86-15 Rockaway Beach Boulevard, Rockaway, NY 11694


Superfund VOCs CVOCs "Vapor Intrusion" SSDS

Rockaway Commons and Dayton Towers Corp.
Site Description[1] 
The site is currently operating as a dry cleaning establishment, located in a shopping complex with a supermarket, a medical center and different other stores. A Phase II Investigation was performed in the vicinity of the London French Cleaners in early 2000. This investigation revealed high levels of tetrachloroethene (PCE), trichloroethene (TCE), cis1,2-dichloroethene (DCE) and vinyl chloride in the groundwater beneath the site. An air sparging/soil vapor extraction (AS/SVE)system had been installed in the Fall of 2000 and was returned to operation in January 2005 after several years of disuse. Indoor air samples taken in December 2004 indicated elevated indoor air concentrations in nearby businesses. Remedial actions will likely be required, possibly including an expansion of the existing AS/SVE system. An SI/RA report was submitted in October 2005 recommending a remedy of the installation of a sub-slab venting system and continued operation of the existing air sparge/SVE system. However, the submittal needed revision, so it was decided to install the sub-slab venting system as an IRM to expedite it's installation without having to wait for the PRAP/ROD process to be completed. After the successful IRM, a no further action/ continued monitoring and operation of the IRM remedy Record of Decision was finalized in July 2007. A site management plan was completed in January 2009.

Site Environmental Assessment
Past operations on the site have contaminated the groundwater with hazardous levels of chlorinated solvents. A dry cleaner operating at the site resulted in releases of tetrachroethene (PCE) due to sub-standard handing processes. These releases impacted soil, groundwater, and soils vapor at the site.

Site Health Assessment
Groundwater is contaminated with tetrachloroethene (PCE) and trichloroethene (TCE). All drinking water for residents living near the site is provided by upstate water supplies so exposure to contaminated groundwater is not expected. Exposure to contaminated soil is not expected since the site is covered by buildings and is paved. An indoor air and soil vapor investigation identified a completed vapor intrusion exposure pathway in neighboring tenant spaces of the strip mall. To remedy this, the existing soil vapor extraction system was restarted and sub-slab depressurization systems were installed in the adjacent tenant spaces. The remedial investigation has determined that the extent of contamination in groundwater and soil are below the site and it was demonstrated that the contamination is not beyond the site border.

admin, Debra Hall



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