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~1 • <br />' Figure 1 shows the current surface water and ground water monitoring system associated with <br />' the San Luis Gold Project. The area of concern expressed by the CMLRD staff is in tl~e vicinity <br />of the tailings facility and collection pond (near wells M-6, M-7, M-8 and M-9). <br />To develop additional information related to the local ground water gradient, it ins proposed that <br />' two additional monitoring wells (designated M-12 and )\4-13) be installed at the locations shown <br />in Figure 2. These locations should allow the development of the local ground water gradient <br />' in terms of magnitude and direction, while at the same tune providing additional downgradient <br />monitoring from the tailings facility and the collection pond. <br />' Detailed lithologic logs will be obtained from each of these boreholes and will be used to the <br />extent possible to correlate to other existing data from boreholes drilled in the vicinity of the <br />tailings facility and collection pond. Existing geophysical logs will be evaluated to assess <br />' whether similar geophysical log suites in these wells could help correlate data between <br />boreholes. However, the nature of the Santa Fe Formation is such that correlation between <br />boreholes may be very difficult due to the conglomeritic nature of the deposits. No marker beds <br />have been identified in the drilling done to date in the Santa Fe Formation. <br />1 <br />Once the monitoring wells are installed, pump tests will be conducted in each of tlhe wells, with <br />' the other monitoring wells used as observation points. The pump test data derived will be used <br />to model the ability of these wells to create a hydraulic barrier downgradient from the tailings <br />facility and collection pond, should remediation become necessary in the future. <br />' During each pump test, time-dependent water quality samples will be obtained from the <br />' discharge and will be submitted to an analytical laboratory for analysis of total cyanide <br />concentration. These samples will be collected, handled and delivered to the laboratory <br />' according to the QA/QC protocols (Halepaska and Associates, Inc., April 1992), <br />' The Theis non-equilibrium equation for unsteady radial flow to a well will be us@d to evaluate <br />whether the installed wells can control the ground water gradient downgradient pf the tailings <br />' -3- <br />tJ <br />