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Robert Evans <br /> December 16, 1993 <br /> Page 2 <br /> 3 . on page 3 of the Kleinfelder report, the hydrometer analyses <br /> results indicate that all three test pads have greater than 30 <br /> percent passing the minus No. 200 sieve. The combination silt <br /> and clay passing percentages comprise the minus No. 200 <br /> results. The minus No. 200 results for the ML, SP/SM, and SM <br /> test pads are 64%, 36%, and 36%, respectively. None of the <br /> tests pads were classified after the addition of Ione clay. <br /> The actual USCS classification for the ML test pad is sandy <br /> clay (CL) . The classification for the SP/SM and SM test pads <br /> is clayey sand (SC) . <br /> 4 . The County installed an SDRI on the SM and Ione clay mixture <br /> test pad. The results of this SDRI are attached. The results <br /> show that the SM material meets permeability requirements. <br /> The average readings were approximately 4 x 10-7 cm/sec. <br /> Therefore, the conclusion in the Kleinfelder report that the <br /> SM and ML materials would be satisfactory is confirmed. <br /> 5. The SDRI shows that field permeabilities were very near the <br /> laboratory permeability. <br /> Required tasks for the County to perform are listed on page 3 of <br /> your letter. Responses to Nos. 1 through 5 are outlined below: <br /> 1 . It was proven prior to test pad construction that the <br /> foundation layer could be compacted to at least 90% relative <br /> compaction (see response 11 above) . Compaction of the <br /> foundation layer will be further verified as closure <br /> operations proceed. <br /> 2 . The County will remove the entire SP/SM test pad prior to <br /> final cover placement as requested. It is proposed that the <br /> SM and ML test pads remain in place since the SDRI results for <br /> the SM material show that it meets permeability requirements. <br /> Continuity may be maintained by reworking, moisture <br /> conditioning, and recompacting these test pads during cover <br /> placement. <br /> 3 . Although pertinent compaction curve data is presented on page <br /> 1 of Table I of the Kleinfelder report, copies of the <br /> compaction curves are attached. <br /> 4 . Since the SM material meets permeability requirements, it will <br /> be used whenever possible. We believe that the ML material <br /> would easily meet permeability requirements based on the SDRI <br /> on the SM material . Therefore, ML will also be used for final <br /> cover placement when encountered. In addition to the existing <br />