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Gold Hill Mines, Inc. <br />P.O. Box 1523 <br />Longmont, Colorado 80502 <br />(303) 651 -2985 <br />September 27, 2013 <br />Colorado Division of Reclamation, Mining and Safety <br />/ Mr. Michael A. Cunningham <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RECEIVED <br />s'P 2 7 2011 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />Gold Hill Mill, Permit No. M- 1994 -117 <br />Re: Technical Revision No. 9; Water Monitoring Locations and Sample Parameters <br />Dear Mr. Cunningham, <br />Since we last communicated, Gold Hill Mines, Inc. has completed assembling and <br />reviewing the analytical results from water sampling at the Gold Hill Mill. We are <br />submitting these results in support of our request to revise the water quality monitoring <br />requirements for this permit. <br />Spreadsheets are attached to this letter showing the analytical results from years of <br />water sampling at the Gold Hill Mill. We believe the analytical data supports our request <br />to eliminate the following elements that Gold Hill Mines is currently required to have <br />analyzed at each water monitoring location: Aluminum, Arsenic, Cadmium, Chromium, <br />Cobalt, Copper, Iron, Lead, Lithium, Mercury, Nickel, Selenium, and Vanadium. As you <br />can see, these elements have been either below the MDL or below the EPA's MCL <br />standards. Eliminating these elements will leave Gold Hill Mines with the requirement to <br />obtain quarterly analytical results for Manganese, Zinc, and Sulfate. <br />In addition, a review of the results from years of water sampling from monitoring wells <br />one and two (W1 and W2) does not show any significant increase in any elements that <br />would justify the need to continue sampling these two monitoring wells. Nothing in the <br />results obtained to date indicates that any mill process water has ever migrated to these <br />two monitoring wells. They are both located hundreds of feet to the southwest of the <br />lower edge of the mill tailings pond, and there is no geological evidence that these two <br />wells would intercept any water that might actually migrate from the tailings pond. If any <br />process water did migrate from the lined tailings pond, it would be detected in the two <br />monitoring wells (W3 and W4) that are located directly below the tailings pond <br />