Groundwater Treatment
System Improvements/Groundwater Collection Trench Construction
Work Description
– General:
Chase Environmental Group
(Chase) was contracted to install pumps and provide system
improvements, including software upgrades to an existing
groundwater treatment system located at former lighting
manufacturing facility. Chase also installed a groundwater
collection trench measuring approximately 600 feet in length.
The system was designed to facilitate the extraction, treatment
and discharge of groundwater from on-site shallow wells.
The extracted groundwater is treated by a counter-current,
shallow tray, air-stripping unit. The groundwater is contaminated
with trichloroethene (TCE) and its degradation products.
Modification of the existing
system included connecting influent and effluent piping,
providing electrical power, and connecting sensor and control
wiring to the existing panel. The system is controlled by
ISACC (Intelligent System for Automatic Control and Communication).
Chase completed an upgrade to this system and installed
mechanical and digital flow meters to the influent lines
as well as a pressure regulator to control air pressure
to the wellhead.
Chase completed constructed of a 600-foot long groundwater
collection trench. The depth of this trench was between
twelve and fifteen feet deep and was excavated into bedrock.
The trench was lined with a 20-mil high density polyethylene
(HDPE) sheeting on the bottom and downgradient side of the
trench. After the lining was installed, drainage pipe, filter
fabric and pea gravel were installed to facilitate drainage
towards a sump. A 1,000 gallon HDPE tank was installed in
the sump area. A pneumatic twin diaphragm pump was installed
in the tank. A high level alarm was installed in the sump
and integrated into the ISAAC system which will notify the
system in the event of sump pump failure.
Approximately 600 tons of soil impacted by the contaminants
were disposed of as special waste as part of this project.
