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State Reg. <br />the volume of coal removed from January 1982 through August • <br />1983. <br />The swell factor calculation progressed as follows: <br />Vnlnmo 81 <br />Difference between premining contours and <br />graded-as-of-September 1 (1983) contours <br />outside of the coal removal area. 137,800 yd3 <br />Vnlnmo $9 <br />Difference between premining contours and <br />top of coal contours inside the coal <br />removal area. 3,197,300 yd3 <br />Volume #3 <br />Difference between graded-as-of- <br />September 1 (1983) contours and top • <br />of coal contours inside of the <br />coal removal area. 2,860,600 yd3 <br />Volume #4 <br />Reported acre-feet of coal removed <br />from January 1982 through August <br />1983 was 516.1257 acre feet within <br />an area of 36.3 acres. 832,700 yd3 <br />Formula: V = Volume <br />Y1 + V3 + V4 - Y2 = Difference Pre- and Post <br />Difference Pre and Post V =Swell Factor <br />2 <br />137,800 yd3 + 2,860,600 yd3 + 832,700 - 3,197,300 yd3 = <br />633,800 yd3 difference <br />633,800 yd3 s 3,197,300 yd3 = 19.8% Swell <br />The 19.8°.6 swell factor calculated here is within approximately • <br />4.5% of the 15.3% estimated for the Wadge areas. It appears as <br />12-63 <br />Revised 8/27/86 <br />