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• Plan - East Portal and Map 14, Sediment and Surface Water Control Plan - <br />West Portal. These diversion and sediment control structures collect <br />all water from the disturbed areas of the surface facilities and are <br />sized properly to ensure that they continue to work under adverse weather <br />conditions. This system currently is in use at the New Elk Mine and is <br />functional. The treatment of the water which is discharged is based on <br />the NPDES permit limitations (Exhibit 22, NPDES Permit). The quality of <br />the water associated with the surface water regime at the New Elk Mine <br />area is described in Exhibit 8, and updated yearly in the Annual <br />Hydrology Reports. <br />Impacts of Secondary or Retreat Mining on Alluvial Valley Floors. <br />WFC conducted secondary or retreat mining at the mines. The following <br />assessment discusses potential impacts on Apache and Ciruela Canyons <br />within the 5-year permit term in response to Stipulations 11, 14 and 17. <br />Apache Canyon is south of the New Elk Mine and west of the Golden <br />Eagle Mine. It drains an area of 7,566 acres which is covered primarily <br />• by woodland. Grazing and wildlife are the primary land uses within the <br />canyon. Mining is also a minor land use with two ventilation shafts and <br />a power substation located in the lower canyon. Basin believes it is <br />necessary to maintain the land uses of wildlife habitat and grazing in <br />Apache Canyon after mining is completed. Basin would take appropriate <br />mitigative measures if mining seriously impacted the potential for their <br />use. It is highly unlikely surface flows would be impacted. It is more <br />likely windmills could be rendered unusable. Basin could, in the latter <br />case, drill new wells for stock water or build additional impoundments <br />for stock water. It is not possible to predict at this time. However, <br />Hasin has this property under lease and it is Basin's current <br />responsibility to ensure water is available for livestock watering and <br />distribution. <br />Surface water resources have been quantified through monitoring <br />studies. The results of these studies indicate that both Apache and <br />Ciruela Canyons are ephemeral streams. These canyons flow in response <br />to significant storm events. Flows in these canyons have been shown to <br /> <br />(Revised OS/11r94) <br />2.05-61 <br />