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LANDFILL
PROJECT PROFILES:
Maryland Landfill Project
For a Maryland regional landfill owned and operated by one of the nation's
top waste management
companies, RT completed the design of a leachate collection and pretreatment
system. The regional
landfill and leachate management system was designed to serve a county-wide
area in western Maryland.
RT's work included the comprehensive design of a leachate conveyance and
pretreatment system
including details associated with pumping from landfill cells, a gravity
system to convey leachate from
the cells to the treatment plant, as well as the pretreatment plant itself.
Facilities at the plant included
flow equalization tanks, metals treatment, biological treatment, and sand
filtration. Work also included
design of a pretreated effluent pipeline which tied into the regional
sanitary sewer system.
The entire leachate management system is designed for flexibility so that it
can be extended as new cells
in the landfill come on line. The treatment system is similarly designed, and
the plant is outfitted with an
emergency generator to make sure that the biological treatment system will
not be lost during an
extended power outage. A comprehensive alarm and instrumentation system
oversees and monitors key
plant and collection system functions. The state-of-the-art, double-lined
landfill began to receive waste in
early 1993.
School Site Landfill
RT Environmental Services developed a
comprehensive Closure Plan for the School Site Landfill in King of Prussia,
Pennsylvania. Closed under Pennsylvania Municipal Waste Management Regulations,
the landfill consisted of an approximate 5 acre area, with steep slopes and an
essentially flat top which made cap design difficult. Additional challenges on
the project included difficult stormwater conveyance conditions, and little
perimeter area available for conventional erosion and sedimentation control
systems.
The closure design for the facility included
installation of a synthetic liner, overlain by a drainage net and geotextile.
Above these layers was common fill, and then a topsoil layer. A lined stormwater
pond was designed to sit atop one corner of the landfill to control peak
stormwater flows, working with a second basin installed in a small section near
the entrance road.
RT also provided quality assurance/quality
control services during construction of the cap. The plan included groundwater
monitoring wells, a passive landfill gas venting system, and specialized
techniques for stabilizing the steep slopes. During the post closure care
period, as the landfill drains down now that a cap has been installed, RT
continues to serve its client by providing review and comment on groundwater
quality issues.
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