Ocean County Landfill Corporation – Engineering, Permitting, and Environmental Monitoring for Ocean County Landfill
Successful design and permitting of sustainable landfill project.
Cornerstone’s principals have worked with Ocean County Landfill Corporation on the Ocean County Landfill (OCLF) in Manchester, NJ, since the 1980s, providing environmental engineering and consulting services, including landfill design and systems analysis, civil and site work, permitting, air compliance, environmental monitoring services and general engineering oversight. Most recently, Cornerstone provided permitting, environmental planning, and engineering services for a state-of-the-art landfill cell to be constructed on top of a previously filled portion of the MSW landfill, a 60-acre unlined cell.
OCLF consists of approximately 300-acres of landfill area and annually processes roughly 500,000 tons of municipal solid waste (MSW). The facility uses a double composite baseliner and collected leachate is directed to an onsite pre-treatment plant. Thirty-six groundwater monitoring wells surround the OCLF.
To control landfill gas (LFG) emissions, Cornerstone has developed a horizontal gas collection system to capture the LFG, which is delivered to two independent LFG-to-energy facilities where it is treated and used to produce electricity. Combined, the two facilities have the capacity to generate approximately 13.9 MW of electricity.
OCLF conducts interim operations using temporary cell capping, which allows for future permitted overfilling. Cornerstone has developed a program that allows OCLF to install a leachate recirculation system within the temporary cap system. OCLF has installed leachate recirculation lines on more than 130 acres of the landfill.
Cornerstone also designed and permitted an on-site transfer station to be used to handle municipal solid waste and construction and demolition debris. Other work includes developing the facility’s Title V operating permit renewal applications and preparing the NSPS/NESHAP and Title V semi-annual reports and annual emission statements.
The engineering design for the recently permitted overfill area, referred to as the sustainable landfill project (SLP), began with a test pit program to obtain waste characterization data to assist with the subgrade layout, geotechnical analysis and gas system design. Ultimately the SLP subgrade and overliner components were designed to account for the differential settlement of the underlying waste and the new cell allows sustained landfilling within the previously permitted footprint for an extended period of time.