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`` rri • ..-?= u. s n CD-. any, Inc. <br /> C toner 28, 19177 <br /> of the coal refuse material indicate a plastic type of defy -ation, which <br /> is re2scnable to expect for cch 'sion2eSs - ~_erialS at 40 rcLnt relative <br /> density. <br /> 1 72 CO2ff 1C1cnt of for the coal ref se __.` Cr_al 5 Ge—_r-'_led <br /> using one of the fabricated s =-;pies and the "ur!d:sZurbed" Oe='_ son t:_ibe <br /> sa ple after consolidation to L,0.0 psi. The coeffic'_ent of er- ability <br /> -5 <br /> wasdet`rm -d to be 5. 4 x 10 cm/sec ( =• fti.r) for the i _ cr tory- <br /> abricated aL.pie and S.6 x 10 ocm/sec (9 ft/yr) for the " _ !c'_ tur 2d" <br /> sample. The apparent difference in perreability is probably due to the <br /> higher percentage of fines in the "undisturbed" sample (23 percent) Com- <br /> pared to those in the fabricated sample (17 percent) . <br /> Detailed test results for the coal refuse material are presented on Figures <br /> 1 through 5. Water content and dry density data are presented in Table 1. <br /> Specific gravity data are presented in Table 2, and partial gradation <br /> results for all 6-inch-diameter Dennison samples are presented in Table 3. <br /> B. Foundation '_Materials <br /> Four of the nine drill holes (Drill Holes 3 through 6) were located off <br /> the existing dump in the immediately adjacent area that will form the <br /> foundation for the new dump area. The total depths of boring from the <br /> four exploratory holes were 31.5 feet, 16 feet, 30.0 feet, and 26.0 <br /> feet, respectively. Materials recovered from the drill holes fell into <br /> two basic soil types--(1) a moderate to highly plastic clay (CL/CH) , <br /> or (2) a gravelly, silty to clayey sand (SM) . The gravelly, silty to <br /> clayey sand was generally very dense and exhibited an average dry density <br /> in excess of 110 lb/ft3 (see Table 1) . No Shelby tube samples were <br /> obtained within this material and the only tests that could be made from <br /> the driven Dames & Moore ring samples included gradation and water <br /> content-dry density determinations. <br /> p. nccnri�t�c <br />