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<br /> <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcpanmcnl ui Natural Rcwurces <br />I } 13 Sherman 51., Room ? I S <br />Denver, C'nlorarb 80'_OJ <br />Pho ne: 1 11171 8h6- 3 567 <br />FAt. 13oA 8J?-8106 <br />October 20, 1998 <br />Mr. Michael R. Neumann <br />Project Manager <br />Montgomery Watson Americas, Inc. <br />P.O. Box 774018 <br />Steamboat Springs, CO 80477 <br />Re: Hayden Gulch Mine (Permit No. C-80-003) <br />Phase II/Phase III Bond Release Application SL-03 <br />Dear Mr. Neumann: <br />DEPARTMEM OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5 Lochhead <br />Esecuuve Dueclor <br />Michael B. Long <br />Division Drteclor <br />The Division has reviewed the above-referenced application and has the following comments. <br />1. H-G Mine's recent degradation of Hayden Gulch surface water <br />a) Pre-mining TDS concentration in Hayden Gulch stream water was measured in four samples <br />taken at surface water monitoring site S-3 (see following table). The samples were taken on four <br />days in 1977 and 1978. The last sample in 1978 preceded the first ground disturbance by <br />mining at Hayden Gulch. <br />Sample Date <br />Pre-mining site S-3 <br />(0.6 mi. downstream <br />from LHG) <br />5/15/77 <br />4/8/78 <br />4/23/78 <br />5/19178 <br />Pre-mining mean <br />Post-mining site LHG 4/16/96 <br />5/13/96 <br />10/25/96 <br />10/28/96 <br />11/1/96 <br />x/13/97 <br />10/16/97 <br />Post-mining mean <br />TDS (me/Il <br />1140 <br />1097 <br />914 <br />940 <br />1023 <br />1090 <br />1840 <br />2480 <br />2380 <br />2360 <br />1440 <br />1970 <br />1937 <br /> <br />