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The swell factor is calculated by relating the amount of fill material to the amount of <br />cut material. This factor is a percentage increase from the cut material. Prior to <br />determining the factor, the amount of coal material removed from the pit was subtracted <br />from the cut material volume as this cut volume represents the amount of overburden, <br />parting, and coal. Based upon the average tons per acre foot of 1504.378, the conversion <br />factor to obtain cubic yards of coal is 0.932466 tons per cubic yard and amounts to 20,656 <br />cubic yards of coal. <br />Results and Discussion <br />The swell factor is determined by dividing the total amount of noncoal fill material by <br />the total amount of noncoal cut material, subtracting the unit one and then multiplying by <br />100. Therefore, the swell factor is 14.99 percent. Considering that mining operations <br />are performed by scrapers and dozers, this factor is reasonable. <br />The designed po stmi ning topography landf orm presented in the November permit revision was <br />based on an estimated swell factor of 15 percent. As determined from this study, that <br />swell factor was indeed reasonable and the postmini ng topography derived from that swell <br />factor also reasonable. <br />