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FPA provided design engineering services in connection with the construction of three new solid waste cells at the Middlesex County Landfill.  The new cells encompassed approximately 75 acres and utilized a “piggy-back” design, over the existing Phase I previously capped landfill. The construction involved the placement of approximately one million cubic yards of controlled fill and approximately 6.5 million square feet each of HDPE liner, Geocomposite clay liner and structural geogrid subgrade reinforcement. Our design work included generation of soil parameters and landfill waste parameters, slope stability analyses of landfill side slopes, settlement analyses of the compressible waste material and evaluation of the performance of the proposed leachate collection and conveyance system. Our services also included the preparation of plans and specifications for the construction of the double-composite liner system, submission to NJDEP for approval, Resident Engineering Services, Contract Administration including shop drawing and submittal reviews, and Quality Control testing during construction. This project construction cost was $86 million.


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