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iii iiiiiiiiniii iii <br />C c~~us <br />~ Yampa Valley <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879800 <br />Kent Gorham <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />August 10, 1993 <br />Dear Mr. Gorham; <br />As discussed, please find the referenced plan outline below which <br />has been modified from our previous submittal to reflect the course <br />of action which CYCC wishes to pursue. As discussed, CYCC had <br />proposed the use of the existing sluice-gate to maintain the pond <br />level at a point which allows for the treatment and conveyance of <br />the 10 year-24 hour storm event. The existing flume installation <br />would be utilized in tracking flows per the current NPDES permit, <br />and the approved NPDES compliance sampling point would not require <br />modification. <br />Upon further review and discussion of the situation, CYCC wishes to <br />modify this plan as discussed, to reflect the use of the sluice- <br />gate to further dewater Pond A Dewatering would occur to a point <br />which will allow the removal of the two remaining plugs in the <br />third row of riser orifices along with maintenance of the two <br />orifices currently unplugged. This should then render the use of <br />the sluice-gate unnecessary for maintenance of the 10 yr -24 hour <br />water level. The dewatering activity associated with the sluicegate <br />will be co-ordinated with normal sampling to allow for represent- <br />ative water quality data to be obtained. Once the plugs have been <br />removed, CYCC will close the sluice-gate and will not utilize the <br />gate in the future unless required. Removal of additional riser <br />orifice plugs should address the issues associated with the <br />referenced NOV. Implementation of this revised plan will commence <br />within the timeframes stipulated by the referenced NOV. <br />Should you have any questions or <br />your convenience. <br />Sincerely, <br />~~~!~ <br />arcus A. Mi d eton <br />Environmental Specialist <br />comments, please contact me at <br />