Superfund Information Systems: Site Profile

Superfund Site:

PADUCAH GASEOUS DIFFUSION PLANT (USDOE)
PADUCAH, KY

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 05/04/1988
Proposed to the National Priorities List 05/10/1993
Finalized on the National Priorities List 05/31/1994
Remedial Investigation Started 04/10/1989
Remedy Selected 07/22/1993
Remedial Action Started 03/24/1994
Construction Completed Not Yet Achieved
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 09/30/2019
Site Ready for Reuse and Redevelopment Not Yet Achieved

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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 11/23/1988 00
Five-Year Review (Federal Facility Performed, EPA Oversight) OU 00 - SITEWIDE 12/30/2003 00
Five-Year Review (Federal Facility Performed, EPA Oversight) OU 00 - SITEWIDE 06/04/2009 00
Five-Year Review (Federal Facility Performed, EPA Oversight) OU 00 - SITEWIDE 09/30/2014 00
Five-Year Review (Federal Facility Performed, EPA Oversight) OU 00 - SITEWIDE 09/30/2019 00
Removal (Federal Facility Performed, EPA Oversight) OU 01 - 106 ADM ORDER / CONSENT 07/23/1993 04/08/1994 01
Removal (Federal Facility Performed, EPA Oversight) OU 01 - 106 ADM ORDER / CONSENT 08/30/1994 08/25/1995 01
Removal (Federal Facility Performed, EPA Oversight) OU 01 - 106 ADM ORDER / CONSENT 08/22/1995 02/22/1996 01
Removal (Federal Facility Performed, EPA Oversight) OU 01 - 106 ADM ORDER / CONSENT 08/07/1996 02/07/1997 01
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 01 - 106 ADM ORDER / CONSENT 04/10/1989 02/13/1998 01
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 02 - NW PLUME CONTAINMENT 1 05/21/1992 07/22/1993 02
Record of Decision (Federal Facility Performed, EPA Oversight) OU 02 - NW PLUME CONTAINMENT 1 07/22/1993 02
Explanation of Significant Differences (Federal Facility Performed, EPA Oversight) OU 02 - NW PLUME CONTAINMENT 1 01/27/2011 02
Remedial Design (Federal Facility Performed, EPA Oversight) OU 02 - NW PLUME CONTAINMENT 1 07/22/1993 02/09/1994 02
Remedial Action (Federal Facility Performed, EPA Oversight) OU 02 - NW PLUME CONTAINMENT 1 03/24/1994 09/28/1995 02
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 03 - NE PLUME CONTAINMENT 1 01/31/1995 06/15/1995 03
Record of Decision (Federal Facility Performed, EPA Oversight) OU 03 - NE PLUME CONTAINMENT 1 06/15/1995 03
Explanation of Significant Differences (Federal Facility Performed, EPA Oversight) OU 03 - NE PLUME CONTAINMENT 1 01/13/2016 03
Remedial Design (Federal Facility Performed, EPA Oversight) OU 03 - NE PLUME CONTAINMENT 1 12/28/1995 12/18/1996 03
Remedial Action (Federal Facility Performed, EPA Oversight) OU 03 - NE PLUME CONTAINMENT 1 05/20/1996 02/26/1997 03
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 05 - WAG 1 & 7 09/10/1992 06/10/1996 05
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 05 - WAG 1 & 7 06/30/1996 08/10/1998 05
Record of Decision (Federal Facility Performed, EPA Oversight) OU 05 - WAG 1 & 7 08/10/1998 05
Remedial Design (Federal Facility Performed, EPA Oversight) OU 05 - WAG 1 & 7 07/03/1997 02/08/1999 05
Remedial Action (Federal Facility Performed, EPA Oversight) OU 05 - WAG 1 & 7 02/08/1999 02/08/1999 05
Feasibility Study (Federal Facility Performed, EPA Oversight) OU 06 - NS DIV DITCH 01/05/2001 03/23/2001 06
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 06 - NS DIV DITCH 03/26/1993 03/28/1994 06
Record of Decision (Federal Facility Performed, EPA Oversight) OU 06 - NS DIV DITCH 03/28/1994 06
Remedial Design (Federal Facility Performed, EPA Oversight) OU 06 - NS DIV DITCH 07/18/1994 01/12/1995 06
Remedial Action (Federal Facility Performed, EPA Oversight) OU 06 - NS DIV DITCH 03/27/1995 01/30/1996 06
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 07 - WAG 13 07/09/1993 12/31/1999 07
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 08 - WAG 22 BURIAL GROUNDS 04/10/1989 08/22/1995 08
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 08 - WAG 22 BURIAL GROUNDS 03/29/1995 08
Record of Decision (Federal Facility Performed, EPA Oversight) OU 08 - WAG 22 BURIAL GROUNDS 08/22/1995 08
Remedial Design (Federal Facility Performed, EPA Oversight) OU 08 - WAG 22 BURIAL GROUNDS 08/31/1995 06/17/1996 08
