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V. ENGINEERING PROPERTIES OF SITE SOILS <br />A. LABORATORY TESTING <br />Laboratory tests were run on soil samples obtained during the field <br />investigation. Bulk samples were classified using Atterberg Limits <br />and percent passing the No. 200 sieve. Compaction curves and.remolded <br />permeability tests were also conducted on selected bulk samples to <br />evaluate their suitability for use as soil liner and cover material. <br />Undisturbed samples were evaluated for strength properties using <br />direct shear and unconfined compressive strength tests. The strength <br />test results will be used in future slope stability analyses specified <br />in the Subchapter 15 regulations. Summaries of laboratory test <br />results are presented in Appendix G. <br />Laboratory classifications confirmed field descriptions. Testing <br />focused on fine-grained soils with potential use in landfill construc- <br />tion. Fine-grained soils described in the field as clays and silts <br />were classified by testing to be primarily CL (clay) and ML (silt), <br />respectively. Sand content of fine-grained soils within the 0 to <br />20 feet interval ranged from less than 5 to 50 percent. <br />Silty sand samples tested were found to contain between 39 and 47 per- <br />cent fines. It should be remembered that soil materials from shallow <br />depths at the site vary gradationally, both vertically and horizon- <br />tally, with respect to fine-grained versus coarse-grained characteris- <br />tics. Isolated samples do not necessarily indicate consistent lithol- <br />ogies across the site. <br />Samples of soils to approximately 9-1/2 feet from Borings P-1 and P-2 <br />were tested for compaction characteristics and remolded permeability <br />to ascertain the suitability of available on-site material for use as <br />cover and in construction of retention structures. The permeability <br />of the soils classified as ML and CL was determined to range from <br />PJ9 9390206.00D 16 <br />