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11%15iU0 Ii'ED 15: J: F.aS JOJ ~Ji 5-19J thr. Pendletons "I1I'1I"II"II "I <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcparuncrn "f Napv, l Resources <br />1313 Shaman Sl.. Roum 275 <br />Denver, Colorado AU2U3 D t v 1 5 r O N o f <br />Phone: (3037 866.3567 MINERAL 5 <br />FAX: (30]1 832-8) OG & <br />GEOLOGY <br />DATE: November 15, 2000 RECLAMATION <br />MINING•SA SETT <br />r~ <br />t t glll Owens <br />TO: Jlm Burnell ~ 1r~-~ Cavernu <br />Greg E. WaI<hcr <br />FROM: Jim Pendleton ^~ EaccuFvc olr«tur <br />.~ \ Michxl B. Long <br />~ 17•~rian D~recror <br />RE: West Elk lyfine yWright Water Engineer's <br />Technical )port - "Pre-Mining Stream Channel <br />Conditions on Deep Creek" <br />I completed a review of the Technical Memorandum prepared by <br />Wright Water Engineers (WWE) for the Mountain Coal Company's <br />(MCC) West Elk Mine's Deep Creek. The Division had placed the <br />condition ofcompletion ofpre-mining sediment and channel <br />hydraulics studies upon approval of the Box Canyon revision. The <br />purpose of these comparative studies are to determine what <br />hydraulic loss results from Honing beneath and adjacent to the creek. <br />MCC contracted with WWE for the completion of the required studies. <br />Hydraulic observations were performed by Ernie Pemberton and <br />Jonathan Kelly of WWE in cooperation with Dave Nicewicz of West Elk <br />Land Surveying during June of 2000. West Elk Land Surveying also <br />performed the thalweg and cross section land surface surveys for the <br />study, as depicted on Drawing Number 1. The pre-mining and post- <br />m;n;ng survey surfaces were used to calculate and compare the <br />observed and projected water movement within the surface and <br />adjacent geologic materials of Deep Creek <br />The report presents a summary of field hydraulic observations. <br />Eight photographs are provided to verify the observations. Like <br />most upland stream channels, the flood plain of Deep Creek is <br />scattered with dead log snags. The sediment along the channel is <br />predominantly sand sized (approximately 0.30 millimeters in <br />diameter), including large cobbles and boulders between 1 and 2 feet <br />in diameter. The photographs display in general that Deep Creek is a <br />well incised perennial stream which is degrading over tune. The <br />boulders and cobbles scattered aver the channel floor suggest that <br />