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<br />1 ~. <br />4. WELL FIELD HYDRAULICS <br />' 4.1 ANALYSIS OF STEP-DRAWDOWN TEST DATA <br />As indicated in section 3.2, the step drawdown test consisted of <br />3 steps. Calculated specific capacity for step 1, 2, and 3 are <br />100, 78, and 75 gpm per foot of drawdown, respectively. Using <br />this specific capacity and the estimated aquifer thickness of 50 <br />feet (from the drilling completion information) the alluvial <br />transmissivity would be in the approximate range of 100,000 <br />gal/day-f t. <br />This value for transmissivity is several orders of magnitude <br />' higher than values obtained for the bedrock material. <br />Therefore, the controlling factor for estimation of pit inflows <br />' would be the bedrock characteristics. For this reason, after <br />consultation with the CMLRD, it was decided by the CMLRD that a <br />' long term constant discharge test was not required in order to <br />define Stollsteimer Creek alluvial properties. <br />' 4.2 ANALYSIS OF CONSTANT DISCHARGE TEST DATA <br />The evaluation of the constant discharge test data is summarized <br />in Appendix B. A mean value for transmissivity using drawdown <br />' and recovery data has been calculated to be 210 gal/day-ft with <br />a storativity of 1.3x10'4. The hydraulic conductivity for the <br />t Fruitland Formation is approximately 4 gal/day-ft"2 when the <br />aquifer is assumed to be 50 feet thick within the Barren Ridge <br />study area. <br /> <br />1 <br /> <br />D R M~Enu6 •SSOC~~~tS LiMitEO <br />