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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1373 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303} 8664567 <br />FAX: (303) 832-8106 <br />DATE: July 29, 2003 <br />TO: Gregg Squire /~ <br />FROM: Allen Sorenson /~f <br />RE: Adequacy Review - Floodplain Impacts, Mountain Aggregates, <br />Empire Pit, Permit No. M-1977-534 <br />~~ <br />)LORADO <br />VISION O F <br />INERALS <br />EOI,OGY <br />LANATION•NINING <br />iAf ETY•SCIENCE <br />Bill Owens <br />Governor <br />Greg E. Walther <br />Executive DlreC[Or <br />Ronald W. Cattany <br />Division Director <br />Natual Resource Trustee <br />Amendment AM-Ol to the Empire Pit permit describes a levee that will be constructed along the right <br />bank of the West Fork of Cleaz Creek. The levee will prevent the probable maximum flood from <br />spilling into the proposed reservoir. The levee will also serve to raise water surface elevations and <br />increase the size of azeas inundated during extreme flooding through the Town of Empire and other <br />downstream property. If the areas south of the.proposed levee aze not in the jurisdictional floodpiain <br />(100-year floodplain), then construction of the proposed levee may proceed without having to address <br />the potential for increased downstream flooding that may be caused by the levee. If the areas south of <br />the proposed levee aze currently in the jurisdictional floodplain, then the Applicant should have an <br />approval from the local floodplain authority to construct the levee. The Division of Minerals and <br />Geology (DMG) does not want to duplicate the regulatory activities of other jurisdictions, but the <br />Applicant must provide DMG with a description of the how the floodplain issues relative to the <br />proposed levee and reservoir have been analyzed and addressed from both the technical and regulatory <br />standpoints. <br />cc: Cazl Mount, DMG (via email) <br />c:~acs~Ivly Documents~clnpire pit Oood memo.doc <br />Office of Office of ~ Colorado <br />Mined land Reclamation ~ Active and Inactive Mines Geological Surva <br />