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Historically, field sampling of well M -14 has been difficult because parameter stabilization could <br />not be readily achieved utilizing the standard high -flow sampling procedures in place at the time. <br />In many instances, this resulted in excessive volumes of water being purged from the well prior to <br />sample collection and in some instances resulted in the well being pumped to dryness. Several <br />years ago, the dedicated pump that was initially installed in well M -14 was removed due to re- <br />occurring scaling issues. The dedicated pump was not replaced and well M -14 has been sampled <br />with a portable pump since that time. Parameter stabilization issues continued with the portable <br />pump, resulting in significant variations in the purge volumes during sampling which have likely <br />contributed to the variability of the TDS concentrations at well M -14. . <br />Field parameters collected during low -flow sampling in the Response Plan did not exhibit the same <br />instability shown in previous sampling events and stabilized fairly quickly. The ratio of laboratory <br />TDS concentrations to field specific conductivity (see Table 1 was consistent throughout the <br />Response Plan and correlated well to expected values. Samples collected were clear and did not <br />show the presence of bentonite or other suspended solids as supported by the low turbidity results <br />(see Table 1 . Slight increases in temperature during sampling are believed to be due to the low <br />volume of water pumped being insufficient to cool the pump. Water temperatures utilized in <br />calculations or modeling were from measured values prior to the pump temperature impacts as <br />they are believed to be more reflective of the aquifer conditions. <br />3.2 Water Level Measurements <br />As required under TR -32, water levels were measured on a monthly basis for wells M -6, M -7, M- <br />8, M -9, M -12, M -13R and M -14. Under the Response Plan, additional water level measurements <br />were taken at each sampling event at well M -14. All groundwater level measurements are provided <br />in Table 2. <br />Groundwater flow in the saturated Santa Fe Formation wells around well M -14 is generally to the <br />west. During Response Plan monitoring, water levels in M -9, M -12, M -13R, and M -14 have been <br />stable (see Table 2 and Figure 2). Figure 3 shows the depths to water over time for wells M -9, M- <br />12, M -13R, and M -14. <br />TR -32 M -14 TDS Response Plan Report , AES, Inc. <br />Battle Mountain Resources — San Luis, CO 4 January 2015 (Update) <br />