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III IIIIIIIIIIIII III <br />ECG NECi4 <br />S Coal Company Seneca Coal Company <br />May 26, 1998 <br />RECEIVr~ <br />Ms. Erica Crosby <br />Division of Minerals and Geoloqy MAY 2 $ 1Q~A <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203-2273 Divisi0n01MinCCdls,.--- _. <br />RE: Seaeca ii-W Mine Permit C-62-057, Stipulation 27 <br />Dear Ms. Crosby: <br />Stipulation No. 27 was attached to the Seneca II-W Mine Permit C- <br />82-057 upon the approval of Technical Revision No. 29 on March <br />13, 1998. This stipulation stated that Seneca Coal Company shall <br />conduct a sediment level survey for Pond 006 and provide the <br />Division with a sediment pond cleaning plan to ensure proper <br />capacity for Pond 006 by June 1, 1998. <br />Seneca conducted the sediment level survey on May Bth and the <br />results of this survey are shown on the enclosed Exhibit 1. The <br />individual survey points are depicted in red with the <br />corresponding elevation. Revised contour lines were also <br />generated based on these results. The sediment volume generated <br />as of this survey date totals 3.4 acre-feet. Also, attached is a <br />copy of the Pond 006 Phase IV Summary Sheet from Attachment 13-4C <br />of the permit. The design has a sediment storage volume of 8.7 <br />acre-feet at an elevation of 7070.0. Therefore, 39.1Vs of the <br />available sediment storage has been utilized. Based on these <br />results, Seneca is not required to clean the pond out at this <br />time. We further believe that with the addition of the pre- <br />settling basin at the bottom of the 'B' Pit, sediment delivery to <br />Pond 006 in the next year will be at a minimum. Seneca will <br />continue to monitor the sediment level in the pond in 1999. <br />Should you or any other members of the Division have any <br />questions concerning the enclosed materials, please do not <br />hesitate to contact me. <br />Sincerely, <br />Michael G. Altavilla, P.E. <br />Engineering Manager <br />Enclosure(s) <br />c: Gary Wendt (PWCC) <br />Seneca Coal Company • P.O. Drawer D • Hayden, Colorado 81639 <br />Telephone (970) 276-3707 • FAX (970) 276-3014 <br />