Site Assessments
&
Remediation Project Examples
PCB Remediation Project
New Haven, CT
Client: Gilbane
Building Co.
Description: Triton
was retained by Gilbane to provide soil
characterization, site monitoring, design and
remediation services during the construction of
a massive 6 million gallon underground storage
tank for combined sewage overflow (CSO).
Formerly, the site was occupied by a mixture of
industrial, commercial and residential
properties including a screw machine company, an
electric supply company, and an oil company (the
use of which included several reported
aboveground storage tanks).
Soils impacted with petroleum hydrocarbons and
polychlorinated biphenyls (PCBs) were identified
within the CSO tank construction zone. A
portion of these soils were remediated through
excavation prior to construction. The
construction of the CSO storage tank involved
the drilling of 306 individual boreholes to a
depth of approximately sixty-five feet below
grade around the tank perimeter. These
borings, called secant piles, were subsequently
filled with concrete to form the walls of the
CSO tank. Once the walls were formed, the
interior of the tank was then dewatered and the
soils located within the tank interior were
excavated in a mass excavation project.
Role: Triton
managed the environmental cleanup, performed
confirmation soil testing, site monitoring, and
provided remediation design which was developed
in coordination with CTDEP and EPA.
Additionally, Triton assisted with the
monitoring and testing of dewatering wastewaters
generated during site excavation.
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