Laserfiche WebLink
III IIIIIIIIIIIII III <br />999 <br />5731 State Highway 13 <br />Meeker. Colorado 81641 <br />(303) 824-4451 <br />(303} 824-4459 FAx <br />RFCFi~i~r_, <br />MAY 12 1995 <br />i1iVIS10f1 Of iN10ef81S Li UbulUy] <br />Ms. Erica Crosby <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: NOV C-95-005, Consultant's Report <br />Colowyo Coal Co. L. P., C-81-019 <br />Dear Ms Crosby: <br />May 9, 1995 <br />Attached, please find a report from Mr. Mark Gray of CTL/Thompson, Inc. concerning <br />the landslide in the vicinity of the West Pit Pond. <br />In requesting CTL/Thompson to visit the pond we were primarily concerned with three <br />items; 11 the cause or causes of the slide, 21 the stability of the West Pit Pond embankment <br />and 31 recommended measures to repair the slide, <br />11 The cause or causes of the slide - Mr. Gray believes the primary factor which <br />initiated the slide was seepage of water from the south. Further, he believes it is possible the <br />landslide could have occurred without the presence of the topsoil stockpile. <br />2) Stability of the West Pit Pond Embankment -Our primary concern is for the integrity <br />of the pond embankment. If a failure was imminent, we wanted to be proactive and correct <br />any potential problems with the embankment before any problems developed. With that in <br />mind, Mr. Gray was asked to evaluate the integrity of the pond. In Mr. Gray's opinion the <br />stability of the embankment has not been reduced by the slide. We continue to monitor the <br />situation as required. <br />31 Repair measures - Mr. Gray has recommended that a french drain (similar in <br />configuration to the lateral subdrains successfully installed under the West Pit Fill) be installed <br />in the side of the pond to drain the water. Colowyo plans to construct such a lateral drain as <br />soon as conditions permit access to the site and the topsoil can first be removed. <br />Please contact me if you have any questions concerning this matter. <br />Si cerely, /~ ~~ <br />Ja e~s~AAKiger ` <br />S .Environmental Specialist <br />Attachment <br />xc: R.G.Atkinson <br />Files <br />An alfil~iate of Kennecott Energy <br />and Coal Company <br />