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Site Characterization & Soil Remediation Cost Reduction,
Proposed Police Station, Plainville, CT
HRP Associates, Inc. conducted Phase I, Phase II, and Phase III
site investigations for the Town of Plainville on a two-acre lot
which had historically been filled with contaminated soils. Site
investigations defined substantial portions of the site
exceeding DEP numeric soil remediation criteria applicable to GA
groundwater classification areas. However, no impact to
groundwater was demonstrated, and an area receptor survey
documented no water supply wells at risk.
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HRP
prepared a remedial cost estimate for the site and these
figures were integrated into a site development plan
which featured the construction of a new Plainville
police facility. In November 2000, the Town of
Plainville voted to allocate the necessary funding for
this project. An HRP Licensed Environmental Professional
(LEP) was retained by the Town of Plainville to prepare
a remedial action plan (RAP) and remediation contractor
bid document, to assist with contractor selection, and
to supervise the implementation of the RAP. |
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Throughout the project, HRP worked closely with the Police
Station Siting Committee and the architectural firm to
cost-effectively coordinate the remediation approach with the
redevelopment plans. In addition to meetings with the Town
Council and testimony at public hearings, HRP also coordinated
the remedial planning with the CT DEP. HRP obtained approval for
a remedial approach which was protective of human health and the
environment, but at the same time reduced the requirements and
associated costs for soil remediation by 20%. This cost
reduction was achieved by the creation of a perimeter “buffer
zone” of clean material.
Cost reductions were achieved through relocation of contaminated
soils removed from the buffer zone to locations within interior
portions of the site, and excavation of clean soil from the
proposed facility basement for placement as buffer zone backfill
(to eliminate the need for imported fill). The remedial plan was
implemented on an expedited schedule to facilitate the impending
construction start-up.
Brownfields Redevelopment Project, Former Gasoline Station,
Glens Falls, NY
Due to limited parking, the city of Glens Falls, New York was
interested in purchasing a vacant parcel that abutted City Hall.
However, a historical review of the vacant parcel determined
that the parcel was occupied by a gasoline filling station from
the 1940’s to the 1970’s. In addition, limited information was
available regarding the status of potential on-site underground
tanks and the condition of the site’s soils and groundwater.
Due to the unknown environmental condition of the site, a site
investigation was necessary determine if contamination was
present on-site, which the city, rightfully, did not want to
take responsibility. Therefore, to fund the investigation, HRP
assisted Avalon Associates, Inc. in preparing an Environmental
Restoration Project Application under the Clean Water/Clean Air
Bond Act to obtain a grant to fund up to 75% of the
investigation costs of the site investigation.
The city’s application was approved in 1999, and the site
investigation began in the winter of 2000 once the NYSDEC
approved the site’s Work Plan.
Brownfields Redevelopment Project, Former Steel Foundry,
Easton, PA
HRP Associates, Inc. is conducting a remedial investigation at a
former 100-year old steel foundry slated for demolition and
commercial development. The work is being conducted pursuant to
Pennsylvania’s Land recycling Program (Act2). The 34-acre site
consists of the 29-acre foundry and an adjacent five-acre
automobile dealership.
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A Phase II
ESA identified 19 potential areas of concern including
overall site-wide groundwater. The investigation was
conducted in a phased manner with each phase of work
building upon prior results. A total of 25 bedrock wells
and over 200 Geoprobe® soil sampling locations were
installed. Additional investigation techniques included
the use of hollow stem augers drilling, back hoe test
pits, and storm water system dye testing. |
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Air rotary drilling methods were used to install monitoring
wells in the limestone bedrock to a depth of up to 200 feet. In
some locations, telescoping casing was used to case-off
mud-filled voids. In one location No.2 fuel oil free product was
found on the water table surface at a depth of 110 feet. A free
product skimming system was designed by HRP to remove the
product to the extent practical. Geoprobe® technology was used
to quickly assess soil quality beneath the foundry building
floors as well as to determine the lateral and vertical extant
of foundry sand disposed of on site. An asbestos building
material survey was also conducted.
