837 64th Street & 829-884 65th Street, Brooklyn, NY 11220

Bay Ridge

superfund VOCs "vapor intrusion" MGP

National Grid
Site Description[1] 
Location: The site is located in an urban area at 837 64th Street (Station A), and 829-884 65th Street (Station B), in the Borough of Brooklyn, Kings County. Site Features: At Station A the parcel is entirely paved with no aboveground structures. At Station B, there is a National Grid Gate Station building and an associated parking lot in the eastern portion of the site; and two baseball fields with bleachers, dugouts, a concession building and storage shed in the western portion of the site. Current Zoning/Use(s): Both parcels are currently active and are zoned for commercial use. The surrounding parcels are currently used for a combination of commercial, light industrial and residential applications. The nearest residential area is approximately 75 feet northeast of Station A. Historical Use(s): At Holder Station A, the site was used for the storage of gas from approximately 1945 until 1960. The holder was dismantled in 1970, when it was converted to a parking lot for an automotive dealership. At Holder Station B, the site was used for the storage of gas from approximately 1900 to 1970. All of the gas holders and associated buildings had been removed and the gate station constructed by 1975. The large baseball diamond at the west end of the site was constructed around 1984. Operable Units: The site was divided into two operable units. An operable unit represents a portion of a remedial program for a site that for technical or administrative reasons can be addressed separately to investigate, eliminate or mitigate a release, threat of a release or exposure pathway resulting form site contamination. Operable Unit 1 (OU-1) is a 1.5 acre lot (Block 5735, Lot 17) and is the location of a former gas holder. Current land use is a parking lot. Operable Unit 2 (OU-2) is a 1.5 acre lot (Portion of Block 5749, Lot 15) and is the location of two former gas holders. Current land use is as an active gas regulating station. Site Geology and Hydrogeology: The geology at the site consist of five basic lithologies of native sediments as glacial ice-contact and outwash deposits. The dominant unit consisted of dense, red-brown, silty fine sand of low permeability (till). Overlying the native soil was fill of various types and thickness. The fill generally thinned moving from east to west across the site, and consisted primarily of sand with cobbles, coal, slag and cinders. The depth to groundwater ranges from 75-85 feet below ground surface, and generally flows to the west-southwest.

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
Prior to Remediation: An Environmental Site Assessment (ESA) was conducted at the Station B parcel in 2000. The ESA concluded that there were low levels of semi-volatile organic compounds (SVOCs), primarily polycyclic aromatic hydrocarbons (PAHs), in the surface soil, ranging from 22 ug/kg to 6,760 ug/kg. In subsurface soil, benzene, toluene, ethylbenzene, and xylene (BTEX) were detected from 1 ug/kg to 228,000 ug/kg. SVOCs (PAHs) were found to range from 15 ug/kg to approximately 181,000 ug/kg. Trace concentrations of (13.5 to 19.2 mg/kg) total cyanide were also found. No groundwater sampling was conducted. Approximately 15 cubic yards of soil containing these cyanide concentrations were removed in 2000. The site characterization began in September of 2010 and is currently underway.

Site Health Assessment
Since the site is fenced and covered by asphalt, concrete and soil, people will not come into contact with site-related soil contamination unless they dig at least two feet below the surface. People are not drinking the contaminated groundwater because the area is served by a public water 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. Currently there are no occupied buildings on the site. An evaluation of the potential for soil vapor intrusion to occur will be completed should the current use of the site change.

Contaminants of Concern
Type of Waste Quantity of Waste
COAL TAR UNKNOWN
  1. DEC Environmental Site Remediation Database.  Site Name: "K - Bay Ridge A Station".

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