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Brian Watterson <br />Page 2 <br />06/09/05 <br />NDPES Outfalls <br />All NDPES outfalls are monitored at a frequency that is the same as the active mining <br />monitoring plan (pages 1-14 of Exhibit 29). <br />[copy of the current CDPS permit CO-0034142] Response accepted. <br />[explain the statement "no discharge from the sediment ponds." Response <br />accepted. <br />Surface Water Monitoring <br />Two surface water sites, WF-1 and WF-2, are monitored along the Williams Fork River. <br />During temporary cessation, the monthly and/or quarterly requirements are reduced to <br />one annual visit to each station. <br />8. [lab sample sheets for WF-1 and WF-2] Figure 8, although it states it is a graph <br />of total dissolved solids, it appears that it is a graph of conductivity. Please <br />correct Figure 8 and re-submit. <br />The mine appears to have no impact to water quality in the Williams Fork River. <br />Dissolved solids below the mine (240 mg/I) are less than above the mine operation (250 <br />mgll). <br />Water Quality Samaiina <br />NDPES Outfalls <br />9. - [DMR deviations] Response accepted. <br />Groundwater/Mine Water Monitoring <br />10. [datum for TR-7A] Response accepted. <br />This concludes the Divisions review of the responses to our review of the 2004 Annual <br />Hydrology Report for the Eagle Mine Complex. Please respond to the remaining issues <br />within 15 days of receipt of this letter. Thank you for your diligence in completing your <br />monitoring program in accordance with the approved plan. <br />Sincer y, <br />Ke orham <br />Environmental Protection Specialist II <br />