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2.05.6 Mitigation of the Impacts of Mining Operations <br />(a)(iii) The narratives above and in Section 2.04.7(3) discuss the impact the <br />mining operation could have on the quantity of surface and ground water <br />within the permit and adjacent area. Alternative sources of surface water <br />will be utilized, if required. The Applicant has a 150 cfs conditional water <br />right for industrial and domestic uses on the Colorado River near the <br />proposed loadout (Map Code 28), and two water rights near the loadout <br />facilities, one in Reed Wash (Map Code 33), and one in Loma Drain (Map <br />Code 34) totaling 3.25 cfs, conditional for industrial uses. Excess water <br />from these water rights can be used as an alternative water supply. The <br />Applicant recognizes it is required to replace the water supply of any <br />owner of a vested water right which is proximately injured as a result of <br />the mining activities in a manner consistent with applicable State law. <br />(a)(iv) Not applicable to the loadout operation. No underground mining will <br />occur. <br />(b)(i) A plan for control of surface and ground water drainage. <br />Applicant has prepared a drainage and sediment control system which will <br />minimize changes to the surface water and to the prevailing hydrologic <br />balance in the facilities area by detaining run -off in sediment pond(s), <br />treating runoff with silt fences, and a SAE for topsoil pile #2 as shown on <br />Map -16. Sediment ponds 1 -3 are designed to contain the run -off from the <br />25 year precipitation event. There are thirteen railroad silt fence designs <br />that are not required SAE designs, but are included in order to <br />demonstrate compliance with the stream buffer zone rule (SF- 8,9,10,11,12 <br />& 13). Silt fences SF 1 -7 are used to limit peak settable concentration in <br />the waters discharging to the non - jurisdictional wetland areas to limit the <br />disruptions to wetland -type vegetation hydrology. <br />Rule 4.05.9(2)(e) allows the DRMS to approve a temporary impoundment <br />that relies primarily on storage to control run -off from the design event <br />specified in 4.05.9(2)(e)(ii). Since the ponds 1 -3 are Class A dams, the <br />design event is the 25 year 24 hour precipitation event. As shown on Map <br />13 in Volume I, Exhibit 9, ponds 1 -3 have adequate capacity to contain the <br />25 year 24 hour precipitation event with freeboard. <br />Permit Application 2.05 -55 01112 <br />