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Elk Creek Mine Subsidence Page 12 <br />February 26, 2003 <br />Table 2. Interburden thickness and lithologic distributions <br />between coal seams. <br />Borehole Shale Sandstone Coal Total <br />Ident. ($ in ($ in ($ in Interburden <br /> section) section) section) Thickness <br /> (feet) <br /> "D".Seam to "C" Seam <br />WSC-1 28.5$ 70.9$ 0.6$ 192.1 <br />WSC-2 40.8$ 59.2$ 0.0$ 188.5 <br />WSC-4 49.0$ 59.3$ 1.7$ 199.3 <br />WSC-7 ----- ----- ----- 195.0 <br />Mean 37.8$ 61.5$ 0.8$ 193.7 <br />Std Dev 8.2$ 8.5$ 0.9$ 4.6 <br /> "D" Seam to "B" Seam <br />WSC-1 34.7$ 69.8$ 0.5$ 233.4 <br />WSC-2 ?39.5$ ?50.0$ ?0.0$ 223.1 <br />WSC-4 40.7$ 58.0$ 1.3$ 253.6 <br />WSC-7 ----- ----- ----- 241.7 <br />Mean ?36.8$ ?57.7$ ?0.6$ 238.0 <br />Std Dev 2.9$ 5.9$ 0.5$ 12.9 <br />-12- <br />