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File No. 20-1008-36 July 14, 1995 clay (by dry weight) and 95 percent compaction for a minimum of 20 percent of red clay. It is recommended that the moisture content of the soil/clay mixture be at least 2 percent over optimum. We note that borrow soil amendment studies show that an increase of 5 percent relative compaction (95 versus 90 percent) results in an order of magnitude decrease in permeability. Test results indicate that some variability exists in the stockpile materials; however, by the time this material is loaded into trucks, dumped at the existing site, spread and mixed, the likelihood of variability is low. 2.5 CONSTRUCTION The SJDPW will perform construction of the foundation layer using experienced equipment operators. As mentioned previously, the SJDPW will hire a qualified earthwork contractor to construct the clay barrier and vegetative layers. The SJDPW construction team for the project is described in Chapter 3, Project Organization. 2.6 CQA TESTING All CQA testing will be performed according to requirements of Section 17774, Title 14 as described in this document. As indicated in 2.1, SJDPW will carry out field and laboratory testing of the vegetative layer. Meinfelder, as construction monitor, will also perform a limited number of tests on these layers to confirm the results obtained by SJDPW staff. Kleinfelder, as CQA Monitor, will perform all of the CQA testing of the barrier layer. Kleinfelder performed all CQA testing of the test pads previously constructed. A copy of our report for the test pads is included in Appendix E. Sanguinetti and Associates, as a subcontractor to Meinfelder, will perform grade control for the foundation, barrier, and vegetative layers. • The test methods and frequency for CQA testing are specified in Sections 7 and 8. CQA testing for correction of deficient construction is in Section 9. GSM.md CH/95 Page 9 of 31 July 14, 1995 20-1008-36(CQACOR) Copyright 1995,Kleinfelder,Inc.