Capslan Ct between Cove & Riviera, Queens, NY 11356

College Point

superfund VOCs "vapor intrusion" CVOCs

NYC Department of Citywide Administrative Services (DCAS), Riverview Condominiums
Site Description[1] [2] 
Location: The site is located in an urban residential area of the College Point section of Queens adjacent to the East River. The site consists of a 0.24-acre grassy parcel of land within the Riverview Condominium complex between several condominiums. The site is bounded by Riviera Court to the north, Capstan Court to the east, Cove Court to the south, and the College Point Properties Voluntary Clean-up (VCP) site V00254 to the west. Site Features: The site is a grassy area between three condominiums and the property line to the west where a subsurface barrier wall was installed by the College Point Properties VCP site to prevent any migration of oil {Light Non-Aqueous Phase Liquid (LNAPL)} westward. Historic Uses: This area was reclaimed from the East River via unregulated landfilling prior to 1970. Sand, silt, and clay are mixed with varying amounts of construction and demolition debris as well as industrial waste. A State Superfund Site Characterization of the site in March 2007 identified Polychlorinated Biphenyls (PCB) contaminated LNAPL. An Interim Remedial Measure was initiated in October 2007 to remove the LNAPL (Absorbent socks are installed and replaced in some wells) until a remedy can be implemented. Site Geology: The site is overlain with urban fill. The fill thickness varies from approximately 25 feet to greater than 40 feet thick on this property, due in part, to the fact that the landfill material (fill) extends 10 ft or more into the water table. The fill consists of a heterogeneous mixture of sand, slit, clay and varying amounts of construction and demolition debris (i.e, bricks, wood, concrete, gravel, rubber, slag, metal,coal, asphalt, wire, foam, etc.) Industrial waste (e.g., plastic containers, melted plastic) was also found in test trenches during previous investigations. Native soils, consisting of stratified mixtures of sand, silt, and clay were encountered in some borings at depths ranging from 24-40 feet below ground surface. Groundwater is approximately 12fbg and flows from northeast across the site. Tidal influence appears to be negligible although a Tidal Influence Study will be included in Remdial Investigation/ Fesibility Study Report

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.<form> </form> Site Environmental Assessment
Nature and Extent of Contamination: 13 monitoring wells have been installed to date. 10 wells were previously installed during the Site Charactization. Several VOCs above groundwater standards, mostly related to petroleum, were found on site. For example, xylene at 400 ppb, benzene at 2,100 ppb, toluene at 420 ppb, ethylbenzene at 430 ppb. SVOCs (phenols and PAHs) were also found above standards. For example, naphthalene at 2000 ppb and phenol at 200 ppb. Metals (including arsenic at 63 ppb, cadmium at 6.9 ppb, and chromium at 65 ppb) were found above standards in the groundwater wells. LNAPL has been found in 10 monitoring wells on and around the site. All LNAPL samples are contaminated with PCBs, with levels as high as 490 ppm. The Phase 1 investigation indicated surface soils at the site have been impacted by SVOCs (mostly PAHs usually associated with urban fill) and PCBs at a maximum concentration of 10.0 ppm. The area of impacted surface soils is scattered with no discernable pattern. The Phase 1 remedial investigation found the subsurface soils at the site have been impacted by VOCs (a few samples had petroleum related compounds), SVOCs (PAHs usually found in urban fill), PCBs, (maximum concentration of 10 ppm) and metals (cadmium, lead, chromium, arsenic) slightly above standards. The the area of impacted subsurface soils is scattered with no discernable pattern. Surface water, seeps, and sediment samples were collected at the East River shoreline. Several metals were detected in the sediment samples collected at the shoreline at concentrations higher than sediment screening criteria (chromium, copper, lead, mercury, and zinc. Only copper and arsenic exceeded water quality standards in the surface water and seeps, respectively. During a previous investigation analysis of soil gas revealed low levels of petroleum compounds and chlorinated solvents which prompted a soil vapor intrusion study of the surrounding condominiums. Based on the results of subslab and indoor air samples, DOH determined that no further action was required with regard to soil vapor intrusion. This site presents a significant threat to the environment due to contaminated soils, groundwater, and LNAPL found on site. A Document Repository has been set up at the Queens Public Library, Poppenhusen Branch located at 12123 14th Ave. Flushing, NY 11356-1644

Site Health Assessment
Access to the site is unrestricted. However, contact with contaminated soil or groundwater is unlikely unless people dig below the ground 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. Sampling indicates soil vapor intrusion is not a concern for the on-site buildings.

Contaminants of Concern
Type of Waste Quantity of Waste
  1. DEC Environmental Site Remediation Database.  Site Name: "College Point 3".
  2. Queens Chronicle.  5/6/10.  "Riverview listed as a Superfund site".




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