Removal (Federal Facility Performed, EPA Oversight) OU 09 - WAG 23 PCB SPILL 12/29/1997 06/08/1998 09
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 09 - WAG 23 PCB SPILL 10/25/1994 07/12/1996 09
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 12 - WAG 17 01/28/1994 09/29/1997 12
Record of Decision (Federal Facility Performed, EPA Oversight) OU 12 - WAG 17 09/29/1997 12
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 13 - WAG 6 07/25/1994 03/14/1997 13
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 13 - WAG 6 09/13/1995 02/08/1999 13
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 15 - WAG 27 05/15/1994 07/07/1997 15
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 15 - WAG 27 11/14/1996 06/30/2001 15
Record of Decision (Federal Facility Performed, EPA Oversight) OU 15 - WAG 27 08/10/1998 15
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 16 - WAG 28 08/02/1997 06/30/2001 16
Removal (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 12/30/1999 09/15/2000 18
Removal (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 04/16/2009 09/27/2010 18
Remedial Investigation (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 07/30/2005 01/29/2008 18
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 04/27/1993 07/11/2011* 18
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 07/11/2011 18
Record of Decision (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 08/21/2002 18
Remedial Design (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 10/15/2002 10/15/2002 18
Remedial Design (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 09/12/2003 02/03/2004 18
Remedial Action (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 10/15/2002 10/15/2002 18
Remedial Action (Federal Facility Performed, EPA Oversight) OU 18 - SURFACE WATER OPERABLE UNIT 09/12/2003 09/26/2005 18
Feasibility Study (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 11/30/2000 03/15/2004 19
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 10/24/2004 03/20/2012 19
Proposed Plan (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 08/09/2004 08/09/2004 19
Proposed Plan (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 09/26/2011 09/26/2011 19
Record of Decision (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 08/09/2005 19
Record of Decision (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 03/20/2012 19
Remedial Design (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 08/30/2005 07/09/2008 19
Remedial Design (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 08/18/2006 12/23/2019 19
Remedial Action (Federal Facility Performed, EPA Oversight) OU 19 - GROUNDWATER OPERABLE UNIT 08/19/2008 07/30/2018 19
Remedial Action OU 19 - GROUNDWATER OPERABLE UNIT Estimated Jun - Aug 2020 Estimated Jun - Aug 2021 19
Removal (Federal Facility Performed, EPA Oversight) OU 20 - D & D OPERABLE UNIT 08/08/2002 08/19/2002 20
Removal (Federal Facility Performed, EPA Oversight) OU 20 - D & D OPERABLE UNIT 11/23/2009 04/11/2016 20
Removal (Federal Facility Performed, EPA Oversight) OU 20 - D & D OPERABLE UNIT 03/30/2010 05/15/2014 20
Remedial Design (Federal Facility Performed, EPA Oversight) OU 20 - D & D OPERABLE UNIT 06/17/2002 03/19/2003 20
Removal (Federal Facility Performed, EPA Oversight) OU 21 - SOILS OPERABLE UNIT 05/11/2009 03/22/2010 21
Feasibility Study (Federal Facility Performed, EPA Oversight) OU 22 - BURIAL GROUNDS OPERABLE UNIT 04/30/2012 22
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 22 - BURIAL GROUNDS OPERABLE UNIT 01/09/2007 22
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 22 - BURIAL GROUNDS OPERABLE UNIT 10/28/2011 22
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 22 - BURIAL GROUNDS OPERABLE UNIT 12/20/2011 22
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 23 - CERCLA WASTE DISPOSAL ALTERNATIVES 09/27/2011 23
Combined Remedial Investigation/Feasibility Study (Federal Facility Performed, EPA Oversight) OU 24 - C-400 COMPLEX 11/19/2018 24

*NOTE: This date may not reflect the actual start or actual completion of the milestone. Either the lead for this activity changed, the project was phased, or the project did not fit the normal definitions of activities tracked in this table.

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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