402 Ave. U, Brooklyn, NY 11223

Gravesend

brownfield "vapor intrusion" VOCs

Shephardic Foundation for Torah Studies Project
Site Description[1]
This BCP Application is for remediation and redevelopment of the Foundation for Torah Studies Project, a .22 acre vacant property located on Block 7219 Lot 1 designated by New York City Department of Assessment. This property is located on a commercial street with residential neighborhood. The property directly to the north consists of a 2-story residential building. The property to the south consists of a 3-story residential home. The property directly to the west consists of a 7-story residential and a commercial building. The property directly to the east is vacant. Along Avenue U store fronts are present on the first levels of residential buildings. Historically, the Site was utilized as a Getty service station for approximately 40 years. The service station operated for 40 years before it was converted to an automotive maintenance facility and most recently a synagogue. The USTs associated with the service station were abandoned in place during July 1992. The proposed development will be a 6-story, 10,000 square foot residential building. The building will consist of both condo units and a synagogue. A full cellar will be situated beneath the building. One portion of the site will be an open space capped with asphalt, which will be used as an access area in the rear of the proposed building. Known or suspected contaminants listed are petroleum and volatile organic contaminants (VOCs). These contaminants have impacted the soil, groundwater, sediment and soil gas. An Agreement has been executed by DEC. RAWP has been approved and Remedial Action started on February 25, 2008. Additional remediation is needed to achieve a Track 1 cleanup based on contaminated soil discovered at the bottom of the excavation. A RAWP Addedum was submitted to the Department on 12/19/08. This plan was then subsequently approved on 01/09/09. Remedial activities are on-going at the Site.

Site Environmental Assessment
A remedial investigation conducted in 2007 revealed contamination in all 3 media: soil, groundwater, and soil vapor. VOCs and SVOCs are present in soils at the water table interface and extend from north central portion of the Site between abandoned USTs and Avenue U, to the southern portion of the Site. The total VOC concentrations in soil range from none detected to 632,310 ug/kg. Analytical data suggest that a groundwater plume consisting of dissolved VOCs (xylenes, ethylbenzene) is present beneath the Site and beneath the sidewalls of East 2nd Street. The total VOC concentrations within the groundwater plume range from 12,400 ug/L in the downgradient portion of the site to 201.30 ug/L. Investigations revealed that levels of soil gas are present at the Site and beneath the sidewalls adjacent to the West of the Site, and East 2nd Street. Organic vapors, such as trimethylbenzenes and xylenes, were detected in soil vapor samples. Major on-site vapor constituents include dichlorodifluoromethane (1,860 mcg/m3) and toluene (1,150 mcg/m3). And major off-site vapor contaminants consists of toluene (53.7 mcg/m3). This site has an active Spill # 85-03707 associated with the former Getty service station. The service station operated for 40 years before it was converted to an automotive maintenance facility. 13 USTs were abandoned in-place. A Stipulation Agreement was executed between DEC and Getty Properties, Corp. on March 28, 2006. An active bioremediation program is needed to reduce the contaminant concentrations to acceptable levels within the plume. Also, a vapor barrier, sub-slab active depressurization system as well as an air exchange system are needed to prevent vapors from impacting interior air in new building. An Agreement has been executed by DEC. RAWP has been approved and Remedial Action started on February 25, 2008. Additional remediation is needed to achieve a Track 1 cleanup based on contaminated soil discovered at the bottom of the excavation. A RAWP Addendum, which included ORC injections into the soil and groundwater, was submitted to the Department on 12/19/08. This plan was then subsequently approved on 01/09/09. Remedial activities are on-going at the Site.

Site Health Assessment
Exposures to contaminated groundwater are not expected because the area is served by public water. Exposure to on-site soil is not currently expected because contamination is below the ground surface. The planned remedy calls for excavation of the entire site to the groundwater, after which a building will cover the entire site footprint, thereby preventing future exposures. The presence of petroleum compounds in soil gas indicate a potential for soil vapor intrusion. The on-site building will incorporate a vapor barrier into its construction to minimize the potential for vapor intrusion; however, the potential for vapor intrusion off-site needs to be investigated and assessed.

Contaminants of Concern
Type of Waste Quantity
ETHYLBENZENE UNKNOWN
BENZENE UNKNOWN
XYLENE (MIXED) UNKNOWN
DICHLORODIFLUOROMETHANE UNKNOWN
ETHYLBENZENE UNKNOWN
TOLUENE UNKNOWN
NAPHTHALENE UNKNOWN

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