Site Description

The SRSNE Site is located on approximately 14 acres of land along Lazy Lane in Southington, Hartford County, Connecticut, approximately 15 miles southwest of the City of Hartford. The SRSNE facility began operations in Southington in 1955. From approximately 1955 until the facility’s closure in 1991, spent solvents were received from customers and distilled (recycled) to remove impurities, and the recovered solvents were returned to the customer or sold to others for reuse.

Key milestones in the more recent history of the Site, are as follows:

  • 1983: USEPA adds the Site to the Superfund list; SRSNE signs a consent decree with USEPA to install a groundwater recovery system and store/manage hazardous waste on site.
  • 1983-1988: USEPA and the State of Connecticut take enforcement action to require cleanup of the facility operations and the property.
  • 1991: SRSNE operations cease.
  • 1990: USEPA initiates the Remedial Investigation for the Site, conducting three phases of investigation that are presented in a four-volume report (HNUS 1994).
  • 1992: USEPA conducts a Time-Critical Removal Action to remove contaminated soils from the railroad grade drainage ditch and to remove some chemicals stored at the property to an off-site location.
  • 1994: USEPA and the SRSNE Site Group enter into an Administrative Order on Consent (AOC) for Removal Action to construct and operate a pump and treat system to contain the principally contaminated overburden groundwater (the Non-Time-Critical Removal Action # 1 or “NTCRA” work). Other work conducted under this AOC included the construction of a mitigation wetland in the northeast corner of the Cianci Property, implementation of a full-scale phytoremediation study within the NTCRA 1 sheet pile wall, and extension of public water to three buildings adjacent to the Site.
  • NTCRA 1 100% Design
  • 1998 EPA “Cost and Performance Report” on NTCRA 1
  • 1995: USEPA issues an Action Memorandum for a second NTCRA (NTCRA 2) to hydraulically contain VOC-impacted bedrock groundwater downgradient of the NTCRA 1 system.
  • 1996: USEPA and the SRSNE Site Group enter into a second AOC for Removal Action and Remedial Investigation/Feasibility study to expand the groundwater containment system and complete site investigations. Work under this AOC resulted in the completion of the Site RI/FS, implementation of NTCRA 2, and the decontamination, demolition and removal of the remaining buildings and tanks from the Operations Area.
  • 1995 – Present: SRSNE Site Group operates groundwater containment and treatment system for the overburden and bedrock aquifers.
  • 1996 – 2004: SRSNE Site Group completes remedial investigations and conducts feasibility studies.
  • 2005: USEPA issues the proposed remedial action plan in June and holds two public meetings; the public comment period runs from June through August.
  • 2005: USEPA issues the Record of Decision (ROD) for the Site, which describes the final remedy – key elements include:
    • Treating waste oils and solvents in subsurface by heating (“in-situ thermal treatment”)
    • Excavating, consolidating, capping impacted soil and wetland soil onsite
    • Continuing to pump and treat groundwater in the overburden and bedrock aquifers, and continue monitoring groundwater outside the capture zone to verify natural recovery.
    • Placing restrictions on use of Site property and groundwater.
    • Carrying out long-term monitoring of cap and groundwater.
    • Record of Decision
  • 2008: USEPA signs CD with SRSNE Site Group to perform Site-wide cleanup and complete the RD/RA activities, CD lodged with the Court
  • 2009: Court enters CD, Remedial Design Work initiated
  • 2009: 1st Annual State of Compliance Report
  • 2010: 1st Five Year Review Report
  • 2010: USEPA, CTDEEP & SRSNE Site Group host Open House for public to learn about upcoming remedial activities.
  • 2010: USEPA issues Remedial Design Work Plan approval.
  • 2010: USEPA issues approval of PIPP 100% Design RAWP.
  • 2010: Initiated Pre-In Situ Thermal Remediation (ISTR) Preparation Plan construction activities.
  • 2010: 2nd Annual State of Compliance Report
  • 2011: ISTR Conceptual Design approval.
  • 2011: Approval of ISTR 100% Wellfield Design.
  • 2011: 3rd Annual State of Compliance Report
  • 2011: Completed Pre-ISTR Preparation Plan construction activities.
  • 2012: 4th Annual State of Compliance Report

Next Steps:

    • 2013:  Install ISTR wellfield and system
    • September 2013:  USEPA, CTDEEP & SRSNE Site Group host Open House for public to learn about upcoming remedial activities
    • Late 2013:  initiate ISTR operations
    • Mid 2014:  Complete ISTR operations
    • Late 2014:  Demobilize ISTR system
    • 2015:  Perform Second Five-Year Review, design cap system
    • 2016:  Install cap, start design of long-term groundwater treatment system