1st Division Road Landfill, Fort Benning, GA
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J2 performed remedial design and construction to repair and
modify an existing landfill gas (LFG) extraction remediation system
at the 1st Division Road Landfill, Fort Benning, GA. Slumping of
the landfill cover had caused damage to the existing buried LFG
extraction system. J2 reinstalled the new LFG system using an
adjustable support design. Prior to installation, J2 performed
repairs to the landfill cap that included placement of 15,500 cy of
soil to restore the landfill cover back to its originally designed
grade; seeding with native grasses to reestablish a vegetative
cover to mitigate the erosion effects of wind and water; repair to
drainage features to ensure proper conveyance of surface run-off to
the settling pond; and installation of an additional toe-drain to
increase cap drainage capacity.
As part of the LFG system restart, J2 reinstated the telemetric
controls to be able to troubleshoot the system remotely and notify
local personnel if the system had shut down and needed to be
manually restarted.
Monthly LFG monitoring displayed a significant reduction in the
offsite migration of methane gas within a very short period of
time. Additionally, the balanced LFG extraction is allowing for
uniform settlement of the landfill. J2 has maintained the system
for the last 3 years.
Monthly O&M has been performed, including adjustments as
necessary to balance the flow and concentrations of landfill gases.
J2 designed and constructed a methane diversion trench located off
of the eastern side of the existing landfill to divert the methane
gas migrating through the soils from the landfill and vent the
methane to the atmosphere before the gas reaches the permitted
boundary of the landfill. The trench successfully kept methane gas
concentrations within the regulatory limit at this compliance
point.
J2 is currently working with Fort Benning to retrofit the LFG
extraction system to a turbine waste-to-energy system (Flex Energy)
to convert the methane gas extracted from the landfill into
renewable energy.
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