Superfund Information Systems: Site Profile

Superfund Site:

SYLVESTER
NASHUA, NH

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 Not Yet Achieved
Remedy Selected 07/29/1982
Final Remedy Selected 09/22/1983
Remedial Action Started 06/22/1982
Final Remedial Action Started 09/30/1983
Construction Completed 04/08/1992
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 08/28/2019
Site Ready for Reuse and Redevelopment 04/07/2016

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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 07/19/1988 00
Administrative Order of Consent (EPA Performed) OU 00 - SITEWIDE 11/02/1988 00
Consent Decree (EPA Performed) OU 00 - SITEWIDE 08/14/1989 00
Removal (EPA Performed) OU 00 - SITEWIDE 12/11/1980 10/25/1982 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/22/1994 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/30/1999 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/17/2004 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/14/2009 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/04/2014 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 08/28/2019 00
Record of Decision (EPA Performed) OU 01 - SLURRY WALL/CAP 07/29/1982 01
Remedial Design (State Performed) OU 01 - SLURRY WALL/CAP 08/24/1981 12/01/1982 01
Remedial Action (State Performed) OU 01 - SLURRY WALL/CAP 06/22/1982 12/01/1982 01
Feasibility Study (State Performed) OU 02 - SITE EVAL/DISP 07/30/1982 09/22/1983 02
Record of Decision (EPA Performed) OU 02 - SITE EVAL/DISP 09/22/1983 02
Explanation of Significant Differences (EPA Performed) OU 02 - SITE EVAL/DISP 07/10/1990 02
Explanation of Significant Differences (EPA Performed) OU 02 - SITE EVAL/DISP 09/23/2002 02
Remedial Action (State Performed) OU 02 - SITE EVAL/DISP 09/30/1983 04/30/1986 02
Long-Term Response Action (State Performed) OU 02 - SITE EVAL/DISP 04/30/1986 05/19/1997 02
Operation and Maintenance (State Performed) OU 02 - SITE EVAL/DISP 05/19/1997 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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