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Former General Motors North Tarrytown Assembly Plant

Site No. C360070/C36070B

Action has been completed to address the contamination related to the Former General Motors North Tarrytown West Parcel site and the Former General Motors (GM) North Tarrytown East Parcel site located at 199 Beekman Avenue and 60 Continental Street, respectively, Sleepy Hollow, Westchester County under New York State's Brownfield Cleanup Program.


Historical Overview

The site is located along the eastern shore of the Hudson River, occupies approximately 96.5 acres (west parcel 66.67 acres and east parcel 28.29 acres) and is bisected by an active passenger and freight rail corridor. The site is the location of a former automobile assembly plant owned and operated by General Motors Corporation since 1914. At the time GM ceased assembly operations in July 1996, the main site features included two large manufacturing buildings. The assembly plant and support buildings were decommissioned and all structures have been demolished, except for two large floor slabs (covering much of the surface area on the west side of the railroad tracks) and a section of a pedestrian bridge over the rail lines.

The current proposal for the development of the West Parcel includes a mixed-use waterfront project with residential units, retail space, office space, an inn, the possibility for an on-site train station (subject to Metro-North approvals) and associated parking, with approximately 30 acres planned as publicly accessible open space.

The possible future uses of the East Parcel could include: the expansion of Devries Park; construction of a new Village Department of Public Works facility; and the expansion of adjacent Philipsburg Manor Restoration.

Project Activities

In November, 2002, GM and Roseland Property Company ("Roseland") entered into a Voluntary Cleanup Agreement ("VCA") with NYSDEC to investigate and remediate the site property for the purpose of post-remedial development for restricted residential and restricted commercial use ("Lighthouse Landing"). In March, 2005, GM/Roseland completed their transition to the Brownfield Cleanup Program ("BCP"). The Brownfield Cleanup Agreement was subsequently updated in 2010 to name GM LLC as a participant in the Brownfield Cleanup Program. A number of investigations/corrective measures have been performed by GM since 1996. Specifically, investigations identified subsurface soils and groundwater contaminated with lead, chromium, TCE and petroleum related constituents in four separate potential areas of concern (PAOC) at the site. The following remedial actions were taken in 2007 as part of Interim Remedial Measures (IRMs) to address these four areas of the site:

  1. PAOC-7: Excavation and off-site disposal of 3,700 yd3 of soil;
  2. PAOC-29: Excavation and off-site disposal of 1,100 yd3 of soil;
  3. PAOC-47: Excavation and off-site disposal of 3,700 yd3 of soil and injection of 40,500 gallons of an in-situ chemical oxidant; and
  4. Former Underground Storage Tank Area: Excavation and off-site disposal of 6,500 yd3 of soil along with the injection of an in-situ chemical oxidant.

Pre-excavation delineation sampling along with post-injection groundwater sampling data indicates that these IRMs have removed the contaminant source areas.

Remedial Investigation

Remedial Investigation activities were initiated at the site in the fall of 2003. Separate remedial investigations were completed for the on-site areas (West and East Parcels) and the off-site area (Hudson River). A draft Sediment Evaluation Report was submitted to the Department which presents off-site investigation information. Based on the findings of the previous sediment sampling program, it was determined that additional samples in the Hudson River needed to be collected. Work plans were developed (September 2006) with the additional sampling completed in October 2006. The results of the additional Hudson River sampling and analysis have been summarized in a Final Sediment Remedial Investigation Report (January 2012). The Department approved Sediment Remedial Investigation Report in January 2012.

The land-based Remedial Investigation Report was also finalized in January 2012 and placed in the document repositories. The Final Remedial Investigation Report presents findings for on-site investigations (East and West Parcels). As summarized in Remedial Activities to Date above, based on the results of the Remedial Investigation, IRMs were completed at the site in 2007 to address four areas of concern. The IRM activities are summarized in a Construction Completion Report dated September 2008.

Based on the remedial investigations (RI) along with interim remedial measures (IRMs) performed to date, the NYSDEC determined that the Former General Motors North Tarrytown Assembly Plant West Parcel site and the Former General Motors North Tarrytown East Parcel site do not present a significant threat to human health or the environment.

Remedy Selection

The Decision Document for the Former General Motors North Tarrytown Assembly Plant West Parcel site and the Former General Motors North Tarrytown East Parcel site was issued in June 2012. The selected remedy for the sites included:

  1. Dredging of Hudson River sediments at the mouth of a former industrial wastewater outfall.
  2. Restoration of the dredged area with NYSDEC-approved backfill.
  3. Removal of sediments from the West Parcel storm drains.
  4. Stabilization of the removed sediments with Portland cement and protection of the stabilized sediments on the West Parcel for use as fill beneath the final cover.
  5. Construction of a cover system. The existing building slabs and pavement at the sites form the cover system. A site cover will be maintained as a component of any future site development, which will consist either of structures such as building, pavement, and sidewalks or a minimum of two feet of soil over a demarcation layer.
  6. Placement of institutional controls in the form of an environmental easement on the properties that allow the use and development of the property for restricted-residential, commercial and industrial use.
  7. Development of a Site Management Plan that includes an Excavation Plan which details the management of future excavations in areas of remaining contamination; evaluation of the potential for soil vapor intrusion for any buildings developed on the site, including provision for implementing actions recommended to address exposures related to soil vapor intrusion; monitoring of groundwater on the West Parcel to assess the performance and effectiveness of the remedy; identification of any use restrictions on the site; and provisions for the continued proper operation and maintenance of the components of the remedy.
  8. Periodic certification by the property owner of the institutional and engineering controls, prepared and submitted by a professional engineer or such other expert acceptable to the Department, until the Department notifies the property owner in writing that this certification is no longer needed.

Remedial activities prior to redevelopment were completed at the sites in 2013. Separate site management plans were submitted for the west parcel site and the east parcel site and approved by the Department in December 2013. A final engineering report, which documented remedial activities completed at both the west parcel and east parcel sites, was prepared and approved in March 2014.

Certificate of completions (COCs) for the Former General Motors North Tarrytown Assembly Plant West Parcel site and the Former General Motors North Tarrytown East Parcel site were issued in March 2014

Project documents are available for review at the following repositories:

Warner Library
121 North Broadway
Tarrytown, NY 10591
Phone: (914) 631-7734
Hours: Monday and Thursday 1:00 p.m. - 9:00 p.m.
Tuesday and Wednesday 10:00 a.m. - 6:00 p.m.
Friday 9:00 a.m.- 5:00 p.m.
Saturday 10:00 a.m. - 5:00 p.m.
Sunday 1:00 p.m. - 5:00 p.m.

Sleepy Hollow Village Hall
28 Beekman Avenue
Sleepy Hollow, NY 10591
Phone: (914) 366-5106 (Village Clerk's Office)

Region 3 Office
21 South Putt Corners Road
New Paltz, NY 12561-1696
Attn: Sara Shepard
Phone: (845) 256-3018
Hours: Monday - Friday 8:30 a.m. - 4:45 p.m.

Central Office
625 Broadway, 11th Floor
Albany, NY 12233-7014
Attn: Jamie Verrigni
Phone: (518) 402-9662
Hours: Monday - Friday 7:30 a.m. - 4:00 p.m.

Additional Information

Should you have questions regarding the status of the BCP project, at this site, you may contact:

Jamie Verrigni
Project Manager
625 Broadway
Albany, New York 12233-7014
Phone: (518) 402-9662

For health related questions, you may contact:

Fay Navratil
NYS Department of Health
Empire State Plaza
Corning Tower, Room 1787
Albany, NY 12237
Phone: (800) 458-1158, Ext. 27880

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