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~ III IIIIIIIIIIIIIIII STATE OF COLORADO qiC H%.RD D. LAAVd. Gov crn rv DEPARTMENT OF NATURAL RESOURCES D. Monte Pascoe, EHecutive Director MINED LAND RECLAMATION 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 David C. Shelton Director T0: Sandy Emrich FROM: Jerry Zimpfer RE: Foidel Creek Underground Mine, Preliminary AVF Determination and Preliminary Adequacy Review DATE: November 15, 1982 I have reviewed the alluvial valley floor sections of the Foidel Creek underground mine permit applications, and the Eckman Park permit application. The information provided is sufficient to complete the. required alluvial valley floor determinations for portions of Fish Creek and Foidel Creek. In order to speed up the review process for this mine, I have proceeded to make preliminary AVF determinations at this time rather than waiting until the Division writes a draft findings document. These preliminary determinations will be expanded and formalized at a later time. If the applicant chooses to provide additional information, addressing these areas covered by the assumptions, the alluvial valley floor determination could be refined. Map 9 of the Foidel Creek Mine permit application and P1ap 6 of the Eckman Park Mine permit application identify unconsolidated streamlaid deposits in and adjacent to the proposed permit area. Areas shown on Map 6 that lie along Middle Creek or on Foidel Creek upstream of the proposed mining operation would not be affected and need not be considered further. Areas of unconsolidated streamlaid deposits along Foidel Creek and Fish Creek that are located adjacent to the proposed mining operation and downstream from the mining operation could potentially be affected by the mining operation. Alluvial valley floor determinations and the appropriate findings will be made for these areas. Fish Creek Map 6 of the Eckman Park permit application shows unconsolidated streamlaid deposits located along Fish Creek beginning several miles upstream of the proposed mining operation down to the confluence with Trout Creek. The permit application concedes that Fish Creek has been determined to be an alluvial valley floor based upon the capability for subirrigated agricultural activities. The applicant has not identified any historic or existing flood irrigated areas along Fish Creek. Records of the State Engineer's Office show several existing stream diversions located on Fish Creek both