Remedial Action Plan - Rochford Field - Newhall Remediation Project

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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). 1
The 4.84 acre Rochford Field is a large grassy area that occupies the block bordered by Newhall and Newbury Streets to the west and south, respectively; Winchester Avenue to the east and Mill Rock Road to the north. A chain link fence surrounds the recreational facility, which includes baseball fields, dugouts, backstops, and bleachers. A concrete sidewalk surrounds the outer edge of the property. Groundwater underlying the subject site was historically classified as “GAA” by CTDEEP; a “GAA” classification indicates that the water resource is regulated for potential use as a public drinking water supply. In 2005, CTDEEP reclassified a portion of the property “GB”; a “GB” classification indicates that the water resource is not intended to be suitable for use as a drinking water supply without prior treatment. Both the “GAA” and “GB” groundwater classification areas are shown on Figures 2A and 2B. A public water supply system is used to supply potable water to area residences and businesses. 1.3 Overview of Investigations In 2001, Haley & Aldrich performed a Phase I Environmental Site Assessment (Phase I ESA) of the Hamden Middle School and surrounding Newhall Street Neighborhood, which included Rochford Field and Mill Rock Park. The purpose of the Phase I ESA was to evaluate site history, existing observable conditions, current site use, and current and historic uses of surrounding properties to identify the potential presence of Recognized Environmental Conditions (RECs). During the Phase I, Haley & Aldrich identified several RECs and contaminants of concern (COC) for the subject site. These RECs and COCs are detailed in our April 2002 “Report on ASTM Phase I Environmental Site Assessment Hamden Middle School and Surrounding Newhall Street Neighborhood, Hamden, Connecticut” In addition to Haley & Aldrich’s 2001 Phase I ESA, CTDEEP and Metcalf & Eddy (M&E) conducted environmental evaluations of Rochford Field for the Town of Hamden between 2000 and 2001. The previous assessments are described in detail in the Haley & Aldrich Phase I ESA report and briefly summarized below. Locations of the previous explorations are shown on Figures 2A and 2B. In December 2000, CTDEEP drilled 14 geoprobe explorations in Rochford Field (SS-21 through SS-34) to depths ranging from 4 to 12 ft below grade; temporary microwells (SS-21, SS-24, SS-27 and SS-30) were installed in four of the explorations. CTDEEP submitted composite soil samples (0 to 4 ft depth) for chemical analysis for extractable total petroleum hydrocarbons (ETPH), total lead, arsenic, thallium and mercury, leachable metals (by SPLP) and semi volatile organic compounds (SVOCs). Groundwater grab samples from microwells SS-21 and SS-27 were tested for cyanide, volatile organic compounds (VOCs), SVOCs, and metals. In January 2001, CTDEEP collected 14 additional shallow (0 to 6 inches) soil samples (RF-21 through RF-34) from the same locations as SS-21 to SS-34 (December 2000). In March 2001, CTDEEP conducted additional chemical testing of shallow soil samples for arsenic at locations designated RF-35 to RF-44. CTDEEP also collected shallow soil samples (0 to 2 inches and 2 to 6 inches depth) from 20 locations (RF-45 to RF-64) for screening using X-ray Fluorescence (XRF) and laboratory analysis for arsenic (0 to 2 inch depths only). 2
Page 1 and 2: REMEDIAL ACTION PLAN ROCHFORD FIELD
Page 3 and 4: TABLE OF CONTENTS LIST OF TABLES LI
Page 5: LIST OF TABLES Table No. Ia Ib IIa
Page 9 and 10: levels of VOCs; cyanide was detecte
Page 11 and 12: 2. CONCEPTUAL SITE MODEL 2.1 Genera
Page 13 and 14: groundwater flow patterns and obser
Page 15 and 16: presence of the oil scrap metal cor
Page 17 and 18: On-site soil washing Bioremediation
Page 19 and 20: 3.4 CTDEEP Selected Remedy In 2005,
Page 21 and 22: The depth of the liner and gravel w
Page 23 and 24: The impermeable barrier will be slo
Page 25 and 26: 5. LONG-TERM GROUNDWATER MONITORING
Page 27 and 28: TABLE Ia SUMMARY OF ANALYTICAL RESU
Page 49 and 50: TABLE Ib SUMMARY OF ANALYTICAL RESU
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TABLE Ib SUMMARY OF ANALYTICAL RESU
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TABLE IIa SUMMARY OF ANALYTICAL DAT
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TABLE IIb SUMMARY OF ANALYTICAL DAT
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APPENDIX B Selected Figures from Pr
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NEWHALL ROCHFORD FIELD WINCHESTER A
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BLAKE CIRCLE MILL ROCK ROAD MIDDLE
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TABLE X Page 1 of 3 SUMMARY OF CONC
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TABLE X Page 3 of 3 SUMMARY OF CONC
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Remedial Action Plan - Rochford Field - Newhall Remediation Project

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