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WMU FU-08 October 2008 <br /> Forward Landfill Project No.021605.08 <br /> .2 Subgrade Fill <br /> Subgrade fill is defined as the material placed on the 5:1 north slope overlying the <br /> former Austin Road Landfill. Subgrade fill material was placed in maximum 8-inch <br /> loose lifts and compacted with a CAT 815 sheepsfoot compactor. Moisture was <br /> added in place with a water truck and mixed into the soil with a motor grader. <br /> After the fill material was compacted, field density tests were conducted with a <br /> nuclear density gauge to ensure 90% relative compaction and moisture content <br /> within ±4% of optimum moisture content (ASTM D 1557). Test and sample <br /> locations for the foundation layer soils are included in Appendix C. <br /> Vector's CQA Monitor obtained samples of the material for CQA testing to ensure <br /> the material met the project specifications. Approximately 15,000 cy of Subgrade <br /> fill was placed. The CQA monitoring of the Subgrade fall placement included the <br /> following: <br /> ASk <br /> Atterberg i its and Graini l sis of Subgrade FillSoils: The CQA testing <br /> for the subgrade fill consisted of performing testing for Atterberg limit (ASTM D- <br /> 4318) and sieve analysis (ASTM D-422) at a frequency of one per 5,000 cubic yards <br /> (cy). Three (3) sieve analyses and Atterberg limit tests were performed. A <br /> summary of the test results is included in Table 4. Detailed results of the subgrade <br /> fill material testing are included in Appendix C. <br /> Modified Proctor (AST -1557): Vector's CQA Monitor performed three (3) <br /> moisture-density relationships (ASTM D-1557), which corresponds to a frequency of <br /> 1 per 5,000 cy. A summary of test results is shown in Table 4. Results of the tests <br /> are included in Appendix C. <br /> Vector Engineering, Inc.• 143E Spring Hill Drive•Grass Valley, CA 95945•(530)272-2448 <br /> -11- <br />