Superfund Information Systems: Site Profile

Superfund Site:

NYANZA CHEMICAL WASTE DUMP
ASHLAND, MA

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 05/01/1980
Proposed to the National Priorities List 12/30/1982
Finalized on the National Priorities List 09/08/1983
Remedial Investigation Started 01/28/1983
Remedy Selected 09/04/1985
Final Remedy Selected Estimated Sep - Nov 2019
Remedial Action Started 12/31/1987
Construction Completed Estimated Sep - Nov 2020
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 05/13/2014
Site Ready for Reuse and Redevelopment Estimated Sep - Nov 2020

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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 04/29/1987 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 12/12/1997 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 06/22/1998 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 08/01/2000 00
Unilateral Administrative Order (EPA Performed) OU 00 - SITEWIDE 01/08/1993 00
Removal (PRP Performed, EPA Oversight) OU 00 - SITEWIDE 04/21/1987 04/30/1987 00
Removal (EPA Performed) OU 00 - SITEWIDE 05/11/1987 06/10/1988 00
Removal (PRP Performed, EPA Oversight) OU 00 - SITEWIDE 12/11/1988 02/10/1989 00
Removal (EPA Performed) OU 00 - SITEWIDE 05/13/1992 06/18/1992 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 11/10/1993 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 08/17/1999 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 04/12/2004 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 05/13/2009 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 05/13/2014 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE Estimated May - Jul 2019 00
Remedial Investigation (EPA Performed) OU 01 - OU1 SOURCE CONTROL 01/28/1983 08/24/1984* 01
Feasibility Study (EPA Performed) OU 01 - OU1 SOURCE CONTROL 01/28/1983* 09/04/1985 01
Record of Decision (EPA Performed) OU 01 - OU1 SOURCE CONTROL 09/04/1985 01
Explanation of Significant Differences (EPA Performed) OU 01 - OU1 SOURCE CONTROL 09/21/1992 01
Remedial Design (EPA Performed) OU 01 - OU1 SOURCE CONTROL 05/05/1986 12/11/1987 01
Remedial Action (EPA Performed) OU 01 - OU1 SOURCE CONTROL 12/31/1987 09/25/1992 01
Operation and Maintenance (State Performed) OU 01 - OU1 SOURCE CONTROL 09/21/1992 01
Feasibility Study (EPA Performed) OU 02 - OU2 OFF-SITE GW 04/25/2017 Estimated Sep - Nov 2019 02
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 02 - OU2 OFF-SITE GW 05/21/1987 09/23/1991 02
Proposed Plan OU 02 - OU2 OFF-SITE GW Estimated Jul - Sep 2019 Estimated Aug - Oct 2019 02
Record of Decision (EPA Performed) OU 02 - OU2 OFF-SITE GW 09/23/1991 02
Record of Decision OU 02 - OU2 OFF-SITE GW Estimated Sep - Nov 2019 02
Explanation of Significant Differences (EPA Performed) OU 02 - OU2 OFF-SITE GW 09/29/2006 02
Remedial Design (EPA Performed) OU 02 - OU2 OFF-SITE GW 04/08/1992 09/27/2006 02
Remedial Design OU 02 - OU2 OFF-SITE GW Estimated Mar - May 2020 02
Remedial Action (EPA Performed) OU 02 - OU2 OFF-SITE GW 09/27/2006 06/30/2008 02
Remedial Action (EPA Performed) OU 02 - OU2 OFF-SITE GW 09/27/2007 Estimated Oct - Dec 2020 02
Operation and Maintenance (State Performed) OU 02 - OU2 OFF-SITE GW 05/01/2008 02
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 03 - OU3 WETLANDS AND DRAINAGE WAYS 05/21/1987 03/30/1993 03
Record of Decision (EPA Performed) OU 03 - OU3 WETLANDS AND DRAINAGE WAYS 03/30/1993 03
Remedial Design (EPA Performed) OU 03 - OU3 WETLANDS AND DRAINAGE WAYS 07/27/1993 09/28/1998 03
Remedial Action (EPA Performed) OU 03 - OU3 WETLANDS AND DRAINAGE WAYS 09/08/1998 05/30/2002 03
Operation and Maintenance (State Performed) OU 03 - OU3 WETLANDS AND DRAINAGE WAYS 07/23/2003 03
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 04 - OU4 SUDBURY RIVER 02/18/1993 09/30/2010 04
Proposed Plan (EPA Performed) OU 04 - OU4 SUDBURY RIVER 08/09/2016 09/09/2016 04
Record of Decision (EPA Performed) OU 04 - OU4 SUDBURY RIVER 09/30/2010 04
Explanation of Significant Differences (EPA Performed) OU 04 - OU4 SUDBURY RIVER 09/26/2016 04
Remedial Design (EPA Performed) OU 04 - OU4 SUDBURY RIVER 12/14/2010 04/03/2013 04
Remedial Action (EPA Performed) OU 04 - OU4 SUDBURY RIVER 09/24/2014 09/21/2017 04
Operation and Maintenance (State Performed) OU 04 - OU4 SUDBURY RIVER 09/21/2017 04

*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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