Planned soil excavations in both Area I (the former Gasoline
Underground Storage Tank Area) and Area II (the former Fuel Oil
Underground Storage Tank Area) took place the week of July 22
through 26. (see Community Update #1, December 2001 for details on the
Corrective Action Plan and a site plan).
French drain in Area I, which was serving as a conduit for contaminated
groundwater, was successfully removed, as was the passive treatment
system that was located near the Route 4 entrance to the site.
Excavation in Area II to remove soils that were presumed to be
the source of groundwater contamination in this area revealed
the presence of a previously unknown drywell. This drywell appears to have received
wastewater from both the former showroom area and the stone house.
The soils in and around the drywell were heavily
stained and field screening methods showed the presence of volatile
organic compounds in these soils. Discovery of this drywell explains
the presence of groundwater contamination in this area of the
The drywell and surrounding soils
were completely excavated and contained at the site. Samples
are currently being analyzed at a laboratory to characterize the
contamination prior to disposal.
The Air Sparging/Soil Vapor Extraction System (AS/SVES) in Area
I was activated on July 29, and startup monitoring shows that
it is effectively removing contaminants from the subsurface.
Decommissioning of the on-site supply well has been rescheduled
to the week of August 19, pending VTDEC review of the video survey
of this well. Marin Environmental, the contractor
for the site, has reported to VTDEC that the well appears to be
slowly filling itself in.VTDEC regulations require that abandoned
water supply wells be filled with a cement grout from the bottom
to the top.
Marin personnel will be visiting the site regularly over the
months to perform maintenance
activities and to collect data and samples in Area I that will
allow the effectiveness of the AS/SVE system to be evaluated.
The parties are continuing discussions regarding the institutional
controls and financial assurance issues. The 1999 Settlement
Agreement that provided the funds for the current cleanup activities
also provided the state a lien on the property to secure cleanup
costs in excess of the settlement fund amount. Liens on
the property also secure the tax liability to the Town of Woodstock
and other commercial debt of Gerrish Corporation. The parties
hope to renegotiate the 1999 Settlement agreement to simplify
the security arrangements for all parties, and to provide a more
robust form of financial assurance against the possibility of
the cleanup costs exceeding the funds available. Insurance,
bonding, maintenance of a balance in the settlement fund or a
combination of these may be used as the financial assurance mechanism.
Questions about the Gerrish Motors / Woodstock
East cleanup? Contact the VTDEC Project Manager