412 49th Ave & 2-01 50th Ave, Long Island City, NY 11101

Hunters Point

VOCs "vapor intrusion" brownfield SSDS

Site Description[1]
The Queens West- Parcel 11 Site is located in the County of Queens, New York and is identified as Block 17 and Lots 21 and 28 on the Borough of Queens Tax Map. Parcel 11 is an approximately 0.45-acre area, which is part of the larger Queens West Development - Stage I Site. Parcel 11 is bounded by 49th Avenue to the north, 50th Avenue to the south, residential/commercial properties to the east, and Center Boulevard to the west. Surrounding land use consists of a high-rise residential building and public elementary school to the north, the Queens West waterfront park and East River to the west, a tennis club to the southwest, and the former Schwartz Chemical building site (currently being redeveloped with condominiums) to the southeast. The buildings immediately east of the Site are not part of the Queens West Development and are occupied by a mix of light industrial, commercial, and residential uses. The East River is located roughly 400 feet west of the Site. Historically, the Site was occupied by freight yards for the Long Island Railroad, a Hardwood Sawdust Supply Company, and later a variety of warehouse and light industrial uses, including a building equipment manufacturer. Historic uses of surrounding properties include: a varnish manufacturing facility (Keystone Varnish Company) and a vegetable oil refinery (Crown Oil Products Company) to the east; a coal-fired power generating facility and later Schwartz Chemical company (manufacturer of pigments and dyes) to the southeast; railroad tracks and freight yard facilities to the north (Parcel 10), west (Waterfront park area) and southwest, and a variety of manufacturing facilities further to the north (Parcels 8 and 9), including the Warren Chemical Company (manufacturer of roofing materials, tar paper and asphalt) and the Blau Gas Company (manufactured gas from petroleum products). Remedial investigations indicated elevated levels of polycyclic aromatic hydrocarbons (PAHs) and some metals (arsenic, copper, mercury, zinc). The main area of concern was hot spots near the water table (approximately 6 to 9 feet below grade). Remediation consisted of demolition of on-site structures, disposal of material in accordance with all applicable regulations, and disposal of soil beneath paved areas or buildings. A composite cover system to prevent exposure to residual contaminated soils was installed, which is comprised of concrete covered sidewalks, concrete building slabs, and two feet of clean top soil cover in landscaped areas (planters). Development on Parcel 11 includes a high-rise residential building with ground level retail on the southern portion of the Site (remedial work and building slab completed May 2003), and a second residential building, containing federally-subsidized housing for the elderly, on the northern portion of the Site. The residential buildings were constructed on-grade with no basements or other subsurface spaces, other than utility connections, elevator pits, and transformer vaults. Development of the Site is complete. The Final Engineering Report and Site Management Plan were approved in March 2008 for Track 4- restricted residential use. Nofurther Action letter and Libility release letters were issued in March 2008.

