MOSTOLLER LANDFILL
SOMERSET COUNTY, PENNSYLVANIA
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Mostoller Landfill is a 278 acre municipal waste landfill located in Somerset County, Pennsylvania.  This site is owned and operated by Interstate Waste Services, Inc. and currently operates under the solid waste regulations imposed by the Pennsylvania Department of Environmental Protection (PA DEP).  It is made up of a series of adjacent disposal pads which are fully contained with a double High Density Polyethylene (HDPE) geomembrane liner system.  A continuous leachate collection piping system has been included into the design of the disposal pads to allow leachate generated within the waste to be transported to leachate holding tanks on the northwest portion of the site, where it will ultimately be transported via tanker trucks to waste water treatment facilities to be properly treated for contaminants.

Portions of the active disposal pads have reached the PA DEP permitted capacity. As a result, these areas have been permanently closed with the installation of an active landfill gas extraction system and a Low Linear Density Polyethylene (LLDPE) cap liner system. 

Duffield Associates has been on hand to provide their services for six (6) of the eight (8) active disposal areas and all closure cap phases 1 through 4 as the site construction engineering firm, construction manager, Construction Quality Assurance (CQA) inspection firm, and the soils/geosynthetics quality assurance conformance testing laboratory.  CGC has worked closely with PA DEP and township authorities to develop and maintain future expansion permitting, wetland mitigation, and on site coal strip mine reclamation which included the use of Duffield Associates’ in-house investigative subsurface core drilling capabilities on the site’s virgin soils.  Duffield Associates has also been engaged to design and complete various minor permit modifications for this facility including leachate sumps, leachate pump stations, active gas extraction systems, site CQA plan, E&S details, stormwater management designs and various construction details.