CELLS B-2 AND B-3 ASH RESIDUE DISPOSAL AREA PARTIAL CLOSURE PROJECT
HARRISBURG INCINERATOR RESIDUAL DISPOSAL LANDFILL
DAUPHIN COUNTY, PENNSYLVANIA
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The Harrisburg Incinerator Residual Disposal Landfill is a 20 acre residual ash landfill located adjacent to the Harrisburg Incinerator, itself a municipal solid waste combustion facility, located in Dauphin County, Pennsylvania and owned and operated by the city of Harrisburg. Closure of the landfill is taking place in a series of construction projects to minimize the generation of leachate within the existing waste fueled by natural precipitation

This portion of the site closure consisted of the construction of a geosynthetic capping system representing approximately 6 acres of the landfill disposal area. This cap system consisted of (in ascending order): a 40mil textured LLDPE geomembrane, a double-sided geocomposite drainage layer, 18-inches of final cover soil and 6-inches of final cover (top) soil.

The site geosynthetics and soils placement construction began I April 2005 under the observation of Duffield Associates' representatives acting in the capacity of Construction Quality Assurance under direct contract to Pavex, Inc. The quality assurance assessments performed related to monitoring all field aspects of geosynthetics installation and oversight of all laboratory conformance test result review as well as laboratory and field tests relating to the final cover soils. Earthwork components of the project construction were completed by Pavex, Inc. of Camp Hill, Pennsylvania and geosynthetic installations were performed by Hallaton, Inc. of Towson, Maryland. Upon completion of the project, Duffield Associates compiled and wrote a construction as built certification document for review by the Pennsylvania Department of Environmental Protection (PA DEP) to certify that construction of the cap was performed in a manner consistent with site specification and PA DEP regulations.

Since 1991, Duffield Associates has also been engaged at this facility on an intermittent basis as the site construction quality assurance inspection firm for the cap closures of Cell A and Cell B-1 under different client entities, along with the original construction of Cell B-1 as a lined disposal area. For each of these construction projects Duffield Associates served as the certifying engineering firm to PADEP that the facility was constructed in accordance with its permit requirements.