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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />28 September 2010 <br /> <br />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Mr. Gus Gaviotis Mike King <br />Executive Director <br />,otter Corporation '? <br />7800 E. Dorado Pl., Ste. 210 Loretta E. Pineda <br />Englewood, CO 80111 Director <br />Re: Schwartzwalder Mine, Permit No. M-1977-300, Adequacy Review for Technical Revision TR-14 <br />Dear Mr. Gaviotis: <br />The Division of Reclamation, Mining, & Safety has reviewed Technical Revision Request TR-14 and <br />identified the following issues that must be addressed before we can approve the TR: <br />Paragraph 2. This section appears to be emphasizing "immediate" impacts versus long term. Does Cotter <br />have a different approach for evaluating sources of contamination that might cause long-term impacts versus <br />short-term? <br />Paragraph 3. Please provide the expected approximate dimensions of the trenches. What will be the <br />expected number and sampling density/spacing of the soil profile samples? <br />Paragraph 4. For QA/QC, Cotter should collect a split periodically (one in ten or thereabouts) for analysis at <br />an independent laboratory. Will the XRF analyses be done at a laboratory or on site using a hand-held unit? <br />Paragraph 5. EPA Method 1311 is acceptable for this type of analysis, but EPA method 1312, the synthetic <br />precipitation leaching procedure, is more appropriate for mining-derived material. <br />Be advised that the decision date for consideration of this TR is 20 October 2010, and the adequacy issues <br />described above must be addressed by that date, or an extension must be requested by the Operator. Feel <br />free to call me at 303-866-3567 x8108 with questions. <br />Sincerely, <br />cz? Aa <br />David Bird <br />Reclamation Specialist <br />cc: John Hamrick - Cotter <br />Randy Whicker - Cotter <br />Tony Waldron - DRMS <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines