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• Additional aquifer tests were performed on monitor wells <br />SA, SB and SC to determine how the hydraulic properties of the <br />strata in Pit 2 compate to those in Pit 1. These three wells <br />were chosen to be representative of the Pit 2 area because they <br />fall near the center of the region to be mined and also because <br />they are located on the nose of the anticline. <br />Aquifer tests on these wells were conducted using the slug <br />test (recovery) method. This analysis involves removing a "slug" <br />of water instantaneously from the well bore and subsequently <br />measuring the recovery of the water level through time as it <br />reestablishes hydrostatic equilibrium. The volume of water removed <br />was accomplished using a weighted ten foot section of 3" SCH 40 PVC <br />pipe which is sealed on the bottom. The pipe is inserted in the 4" <br />test well casing and is filled with water. Quick removal of this <br />pipe container constitutes the instantaneous displacement of water <br />in the test well. The initial water level of the well after removal <br />• of the "slug" is quickly measured so that an accurate volume of <br />water displaced at time t = 0 can be calculated. <br />Analysis of Tests <br />The slug recovery tests were conducted according to the <br />same procedures outlined in the tests performed by Willard Owens <br />Asscciates on Pit 1 (see report at the end of this Appendix). The <br />resultant recovery is plotted against the reciprocal of time to <br />obtain the transmissivity and then the hydraulic conductivity <br />(permeability) of the zone tested. The results of these tests are <br />documented in Table 18. The data and Recovery vs. Reciprocal of <br />Time graphs for the tests are found at the end of this Appendix. <br />For all calculations, the following definitions and equations <br />apply: <br />L J <br />-65- <br />