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' consultant. Permeability of the saturated aquifer material was found <br /> to be 9 x 10-3 cm/sec at depths of 130 to 160 feet. <br /> 3.3 ENGINEERING PROPERTIES OF SOILS <br /> ' Laboratory classification testing confirmed field descriptions. Test- <br /> ing focused on fine-grained soils with potential use in landfill con- <br /> struction. Fine-grained soils described in the field as clays and <br /> ' silts were classified by laboratory testing as CL and ML by the <br /> Unified Soil Classification System. Sand content of fine-grained <br /> soils within 0- to 20-foot-depth intervals ranged from less than 5 to <br /> i50 percent. Silty sand samples were found to contain between 39 and <br /> 47 percent fines (i .e. , materials passing No. 200 sieve) . <br /> ' Selected samples of soils from within the anticipated depth of site <br /> P P P <br /> ' excavations were tested for compaction characteristics and remolded <br /> permeability to ascertain the suitability of available on-site materi- <br /> al for use as cover and in constructing retention structures. The <br /> permeability of soils classified as ML and CL was determined to range <br /> from 1 x 10-6 to 1 x 10-8 cm/sec when remolded at 95 percent relative <br /> compaction (ASTM Test Designation D1557-78A) . A complete discussion <br /> of laboratory soils testing is presented in EMCON's attached geologic <br /> ' and hydrogeologic report (see Appendix A) . <br /> ' PJ9 9390209A.00D 9 <br /> ' E(i1COf1 Associates <br />