Superfund Information Systems: Site Profile

Superfund Site:

SANGAMO WESTON, INC./TWELVE-MILE CREEK/LAKE HARTWELL PCB CONTAMINATION
PICKENS, SC

Cleanup Progress

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Cleaning up Superfund sites is a complex, multi-phase process. Learn more:

Site Milestones

Milestone Date(s)
Initial Assessment Completed 09/05/1985
Proposed to the National Priorities List 01/22/1987
Finalized on the National Priorities List 02/21/1990
Remedial Investigation Started 06/18/1987
Remedy Selected 12/19/1990
Final Remedy Selected 06/28/1994
Remedial Action Started 11/22/1993
Final Remedial Action Started 01/03/2017
Construction Completed 08/09/1999
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 06/02/2020
Site Ready for Reuse and Redevelopment 04/06/2015

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Cleanup Schedule by Operable Unit

During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

Milestone OU Start Date Completion Date OU ID
Administrative Order of Consent (EPA Performed) OU 00 - SITEWIDE 06/18/1987 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 12/03/1992 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 09/23/1998 00
Removal (PRP Performed, EPA Oversight) OU 00 - SITEWIDE 07/17/1989 10/23/1989 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/21/2004 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/29/2005 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 02/10/2010 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 03/25/2015 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 06/02/2020 00
Partial NPL Deletion (EPA Performed) OU 00 - SITEWIDE 09/28/1998 00
Partial NPL Deletion (EPA Performed) OU 00 - SITEWIDE 01/04/2002 00
Combined Remedial Investigation/Feasibility Study (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 06/18/1987 12/19/1990 01
Record of Decision (EPA Performed) OU 01 - PLANT SITE + 6 REMOTE SITES 12/19/1990 01
Record of Decision Amendment (EPA Performed) OU 01 - PLANT SITE + 6 REMOTE SITES 09/29/2009 01
Explanation of Significant Differences (EPA Performed) OU 01 - PLANT SITE + 6 REMOTE SITES 09/10/1991 01
Explanation of Significant Differences (EPA Performed) OU 01 - PLANT SITE + 6 REMOTE SITES 06/18/1993 01
Remedial Design (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 04/15/1992 11/22/1993 01
Remedial Design (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 06/30/1992 03/11/1997 01
Remedial Action (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 11/22/1993 08/30/1998 01
Remedial Action (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 03/11/1997 07/07/2017 01
Remedial Action (PRP Performed, EPA Oversight) OU 01 - PLANT SITE + 6 REMOTE SITES 01/03/2017 07/07/2017 01
Unilateral Administrative Order (EPA Performed) OU 02 - WATERSHED-OU02 09/25/1998 02
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 02 - WATERSHED-OU02 08/31/1990 06/28/1994 02
Record of Decision (EPA Performed) OU 02 - WATERSHED-OU02 06/28/1994 02
Explanation of Significant Differences (EPA Performed) OU 02 - WATERSHED-OU02 09/03/2009 02
Remedial Design (PRP Performed, EPA Oversight) OU 02 - WATERSHED-OU02 10/19/1998 10/19/1998 02
Remedial Action (PRP Performed, EPA Oversight) OU 02 - WATERSHED-OU02 10/19/1998 09/20/2002 02

NOTE: Dates and estimated dates will not display for all milestones. Estimated dates only display for milestones planned within the next three fiscal years. Estimated dates and start dates will not display for the following enforcement milestones: Administrative Order of Consent, Consent Decree and Unilateral Administrative Order. Start dates will not display for the following document milestones: Five-Year Review, Record of Decision, Record of Decision Amendment, Explanation of Significant Differences and Partial NPL Deletion.

DISCLAIMER: The data on this page are derived from the Superfund Enterprise Management System and are solely for informational purposes. The data cannot be relied upon to create any substantive or procedural rights or requirements enforceable by any party in litigation with any member of the public, states, tribes, the United States or any federal agency. EPA reserves the right to change these data at any time without public notice.

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