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Requirement <br />Regulation <br />Reviewed <br />Comment <br />After mining is completed, Trapper's surface water will be <br />used in the former mine permit area for watering livestock <br />and wildlife. The suitability of Trapper's surface water for <br />those uses is evaluated by comparing the surface water data <br />supplied in the AHR to the water quality standards in <br />CWQCC Regulation 31 and Regulation 37 for stream <br />segment 3b. Regulation 37's classifications for stream <br />segment 3b include Aquatic Life (warm 2), Recreation (lb), <br />and Agriculture. The State of Colorado has defined the <br />Agriculture classification of water as suitable for irrigation as <br />well as stock watering. It is assumed that water that is safe <br />for livestock and aquatic life is also safe for wildlife. Also, <br />certain constituents monitored have effluent limitations <br />standards required from Trapper's NPDES permit. NPDES <br />monitoring results are also reviewed and discussed in section <br />E. and G. above. <br />Water quality was measured at the downstream discharge <br />points in drainages (near the permit boundary), and it is <br />assumed that water quality at these locations is also <br />representative of water quality at higher points in the <br />L. Prevention of <br />watersheds. It appears exceedances of the standards set forth <br />impacts to surface <br />CDRMS <br />in Regulation 31 and 37 did not occur in 2012. <br />water that <br />adversely impact <br />regulation <br />Comment <br />Section 5 of Trappers 2012 AHR discusses trends in major <br />the postmining <br />4.05.1(2) <br />constituents measured such as total suspended solids, <br />land use <br />conductivity and total dissolved solids. Trapper also <br />indicates very little change occurred in other constituents <br />with all minor constituents within their natural range. <br />Several elevated trends or data points are noted below: <br />• Elevated total dissolved solids (TDS), magnesium, <br />sodium and sulfate levels occurred at 001 discharge <br />point for Johnson Gulch. Elevated TDS levels are <br />consistent with the predictions of the probably <br />hydrologic consequences for Johnson Gulch discussed <br />in section 4.8 of Trapper's permit. <br />• Elevated HCO3, calcium, magnesium, sodium and <br />sulfate levels occurred at 011 discharge point for East <br />Pyeatt Gulch. <br />• Elevated sulfate levels were observed at 015 <br />discharge point for the Grouse drainage. <br />• Elevated HCO3 levels were observed at discharge <br />point 020 for the Middle Flume drainage. <br />• Elevated HCO3 and sodium levels were observed at <br />discharge point 021 for the E. Middle Flume <br />drainage. <br />M. Filing frequency <br />CDRMS <br />of pond reports <br />regulation <br />Yes <br />4.05.9(17) <br />Page 3 <br />