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Fourth Quarter 1993 <br />ENGINEERING INSPECTION <br />SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE <br />On December 20, 1993, L. Kirt Jewkes performed a visual inspection <br />of the east yard gob disposal area at Somerset Mining Company's <br />Somerset Mine. The gob disposal area was dry. Both Bear Coal <br />Company and Somerset Mining Company have approval to dispose of <br />coal mine waste in the gob pile. <br />Page 2.05-19ii, dated 12-10-92, of Somerset Mining Company's <br />approved permit document includes the requirement to inspect the <br />coal mine waste pile for stability quarterly. The inspection is to <br />be performed --by -a---registered engineer -or other -qualified <br />professional specialist experienced in construction of earth and <br />rockfill embankments. The quarterly inspection report is to note <br />the volume of waste material placed in the pile since the last <br />inspection. Mr. Jewkes is an EIT and graduate of the Colorado <br />School of Mines. He has a wide variety of experience in the <br />construction industry and the construction of earth and rockfill <br />embankments. <br />Bear Coal Company did not haul any material to the gob pile during <br />the quarter. <br />Somerset hauled approximately 352 tons of material to the gob pile <br />during the quarter. <br />The side slopes of the pile vary in steepness from 2H:1V to <br />2.5H:1V. No seepage from under or around the pile was detected <br />during the inspection. Nothing was observed during the inspection <br />that would indicate that the pile has a potential for failure. <br />A failure of the pile would probably not be a hazard to human life. <br />The pile is located above a large flat bench referred to as the <br />east yard. This bench is 80' to 100' wide directly below the pile. <br />If the coal mine waste pile failed, it would very likely be <br />contained in the east yard. The overland conveyor and conveyor <br />drive on the bench below the ~yv1~E~ ht be damaged by a failure of <br />the pile. ~~p00„°°G`'~ls~ <br />f V ~ `l,`v ~ F.. <br />~ ~ Q' <br />~ f` ~ ~icC s E <br />~.oS Colorad <br />CPRTREP4 9~•°O•• Profe~~, <br />'0~~0~;1:L tad <br />•..maa <br />Date <br />1 Engineer No. 19230 <br />