Remedial Action Plan - Rochford Field - Newhall Remediation Project

1. INTRODUCTION
Haley & Aldrich has prepared this Remedial Action Plan (RAP) for Rochford Field, located east of
Newhall Street in Hamden, Connecticut (herein referred to as the “subject site”).
1.1 Background
On 10 July 2001, Connecticut Department of Energy and Environmental Protection (CTDEEP),
formerly known as the Connecticut Department of Environmental Protection (CTDEP), issued Order
No. SRD-128 to: the Town of Hamden, South Central Regional Water Authority (RWA), Olin
Corporation (Olin), and the State Board of Education. The Order required the respondents to
investigate and remediate sources of pollution on a “site” which was subsequently divided into three
portions that included both publicly and privately owned properties. The Order was appealed by all
parties and Consent Order SRD-128 was entered on 16 April 2003. The Consent Order requires the
Town of Hamden to investigate, characterize, and remediate Rochford Field, Mill Rock Park, and the
Sewer Pump Station located at the southeast corner of Mill Rock Road and Winchester Avenue. In
addition, the Consent Order requires that CTDEEP and the Town of Hamden, together, will seek funds
from the State of Connecticut for the investigation and remediation of Rochford Field. A copy of the
Consent Order is included in Appendix A.
On behalf of the Town of Hamden, Haley & Aldrich performed a Phase II and III Environmental
Investigation of Rochford Field and Mill Rock Park (Phase II/III) during the summer and fall 2002.
The results of this investigation can be found in our report entitled “Phase II and III Environmental
Investigations, Rochford Field and Mill Rock Park, Hamden, Connecticut”, dated December 2002.
Long-term quarterly groundwater monitoring of wells in Rochford Field and Mill Park began in April
2003. On 8 June 2004, CTDEEP issued a letter indicating that additional investigation of the study
area was required. On 12 July 2004, a Supplemental Phase III Investigation Work Plan for Rochford
Field and Mill Rock Park (Work Plan) was submitted to the CTDEEP for review and approval. On
14 October 2004, CTDEEP conditionally approved the Work Plan. Haley & Aldrich commenced work
on the Supplemental Phase III investigation late October 2004. Results of the Supplemental Phase III
investigation can be found in our report entitled “Supplemental Phase III Data Investigation and
Preliminary Remedial Action Plan Mill Rock Park, Sewer Pump Station, and Rochford Field, Hamden,
Connecticut,” dated 29 April 2005 and in a subsequent Addendum to the report entitled “Supplemental
Phase III Data Investigation Report Addendum, Mill Rock Park, Sewer Pump Station, and Rochford
Field, Hamden, Connecticut,” dated 11 October 2005.
In August 2006, CTDEEP issued a Proposed Remedy Selection Plan and solicited public comment.
After consideration of the public comment, the proposed Remedy Selection Plan was revised and a
“Remedy Selection Plan”, approved by the CTDEEP Commissioner was published in October 2007.
This RAP details the remedial actions that will be conducted at Rochford Field in accordance with
approved CTDEEP remedy. A separate RAP has been prepared for Mill Rock Park and the Sewer
Pump Station.
1.2 Site Description
The subject site includes the publicly owned property known as Rochford Field, located east of Newhall
Street in Hamden, Connecticut (see Figure 1: Project Locus).
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