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WMU FU-06 November 2006 <br /> Forward Landfill Project No.021605.07 <br /> ® CQA Monitor and signed by GSE prior to geosynthetic placement. Subgrade <br /> acceptance forms are presented in Appendix E. <br /> 4.3 Clay Liner <br /> A 2-feet thick clay liner layer was placed on the floor of WMU FU-06. Approximately <br /> 26,000 cy of material was utilized to construct the clay liner. The material was <br /> transported from the clay stockpile located directly east of the cell using CAT 633 <br /> scrapers. The compaction of the liner soils was performed using a CAT 825 <br /> sheepsfoot compactor. As each lift was placed, the CQA Monitor observed that the <br /> surface of the lift was scarified and not smooth to assure that no distinct layers <br /> developed within the clay liner and that the specified lift thickness was achieved. <br /> Vector's CQA Monitor performed in-place density tests during clay liner construction, <br /> using the nuclear density gauge. The clay liner was placed at a minimum of 90 <br /> ® percent of the maximum dry density at three to eight percent above optimum <br /> moisture content, as determined by ASTM D 1557. Summaries of the field <br /> moisture/density testing are included in Appendix D. The required testing <br /> frequencies and number of tests taken are presented in Table 1. <br /> Vector's CQA Monitor also performed moisture-density relationship (ASTM D-1557) <br /> tests, Atterberg limits (ASTM D-4318) and grain size distribution (ASTM D-422) <br /> tests on the clay liner material during placement. <br /> Atterberg Limits and Grain Size Analysis of Clay Liner Soils: The CQA testing for <br /> the clay liner soils consisted of performing testing for Atterberg limit (ASTM D- <br /> 4318), sieve analysis (ASTM D-422), and sieve wash (ASTM D-1140), at a frequency <br /> of one per 2,500 cy. In addition, visual soil descriptions and soil classifications were <br /> performed on the samples collected for Atterberg limit and sieve analysis. Twenty <br /> is (20) sieve analyses and Atterberg limit tests were performed. A summary of the <br /> Vector Engineering, Inc. • 143E Spring Hill Drive•Grass Valley,CA 95945•(530)272-2448 <br /> -13- <br />