503-509 East 75th St.& 502-504 East 76th St., New York, NY, 10021

Upper East Side

VCP VOCs "Vapor Intrusion" "Vapor Barrier" "Groundwater Treatment System"

The Denihan Co. formerly BJ Denihan
Site Description[1] 
The site is located on the upper east side of Manhattan, between York Ave and the FDR Drive, in an urban area with mixed uses. Four vacant commercial buildings that existed on the site were demolished. Prior uses of the property were light industrial and commercial: an automobile repair shop, bakery, dry cleaner, and garage. Surrounding uses are residential, industrial, and commercial. The entire property, which covers 33,215 square feet, is now one building, a private school, the Lycee Francais. Construction of the school's basement required excavating 30 feet below grade and into bedrock. Groundwater seeping into the excavation was contaminated with tetrachloroethylene (PCE). The foundation of the school building is lined with a vapor barrier, and a groundwater collection system treats groundwater and discharges it to the City sanitary sewer. A site management plan requires periodic certification of the institutional and engineering controls, and a deed restriction will be placed on the property. The final engineering report and the site management plan were approved in March 2008.

Site Environmental Assessment
The groundwater at the site is contaminated with tetrachloroethylene. The groundwater is collected, treated, and discharged to the NYC sewer system. A discharge permit is issued by the NYCDEP. An off-site exposure assessment and investigation was conducted. Soil gas and groundwater samples were collected from the sidewalks around the site with one result on the south side of E 76 St on the nw corner of the school was of concern. NYSDOH requested that indoor air sampling and sub slab samples be collected in the adjacent properties. The investigation concluded in March 2008 and no vapor intrusion was detected.

Site Health Assessment
On-site groundwater is contaminated with tetrachloroethene. However, the area is served with public water; therefore, ingestion exposure is not expected. Currently, an activated carbon groundwater treatment system is in operation on-site. Contaminated soils have been removed and disposed of offsite. The site is covered by the onsite building and pavement. A vapor barrier was installed in the onsite building to minimize the potential for soil vapor intrusion. The evaluation of the potential for soil vapor intrusion into nearby off-site structures is complete.

Contaminants of Concern
Type of Waste Quantity
TETRACHLOROETHYLENE (PCE) UNKNOWN
TRICHLOROETHENE (TCE) UNKNOWN

admin, Debra Hall

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