Superfund Information Systems: Site Profile

Superfund Site:

HOCOMONCO POND
WESTBOROUGH, 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 10/01/1982
Proposed to the National Priorities List 12/30/1982
Finalized on the National Priorities List 09/08/1983
Remedial Investigation Started 08/18/1983
Final Remedy Selected 09/30/1985
Remedial Action Started 09/28/1989
Final Remedial Action Started 06/02/1993
Construction Completed 09/22/1999
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review 09/19/2019
Site Ready for Reuse and Redevelopment 12/05/2017

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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
Consent Decree (EPA Performed) OU 00 - SITEWIDE 11/10/1987 00
Unilateral Administrative Order (EPA Performed) OU 00 - SITEWIDE 05/30/1986 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/21/2004 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/30/2009 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/25/2014 00
Five-Year Review (EPA Performed) OU 00 - SITEWIDE 09/19/2019 00
Combined Remedial Investigation/Feasibility Study (EPA Performed) OU 01 - INTERIM SOURCE CONTROL 08/18/1983 09/30/1985 01
Record of Decision (EPA Performed) OU 01 - INTERIM SOURCE CONTROL 09/30/1985 01
Explanation of Significant Differences (EPA Performed) OU 01 - INTERIM SOURCE CONTROL 07/22/1992 01
Explanation of Significant Differences (EPA Performed) OU 01 - INTERIM SOURCE CONTROL 09/21/1999 01
Explanation of Significant Differences (EPA Performed) OU 01 - INTERIM SOURCE CONTROL 09/30/2013 01
Remedial Design (PRP Performed, EPA Oversight) OU 01 - INTERIM SOURCE CONTROL 08/07/1987 09/28/1989 01
Remedial Action (PRP Performed, EPA Oversight) OU 01 - INTERIM SOURCE CONTROL 09/28/1989 01/19/1990 01
Remedial Design (PRP Performed, EPA Oversight) OU 02 - LANDFILL & GW TREATMENT 08/07/1987 06/02/1993 02
Remedial Action (PRP Performed, EPA Oversight) OU 02 - LANDFILL & GW TREATMENT 06/02/1993 09/28/2000 02
Long-Term Response Action (PRP Performed, EPA Oversight) OU 02 - LANDFILL & GW TREATMENT 09/28/2000 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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