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Ms. Stephanie Fancher <br /> October 30, 2015 <br /> Page 5 <br /> three monitoring wells have been summarized and provided in Table 2 at the end of this <br /> Groundwater Level Monitoring Plan. <br /> The recorded data so far indicates a variation in water levels throughout the year that is not a <br /> result of mining activities. The data indicate fluctuations in water levels resulting from natural <br /> hydrology including precipitation events and changes that probably result from land uses <br /> including irrigation and irrigation return flows. This level of fluctuation is likely to continue in <br /> the future regardless of mining operations. <br /> Groundwater Level Monitoring Schedule <br /> As mentioned above, LRM has already installed three monitoring wells and monthly <br /> measurements are already being taken. LRM has committed to collect the groundwater <br /> monitoring data monthly for the first 12 months and quarterly thereafter during the duration of <br /> mining at Pit 21. <br /> Proposed Trigger Levels and Corrective Actions <br /> As indicated above, we do not believe that injurious water level changes will impact any existing <br /> structures or neighboring lands, and specific triggers are not necessary to protect those structures. <br /> Given the proximity of the monitoring wells to Pit 21 and the limited pre-mining saturated <br /> thickness in the wells, we expect that the monitoring wells may experience significant <br /> drawdowns during the dewatering phase of the mining operation, but we do not believe that the <br /> water level drawdowns in these wells will be indicative of injurious impacts to neighboring <br /> wells. Nevertheless, the monitoring wells will quantify water level changes adjacent to Pit 21, <br /> which will help to define how the aquifer system responds to the dewatering activities and clay <br /> liner installation. <br /> If you have any questions or comments, please do not hesitate to call. We are available to <br /> support the implementation of these monitoring points and the monitoring program, if needed. <br /> Very truly yours, <br /> BISHOP-BROGDEN ASSOCIATES, INC. <br /> Jennifer S. Lindahl, P.E. Christopher J. Sanchez, P.G. <br /> Senior Water Resource Engineer Principal <br /> JSL/CJS/jeb <br /> Enclosures <br /> 9641.12 <br />