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Mr. Peter Hays <br />Ae: SerFer Pit, Adequacy Letter Response <br />August IS1 2008 <br />Page 2 of 6. <br />The applicant will. maintain a minimuin 100' setback f our the top.of the riverbank and <br />pox-bow. The "(Op.)."-notation has been removed frorn both exhibits C-2. and F. Exhibits, <br />V-2 and F are, included as attachments, to.this letter. <br />Rule 6.4,7:Exhibit G _ Water Information <br />4.1 The applicant states that the. entire.mine site,lies within the 100-year flood plain of the. <br />Cache la Poudre River..In the`event of a significant flood event (10- year. flood or. greater) <br />it is likely that the existing pit will :be captured by the Cache la'Poudre River. Wherever <br />mining will. occur within 400 :feet of the river channel, a -flood analysis and.flood control. <br />plan must be a aluated and` submitted.: This would .include pit side armoring, river site <br />_ armorigng; • inflow and outflow' channels, .or. ofher, appropriate measure: Accordingly,: the <br />Division requests that the applicant provide, the. flood"elevations(s) to be expected under a <br />"worst.case":flooding scenario,and specific. mitigation measures that will be;implemented <br />to minimize the potential for, any offsite impacts. ' <br />The applicant did not address the specific mitigation measure that will.be itnplemented,to <br />minimize the potential for any offsite .impacts including pit side. armoring, river site <br />armoring, inflow-andoutflow channels, oi: other appropriate measure iri the first adequacy <br />response letter date d July 9, 2008. Please address this question. or.submit a reason for not .. <br />responding to. the question. <br />A•. Floodplain Development Permit and Report was submitted to : the. Division of <br />Reclamation Mining and Safety.: The results of the :study. demonstrate that: the mining <br />process will not "negatively affect the floodplain.. <br />Specifc mitigation., measures were not identified based, on the results of the Floodplqin. <br />Development Permit and. Report: Mining,operations are a temporary eondition.and will <br />progress southward through, the'site. ' Mining operations on this site will be completed in <br />approximately four (4).years. AS 'a result; :mining operations within 400 feet of the river- <br />are riot expected to occur for d,.signifieant.period of time and do .not require specific <br />instigation- in.. easures. Ilowever, in the . unlikely event that flooding 'occurs in the short <br />amount of.time that mining operations will occur within 900 feet.of the. river channel, . <br />Connell Resources, Inc. will need to dewater the raining pit when -the flooding condition <br />subsides in order to continue. mining operations. . <br />In the unlikely. event of a flood resulting in damage to the IOp' setback front the top of the ' <br />riverbank Connell Resources, Inc. will commit to restoring. the 100' setback area to pre- <br />ood conditions.. .