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f' <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depart menl u( N,vural Resources _ _ _ _ _. _ -. <br />1313 Sherman 51 , Runm ? 15 <br />Dcnvcr, Colorado AO'O l <br />Phone. 0031 Hfi6- 5567 <br />FAX: IlOJI H f2~H 1116 <br />April 26, 1997 <br />Post-it® Fax Note 7671 Date ~ Z6 9 pages <br />70 / _ e., / /i From ~~ I ~Ci/L 6 f'~'«i <br />Co.IDept. Co. <br />Phone k Phone p <br />-7 <br />Fazri z~cj_77) ! ~ FaxB <br />~~~~~ <br />DEPARTMEM OF <br />NATURAL <br />RESOURCES <br />Rny Romer <br />Govenwr <br />Mr. Curtis Bernhardt IamesS i«hhead <br />Colino Oro Molino, Inc. F`"cuiveD1c~'°' <br />76 Beaver Street, Suite 500 m~~n.,ei e. r°nR <br />New York, NY 10005 °ivi~onD~~1°O~ <br />RE: Ground Water Monitoring, Gold Hill Mill, Permit No. M-94-117 <br />Dear Mr. Bernhardt: <br />The terms and conditions of the Gold Hill Mill reclamation permit <br />require that the four (4) ground water monitoring wells located down <br />gradient from the mill tailing pond be sampled and analyzed once per <br />calendar quarter, and that the results of the ground water analysis be <br />provided to the Division. The last set of ground water analyses that <br />have been received by the Division are from a sampling event that <br />occurred on March 16, 1996. Please provide the data from the second, <br />third, and fourth quarters of 1996, and the first quarter of 1997, no <br />later than May 15, 1997. Please also assure that the caps on the <br />monitoring wells remain locked at all times; this will be a topic for <br />the Division's next inspection of the Gold Hill Mill. <br />In reviewing the ground water monitoring data for the Gold Hill Mill <br />from past sampling events, the Division has found that the data is <br />inconsistent in terms of parameters analyzed and laboratory detection <br />limits employed. For the second quarter of 1997 sampling event, and <br />for all future sampling events, the Division will require that the <br />following table of parameters and detection limits be employed: <br />PARAMETER DETECTION LIMIT, u4/L <br />Aluminum 50 <br />Arsenic 1 <br />Cadmium 0.25 <br />Chromium{VI) 10 <br />Copper 5 <br />Iron 10 <br />Lead 5 <br />Manganese 4 <br />Mercury 0.2 <br />Selenium 1 <br />Silver 0.2 <br />Uranium 10 <br />Zinc 8 <br />