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Hyd~olagic Characterization <br />• Groundwater <br />- Installed 28 monitoring wells as part of the Response Plan <br />• Two wells in the Precambrian bedrock <br />• Four monitoring wells in the Santa Fe Formation <br />• Sixteen monitoring wells in the Rito Seco alluvium <br />• Five monitoring wells in the West Pit backfill and one well in the East Pit <br />backfill. <br />- Best available water level information indicates that a hydraulic gradient <br />exists from the backfill to the adjacent alluvium. <br />- Given the differences in aquifer hydraulic properties, groundwater <br />preferentially flows from the backfill to the alluvium, which occurs within <br />a fairly restricted zone on the southeast side of the West Pit. <br />- Alluvial aquifer flows into the backfill on the east side of the West Pit <br />- Best estimate of i'iow through the window from the West Pit is <br />approximately 80 gallons per minute. <br />