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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 />50 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 />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 />