The site is located on the west side of Fifth Avenue between 141st Street and 142nd Street in Manhattan. The entire site is occupied by a building comprised of three connected sections. The site is at an elevation of about 10 feet or less above mean sea level. Surrounding the Site are multi-story residential buildings on the west, south and southeast; the Harlem River Drive and the Harlem River on the east; and the 369th Regiment Armory to the north. From 1970 to 1994 the Site was occupied by an industrial laundry with a dry cleaning operation utilizing tetrachloroethylene (PCE) as a cleaning solvent. A portion of the building was renovated for use as a public school, but such use was discontinued. A Soil Vapor Extraction system (SVE) was installed as part of the Interim Remedial Measures (IRM) to remove PCE. The SVE has been operated continuously since 1997, and was renovated in 2002. April 2005, the SVE was shut off to evaluate the performance of the remedy. During one of the subsequent indoor air quality monitoring events TCE concentration were found to be above the DOH guidance value. The SVE system was re-activated on December 18, 2006. As of this update, the additional remedial investigation was completed during 2008, and NYSDOH required additional vapor intrustion investigation around the site perimeter. The additional vapor intrusion investigation is underway.
Site Environmental Assessment
From 1970 to 1994 the Site was occupied by an industrial laundry with a dry cleaning operation utilizing tetrachloroethylene (PCE) as a cleaning solvent. Soils beneath the site, and on-site and off-site groundwater are contaminated with PCE. Additional investigation is underway to fully delineate the contamination. There have been documented exceedances of the NYSDOH indoor air guidance values for TCE and PCE in the former basement boiler room (below Room 112).
Site Health Assessment
During renovations to the building in 1996-1997, several rounds of indoor air testing were conducted and on one occasion the data indicated the presence of tetrachloroethene (PCE) above the NYSDOH residential indoor air guideline of 15 parts per billion (ppb). Interim remedial measures initiated during 1997 to address the source of the contamination included the installation and operation of a shallow soil vapor extraction system. These measures have generally resulted in reducing the levels of tetrachloroethene in indoor air to levels below the15 ppb guideline. Indoor air sampling conducted in April 2002 only detected trace concentrations of PCE. Exposure to contaminated groundwater is unlikely as public drinking water is supplied to the entire community. Exposure to contaminated soils is unlikely as the affected areas are covered by buildings or pavement.
Contaminants of Concern
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