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WMU D-99 Construction September 1999 Forward Landfill Job No.986011.02 requirements of 90 percent of the laboratory maximum dry density. Results of the moisture-density testing and modified Proctor tests are presented in Appendix E. After the excavation/fill and subgrade foundation preparation was completed, a survey of the subgrade was performed to verify proper line and grade. Additionally, Vector's CQA Monitor verified the thickness of the fill by potholing in six locations. Thickness checks of the fill material are included in Appendix E. Prior to GCL installation on the slopes and geomembrane on the floor, Vector and the liner installer(GSE)walked the area and an Acceptance of Surface Condition form was signed by GSE and Vector. Signed Acceptance of Surface Condition forms are presented in Appendix F. 4.3 Clay Liner 4.3.1 Processing of Clay Liner Materials Vector's CQA monitor observed the processing of the clay liner material for the base liner of WMU D-99. The clay liner consisted of the select on-site material and imported Narco clay. The select material was placed on the mixing pad in a 0.75-foot lift. After the select material was graded to the desired thickness, the Narco clay was placed upon the select material to a thickness of 0.25 feet. A survey laser and a receiver on a road grader were utilized to control the thickness. The select material and Narco clay were processed to a depth of 12 inches utilizing a WR2500 and RS-650 mixer. Moisture was added concurrently during the mixing process to achieve the correct moisture condition. Vector's CQA Monitor performed moisture checks to ensure that the moisture content was 2 to 5 percent above optimum. During the processing activities, Vector's CQA Monitor observed and documented all aspects of the procedure. The select material, Narco clay, and the final admix clay liner soils were tested in Vector's on-site laboratory to verify the suitability of the material as a low permeable layer. Moisture-density relationship (ASTM D1557), Atterberg limits (ASTM D-4318) and grain size distribution (ASTM D-422)tests were performed on the clay liner material (including both select on-site material and Narco clay). Test results indicated that the clay liner material met the project specifications. Results Vector Engineering, Inc. - 12438 Loma Rica Dr.,#C - Grass Valley, CA - (530)272-2448 -7-