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i1 <br />(4) Obtain time-dependent water quality samples during each of the pump tests for <br />cyanide analysis; <br />1 <br />I' (5) Evaluate whether these wells can effectively provide remediation {n the event that <br />contaminants are observed in the local ground water table; and <br />' (6) Recommend the installation of additional wells if hydraulic control cannot be <br />' demonstrated by the wells currently in place. <br />' These tasks have been completed, and this report presents the results of Battle Mountain's <br />findings. The following sections describe the field investigations related to the installation of <br />' the two additional monitoring wells, the aquifer testing, the geophysical logging and the water <br />quality sampling during the pump tests. These data were then used to provide a hydrogeologic <br />' assessment in the vicinity of the tailings facility and collection pond. <br />~' FIELD INVESTIGATIONS <br />' As required in Technical Revision-08, Battle Mountain authorized the insta{lation of two <br />additional monitoring wells at the locations shown in Figure I. These wells were drilled, <br />' installed, logged, tested and sampled during the period ]uly 20 through 28, 1992. The following <br />sections describe the activities related to these investigations. <br />Installation of Monitoring Wells <br />1 <br />Layne Environmental Services, Inc. was contracted to drill the two new monitoring wells (M-12 <br />' and M-13) at the locations shown in Figure 1. Layne used an AP-1000 percussion hammer air <br />reverse rig with a 9-inch bit. Each of the boreholes was advanced using air as the drilling fluid <br />' and no liquid drilling Fluids were used in either well. <br />1 <br />' 2 <br /> <br />