87-01 69th Avenue & 92-34 Metropolitan Ave, Forest Hills, Queens, NY

Forest Hills

VCP, VOCs, CVOCs, "Vapor Intrusion", SVE, SSDS, brownfield, "middle school", education

Site Description[1][2]  
The site is located in a neighborhood of private residences and commercial and industrial establishments. The site is bordered by the LIRR tracks on the west and the south; by Metropolitan Avenue on the north; and by the residential housing, lumber facility, and NYSDOT asphalt plant on the east. Home Depot, Sports Authority, and Brunswick Bowl facilities are located to the west of the site across LIRR tracks. Groundwater table elevation is about 45-60 feet beneath the ground surface. Groundwater flow direction is towards the southeast. The groundwater flow gradient is very shallow. The on-site source of TCA and PCE was contaminated soil at the northern end of the former Heinz warehouse, the result of a leak in the building’s drain system. Environmental investigations conducted at the site revealed contamination of soil (which has been excavated in August 2000) and groundwater with halogenated hydrocarbons, such as 1,1,1- trichloroethane (1,1,1-TCA), 1,1-dichloroethane (1,1-DCA), tetrachloroethylene (PCE), and 1,1-dichloroethylene (1,1-DCE). The remedy consists of the following: Installation of an air sparging and soil vapor extraction (AS/SVE) system that encompasses the areas of contaminated soils and groundwater beneath the Site; operation of the AS/SVE system to achieve acceptable levels of contaminants (trichloroethane and tetrachloroethylene) in groundwater; monitoring of groundwater and soil gas at the Site during remediation and post remediation to assess the effectiveness of the treatment system; and incorporation of engineering controls, consisting of a flexible vapor membrane barrier and passive ventilation system, into the new schools’ construction plans as an added safeguard against the remote possibility of residual vapors migrating into the buildings. The remedial system has been installed in 2006 and is in operation.

Site Environmental Assessment
Soil: In the past - elevated concentrations of halogenated hydrocarbons were detected in the soil beneath the northwest corner of the former Heinz warehouse. Contaminated soil from this area was excavated and disposed off site in August 2000. Groundwater and soil gas: On-Site groundwater and soil gas are also contaminated as a result of disposal activities. Predominant contaminants are TCA and PCE above Class GA groundwater standards.

Site Health Assessment
The site is contaminated with volatile organic compounds. The groundwater at the site is not used for drinking water or any other purpose (i.e. irrigation) and the area is served by public water, therefore exposure through the ingestion of contaminated groundwater is unlikely. Remedial plans call for a two foot soil cap to be in place across the site and the ballfields will be made of artificial turf on top of one foot of gravel, therefore the exposure through direct contact to soils is unlikely. Installation of vapor barriers and a sub-slab depressurization systems beneath the school building will serve as a preventative measure to minimize the potential for exposures due to soil vapor intrusion.

Contaminants of Concern
Type of Waste Quantity
1,1,1 TCA UNKNOWN
TETRACHLOROETHYLENE (PCE) UNKNOWN

admin, Debra Hall

Power_plant

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