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COLORAD~DISCHARGE PERMIT SYSTL7N (CDPS) <br />RATIONALE -AMENDMENT NO. 4 <br />SOMERSET MINING COMPANY <br />SOMERSET M/NE AND SANBORN M/NE <br />CDPS PERMIT NUMBER CO-0000132, GUNNISON AND DELTA COU/1'TIES <br />/. TYPE OF PERMIT Amendment <br />!/. FAC/L/TY INFORMAT/ON <br />A. Facility 7~pe: Coal Mining -Mine Water &/or Preparation Plant <br />Fee Category: Category 02, Subcategory 2 <br />Annual Fee: $612/year per CRS 25-8-502 <br />B. Legal Contact: Walter L. Wright, Mine Mnnnger <br />P.O. Bax 535 <br />Highway 133 <br />Somerset, CO 81434 <br />(303J + 929-5122 <br />C. Facility Coruaetr Bill Pechnrich, Operations Manager <br />(303) + 929-5122 <br />D. Facility Location: In sec. 3, 4, 5, 6, 7, 8, 9, J0, ll and l7, T13S, R90W,~ and in sec. 1. 2, <br />3, ll, 12 and l3, T/3S, R9/W; nor/ in sec. 34, 35 and 36, T12S, R9/W; <br />and in sec. 31, T12S, RSI~W; nrnr Somerset, CO. <br />/!/. PURPOSE OF AMENDMENT <br />In a leaer dated February 1, /995, the permittee requested several chnngec to their permit. <br />• The permittee requested some form of reliejfrom WET testing for crriorlanltnia sp, jot outfnll 011. The <br />Divirion evaluated the request and offered five options for resolution. The pernurree performed further <br />evaluation and determined that groundwater flow into the mine elevated [eveic of alknliniry~, causing TDS level.. <br />to elevate also. To deal with thrs, they selected the Division's option whereby they would modem their WET <br />testing protocol to remove only TDS prior to testing. This has been accony~lished by lowering the test water <br />alkaliniry~ level through titration of the sample with su~ric acid. Page /jgjthc permit will be mrxliFed to <br />allow for this test procedure nwd~cation. <br />• They requested that the monitoring frequencies for all parameters escept WET jar outjall 011 be relaxed to <br />monthly. this is not appropriate due to the source (mine waterJ, which should be monitored on a[ lead a <br />weekly basis far proper operation to detect any potential changes in quality. However, ft is appropriate to <br />reduce the frequenn~ for total suspended solids oral total iron to nwnthly. The justification for this reduction <br />is thn[ the qualin~ has remained well below the ejJluent limitations. <br />