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Northern Portion of WMU FU-06 August 2006 Forward Landfill Project No.021605.07 4.0 WMU FU-06 CONSTRUCTION As construction was implemented, Vector performed CQA monitoring. This section describes the CQA tasks associated with the construction of the earthworks and geosynthetic components of the northern portion of WMU FU-06. 4.1 Grading and Perimeter Berm Guinn graded the existing surface to achieve the design grades and constructed a perimeter berm around the northern portion of WMU FU-06. Grading was kept to a minimum to maintain the existing final cover. The soil material used for construction was obtained from an on-site borrow source and transported to the northern portion of WMU FU-06 by scrapers, placed, and compacted. The perimeter berm was constructed to the lines and grades shown on the construction drawings. Vector's CQA monitor observed that the material used to construct the berm did not have rocks or clods larger than 3 inches. Upon completion of the subgrade and perimeter berm construction, Guinn and Centerline Land Surveying, Inc. surveyed the as-built conditions. Centerline completed an as-built survey, including the perimeter berm and leachate collection trenches, and is included in Appendix G. 4.2 Perimeter Berm Geomembrane Following construction of the subgrade, a 60-mil smooth HDPE geomembrane was placed over the temporary perimeter berm. The HDPE geomembrane was supplied and installed by GSE of Houston, Texas. Vector's CQA Monitor observed the installation of the geomembrane. 4.2.1 Receiving Inspection Upon arrival by truck shipment, Vector's CQA monitor observed the unloading and storage of the geomembrane rolls. Each roll of geomembrane was logged in by roll number and then crosschecked against the quality control documents provided by the supplier. Following the inspection and approval of QC certifications, the Vector Engineering,Inc.•143E Spring Hill Drive•Grass Valley,CA 95945•(530)272-2448 -6-