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dry density as determined by ASSHTO T99-70/ASTM D698-70 Standard <br />• Proctor Compaction. <br />A limited sample of the coal processing waste was <br />collected by WFC. While there was insufficient sample to conduct <br />moisture density and shear strength testing, enough material was <br />available for identification testing. A grain size distribution of <br />the material is shown in Figure 13, Grain Size Distribution, Coal <br />Processing Waste. By the Unified Soil Classification System, the <br />waste classifies as a GW soil which is a well graded sandy gravel. <br />It was expected that many of the larger grain sizes would break <br />down during placement and compaction of the waste material. This <br />would result in a more sand-like granular deposit. <br />Since extensive testing would not be conducted until <br />represen-tative refuse material was generated by the plant, the <br />density and strength of the spoil material was estimated using <br />Bureau of Mines Report of Investigation 7969 titled "Physical <br />Property Data on Coal Waste Embankment Materials". By averaging <br />data from seven similar waste sites presented in this report, the <br />parameters presented below were selected for use in this analysis. <br />Selected <br />Parameter <br />• In-place density <br />Dry, yd <br />Wet, yw <br />Angle of internal <br />Cohesion, c (psf) <br />As mentioned, <br />consolidated materials <br />strong and not subject <br />~, <br />Material Parameters <br />Selected Value <br />(psf <br />friction, 0/ <br />90 pcf <br />109 pcf <br />33.4 degrees <br />996 psf <br />the majority of the area is underlain by <br />Strata of this nature are relatively <br />to differential <br />~~ 198 <br />20539.626 2.05-39 revised 10/23/97 <br />