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i~ <br />,~ ~.o <br />this report will smmar'ite the results of an investigation conducted at the site <br />of the existing coal refuse Pile at the Southfield Mine Site of F~ezgy Fuels <br />peal, Inc, dear FlorenaE, Colorado. R~agulatioro of the Colorado Mine Land <br />Reclamation division zequire oohaction of the 0031 waste material to 90i of the <br />maxims dry density based on AASFiPO specification T99-74 (referenced density <br />obtained usin;(a s.s pavd hammer and a 1Z inch drop). It appears that the last <br />record of density tests being performai in the pile were in May o! 1982. '!he <br />puxpo~e of the density testing reported in thin doctianent is to update information <br />7 on densities adtiteved usixl our-rent axtstnx'tion practices in the pile. , <br />~e opal waste consists o! a mixture o! 2 reparate materials. <br />1) Fine waste (-28 mQSh) <br />7 =) Ooarae waste (everything larger than Z8 mesh) <br />'>he original repose pile design was based on a mixture ratio of a parts coarse to <br />1, part fire. Earlier ~vrk ooaq~leted by Ro~Y Mountain Ce+otec)u13ca1, mac, in <br />March of 1982, determined maximum dry densities from various blends frcm manse <br />acct fine material ranging frtm loos fine/oi coarse to Oi fine/100t ooarre with <br />intetloediate blends o! 25t, 504 acct 75i fines, r'espectivaly. Densities were <br />obsezved to vary Fran a lw of 71.4 pc! to 90 pcf with t2:e maxinum value of 90 <br />pd zepxrs~~ting the 7S; coarse/25i lire blend. <br />] 'l2~e original design a1BO assLnoed that the coarse acct fine materials would be <br />blettiai priar to disposal in the refuse pile. It is our underatandinq that at <br />this time, ~+^m and line materials era being disposed of in discrete, <br />segc~egated layers (l.e., they are not blended ar mixed prior to disposal). <br />1 'Ityer'efor"e, reference densities pertaining to the various blends of materials no <br />larger apply. All samples viii be dx~racterized either as firsa (maxiasmt dry <br />denecity of 71.5 pcf) or coarse (maximaa dry density of 86.1 pc!). <br />Also of concern is the effect o! the density and the layeri~ on the shear <br />strength and stability o! the refuse pile. Bulk samples of the weaker of the two <br />materials (i.a., the lines), have been obtained and tested is direct shear in <br />ordrs to determine the adequacy of original design assiaoptiona in' light of <br />caB:rent oonstsuction practices. <br />