1101 Linwood Street, Brooklyn, NY 11208

East New York

VOCs VCP brownfield SSDS "vapor intrusion"

Site Description[1]
The site is located within a commercial / industrial area. The property consists of a one-story warehouse-like industrial facility with a paved parking lot and some landscaping at the southern end. A portion of the building was converted into a two-story facility within the existing building. The current use of the property is a self-storage facility where people can drive vehicles into the building. There are residences one block upgradient. Down gradient from the site is an undeveloped field, the Pennsylvania Avenue Landfill (224002) and the Fountain Avenue Landfill (224003) and then Jamaica Bay. The site was formerly owned by Art-Lloyd Metal Products which manufactured various metal products. Part of the manufacturing process included spray-painting the metal parts. Liquid solvents were likely used in the process. In January 2001, two 550 gallon USTs were discovered under the floor buried in concrete. The tanks had leaked and released large quantities of xylene and ethylbenzene in to the soil and groundwater (spill # 01-07758). The tanks and approximately estimated 40 cubic yards (41.8 tons) of contaminated soil was removed from the site to an approved disposal facility. An interim remedial measure was conducted in May 2003 when four groundwater extraction wells were installed in the area of the contaminated groundwater. About 2,150 gallons of contaminated groundwater was collected for off site disposal. An investigation of groundwater, soil, and soil gas began in June 2003. In the winter of 2004-05, approximately 250 cubic yards of contaminated soil was excavated from two locations and disposed of in accordance with NYSDEC regulations. NYSDEC staff requested an oxygen releasing compound (ORC) be pumped in to the excavations, but this was not done. In January 2006, the consultant pumped ORC into the area of the outside excavations using a direct-push method to bore holes to a depth below the earlier excavations. Due to elevated concentrations of xylene and ethelbenzene in soil gas and impacts to indoor air, a sub-slab depressurization system (SSDS) was installed in November 2005. The environmental remedies conducted at the site are summarized in the Interim Remedial Measures Work Plan, May 20, 2003; Remedial Action Work Plan, April 9, 2004; and the Additional Remedial Action Work Plan, November 2005 from Shapiro Engineering. Due to the remaining contamination, engineering controls (ECs) and institutional controls (ICs) have been placed on the site. The ECs consist of operation and maintenance of the SSDS, periodic groundwater monitoring, a demarcation barrier at the depth limit of the source excavation. ICs prohibit excavation of soil without DEC approval and the use of on-site groundwater for potable purposes. Upon completion of the VCA in July 2007, environmental remediation has been completed to the satisfaction of the department.

Site Environmental Assessment
Ethylbenzene and xylene contamination remain in soil and groundwater. The soil contamination is beneath a demarcation barrier, twelve feet of clean fill, and either the sidewalk or concrete floor. The contaminated groundwater flows south beneath the building toward the Penn and Fountain landfills and then the Jamaica Bay. RI sampling has shown that the groundwater contamination has not migrated more than 200 feet in twenty years. A monitoring well was constructed at the other end of the building. No site-related contaminants were found in the well in January 2006. The post-remedy annual report / OM&M report (2006) showed residual contamination of xylene (246 mg/Kg), ethylbenzene (29.1 mg/Kg), and toluene (0.2 mg/Kg) remaining in soil below the bottom of the excavation. The GW concentrations remain elevated in the source area at xylene (43,400 mg/Kg), ethylbenzene (6,590 mg/Kg), and toluene (38.1 mg/Kg). However, most of the source area is under the building and the impacted groundwater is migrating under the building. Two down-gradient monitoring wells showed some impacts from xylene at 3.45 mg/Kg and 14.8 mg/Kg. The residual soil contamination is primarily 12 feet below grade under the sidewalk and the building slab. The soil concentrations exceed TAGM 4046 RSCOs. However, the xylene concentrations are below Part 375 commercial restricted use soil cleanup objective and the ethylbenzene concentrations are below the Part 375 residential restricted use SCO. The remaining GW contamination is primarily under the building. The source area is along the east-northeast side of the building. GW flows southernly under the building. Currently, there are no GW receptors down gradient.

Site Health Assessment
Exposure to contaminants in on-site soil is not expected since remaining wastes are at depth and capped. A sub-slab depressurization system is operating to eliminate or minimize the possibility of vapors entering the on-site building. Exposure to site-related contamination in drinking water is not expected since the area is served by municipal water.

Contaminants of Concern
Type os Waste Quantity
ETHYLBENZENE UNKNOWN
TOLUENE UNKNOWN
XYLENE (MIXED) UNKNOWN

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