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<br />' facility and collection pond. Based on these model analyses, we will make a recommendation <br />whether the newly-installed monitoring wells, in conjunction with M-9, can control the local <br />ground water gradient, or whether additional monitoring points will be necessary to create a <br />' hydraulic barrier downgradient from the tailings facility and collection pond and/or to adequately <br />monitor water quality conditions downgradient of these facilities. <br />The proposed depths for the additional wells are based on providing a similar elevation <br />completion as well M-9, or a similar completion interval if the saturated interval in M-9 can be <br />correlated to the new locations. The well construction details for this monitoring well are shown <br />in Figure 3. <br />SUMMARY <br />' The following modifications are proposed to the currently-approved surface and ground water <br />monitoring plan associated with the San Luis Gold Project (Permit No. M-88-112): <br />(1) Two additional ground water monitoring wells will be installed northwest and <br />' southwest of the tailings facility and the collection pond at the locations shown <br />in Figure 2. <br />(2) The additional ground water monitoring wells will be completed similarly to the <br />currently-installed well M-9. <br />(3) The magnitude and direction of ground water flow will be developed from the <br />data generated from the two new wells, plus well M-9. <br />' (4) Pump tests will be conducted at each of three well sites (M-9 and the two new <br />sites) to determine aquifer hydraulic characteristics for input to a ground water <br />model to evaluate what well configuration and pumping rates will be necessary <br />to control the ground water gradient. <br />' -4- <br /> <br />