1199 Sutter Ave, Brooklyn, NY 11208

Cypress Hills

brownfield, CVOCs, VOCs, "Vapor Intrusion"

AAA Sutter Realty LLC
Site Description[1] 
Location: The site is specifically known as 1199-1221 Sutter Avenue in a mixed residential / commercial area of Brooklyn. The site is bounded by Sutter Ave. to the south, Chestnut St. to the east, residential to the north and Crystal St. to the west. Site Features: The site occupies about half of a city block on the north side of Sutter Avenue. An asphalt parking lot covers the northern portion of the site and a single-story building is located along the southern portion of the site. The building is underlain with a basement segmented for each retail/office unit with utilities, storage and service rooms. Current Zoning/Use: The site is within an R5 (residential) zoned area. The site is zoned C1-2 (commercial) as are the properties along the north side of a seven-block stretch of Sutter Avenue. Historic Uses: The structures on the site were constructed in 1957 and were the original development on the property. A dry cleaner establishment formerly occupied the eastern-most unit. The former location of the dry cleaner is presently occupied by a self-service laundromat. Site Geology and Hydrogeology: The property is located within the Pavement and Buildings-Flatbush-Riverhead Series Soil Map Unit, which is described as anthropogenic urban fill overlying glacial out wash deposits and characterized as a sandy loam. The groundwater table is approximately 13 feet below grade and is characterized as Class GA indicating it as a potential source of potable water. Groundwater flows south. Groundwater is not utilized as a source of potable water at site.

Site Environmental Assessment
Nature and Extent of Contamination: A limited Phase II conducted in 2009 found the dry cleaning solvent tetrachloroethene (PCE) and its daughter products trichloroethene (TCE) and cis-1,2-dichloroethene (DCE) at elevated concentrations in groundwater. Permanent monitoring wells were constructed in 2009 and sampled before (August 2009) and after (November 2009) a remedial action consisting of potassium permanganate injections into on-site groundwater. The data are inconclusive as to the effectiveness of the injections. A site characterization investigation was conducted by Associated Environmental Services under NYSDEC oversight in July 2011. PCE and its daughter products remain above groundwater standards in the preexisting monitoring wells constructed during the Phase II investigation. PCE concentrations ranged from below its standard of 5 ppb to a maximum concentration of 470 ppb in MW-4. MW-4 is located in the basement of the former location of the dry cleaner. TCE and DCE were present in some wells and non-detect in others. The new down-gradient monitoring well (MW-5) located across Sutter Avenue had PCE, TCE and DCE at respective concentrations of 98 ppb, 5.2 ppb and 9.8 ppb. The investigation found tetrachloroethene (PCE) and trichloroethene (TCE) in indoor air in the basement of the laundromat (former dry cleaner). Elevated concentrations of PCE, TCE, cis-1,2-dichloroethene (DCE) and vinyl chloride were observed in sub-slab vapor. The indoor air sample had PCE and TCE at 68.5 micrograms per cubic meter (ug/M3) and 1.27 ug/M3 respectively. Respective sub-slab concentrations of PCE, TCE, DCE and vinyl chloride were 428,000 ug/M3, 9,730 ug/M3, 4,220 ug/M3 and 795 ug/M3. The elevated concentrations of these chlorinated VOCs in soil vapor present a significant threat to human health and indicate the presence of an on-site source. Also present in the sub-slab vapor were chloroform, dichloroethene, ethylbenzene, freon 113, styrene and toluene. The highest concentrations of contaminants in groundwater were found in a well constructed in the laundromat. PCE, TCE and DCE were detected at the respective concentrations of 470 parts per billion (ppm), 14 ppb and 4.3 ppb. Soil data are limited, but two soil borings behind the laundromat had PCE and TCE above their respective unrestricted soil cleanup objectives (USCOs) parts per million (ppm). DCE was also detected above its USCO in one boring. However, all were well below the commercial SCOs More soil data are needed for an accurate analysis of soil contamination at the site.

Site Health Assessment
Direct contact with contaminants that may be present in the soil is unlikely because the site is covered with building foundations and concrete pavement. Contaminated groundwater at the site is not used from drinking or other purposes and the site is served by a public water supply that obtains water from a source not affected by this contamination. Volatile organic compounds in the groundwater may move into the soil vapor (air spaces within the soil), which in turn my move into overlying buildings and affect the indoor air quality. This process, which is similar to the movement of radon gas from the subsurface into the indoor air of buildings, is referred to as soil vapor intrusion. Soil vapor intrusion sampling has indicated that mitigation is warranted for the on-site Laundromat. However, indoor air levels of contaminants of concern in the Laundromat are not above guidance values. There is also a potential for vapor intrusion into commercial spaces adjacent to the drycleaner. Additional investigation is warranted to evaluate the potential for off-site vapor intrusion and subsequent exposures in nearby structures.

Contaminants of Concern
Type of Waste Quantity of Waste
DICHLOROETHYLENE UNKNOWN
TETRACHLOROETHYLENE (PCE) UNKNOWN
TRICHLOROETHENE (TCE) UNKNOWN
  1. DEC Environmental Site Remediation Database.  Site Name: "1199 Sutter Avenue"

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