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3.2006 2:12PM <br /> <br /> <br />,.. <br /> <br />i~ <br />February 03, 2006 <br />AMERICAN GYPSUM <br />AMERICAN <br />GYPSUM <br />N0.092 P• <br />Permit #: N.~/9AS~-!,~ Confidental?: <br />Class: Type-Seq.:~7 - <br />From: To:Q <br />,Doc. Name: _ <br />Doc. Date (if no date stamp): "~ <br />Specialist: ~,,,~~,,,,~ <br />Mr. Carl Mount, Minerals Division R E C ~ 1 ~ ~~ ~ <br />Colorado Division of Minerals and Geology FEB 1 ~ 2006 <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Drvis~on of Minerals ano Geology <br />Y2e: American Gypsum Company, Permit M-1984-041 <br />'Technical Revision 07, Relocation of Sediment pond 5 <br />ovlof-0atoo.oz <br />TECHNICAL REVISION <br />Dear Mr, Mount: <br />' This Technical Revision is submitted to the Colorado Division of Minerals and Geology <br />(GONG) by the American Gypsum Company, (American Gypsum) for the American Gypsum <br />Mine located in Gypsum, Colorado, Eagle County. <br />Tn September of 2003, a new haul mad and associated sediment control structures accessing the <br />east pit were designed and approved (October 27, 2003) by the CDMG. American Gypsum has <br />proposed relocating one of the previously approved sediment dams, dam P5, approximately <br />'' 1,100 feet downstream from the original location. The approximate coordinates of the relocated <br />dam are N13,875 and E16,475. <br />The sediment dam must be capable of adequately handling runoff associated with the 100-year/ <br />24-hour storm event of 2.8 inches. The access tnaiatenance road wiII be routed to the site from <br />' existing sediment dam P4. Layout of the dam and spillway and design of appropriate dam <br />slopes, dam crest width, spillway geometry, and erosion protection will be consistent with <br />Colorado State Engineer guidelines. <br />' Summarization of the work is included in the attached design report, which contains the <br />construction drawings and technical specifications. The construction drawings include the <br />' following sheets; Cover Sheet, Project Layout Plan, Plan and Profile of the Access Maintenance <br />Road, Plan and Profile of the Relocated Sediment Dam, Typical Sediment Dam Sections and <br />Details, and Typical Access Road Sections and Details. <br />Yours tntly, <br />G~~ ~ , <br />'' Stephen A. Onorofskie <br />Mine Manager, American Gypsum Company <br />Attachment: Sediment Pond 5 Relocation Design Report <br />-i <br />' P. O. Box 980 • Gypsum, CO 81637 (970) SZ4-9700 FAX 1970) 524.8140 <br />