6469 Broadway, Bronx, NY

North Riverdale

brownfield, VOCs, "Vapor Intrusion"

6469 Broadway LLC, Palisades Ventures LLC/One Stop West Auto Repair
Site Description[1] 
Location: This site is located in an urban area at 6469 Broadway, Bronx, NY. The site is approximately 0.40 acres in area. Site Features: The site is bordered by a multi-family residential structure to the north (Riverdale Housing for the Elderly), a parking structure to the south, single-family residential structures to the west (separated by a rock outcropping), and Van Cortland Park to the east (across Broadway). Current Zoning/Use: The property is currently operated as a filling/automotive service station and carwash. The Site is partially located in a commercial overlay zone (C2-2) located within a predominantly residential area (R6). The surrounding parcels of property are being used for both residential and commercial purposes. Historical Use: Based on information obtained from the review of historic Sanborn Fire Insurance Company Maps the site has been used as a filling station and/or automobile repair facility since sometime between 1914 and 1929. NYSDEC spill number 0108922 was assigned to 6469 Broadway in December 2001 after the discovery of petroleum-contaminated soil during an upgrade of the underground storage tanks (USTs). Subsequent to the spill report, several phases of investigation were performed between December 2001 and September 2009. Site Geology and Hydrogeology: The site is underlain by coarse, black, brown, and gray, sand with gravels and traces of bricks (fill), clay, and silt. Shallow bedrock was encountered in the southeastern portion of the site at 1.5 to 4.5 feet below surface grade (bsg) and in the southwestern portion at 6 inches to 1 feet bsg, with deeper soils encountered to the north (6 to 8 feet bsg). Depth to groundwater ranges from five to eight feet bsg throughout the property. Groundwater is documented to be flowing in an overall easterly direction, towards Van Cortlandt Park.

Site Environmental Assessment
Nature and Extent of Contamination Based on investigations conducted to date, the primary contaminants of concern are xylenes and 1,2,4-trimethlybenzene. Both of these contaminants are found in the soil and groundwater. The concentration of xylenes in groundwater is up to 920 ppb (compared to groundwater standard of 5 ppb), and 1,2,4-trimethlybenzene has been detected at concentrations up to 700 ppb compared to groundwater standard of 5 ppb. In soils, 1,2,4-trimethlybenzene has been detected at concentrations up to 170 ppm (Unrestricted use Soil Cleanup Objective is 3.6 ppm), and xylenes have been detected at concentrations up to 440 ppm compared to the UUSCO of 0.26 ppm. Significant Threat: The site does not present a significant threat to public health or the environment.

Site Health Assessment
Direct contact with contaminants in the soil is unlikely because the site is covered with buildings and pavement. People are not drinking the contaminated groundwater because the area is served by a public supply that is 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 may 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. Based on the current use of the on-site building as an automotive garage, inhalation of site-related contaminants due to soil vapor intrusion is not a concern.

Contaminants of Concern
Type of Waste Quantity of Waste
1,2,4-TRIMETHYLBENZENE UNKNOWN
XYLENE (MIXED) UNKNOWN
  1. DEC Environmental Site Remediation Database.  Site Name: "6469 Broadway".

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