Laserfiche WebLink
• dry density as determined by ASSHRTO T99- 70 /ASTM D698 -70 Standard Proctor <br />Compaction. <br />A limited sample of the coal processing waste was collected by WFC. While there was <br />insufficient sample to conduct moisture density and shear strength testing, enough material was <br />available for identification testing. A grain size distribution of the material is shown in Figure <br />12, Grain Size Distribution, Coal Processing Waste. By the Unified Soil Classification System, <br />the waste classifies as a GW soil which is a well graded sandy gravel. It was expected that many <br />of the larger grain sizes would break down during placement and compaction of the waste <br />material. This would result in a more sand -like granular deposit. <br />Since extensive testing would not be conducted until representative refuse material was <br />generated by the plant, the density and strength of the spoil material was estimated using Bureau <br />of Mines Report of Investigation 7964 titles "Physical Property Data on Coal Waste <br />Embankment Materials ". By averaging data from seven similar waste sites presented in this <br />report, the parameters presented below were selected for use in this analysis. <br />Selected Material Parameters <br />Parameter Selected Value <br />In -place density (psf) <br />Dry, yd 90 pcf <br />Wet, yw 104 pcf <br />Angle of internal friction, 0/ 33.4 degrees <br />Cohesion, c (psf) 446 psf <br />As mentioned, the majority of the area is underlain by consolidated materials. Strata of this <br />nature are relatively strong and not subject to differential <br />TR -53 2.05 -39 revised 115111 <br />