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Battle Mountain Resources <br />January 25, 2000 <br />Page 2 <br />Table 1 Timing of Water Managemeut Implemeutatiou <br />GROUNDWATER LEVELS <br />West Pit <br />Groundwater pumps were installed in three West Pit backfill wells (BF-3, BF-4, anJ BF-5) and the <br />pumps were operated periodically until December 1999. The backfill wells have been pumped <br />continuously since January 1, 2000. Water levels in the monitoring wells installed in the backfill of <br />the West Pit and the Pink Gneiss Pit (BF-series), and the one monitoring well installed in the <br />Precambrian bedrock (PC-2), aze shown in Figure 2. The overall response of the hydrologic system <br />of the backfill has been a decline in the groundwater level by approximately 6.5 feel since initiation <br />of activities associated with implementation of [he water management plan in the vicinity of the <br />West Pit. The water level in monitoring well PC-2 generally mirrors the water level decline <br />observed in the backfill wells, which lends support to the conceptual hydrologic model presented in <br />TR-26. Monitoring well PC-2 is completed in a block of fractured Precambrian bedrock that <br />connects the West Pit and the Pink Gneiss Pit. Thus, the groundwater in the Precambrian bedrock <br />aquifer is in communication with groundwater in the backfill but the chazacteristics of groundwater <br />flow differ between these two geologic materials because of the differences in hydraulic properties <br />(as discussed in detail in TR-26). <br />Rito Seco Alluvial Aquifer <br />The main focus of groundwater pumping has been from the groundwater wells (hereafter referred to <br />as "curtain wells") located within [he azea of flow from the West Pit into the adjacent Rito Seco <br />alluvial aquifer. These curtain wells include M-18, M-19, M-20, M-28, and M-29 (Figure 1). All <br />of the curtain wells but M-20 were brought on line in July 1999, and M-20 began pumping in <br />September 1999. <br />The measured trends in groundwater levels in the curtain wells and in two immediately <br />downgradient monitoring wells (M-21 and M-22; Figure 1) are shown in Figure 3. Water levels in <br />3801 Au[on:ation Way, Suite 100, Fort Collins, Colorado 80525 <br />Telephone (970)123-9600 /FAX (970) 223-7171 <br />