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Doc Date:12/11/2001 II I I II I II I II IIII III <br />sss <br /> <br />United States Department of the Interior <br />OFFICE OF SURFACE MINING <br />RECLAMATION AND ENFORCEMENT <br />BROOKS TOWERS <br />1020 l5TH STREET <br />DENVER. COLORADO 80202 <br />December 8, 1989 <br />t: <br />• <br /> <br />Ms. Barbara Sudler <br />State Historic Preservation Officer <br />1300 Broadway <br />Denver, Colorado 80203 <br />ATTENTION: Jim Green <br />RE: MT. Gunnison Mine #1- Modification <br />Dear Ms. Sudler: <br /> <br />In Reply Refer To: <br />-d <br />~ ~ ~ <br />ARCO Coal Company is planning to modify its Mt. Gunnison #1 <br />underground mining plan to include the extraction of a lower, <br />second, seam of coal (B Seam). This coal will be taken from a <br />portion of their approved Mt. Gunnison #1 permit area. In <br />addition, they wish to add 36 acres to the permit area to allow <br />underground entry to the B seam. <br />~. <br />J <br />No surface modifications are planned for the additional 36 acres <br />(located in sections 29 and 30 T135, R90W as shown on enclosed <br />map) nor in connection with the mining of the B seam. The second <br />seam (B seam) mining plan is to utilize longwall mining <br />techniques while the approved upper F seam mining will continue <br />to use room and pillar methods. The lower seam mine area lies at <br />least 400 feet below the upper seam mine area, which in turn lies <br />at least 400 feet below the surface. Subsidence effects are <br />expected to be minimal for most of the permit area. The area most <br />likely to experience maximum subsidence is located in the E1/2 <br />and E1/2 of the W1/2 oP section 20, T13S, R90W, where both the <br />seams will be mined. Subsidence in this area may be up to 10 <br />feet, though less is expected. <br />The Mt. Guar-ison Mine #1 permit area has received your attention <br />several ti a in the past, as evidenced by your letters dated <br />June 1 anly 11, 1977. These indicate that the SHPO and the <br />State Archaeologist were satisfied with the archaeological <br />reconnaissance survey of 460 acres conducted for the area by <br />Applegrath and Hurlbert. Neither of the two historic occupation <br />sites recorded by the aurvey (5 GN 036 and 5 GN 037) will be <br />impacted (even by subsidence) by the project. In August, 1982 an <br />additional 30 acres of land potentially disturbed by drilling and <br />road construction were intensively surveyed by the Grand River <br />Institute. The inventory located no cultural resources (report <br />enclosed). In August, 1985 we received a "no effect" <br />determination from your office for a 320 acre expansion of <br />