Projects details

Landfill Cap


Location: Toms River, New Jersey
Value: $ 2,000,000
Panther was awarded a contract to provide environmental capping and other services for an industrial waste landfill located on the coast of southern New Jersey near Toms River. Challenges included the effects of hurricane Irene, tropical storm Lee and the continuous onset of significant precipitation events since project startup. The main portion of the project involves the removal of temporary capping materials and the installation of new multi-layered engineered caps (geosynthetics and soil) covering approximately six acres comprising two of the landfillís cells. Other work at the site involved clearing and preparation of a borrow area, excavation, relocation and placement of 30,000 CY of fill materials and the rehabilitation of the leachate collection systems and infrastructure enhancements. Upon contract execution, Panther prepared site specific work plans, including a HASP and a CQCP as well as numerous other project submittals. Once planning activities were completed, Panther mobilized personnel and heavy equipment, as well as storage facilities and materials. Site preparation activities were fairly extensive and involved a pre-construction photo survey, topographic surveys of all work areas, including a borrow area, centerlines of existing piping, and the verification of existing grades and limits to validate baselines prior to disturbance. In addition, Panther installed a stabilized construction entrance, made improvements to 3,400 feet of haul roads, and placed 1,700 feet of super silt fence. Panther utilized the services of a land clearing subcontractor to remove and chip trees, stumps and woody vegetation from approximately 1 acre of the 2.5 acre borrow area. Panther stripped and stockpiled existing topsoil from the on-site borrow area. Other preparatory work involved the removal of debris, and the lock-out/tag-out and removal of some electrical components associated with the leachate collection systems. After site preparation activities were completed, Panther began construction activities at the first cell. Initial actions involved the removal and relocation of sand bags from the surface of the temporary 1.9 acre Hypalon liner on the northern slope of the cell. Panther also stripped off and staged the existing 3-feet of cap soils to expose the existing PVC cap liner so that the new PVC liners and drainage geocomposite could be installed on the northern slope. Once the existing cap components were exposed and cleaned off, a specialty liner installer was mobilized to the site for installation of the new 30 mill PVC liner layers separated by a double-sided drainage geocomposite. Following installation of the PVC liner layers, Panther covered the 1.9 acre slope with an 18-inch layer of drainage sand (~5,000 CY) excavated and relocated from the borrow area. An 8-ounce separation geotextile layer was installed over the drainage layer sand by the specialty liner installer and subsequently covered with a 12-inch layer of compacted structural fill and 6-inches of topsoil. Additional work around the first cell included the removal of 300 LF of above ground leachate discharge piping and electrical conduits, removal, repainting and reinstallation of a 25-foot steel access structure for the leachate wet well, replacement of the leachate discharge pump and piping, as well as electrical controls and supply systems. The second major part of the project involved the removal of the existing 4-acre Hypalon liner from the second cell, regrading of the landfill cell surfaces and installation of GCL, 40-mil textured VFPE liner and double-sided drainage composite. The geocomposites were covered with an 18-inch layer of drainage sand excavated and relocated from the borrow area. Next, the drainage sand layer was covered with an 8-ounce separation geotextile followed by 12-inches of compacted structural fill and 6-inches of topsoil. In addition to cap construction, leachate force mains were replaced with new piping systems as well as electrical supply and control conduits and wiring. Steel access structures to the leachate collection wells were repainted and non-functional electrical components were replaced. All landfill cell preparation work was performed in concert with the specialty liner installers such that geosynthetics installation work and Pantherís earthwork could be performed unimpeded and in the most efficient sequence. Subsequent to the capping work on first and second cells, 4,200 SY of existing temporary liner was removed from the slopes of a third cell and the slopes were re-graded, covered with topsoil and seeded. The slopes will also be covered with permanent erosion control matting. Finally, a fourth cell in the secure landfill area was re-graded to provide a less steep 3:1 slope. The slopes were covered with a layer of topsoil, seeded and protected with erosion control matting. During the entire process QA/QC procedures were strictly adhered to and involved testing of materials prior to installation, and the close monitoring of installation methods followed by inspection and approval by the clientís Engineer. In addition to the civil construction effort described above, Panther was also tasked with rehabilitating, maintaining and upgrading various other components of the landfillís infrastructure. This other work included vertical extension of concrete footers supporting the landfillís elevated steel walk-way such that the footers are above the surface of the new cap system. The walk ways were cleaned and painted. The existing insulation and heat tracing on the above-grade leachate force mains were replaced. Significant upgrades were made to the leachate collection and leak detection system. These upgrades included: installation of several new NEMA control panels and junction boxes, level sensors and cable, submersible pumps, data loggers, and other miscellaneous electrical repairs. Finally imported topsoil was placed on all slopes which were hydro-seeded and protected with straw and fabric. Now that all land disturbance activities are complete and grass is growing, Panther is preparing remove the temporary erosion control measures, equipment and field staff from the site. The project was performed within budget and without a single safety incident.

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