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rte' <br />z <br />t~~~ <br />December 19, 2007 <br />826 21 Y2 Road <br />Grand Junction, CO 81505 <br />T: 970.263.7800 <br />F: 970.263.7456 <br />R <br />DEC 2 0 2007 <br />101 S. 3 Street, Suite 301 GRAND JUNCTION FIELD OFFICE <br />Grand Junction, CO 81501 pINISION OF <br />RECLAMATION MINING & SAFETY <br />Re: Response to 2nd Adequacy Review, Circle Dot Quarry, 110 C Application No. M-2007- <br />067 (Letter from T. Marshall to B. Danforth, dated December 14, 2007 <br />Division of Reclamation, Mining and Safety <br />Grand Junction Field Office <br />Attention: Travis Marshall <br />rd <br />Dear Mr. Marshall <br />In response to the above-reference letter, the issues identified in that letter are addressed <br />below: <br />1. Any overburden excavated, in excess of the topsoil that will be stockpiled on <br />location, will be removed and utilized off site for other construction purposes. <br />2. The depth indicated in your letter appears to be based on the elevations indicated on <br />the mining plan near the southwest edge of the proposed location. The pre- <br />disturbance elevation near the center of the proposed location is 20-25 feet higher <br />than that at the southwest edge of the location, therefore, the thickness of the <br />deposit to be mined is dependent upon the natural grade of the location and will vary <br />from approximately 14 feet to 60 feet depending upon the location being mined. <br />3. The stockpile and loading area located in the southeast corner of the site will be <br />excavated and that material will be used to establish the final slopes. <br />4. Mining will begin on the north end of the mine and move toward the south. In <br />accordance with the Stormwater Management Plan and permit for this location, a <br />combination of best management practices (BMPs), including diversion ditches and <br />sediment-retention ponds, will be used to control sediment. <br />5. A berm will be constructed at the base of the topsoil stockpile along the northwest <br />edge of the site to protect the stockpile. <br /> <br />If you have any questions or require additional information, please contact me at 970-263-7800. <br />Sincerely, <br />o Dennison <br />Associate Geologist <br />cc: Amy Stoodt, Marathon Oil Company <br />Cordilleran Compliance Services, Inc. <br />Grand Junction, CO • Denver, CO <br />Environmental Consulting Engineers and Scientists <br />