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<br />Based on limited drilling data, the Santa Fe Conglomerate <br />i does not appear to contain appreciable amounts of water <br />drainable by conventional dewatering wells, although it does <br />appear to be saturated in the vicinity of the Rito Seco. The <br />Santa Fe Conglomerate, composed of large cobbles in a primarily <br />' clay and silt matrix, exhibits very low hydraulic conductivity <br />and yields very little water to wells. Falling head <br />' permeability test results for permeability tests conducted in <br /> the Santa Fe Conglomerate and overlying alluvium are contained <br />' in Appendix E. <br />t A major structural feature in the western portion of the <br />t <br />i <br />f <br />l <br />l <br />h <br />t <br />di <br />h <br /> proper <br />y cons <br />sts o <br />a nort <br />ow-ang <br />wes <br />-tren <br />ng, <br />e t <br />rust <br /> fault, (approximately 13 degree dip). Along the trust fault, <br />' fault gouge, altered to green clay, is found. This clay layer <br /> is approximately 20- to 30-ft thick and acts as a confining <br />' unit over the West Pit area creating a confined aquifer of <br /> limited extent. Other structures that may influence the local <br /> hydrogeology are several north-south fault zones tnat transect <br />' the property in the West Pit. A map showing the sea structural <br /> features is presented as Figure G-9. Fault zones typically act <br />' as either conduits or barriers to flow. Based m the data <br /> currently available, the faults along the eastern side of the <br />' West Pit appear to be a barrier to flow. Water in the west <br /> ore zone flows to the south and to the west, with sdme <br />t discharge, via springs in tributaries of Rito Seco north and <br /> west of the West Pit area. The flow direction in the confined <br /> ore zone aquifer is estimated to be to the west, discharging <br /> into the alluvial plain west of the mine site, north of the <br /> Town of San Luis. <br />1 <br /> G.3.2 Hvdrogeoloav <br />' <br /> To evaluate the local hydrogeology, several drill holes <br />' were converted to observation wells, monitoring the aquifer <br /> beneath the green clay zone. In the East Pit area, the green <br /> <br /> G-29 <br /> <br />