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INTEROFFICE CORRESPONDANCE JUN 0 1986 <br /> r F ; <br /> Date: May 26, 1986 <br /> To: Doug Bowman <br /> From: Scott Jones <br /> Subject : Sedimentation Pond Inspection, May 1986 <br /> On May 6, 13 and 19, 1986, an inspection was made of all <br /> Mid-Continent Resources Coal Basin Sedimentation Ponds . The <br /> inspection was made by myself, a Registered Professional Engineer <br /> in the State of Colorado. I have had over five years experience <br /> in the design, construction, and maintenance of sedimentation <br /> ponds . <br /> The purpose of this inspection was to-ensure that all of <br /> the ponds were stable and hazard free and to satisfy the require- <br /> ments of Rules 4. 05 . 6( ii ) (c) and 4 . 05 . 9( 10) (b ) of the Colorado <br /> Mined Land Reclamation Division . The inspection consisted of a <br /> visual examination of embankments , spillways and outlets ; and <br /> measurement of water and sediment levels and discharge volumes . <br /> Water levels are based on past survey information. Sedimentation <br /> levels were estimated based on a prodding stick and information <br /> from you concerning the last cleanout date for each pond. <br /> Several deficiencies were noted on a few of the ponds. The <br /> attached table summarizes the status of each pond at the time of <br /> inspection and the deficiencies that were noted. <br /> The seep at the toe of the Redwood Tank Pond is the most <br /> serious problem noted in the inspection . An investigation should <br /> be made to determine if this seep is coming from groundwater or <br /> from the pond. If it is determined that the seep is of pond <br /> origin, remedial action should be taken to stop this flow. <br /> I certify that the Coal Basin mine site sedimentation ponds <br /> have been inspected to the best of my ability and, with the <br /> exception noted above, are in accordance with the Colorado Mined <br /> Land Reclamation Division ' s rules and regulations . <br /> UDO REG <br /> .............. <br /> C'C Ti'Sl <br /> --.. <br /> James 0 e <br /> '22 3 <br /> cc. Tom Johansen <br /> M. J. Turnipseed "Z., <br /> ......... *"* . '4' <br /> John Turner NAL . <br /> ... <br />