383 East 162nd St, Bronx, 10451


brownfield, CVOCs, VOCs, "Vapor Intrusion"

Site Description[1] 
Location: The Courtlandt Crescent site is located at 383 East 162nd Street, Bronx in an urban area. The site is comprised of 10 contiguous lots totaling 0.91 acres located along East 163rd Street, East 162nd Street, Melrose Avenue, and Courtlandt Avenue. Site Features: The site currently contains a vacant two-story industrial building, vacant one-story commercial building, vacant three-story residential building, and seven undeveloped lots with either an asphalt paved surface or a concrete, brick and grass mixed surface. The three structures were deemed unsafe and the Applicant is proceeding with the asbestos abatement and demolition. Current Zoning/Use(s): A zoning change under NYC's Uniform Land Use Review Procedure (ULURP) process commenced on November 3, 2010 and was approved in April 2011. The zoning change rezoned the Site from an R7-2 District to R7A and R8 Districts, and established a C1-4 overlay within the R8 District, which will allow a mixed use residential/commercial development. Historical Uses(s): The site was developed with a filling station from 1951 through 1969, an auto repair shop from 1965 through 1984, and from 1991 through 1993, a machine shop in 1951, an auto junkyard from 1984 through 1988, an iron works from 1993 through 2007, boiler repair shop from 2000 to 2005, brass fabricator shop in 2000, universal machinery manufacturing, waste paper company and cosmetics company in 1927, and a saw works in 1993. Site Geology and Hydrogeology: According to the Surficial Geologic Map of New York, the subsurface soil is composed of poorly sorted glacial till with a variable thickness of up to approximately 1 to 50 meters. According to the Geologic Map of New York Lower Hudson Street, the underlying bedrock is composed of Inwood Marble from the Cambrian era. The Site elevation ranges from 18 to 25 feet above mean sea level based on the Borough of the Bronx Datum. The Site is relatively level with a gradual slope to the northeast along Courtlandt Avenue, and has no natural or artificial surface water bodies or impoundments. Water from rain events runs off into street storm drains. The uppermost groundwater surface occurs at a depth ranging from 13 to 14 feet below sidewalk grade within the unconsolidated materials. The regional direction of groundwater flow is believed to be southerly towards the confluence of the Harlem and East Rivers. Based on Site-specific groundwater elevation data groundwater flows in a northeasterly direction under the Site, most likely due to influences from a gradual elevation change. Groundwater in this area of the Bronx is not used for potable supply purposes, and no potable resources are threatened by local groundwater contamination. The Department executed the Brownfield Cleanup Agreement for this site on May 11, 2011.

Summary of Project Completion Dates
Projects associated with this site are listed in the Project Completion Dates table and are grouped by Operable Unit (OU). A site can be divided into a number of operable units depending on the complexity of the site and the number of issues associated with a site. Sites are often divided into operable units based on the media to be addressed (such as groundwater or contaminated soil), geographic area, or other factors.

Site Environmental Assessment
Nature and Extent of Contamination: Based on the investigations conducted to date, known contaminants including chlorinated solvents, semi-volatile organic compounds (SVOCs), metals, pesticides and other volatile organic compounds (VOCs) are present in the subsurface. These contaminants are impacting soil, groundwater, and soil vapor. Previous investigations included a Phase I Environmental Site Assessment and a Remedial Investigation. Soil: No volatile organic compounds (VOCs) were detected in soil exceeding their respective standards, criteria or guidance (SCGs). The SVOCs detected in soil samples include chrysene, benzo(a)anthracene, and benzo(b)fluoranthene. The concentrations ranged from 1.17 to 7.31 ppm for chrysene (1 ppm unrestricted); from 1.48 to 7.52 ppm for benzo(a)anthracene (1 ppm unrestricted); from 1.29 to 5.82 ppm for benzo(a)fluoranthene (1 ppm unrestricted). The concentration of lead detected ranged from 135 to 43,800 ppm (400 ppm unrestricted). The concentration of dieldrin ranged from 0.0786 to 0.122 ppm (0.039 ppm unrestricted). Groundwater: VOCs detected in groundwater include MTBE, benzene, and 1,1,1-trichloroethane (TCA). MTBE ranged from 11.3 to 17.5 ppb and was found in 2 out of 16 samples. Benzene ranged from 2.1 to 13.3 ppb and was found in 2 out of 16 samples. TCA was found in 1 sample at 9.1 ppb. Soil Vapor: VOCs detected in soil vapor samples include TCA, tetrachloroethylene (PCE), trichloroethylene (TCE) and BTEX compounds. TCA was detected in one sample at a concentration of 5.1 ug/m3. PCE ranged from 3.1 to 52 ug/m3 in 2 samples. TCE was found in one sample at 1 ug/m3. Combined BTEX compounds ranged from 35.5 to 101.6 ug/ m3 in three samples. NYSDEC and NYSDOH determined this site does not pose a significant threat to the environment or public health.

Site Health Assessment
Since most of the site is fenced and covered by concrete or building foundations, people will not come into contact with site-related soil and groundwater contamination unless they disturb the few soil areas at the site or dig below the surface. Contaminated groundwater at the site is not used for drinking or other purposes and the sites is served by a public water supply that obtains water from a different source not affected by this contamination. Volatile organic compounds in groundwater may move into the soil vapor (air spaces within the soil), which in turn may move into overlying buildings and affect 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. Because the site is vacant, the inhalation of site-related contaminants due to soil vapor intrusion does not represent a current concern. Furthermore, environmental sampling indicates soil vapor intrusion is not a concern for off-site buildings as a result of site contamination.

Contaminants of Concern
Type of Waste Quantity of Waste
  1. DEC Environmental Site Remediation Database.  Site Name: "Courtlandt Crescent".




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