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ii i i iii ii i_ii iiii iii <br />Doc Date:12/11/2001 <br />• SIG 2.04.5 GENERAL DESCRIPTION OF HYDROLOGY AND GEOLOGY <br />This permit revision application provides detailed information on the <br />hydrologic and geologic environment and resources potentially affected by <br />the Southfield operations. Information coverage includes the "General <br />Area", "Adjacent Areas", "Permit Areas", and "Mine Plan Areas", as defined <br />by Rule 1.04, for both the Southfield mine and loadout. <br />For the mine area, the "General Area" includes the Newlin Creek drainage <br />basin and Hardscrabble Greek to it's junction with the Arkansas River. <br />For the loadout area, the "General Area" includes the Oak and Chandler <br />Creek drainage basins to the confluence of these streams with the Arkansas <br />River. The "General Area" is sufficiently large to allow accurate <br />assessment of hydrologic impacts yet sufficiently limited to minimize <br />consideration of unrelated activities and potential impacts. The "General <br />Area" encompasses "Adjacent", "Permit", and "Mine Plan" areas. With <br />• respect to both hydrology and geology, the designated areas are shown on <br />the Regional Hydrogeologic Map, (Map 5). In addition, detailed <br />discussions of geology and hydrology are presented in Sections 2.04.6, <br />Geology Description, and 2.04.7, Hydrology Description. <br />The information presented in this permit revision application is based <br />upon available geologic mapping and reports, exploration drilling, sample <br />analyses, hydrologic monitoring results, field investigations, and <br />hydrologic modeling. Given the limited information available on surface <br />water resources, Dorchester and subsequently EFCI have utilized modeling <br />information developed by Simons, Li & Associates for the GEC Mine to <br />estimate surface flows for the Magpie and Newlin Creek drainages. This <br />information is presented in Exhibit 7, Hydrologic Information. Ongoing <br />monitoring activities have provided additional information on both surface <br />and groundwater environments. As appropriate to characterization of <br />baseline conditions, the additional monitoring information is reflected <br />in updated and revised discussions of hydrologic systems. <br />s <br />2.04.5-1 <br />