Site Environmental Assessment
Remedial investigations indicated that the shallow fill material, which was encountered from the ground surface to approximately 14 feet below grade, is the primary area of concern at the Site. This material was found to contain elevated levels of PAHs (exceeding TAGM RSCOs) and total arsenic, copper, mercury, and/or zinc (exceeding United States Eastern background levels). A secondary area of concern consists of portions of the fill material near the water table (approximately 6 to 9 feet below grade) exhibiting higher levels of PAHs and/or other evidence of petroleum-related contamination (e.g., odors), including an isolated area near the center of the Site (sample MW36), which contained elevated levels of VOCs and phenolic compounds associated with tar-like material. Results indicated that the VOC and SVOC contamination identified in MW36 is isolated in nature and is not migrating off-Site at significant concentrations that would result in adverse exposure to human health or the environment. The following media are contaminated: Soil - Elevated concentrations of PAHs and metals were detected in all samples collected from the fill material during the previous investigations of the Site and adjacent roadways. Metals concentrations were generally less than 10 times the United States Eastern Background ranges listed in TAGM 4046. With the exception of the grab sample collected at 6 feet below grade in B/MW36, the detected concentrations of individual PAHs ranged from 0.19 ppm to 24.3 ppm, and the total SVOC concentrations ranged from 8.62 ppm to 203 ppm. These concentrations are generally attributable to coal, ash, wood, and asphalt observed in the fill material and/or residual contamination from historic surface spills. The grab sample from B/MW-36 contained individual PAH concentrations ranging from 35.5 ppm to 1,100 ppm, and a total SVOC concentration of 7,960 ppm. This sample also contained elevated concentrations of phenolic compounds (phenol, 2,4-dimethylphenol, 2-methylphenol, and 3&4 methylphenol) ranging from 30.1 ppm to 68.6 ppm. Trace concentrations of VOCs were detected in 13 of the 17 soil samples analyzed; however, only four samples (from borings B/MW36, B39, B8A, and B14A) contained VOC concentrations exceeding TAGM RSCOs. Of these, only two samples (from borings B/MW36 and B14A) contained non-laboratory contaminants exceeding the RSCOs. These compounds included benzene (0.47 ppm) and total xylenes (3.6 ppm) in the sample from 6 to 10 feet below grade in B/MW36, and total xylenes (1.4 ppm) in the sample from 10 to 12 feet below grade in B14A. The elevated VOC concentrations detected in the B/MW36 sample are likely associated with the black tar-like material that was observed in this boring located in the central portion of the Site. The elevated total xylene concentration detected in B14A (located in the Center Boulevard roadway) only slightly exceeded the TAGM RSCO of 1.2 ppm. PCBs were detected in the sample from 0 to 2 feet below grade in boring B39 at a concentration of 4.2 ppm, which exceeds the TAGM RSCO for surface soil (1 ppm), but is less than the RSCO for subsurface soil (10 ppm). All other detected PCB concentrations were below TAGM RSCOs. Groundwater - During the 1989 sampling event, elevated VOC and SVOC concentrations were detected in groundwater samples from MW36, located in the central portion of Parcel 11, and MW38, located across Center Boulevard from the northwestern corner of the Site. Benzene, toluene, and PAHs were detected at elevated levels in both wells, with xylenes, trichloroethene, and phenolic compounds also detected in MW36. The groundwater contamination identified at MW-36 can be attributed to tar like material that was observed during installation of this well; whereas, the contamination in MW-38 may be associated with upgradient releases at Parcels 8 and 9. During the 1985 sampling event, total phenols were detected by Method 420.1 in monitoring wells MW8 and MW9, located in the roadways southwest and south of the Site, respectively; however, individual phenolic compounds were not detected by Method 625 analysis. Subsequent sampling of MW9 in 1989 did not detect elevated levels of VOCs or SVOCs in this well. MW8 had been destroyed prior to 1989, and could not be sampled at that time; however, during the 1994 sampling program, no elevated VOC or SVOC concentrations were detected in MW-13A, located approximately 50 feet northwest of MW8. These results indicated that the VOC and SVOC contamination identified in MW36 was not migrating off-Site. Elevated concentrations of several metals were detected in unfiltered samples from both on-Site and off-Site monitoring wells. These elevated concentrations can be attributed to silt contained in the unfiltered samples and do not represent actual groundwater conditions. Filtered samples from MW-36, MW-38, MW-9, and MW-13A, contained elevated concentrations of iron, lead, magnesium, manganese, sodium, and thallium. These dissolved metals can be attributed naturally occurring metals in the bedrock, potential tidal influence from the East River, and/or leaching of contaminants from fill material both on-Site and off-Site. Remediation for this Site is complete and consisted of a composite cover system, comprised of concrete covered sidewalks, concrete building slabs, and two feet of clean top soil cover in landscaped areas (planters). Long-term management of these EC/ICs and residual contamination will be performed under the approved Site Management Plan (SMP).

Site Health Assessment
Public water is provided to the area, thereby preventing exposures to groundwater. Most contaminated soil has been removed from the site. Cover material or site buildings will prevent direct contact with any residual contamination. The on-site building will include a sub-slab depressurization system to prevent vapor intrusion into the building.

Contaminants of Concern

Type of Waste Quantity
Chrysene UNKNOWN
indeno(1,2,3-cd)pyrene UNKNOWN




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