450 West 17th St, NY, NY 10011

Chelsea

Brownfield "Vapor Intrusion" SSDS VOCs CVOCs

17th and 10th Associates, LLC.  The Caledonia.
Site Description[1]
The Site is located in an urban area of New York County (Manhattan) located on the east side of 10th Avenue between W. 16th and W. 17th Streets (not including the building on the southeast corner of 10th Ave. and W. 17th St.) The former site features include several buildings and a paved parking lot. The site buildings were unused and were demolished. The most recent uses of the site include a warehouse for electrical construction equipment; an electrical contractor area; a vehicle garage and outdoor parking area; an outdoor garden supplies store; a restaurant; auto body shop; and classroom space for a theater company. Surrounding uses include multi-story residential buildings with and without lower-level commercial uses, parking, and playgrounds. The "High Line", an elevated rail line which was used in the past for freight and is now unused, is to the west of and partially over the western end of the site (with aerial easement). Prior uses include various freight and automobile uses, with underground fuel storage tanks, and unspecified manufacturing. An investigation pertaining to the removal of underground storage tanks occurred in the early 1990's. A Phase I and limited Phase II Environmental Site Assessment was performed in 2004. A Remedial Investigation was conducted under the BCP in 2005. The RI Report was approved in March 2006. The Remedial Action Work Plan with Stipulations was approved by the Department on April 26, 2006. A track 4 cleanup was achieved for the site. Engineering and Institutional Controls have been instituted to manage the residual contamination. These controls have been memorialized in the Environmental Easement that has been recorded in the new York County Clerk's office. The Final Engineering Report and Site Management Plan were submitted in November 2007, and a Certificate of Completion was issued on October 6, 2008.

Site Environmental Assessment

Based on the investigations conducted at the site, the primary contaminants of concern were related to the past uses of petroleum and historic fill which was present across the entire site. The site soils were contaminated with volatile organic compounds (VOCs - e.g. benzene, toluene, ethylbenzene, xylene, naphthalene) and semi-volatile organic compounds of petroleum origin and, to a much lesser degree with chlorinated solvents (e.g. tetrachloroethene). Exceedances of SCGs for both soil and groundwater had been identified. As part of the remediation, the petroleum contaminated soil was removed from the site as designated under OU-1 of the RAWP and the historic fill was excavated and disposed of at regulated facilities. Some clean native soil was also removed from below the contaminated zone. Groundwater was treated in situ and the clean effluent was discharged to the nearby City combined sewer. The contaminated soil and groundwater in OU-2 were remediated through injection of ORC (Oxygen Release Compound) into the underlying groundwater and subsoil. The top one foot of soil was removed through excavation. A Part 375 track 4 cleanup was attained for the site. Engineering controls in the form of the composite cover which consists of a vapor-barrier membrane and the concrete foundation of the redevelopment and in addition a sub-slab depressurization system in the OU-2 redevelopment were installed to manage the residual contamination. Institutional controls which include use restictions and prohibitions have also been memorialized in an Environmental Easement that has been recorded in the New York County Clerk's Office. A Site Management Plan and Final Engineering Report have been submitted and approved. The Certificate of Completion was issued on October 6, 2008. The first periodic review report is due for submittal on August 3, 2009.

Site Health Assessment
Public water is provided to the area, thereby preventing exposures to groundwater. The remedial action work plan for the site calls for the removal of contaminated soil from the site prior to construction of a residential building on-site. Soil gas is contaminated by chlorinated solvents that are likely due to an off-site source. The site owner will include measures in the building construction to prevent soil vapor migration into the building.

Contaminants of Concern
Type of Waste Quantity
ETHYLBENZENE UNKNOWN
NAPHTHALENE UNKNOWN
TOLUENE UNKNOWN
XYLENE (MIXED) UNKNOWN

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