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0 -, <br />David Bird <br />Senior Geochemist <br />Division of R?cl rnati MMiui_ng & Safety <br />1313 Sherman Street, Rm 215 <br />Denver, CO 80203 <br />Tel: 303-866-3927 <br />Fax: 303-832-8106 <br />Nov 16 top <br />RECFIV <br />Division <br />Mino Of Reclamation <br />ing and Safety <br />November 13, 2007 <br />Subject: Schwartzwalder Technical Revision Application, Permit No M-77-300 <br />Dear Mr. Bird: <br /> <br />This is request for a Technical Revision (TR) to Cotter Corporation's Schwartzwalder <br />Reclamation Plan (File No. 77-700) in accordance with Rule 1.8.4. A check in the <br />amount of $173.00 is provided herewith in accordance with SB 07-185. The TR request <br />pertains to revision of one section of Appendices E-3 (Adit Closures) of the existing Plan. <br />The current reclamation plan provides for the hydrologic sealing of the Steve Level adits <br />using bulkheads constructed using sprayed gunite concrete. This TR request is to <br />upgrade the bulkhead seals from sprayed gunite concrete to a formed and pumped <br />concrete, with additional post-shrinkage grouting. Enclosed are preliminary drawings <br />and calculations for the upgraded bulkheads, which were presented previously at the <br />November 8th meeting. <br />Should you have any questions or comments regarding this request for a Technical <br />Revision or need additional information, please do not hesitate to contact me at 361-318- <br />1622 cell or 720-554-6205 office. <br />Respectfully, <br /> <br />Amy Thurlkill <br />EH&S Manager <br />Cotter Corporation <br />Enclosures (3) <br />AT <br />cc: DTC File <br />Cotter Corporation Telephone (720) 554-6200 <br />7800 E. Dorado Place, Suite 210, Greenwood Village, CO 80111 Fax (720) 554-6201