51st - 53rd St. & 10th Ave., Manhattan, NY 10109

Clinton

Brownfield VOCs "Vapor Intrusion"

Site Description[1]
The site consists of several parcels located on West 53rd Street between 10th Avenue and the Amtrak easement, on West 52nd Street adjacent to the east side of the Amtrak easement, and along the Amtrak easement between West 51st and 53rd Streets in the City of New York, Borough of Manhattan. Railroad tracks pass through the site. A former ExxonMobil gas station was present on this portion of the Site from approximately 1950 - 1992. By February 2006, all original buildings on-site were torn down and all on-site contaminated soil was excavated and removed off-site. The property is currently owned by Dermot Clinton Green LLC. The Site now consists of two residential towers, a mixed-use low-rise building, public park, and subsurface parking garage (all currently under construction). A Certificate of Completion was issued on October 20, 2006.

Site Environmental Assessment
Past environmental investigations revealed that this BCP site had on-site and off-site petroleum impacted soil and groundwater as a result of petroleum spills from the former Exxon/Mobil Service Station at the corner of 53rd Street and 10th Avenue. Dissolved phase groundwater contamination (BTEX, lead and MTBE) has impacted the shallow groundwater table exceeding standards. An adjacent off-site building has experienced liquid petroleum in the basement. On-site and off-site remedial work occurred in early 2000. Although all on-site contamination has been removed through the BCP program in 2006, an off-site groundwater plume still exists and additional cleanup work is required to remediate the off-site contamination. The City of New York has accepted the responsibility for the off-site contamination and a final Site Investigation Work Plan has been submitted to NYSDEC. Field work will begin in the spring of 2009.

Site Health Assessment
All on-site contamination has been remediated through remedial actions completed in 2005-2006. Remedial actions included demolition of all site buildings, removal of all soil to the top of bedrock, and associated dewatering of the site. No contamination is known to exist beneath the top of bedrock. Therefore, all on-site exposures have been mitigated. A shallow off-site petroleum-contaminated groundwater plume was documented in 1993 (NYSDEC Spill No. 93-08101). Migration of the plume has been limited due to the geology of the area. NYSDEC is currently pursuing the responsible party (Clinton Green OU#2) to investigate and remediate any off-site contamination.

admin, Debra Hall

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