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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