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<br />3.32 Total Combustible Solids <br />Total combustible solid levels range from 5.9 to 87.7 percent in the over- <br />burden and from 7.8 to 97.8 percent in the underburden. Combustible solid <br />levels are highest for the coal strata and carbonaceous shale zones (75 - 90 <br />percent). Combustible levels for sandstone strata is between 5 and 10 per- <br />cent. All recoverable coal at Seneca is being mined. Therefore, no recla- <br />mation problems are evident from combustible solids. <br />3.33 Organic Matter <br />Organic matter contents range from 0.1 to 43.8 percent in the overburden <br />and from 0.2 to 28.1 percent in the underburden. Concenirotians generally <br />range from 2 to 8 percent. High organic matter zones are associated with <br />carbonaceous shale strata. The levels of organic matter are beneficial for <br />good reclamation. <br />3.34 Cation Exchange Caoacity <br />Cation exchange capacity levels range from I.0 to 41.6 meq/100 g in the <br />overburden and from 1.8 to 31.9 meq/ 100 g in the underburden. Exchange <br />levels generally range from 3 to 10 meq/100 g. Higher rntion exchange <br />capacities are associated with carbonaceous shale increments and high <br />organic matter topsoil zones. These levels of CEC are adequote for good <br />reclamation. <br />3.35 Soil Texture -Sand, Silt, and Clay Fractions <br />The overburden and underburden generally contains equal proportions of sand <br />and silt (35 - 40 percent each) with lesser amounts of clay (20 - 30 percent). <br />Higher clay percentages (>35 percent) exist in the southwestern and south- <br />eastern corners of the permit area near core hole locations 2614E and <br />2034E. The reclamation potential is good with the particle size fraction <br />ranges that occur at Seneca. <br />i <br />NOV 2 3 19tlI <br />6-152 <br />