The
City of Campbellsville wanted to expand their existing municipal landfill
and update their closure plan to meet new Subtitle D landfill standards. The existing landfill was 93.5 acres and accepted 50 tons of waste
per day. The fill area consisted of approximately 40 acres of subgrade waste
cells. The landfill was modified to
incorporate an area fill above the waste cells to keep from expanding the
waste area horizontally. The vertical
expansion of the landfill almost doubled the available volume on-site. To complete the design, a geotechnical study
was required to expand the borrow area to compensate for the additional cover
material that would be required.
Prior to redesign of the waste areas, several issues
with leachate and surface drainage needed to be resolved from the existing
landfill. Leachate outbreaks, primarily
due to poor surface drainage, were common below the waste areas and in a nearby
spring. Therefore, approximately 3,000
feet of leachate collection pipe was designed along with a duplex pump station
and 13,000 feet of force main to connect to the existing Campbellsville sanitary
sewer system. Additionally, diversion
ditches, drainage berms, and a sediment pond were designed to promote positive
drainage.
To
better evaluate the long-term effect of the landfill on the surrounding area,
a comprehensive groundwater study was completed.
A complicating factor in this study was the mature karst geology underlying
the site. Three distinct water bearing
zones were identified that had the potential for direct impact from the waste.
The unpredictable nature of water flow through karst rock formations
as well as the multiple water bearing zones to be monitored, required creativity
in the development of the groundwater monitoring plan for the site.
Our
staff also enhanced the operations at the site by preparing a surface water
monitoring plan, revegetation plan, methane control plan, long-term post closure
care plan, and revised the record keeping system.
To meet the solid waste needs of the City well into the future, we
also assisted in site selection for a new facility and prepared preliminary
design documents for a 60 cell fill area with a closed loop leachate irrigation
system.
Expansion & Closure
Campbellsville, Kentucky
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