West Side Corporation Site
History of Site
Groundwater extraction well drilling
This 4.5-acre site is owned by the now defunct West Side Corporation. It is surrounded by a combination of industrial, commercial, and residential properties. From about 1969 to 1992, the site was used as a storage and distribution center for dry-cleaning supplies, including large quantities of tetrachloroethene (PCE). Soil and groundwater at the site are contaminated with PCE. A plume of contaminated groundwater is extending from the site in a south-southwest direction.
The New York City Department of Environmental Protection (NYCDEP) has voluntarily assisted DEC in remediating the offsite groundwater plume because they have a mutual interest in achieving the objectives of the implemented remedy: to protect the local aquifer which may be used in the future to supplement the NYC public water supply. Specifically, the NYCDEP designed and constructed the off-site groundwater (Operable Unit No. 2) remedy. Funding for the design and construction of the OU2 remedy initially came from the NYCDEP and now is being reimbursed by DEC under a State Assistance Contract. The NYCDEP continues to study the possibility of restarting several groundwater production wells located in Southeast Queens to provide a future source of potable water. Restarting these wells may also address flooding problems from a rising water table in the area.
Groundwater treatment system
Operable Unit No. 1 (OU1)
On July 31, 2000, DEC signed a Record of Decision (ROD) which selected a remedy to clean up the soil and groundwater on the site itself. In September 2002, an Explanation of Significant Differences (ESD) was issued by DEC revising the OU1 remedy. Specifically, contamination was to be treated in-place using electrical resistive heating (ERH) and soil vapor extraction (SVE) technologies to greatly reduce the amount of PCE in soil and groundwater. DEC will also seek to impose restrictions on the use of the site to ensure the long-term effectiveness of the on-site remedy.
Operable Unit No. 2 (OU2)
A second ROD was signed in February 2002 that addressed contaminated groundwater that has moved from the site to the south-southwest. To hydraulically contain the plume, the NYCDEP installed two recovery wells on the adjacent NYCDEP property known as Station 24, treating the extracted water with activated carbon and discharging the treated water to Bergen Basin through the sewer system under permit . The system was designed to pump and treat up to 2.9 million gallons per day. Construction of this system was completed by the NYCDEP in May 2012.
Operable Unit No. 3 (OU3)
Elevated levels of PCE were found in soil gas at various locations within the groundwater plume. DEC is currently undertaking a Soil Vapor Intrusion (SVI) study within the residential area located south-southwest of the site. The SVI study will continue until DEC, in consultation with the NYS Department of Health (NYSDOH), determines that further testing is not needed.
- August 1997 - The site was classified by the DEC as a Class 2 inactive hazardous waste site designation.
- July 2000 - ROD signed by DEC for OU1 (onsite soils and groundwater).
- February 2002 - ROD signed by DEC for OU2 (off-site groundwater).
- June 2004 - Remedial Design for OU1 completed by DEC.
- November 2004 - Remedial Construction for OU1 initiated by DEC.
- May 2005 - Soil Vapor Intrusion Study (OU3) initiated by DEC and NYSDOH.
- December 2005 - ERH treatment completed/SVE treatment initiated for OU1.
- February 2007 - Remedial Design for OU2 completed by the NYCDEP.
- March 2009 - OU2 remedial action initiated by NYCDEP.
- June 2011 - OU1 soils remediation completed. Onsite groundwater studies initiated.
- May 2012 - OU2 RA construction completion by NYCDEP.
- June 2012 - DEC takes over future OU2 site management responsibilities from NYCDEP.
- July 2012 thru November 2012 - OU2 treatment system optimization operations complete.
- December 2012 - DEC suspends OU2 treatment system operations.
- October 2013 - DEC releases OU2 Proposed Amended Record of Decision for public comment.
Operable Unit 1 (on-site soils/groundwater): Design of the on-site cleanup was completed in June 2004. Remedial construction of the ERH/SVE treatment system was initiated in November 2004 and completed in early December 2005. Power up of the ERH treatment system was initiated in December 2005. ERH operation and confirmation of successful performance was completed in April 2006. SVE treatment system operations were completed in June 2011. Additional investigation and remediation of residual VOCs in onsite groundwater is ongoing. An in-situ pilot study utilizing chemical reagents was initiated in Spring 2012 and continues.
Operable Unit 2 (off-site groundwater): Groundwater treatment system operation was completed in November 2012 by DEC. During operation the focus was on system optimization and satisfactorily demonstrating that the system was operating as designed. Site work was suspended at the end of November 2012 to allow a detailed engineering analysis of monitoring data collected during the 3 month evaluation period.
Following data evaluation, DEC is now proposing to amend the OU2 ROD to include chemical injections in the shallow and intermediate groundwater zones and eliminate operation of the Ground Water Extraction and Treatment system. This is a fundamental change to the remedy selected in the previous ROD, but is a more streamlined and effective approach to removing the remaining contaminant mass in the groundwater. DEC will consider public comments as it revises the remedy for the site. The amended remedy will be described in a document called an "Amended Record of Decision" that will explain why the amended remedy was selected and respond to public comments. A detailed design of the remedy will then be prepared, and the cleanup will be performed.
Operable Unit 3 (soil vapor): Since May 2005, DEC and the New York State Department of Health (NYSDOH) have tested soil gas and the air in and surrounding over 120 homes near the former West Side facility to monitor the effects of vapor intrusion. As a result, DEC has installed sub-slab depressurization systems in twenty-nine (29) homes to date.
- Continue on with the OU1 groundwater pilot study.
- Conduct public meeting on OU2 Proposed Amended Record of Decision.
- Respond to public comments and release Amended Record of Decision.
- Initiate the remedial design for OU2 groundwater treatment using insitu chemical oxidation technology.
- Continue with SVI study and mitigation of impacted structures as necessary.
For Technical Questions:
Dave J. Chiusano, Project Manager (OU1/OU2)
Eric Hausaman, Project Manager (OU3)
Division of Environmental Remediation
625 Broadway, 12th Floor
Albany, New York 12233-7017
For Health Related Questions:
Ms. Stephanie Selmer
NYS Department of Health
547 River Street, Flanigan Square
Troy, NY 12180-2216
518-402-7870 or 800-458-1158 ext. 27870