Farrington St at 32nd St, Flushing, Queens, NY 11354

Flushing

Superfund MGP VOCs CVOCs "Vapor Intrusion"

ConEd and Feinrose Assoc.
Site Description[1] 
The site occupies an area of approximately 1.1 acres and is located at the corner of Farrington Street and 32nd Street in Flushing, Queens County, New York. The site is located in both a residential and industrial area bounded by a recycling paper plant building and several commercial buildings to the north by Linden Place on the east, by 32nd Avenue on the south and by Farrington Street on the west. There is a warehouse on 32nd Avenue and residences on Linden Place. Most of the site was either covered by old concrete in the area of the former gas holder or by gravel and asphalt. The site is enclosed by a 10-foot high chain link security fence and contains various sheds, trailers, storage and parking areas. Con Edison currently uses the western half of the site as a flush truck facility with a wastewater treatment system in support of its flush truck operations. Between 1924 and 1976, the site was occupied by a three million cubic foot waterless gasholder and related equipment and structures. The holder was initially associated with a manufactured gas plant (MGP) that Con Edison and its predecessor, the New York & Queens Gas Company (NY&QGC) operated on a property located to the west of the site. After the MGP was retired in 1944, the holder on the Site was used for the storage of gas that was produced at other Con Edison plants or purchased from other utilities. A PSA was completed in 2001, and an IRM work plan was approved in 2002. The IRM activities were conducted between Novembeer 2002 and March 2003. An IRM completion report was approved in Sept 2003 and the Site Management Plan was approved in December 2005. Soil gas sampling was performed in February 2006, which revealed the presence of an off-site source of chlorinated solvents in soil vapor and groundwater. This was referred for additional investigation. Post-IRM Groundwater sampling continues on a semi-annual basis.

Site Environmental Assessment
The primary contaminants of concern remaining at the site include VOCs and PAHs. A total of 110 post-excavation samples were collected and submitted for laboratory analysis. The sample results indicate that all detected VOC and PAH concentrations were less than the soil cleanup objectives with the exception of seven samples in areas where additional excavation was impractical. Groundwater contaminant concentrations are decreasing when comparing 2001 data to 2004. Exceedances of standards, criteria and guidance include trichloroethene (7.4ppb), tetrachloroethene (67ppb), 1,2-dichloroethene (7.5ppb) these contaminants are not associated with the former MGP processes. Associated site contaminants include total BTEX (90.7ppb) and total SVOCs (44.4ppb).

Site Health Assessment
Soil and groundwater at this site are contaminated with manufactured gas plant (MGP) waste and petroleum-based compounds. Human exposures to contaminated soil and groundwater are unlikely. Most of the contaminated soil has been removed, the site is fenced, and the surrounding area is served by a public water supply. An off-site chlorinated solvent groundwater and soil vapor plume is migrating on-site. Inhalation is a potential exposure pathway if buildings are constructed on-site in the future.

admin, Debra Hall

Power_plant

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