The New York State Department of Environmental Conservation (DEC) will hold a public meeting on Wednesday July 27, at 7 p.m. to present its proposal for the cleanup of environmental contamination at the former Munsey Cleaners Inactive Hazardous Waste Disposal Site. The meeting will be held at the Port Washington Public Library located on 1 Library Drive, Port Washington. At the meeting, DEC and New York State Department of Health (NYSDOH) staff will review the history of the site, describe the results of investigations completed to date, and the rationale behind the Proposed Remedial Action Plan (PRAP).
The site is located at 1029 Port Washington Boulevard, near the southeast corner of the intersection of Port Washington Boulevard and Main Street in a one-story shopping plaza. The site is a commercial building constructed in 1947 and was used for dry cleaning operations until 1994. The past disposal of hazardous waste at the site has contaminated soil, indoor air and groundwater. The major contaminant found at the site is the dry cleaning compound perchloroethylene (PCE).
The site has been divided into two Operable Units (OU). An operable unit represents a portion of the site remedy that for technical or administrative reasons can be addressed separately to eliminate or mitigate a release, threat of release or exposure pathway resulting from the site contamination. Operable Unit One (OU-1), which is the subject of the PRAP and the July 27 public meeting, consists of on-site soil and groundwater. Operable Unit Two (OU-2) consists of the off-site groundwater contamination emanating from the site, which co-mingles with the Plaza Cleaners Site groundwater plume and will be addressed as a separate project.
A Remedial Investigation (RI) of this site was conducted in two phases. The Phase I RI was conducted between October 2000 and June 2001. The Phase II RI was conducted between August 2002 and June 2003.
The RI included the following activities:
* Installation of fifteen (15) soil borings and six (6) monitoring wells for analysis of soils and groundwater as well as physical properties of soil and hydrogeologic conditions;
* Sampling of six (6) new and four (4) existing monitoring wells;
* Collection of ten (10) sub-slab vapor samples. Collection of 13 rounds of six (6) indoor air samples since August 2000.
The RI data indicates that PCE was detected in soil, groundwater and indoor air at concentrations above New York State's Standards, Criteria and Guidance (SCG) values.
Based on the results of the initial RI, several Interim Remedial Measures (IRM) were conducted at the site. An IRM is conducted at a site when a source of contamination or exposure pathway can be effectively addressed before completion of the RI. The following IRMs were implemented at the site to address the soil, groundwater and indoor air contamination found at the site:
* A soil removal IRM implemented in 1996 removed contaminated soil from the basement of the site.
* A Soil Vapor Extraction System (SVE) was installed in the building's basement after the soil removal action was completed.
* A positive pressure ventilation system was installed in October 2000 which has significantly reduced the concentration of PCE in indoor air.
* The existing SVE system was re-started in July 2003 and operated continuously until November 2004.
* A sub-slab depressurization system was installed at the site in November 2004.
* The SVE system was turned off in November 2004 to determine the effectiveness of the sub-slab depressurization system. Since the sub-slab depressurization system was found to be performing satisfactorily, on May 12, 2005, the SVE system was restarted. Additional reduction in the levels of PCE in indoor air is expected due to the operation of this system.
The DEC and the NYSDOH believe that the IRMs have accomplished the remediation goals for OU-1 provided that the SVE and sub-slab systems continue to be operated and maintained in a manner consistent with the design. Based on the results of the investigation at the site and the IRMs that have been performed, the DEC and the NYSDOH are proposing No Further Action with continued operation of the SVE and sub-slab systems as the preferred alternative for the remediation of OU-1.
Future activities for the OU-1 include the preparation of a Site Management Plan (SMP) to include Operation, Maintenance and Monitoring (OM&M) for the SVE and sub-slab depressurization systems. Indoor air and groundwater sampling would be done on a periodic basis. If it is determined from the review of the indoor air and groundwater sampling results that additional measures are required to improve the effectiveness of the systems, then the measures would be implemented. The measures may include the installation of additional extraction points for soil vapor in the areas of concern and/or the installation of new monitoring wells.
Meeting participants will be given the opportunity to ask questions and provide comments on the proposed cleanup plan. Written comments also may be submitted by Aug. 16, to: Vivek Nattanmai P.E., Project Manager, NYSDEC, Division of Environmental Remediation, 625 Broadway, Albany, New York 12233-7013. Once the public comment period closes, DEC will document and respond to comments and outline the chosen remedy in a Record of Decision (ROD). Copies of investigation reports and other site documents are available at the Port Washington Public Library, and at DEC's regional office in Stony Brook. Information is also available by calling Bill Fonda at (631) 444-0350.