The results of the investigation were used to develop a site
conceptual models that depict source areas, migration pathways,
exposure points, and potential receptors. The models well be
used to support the selection of appropriate clean up standards
for soil and groundwater. The data has also be used to develop
five DEP remedial work plans designed cleanup identified areas
of contamination including the free product, asbestos removal,
drum area cleanup, PCB oil removal and foundry sand capping.
Brownfields Redevelopment Project, Waterfront Park, New
London, CT
Connecticut Real Estate Exchange
Blue Ribbon Award Recipient 2002
The city of New London is currently constructing a waterfront
park on the Thames River immediately south of the local railroad
station. The property was a former railroad maintenance yard,
dating back to the late 1800s. Several environmental
investigation reports were completed for the city in the 1980s
and 1990s which identified significant petroleum contamination
on the ground surfaces, extending down into the shallow water
table and eastward along the shoreline.
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During
construction of the piers for the elevated walkway in
Winter 2000, petroleum-contaminated soils were
encountered at the river’s edge, resulting in petroleum
releases to the river. HRP worked closely with U.S.
Coast Guard, Connecticut Department of Environmental
Protection (DEP) Office of Long Island Sound Program and
Urban Sites Remediation Program, and the City of New
London and its contractors to implement a mitigation
plan for preventing further releases into the surface
waters. |
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HRP researched and recommended the installation of a specialized
filter fabric which is designed to prevent oil migration but
allows water flow. The contaminated soils, rocks, and timbers
associated with the railroad yard along the shoreline were
excavated and disposed off-site. The filter fabric was placed so
that it would be covered by the stone revetment (rip rap) which
is adjacent to and below the elevated walkway.
All work was completed on an accelerated basis to accommodate
the use of the park for OpSail 2000 in early July. A temporary
stone dust layer cap was placed over the unexcavated areas west
to the railroad tracks so the site could be utilized for the
OpSail events. Additional soils have been excavated and a ground
water monitoring system has been installed. The investigations,
remediation, and proposed additional work has been approved by
DEP. The park is fully operational for public use.
Brownfields/Urban Redevelopment Project, Various Sites,
Waterbury, CT
HRP Associates, Inc. was retained by the Naugatuck Valley
Development Corporation (NVDC) to provide a full range of
environmental services to assist in an urban redevelopment
project involving a proposed Arts Magnet School, and an adjacent
regional branch campus for UCONN. Funding for the projects was
through the Connecticut Department of Economic and Community
Development (DECD). The proposed Arts Magnet School will also
include the renovation of a large theater building (the
“Palace”), which has been vacant for over 10 years. HRP began
the project with the completion of Phase I reports covering all
of the parcels involved with the project. Phase II/III
subsurface investigations were subsequently conducted.
Remediation of approximately 75,000 tons of petroleum and metals
contaminated soil was completed, via appropriate off-site
disposal. Also, numerous underground storage tanks were
remediated (removed) from the sites. The goal of the projects
was to attain Connecticut Remediation Standard Regulations (RSR)
compliance, which has largely been completed except for
post-remediation ground water monitoring. Construction is well
underway on both the Arts Magnet School and the UCONN Branch
Campus.
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In
addition, lead paint, asbestos, and microbial
contamination surveys were completed for the vacant
Palace Theater with the finding that abatement was
necessary for all three of these building related
contaminants. In order to make the building safe for
entrance by untrained personnel, an initial cleanup
involving lead paint, asbestos, and microbial
contamination was put out to bid, overseen, and
confirmed as completed through clearance testing.
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Once plans were completed for the structural changes to the
theater, an abatement plan was prepared and implemented for most
of the remaining asbestos. Due to the historic nature of the
theater, some lead paint and asbestos containing materials will
be managed in place. Asbestos and lead paint surveys were
conducted for eight other buildings within the project
boundaries prior to their demolition.
For More
Information
To hear more about how HRP can provide assistance with
Brownfields redevelopment, please contact the HRP office near
you:
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