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Mr. Timothy W. Crist, P.E. <br />February 26, 1996 <br />Page 2 <br />WOM <br />Comment No. 4 - Describe any procedures or plans you • - in place•r decanting the <br />residual water In the sedimentation basin between storm events. <br />Based on recent experience we don't expect the basin will ever fill up enough to have <br />to decant but if did we could pump the water to Little Johns Creek. <br />The City plans to conduct a soils investigation of the adjacent 126 acre borrow site to <br />confirm that soils of adequate quantity and quality are available for final and daily <br />cover needs (see attached letter from Robert Murdoch, P.E.). The location of soils <br />meeting final cover permeability requirements will be identified as part of the <br />investigation. With this knowledge, the City and landfill operator will closely monitor <br />excavation of the borrow area to be sure that soils meeting final cover permeability <br />requirements are saved for final cover. As an alternative to the compacted clay layer, <br />the City will also consider using a Geosynthetic Clay Liner (GCL). If we decide to use the <br />GCL alternative an additional 407,000 cubic yards of dirt will be available. <br />Comment No. 6 - Closure cost estimates should include the cost of constructing a test <br />pad and conducting appropriate quality assurance tests on the test pad in accordance <br />with 14 CCR Section 17774. <br />We will add $20,000 to the closure cost estimate to cover the cost of building a test pad <br />and conducting QA/QC tests on it. <br />Comment No. 7 - Provide additional information to demonstrate the quantity of soil <br />amendments and fertilizer will be adequate to sustain a vegetative cover. Also consider <br />the feasibility of preparing a demonstration plot to verify that the sterile soil being <br />produced from the on site borrow areas can be treated to sustain a vegetative cover. <br />