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.. ~.~ <br />f <br />C c~RUs <br />~ Yampa Valley <br />iiiiiiiiiiiiiiiiiii <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />June 3, 1993 <br />RFrE~VEG <br />Ms. Pat Nelson JUN 7 1993 <br />Colorado Department of Health <br />Water quality Control Division <br />Attention: Permits and Enforcement pivisiCnCSA4iner"''"e~luyY <br />4300 Cherry Creek Drive South <br />Denver, CO. 80222-1530 <br />Dear Ms. Nelson: <br />Re: Supplemental De-watering Activities, Outfall 001; NPDES Permit <br />CO-0027154, Cyprus Yampa Valley Coal Corp. <br />As discussed with Don Homer of your Department, CYVCC needs to <br />augment the discharge rate from outfall 001 for the refenced <br />permit. This increased discharge is necessitated by a violation <br />received from Division of Minerals and Geology, which requires us <br />to drop the water level on this pond by mid-month. <br />As discussed with Don, CYVCC proposes the use of a pump, which will <br />either be routed into the top of the riser, or will be run down the <br />face of the embankment to the discharge point, to accomplish the <br />necessary draw-down of the pond. In addition to the pump, CYVCC may <br />also utilize a limited number of siphon tubes over the embankment <br />to supplement the de-watering. These siphon tubes would also <br />discharge at the mouth of the discharge culvert. Due to the routing <br />of the supplemental discharge, CYVCC would need to temporarily move <br />downstream a short distance from the established compliance point <br />(at the end of the discharge culvert) to monitor all discharge <br />flow. <br />Weekly samples will be collected per our normal monitoring <br />requirements, and daily visual assessments are planned during the <br />supplemental de-watering process. CYVCC does not anticipate any <br />problems with meeting the applicable water quality standards during <br />this process. <br />