Neal Road Landfill
Neal Road Landfill

Holdrege & Kull provided construction quality assurance (CQA) engineering services on three separate projects involving final cover construction and base liner construction at the landfill between 2004 and 2007.  H&K provided field testing and construction quality control observation during placement and compaction of low permeable clay layers; deployment of geomembrane and geocomposite layers; placement and compaction of the vegetative soil layer; installation of storm water drainage and collection system; and installation of landfill gas extraction wells, perimeter monitoring wells, and the gas flare and collection system.  Our CQA Monitor provided oversight of field testing and observation, laboratory material testing activities, and report preparation.  Following completion of the construction activities, H&K prepared final construction certification documents.

H&K provided CQA services for construction of the Class II Leachate Surface Impoundment base liner system during the summer and fall of 2004. H&K’s CQA oversight required testing and observation during construction of the following:

  • Construction and testing of a low permeability test pad
  • Clearing and stripping of vegetative material, excavating approximately 138,500 cubic yards (cy) of native subsurface material
  • Placement and compaction of a 12-inch thick low permeability soil liner over the excavated ponds and general fill area with a maximum permeability of 1.0E-6 cm/sec
  • Installation of about 324,000 sf of 60-mil thick, high density polyethylene (HDPE) geomembrane
  • Installation of about 162,000 sf of geosynthetic clay liner
  • Installation of about 162,000 sf of leak detection geonet and associated pipelines, gravel, sumps, and pan lysimeter
  • Preparation of Draft and Final CQA Reports

During Phase 2, H&K provided CQA monitoring services for closure improvements of Modules 1, 2, and 3 and during final closure of Modules 1 and 3.  H&K’s CQA oversight required testing and observation during construction of the following elements:

  • Clearing, stripping, and grading
  • Construction of two low permeability test pads for evaluation of two different low permeability materials
  • Placement and compaction of foundation soil obtained from an onsite borrow area
  • Placement and compaction imported low permeable clay soil. The 12 inch thick low permeability clay soil layer was required to have a compacted in-place a maximum permeability of 1.0E-5 centimeters per second (cm/sec)
  • Installation of 40 mil, double-sided, textured, high density polyethylene (HDPE) geomembrane
  • Installation of geocomposite drainage net on slopes that exceed a slope geometry of 2H:1V feet (horizontal to vertical)
  • Placement of vegetative soil layer comprised of 50 percent import clay material and 50 percent onsite soil material
  • Construction of landfill gas extraction system, and perimeter vadose zone monitoring probes
  • Installation of the landfill storm water drainage systems
  • Preparation of Draft and Final CQA reports