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iii iiiiiiiiniu iii <br />u~oi umw nynway io <br />Meeker, Colorado 81647 <br />(970241570 <br />(970)8244459 FAX <br />Richard G. Atkinson <br />FiSE(] end Land Manager <br />Ms. Erica Crosby <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver CO 80203 <br />RE: SEDIMENT POND REVIEW <br />Dcar Ms. Crosby: <br />June 10, 1996 <br />4~~~~~ED <br />.IIaN .l ~ <br />1996 <br />OIVl51t~r~ Ur 'Orel ~p <br />cry R ~tuipg„ <br />The following letter is provided to outline Colowyo Coal Company L.P.'s (Colo~~yo) plans to evaluate the <br />existing sediment ponds at the Colotryo Mine. It appears that following meetings with the Colorado Division of <br />Minerals and Geology (DMG) and the Colorado Water Quality Control Division (WQCD) the only way [hat Colo~v}-o <br />can be assured that it can continue to qualify for the Alternate Limitations included in CDPS No. COG-850017 for <br />discharges associated with inflow from precipitation or snowmelt will be to redesign most of the ponds as treatment <br />ponds <br />We plan to use SEDCAD to model the pond outflows. For the ponds that havc cxrs[ing SEDCAD inflow <br />models (East Taylor, West Pit, Sectron 16, and Prospect), we plan to only prepare new models for the outflows under <br />a treatment scenario. For the remaining ponds (Streeter, Gulch A, Gossard Loop and Gossard), we will develop <br />SEDCAD inflow and outflow models as treatment ponds. We currently plan to continue the Work Area and the Stoker <br />ponds as contain ponds, and a plan of operation will be developed. <br />We will prepare a Technical Revision to Permit No. CO-81-019 to submit the revised designs. We do not <br />intend that this revision start from ground zero, since all of these ponds are already constructed, and most havc many <br />years of historic use and compliance. This effort is primarily to simplify regulatory compliance and clarify with DMG <br />and WQCD the operation of Colort~ o's sedimentation ponds. <br />Our goal is to have the Tccluric~J Revision submitted and approved by September, so that we can complete any <br />required on-thegound modiScations by the end of the 1996 5eld season. After we have completed the discharge model <br />for one of the ponds, we will meet with the DMG to review the model prior to modeling the remaining ponds. <br />Sincerely, <br />R. G. Atkinson <br />cc: Robert Shuckle, WQCD <br />J.A. Kiger <br />K.A. Wolf <br /> <br />