISSUES EXPLANATION FOR CHANGES MADE IN CLEANUP PLAN FOR PORTION OF SANGAMO WESTON, INC./TWELVE MILE CREEK/LAKE HARTWELL SUPERFUND SITE

 ATLANTA, June 28 /PRNewswire/ -- The U.S. Environmental Protection Agency announced today the signing of a document which explains changes made in the cleanup plan for a portion of the Sangamo Superfund site (referred to as Operable Unit One) in Pickens County, S.C.
 Operable Unit One (OU1) consists of the Sangamo Plant site and six satellite disposal areas in Pickens County. The document, an Explanation of Significant Differences (ESD), modifies the Record of Decision (ROD) for cleanup that was signed in December 1990 and the previous ESD which was issued in September 1991.
 The current ESD presents the agency's determination that metals at the site do not pose a significant threat to human health or the environment. Supporting data with respect to metals contamination in soils and groundwaters are presented and discussed in the ESD. Further, groundwater remediation criteria for two metals, beryllium and thallium, are updated to reflect Maximum Contaminant Levels promulgated by EPA in July 1992.
 Also, the ESD waives certain requirements for the storage of PCB- contaminated wastes on the plant site until treatment operations begin. The waiver is based upon the consideration that the storage of PCB waste on the plant site is an interim measure. Full compliance with the requirements, as set forth in the Toxic Substances Control Act, would delay the excavation of the contaminated soils in the satellite sites. This delay would result in greater risk to human health and the environment than would occur if excavation could proceed without delay.
 The ESD, along with the Administrative Record for OU1, is available for review at the following site information repositories: The Village Library, Pickens, S.C.; R.M. Cooper Library, Clemson University, Clemson, S.C.; Easley Branch, Pickens County Public Library, Easley, S.C.; and the Hart County Library, Hartwell, Ga. The files are also available for review at the Records Center, U.S. EPA Region IV, 345 Courtland St. N.E., Atlanta, GA 30365.
 EPA will accept public comments on the ESD for a period of 30 days (Wednesday, June 30, through Friday, July 30). All comments should be submitted in writing to R. Bernie Hayes, remedial project manager, or Cynthia Peurifoy, community relations coordinator, at the address provided above. For further information, or to be added to the site's mailing list, contact Peurifoy at 800-435-9233.
 During the summer of 1993, Schlumberger Industries, Inc., with EPA oversight, will begin excavation of six satellite disposal sites that are part of the overall Sangamo site. The excavated waste materials and contaminated soils will be transported to the plant site for storage until such time as the treatment systems for these materials can be placed in operation. Treatability studies for the chosen treatment technology and low temperature thermal desorption have already begun. Final design of this system and selection of a contractor or vendor for the treatment system will begin soon.
 Design of the groundwater extraction and treatment system required by the ROD have also begun. Once those designs have been completed and approved by EPA, Schlumberger will construct the extraction system and place it into operation.
 -0- 6/28/93
 /CONTACT: Cynthia Peurifoy, community relations, 404-347-7791, or Charlis Thompson, press office, 404-347-3004, both of the U.S. Environmental Protection Agency/


CO: U.S. Environmental Protection Agency, Region IV ST: South Carolina IN: ENV SU: EXE

BN-BR -- AT008 -- 6368 06/28/93 15:23 EDT
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Date:Jun 28, 1993
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