SITE INVESTIGATIONS
Our principal technical work activity over the past nine years has
been site investigations. The scope of over 600 site investigations conducted
by Tewhey Associates has ranged from Phase 1 and Phase 2 Site Assessments
for the purpose of property transfer to full RCRA Facilities Investigations
(RFIs) at large manufacturing sites. Exploration techniques have included
test pitting/trenching, conventional hollow-stem augers and cased borings,
Geoprobe borings, Hydropunch sampling, and field immunoassay testing.
Plastics Manufacturer, Maine.
Tewhey Associates conducted a RCRA Facilities Investigation (RFI) at
a plastics manufacturing plant in Maine. The work involved project planning,
interactions with the regulatory personnel from the Region I USEPA and
the Maine DEP, test pitting, Geoprobe explorations, conventional soil borings
and installation of monitoring wells, conventional and Hydropunch groundwater
sampling, field GC analysis of groundwater for VOCs, field immunoassay
testing of soils for PAHs, data interpretation, and reporting. As a result
of findings of the RFI, Tewhey Associates planned and implemented an interim
remedial measure (IRM) consisting of soil removal at a former fire training
facility on the site. At the outset, Tewhey Associates competed for the
project with a large, national environmental consulting company. Tewhey
Associates proposed a project cost that was 35% of the proposed costs of
the large company. The work was completed on time and 20% under budget.
Industrial Site, Portland, Maine.
Tewhey Associates was retained by the owner of a regional trucking
facility to review and assess environmental conditions and conduct a peer
review of proposed remedial plans at the property. Former site practices
included use of a disposal pit for tanker cleaning and truck washing. The
peer review suggested contaminated groundwater was currently being collected
by the municipal storm water system that crossed the site and that levels
of VOCs in groundwater were acceptable at the POTW. The insitu groundwater
remediation scheme was coupled with excavation and landfarming of the most
highly contaminated soils. After extensive interaction with the MDEP, the
client received approval to undertake the multi-media, multi-phase, but
cost-effective remedial program. The remedial action was completed in early
1993 and limited groundwater and sewer monitoring is ongoing at the present
time. The elimination of the proposed groundwater collection/treatment
system saved the client approximately $250,000.
Tewhey Associates
P.O. Box 238
Gorham, ME 04038-0238
(207) 839-4261 - Voice
(207) 839-3834 - Fax
