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WMU FU -03, WMU F -West Leachate Impoundment and Desilting Basin February 2004 Forward Landfill Job No. 021605.03 the maximum dry density at three to eight percent above optimum moisture content, as is determined by ASTM D 1557. Summaries of the field moisture/density testing are included in Appendix D. The required testing frequencies and number of tests taken are presented in Table 1. Vector's CQA Monitor also performed moisture -density relationship (ASTM D-1557) tests, Atterberg limits (ASTM D-4318) and grain size distribution (ASTM D-422) tests on the clay liner material during placement. The CQA testing for the clay liner soils consisted of performing testing for Atterberg limit (ASTM D-4318), sieve analysis (ASTM D-422), and sieve wash (ASTM D-1140), at a frequency of one per 2,500 cy. In addition, visual soil descriptions and soil classifications were performed on the samples collected for Atterberg limit and sieve analysis. Ten (10) sieve analyses and ten (10) Atterberg limit tests were performed. The percent minus the No. 200 sieve for the clay liner material ranged from 60.8% to 77.7%. The liquid limit and plasticity index for the clay liner material ranged from 29 to 37 and 10 to 16, respectively. A summary of the test results is included in Table 4. Detailed results of the clay liner material testing are included in Appendix D. e Modified Proctor (ASTM D-1557) Vector's CQA Monitor performed eight (8) moisture -density relationships (ASTM D- 1557) for compaction references, which corresponds to a frequency of one per 5,000 cy. A summary of test results is shown in Table 4. Results of these tests are included in Appendix D. Hydraulic Conductivity Ten (10) in situ soil samples were collected during placement and compaction of the clay liner and tested for permeability in Vector's Grass Valley laboratory. Falling head, rising tail water tests were performed in the laboratory according to the procedures outlined in ASTM D-5084. The permeability of the samples met the specified value of 3.1 x10$ cm/s or lower. Results of the laboratory permeability tests of the clay liner are presented in Appendix D. Table 4 presents a summary of the clay liner permeability tests. Table 4 — Clay Liner Laboratory Testing Summary 0 Vector Engineering, Inc. - 143E Spring Hill Drive - Grass Valley, CA 95945 - (530) 272-2448 -13-