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WMU FU-08 October 2008 <br /> Forward Landfill Project No.021605.08 <br /> .3 Low Permeability Soil Liner <br /> A 2-feet thick LPSL layer was placed on the floor of WMU FU-08. Approximately <br /> 20,000 cy of material was utilized to construct the LPSL. The material was <br /> transported from the borrow area located east of the cell using CAT 627, CAT 623, <br /> and CAT 637 scrapers. The compaction of the liner soils was performed using a CAT <br /> 825 sheepsfoot compactor. As each lift was placed, the CQA Monitor observed that <br /> the surface of the lift was scarified and not smooth to assure that no distinct layers <br /> developed within the LPSL and that the specified lift thickness was achieved. <br /> Vector's CQA Monitor performed in-place density tests during LPSL construction, <br /> using the nuclear density gauge. The LPSL was placed at a minimum of 90 percent <br /> of the maximum dry density at three to seven percent above optimum moisture <br /> content, as determined by ASTM D 1557. Summaries of the field moisture/density <br /> testing are included in Appendix D. The required testing frequencies and number of <br /> Milk 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 LPSL material during placement. <br /> Atterberg Limits and Grain Size Analysis of Clay Liner Soils: The CQA testing for <br /> the LPSL soils consisted of performing testing for Atterberg limit (ASTM D-4318), <br /> sieve analysis (ASTM D-422), and sieve wash (ASTM D-1140), at a frequency of one <br /> 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. Eight (8) <br /> sieve analyses and Atterberg limit tests were performed. A summary of the test <br /> results is included in Table 5. Detailed results of the LPSL material testing are <br /> included in Appendix D. <br /> Vector Engineering, Inc. • 143E Spring Hill Drive•Grass Valley, CA 95945•(530)272-2448 <br /> -13- <br />