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n <br />~~ <br />Table 1, Ground Water Quality - Fault Zone No. 5 Mine indicates that the <br />water is of virtually identical chemistry to the rest of the mine <br />inflow. Therefore, it is unlikely that the source of inflow is directly <br />from sources other than bedrock units, which exhibits markedly different <br />chemistry from the mine inflow water. <br />Predicted Inflows <br />Ground water inflow analyses were performed on the No. 5 Mine inflows. <br />An additional analysis was also performed on the 2 West Main inflow in <br />the No. 5 Mine. The projected mine inflows were made assuming an <br />aggressive mining sequence with completion of all mains in the-No. 5 <br />Mine in 1984. Less aggressive mining sequences would produce smaller <br />maximum inflows for the mines. <br />Three (3) types of analysis were performed to estimate future mine <br />inflows: 1) Thiem's (1906) steady state well formula, 2) Jacob and <br />Lohman's (1952) formula for nonsteady flow to a well of constant <br />drawdown, and 3) McWhorters (1981) methodology for calculating inflow to <br />mines from a coal seam. Because Empire Energy has no direct <br />measurements of the hydrologic properties of the coal, estimates have <br />been made. Transmissivity (T) and storativity (S) values for equivalent <br />coal beds at the nearby Northern Coal Mine were obtained. Specific <br />yield (Sy) was estimated to be 0.10. Although the coal thickness (b) <br />can vary, an average thickness of 12 feet was used. These values were <br />then applied to the McWhorter method and used to try to duplicate the <br />past measured flows. The values of T and S were varied until a <br />reasonable match to observe flows was obtained. The values of T and S <br />that produced the best were 30 ftz/day (225 .gpd/f t.) and 0.002 <br />respectively. It was found that the values for transmissivity and <br />storativity produced a reasonable fit to observed flows in the No. 5 <br />Mine. These values are 225 gpd/ft and 0.002 respectively. <br />r~ <br />~J <br />-3- <br />