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Third Quarter 1992 <br />ENGINEERING INSPECTION <br />SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE <br />On September 30, 1992 I performed a visual inspection of the east <br />yard gob disposal area at Somerset Mining Company's Somerset Mine. <br />The gob disposal area was dry. Both Bear Coal Company and Somerset <br />Mining Company have approval to dispose of coal mine waste in the <br />gob pile. <br />Page 2.05-19ii, dated 12-17-90, 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. <br />Bear Coal Company did not haul any material to the gob pile during <br />the quarter. <br />Somerset hauled approximately 1400 tons of material to the gob pile <br />during the quarter. Since the inspection on September 30th, this <br />material has been worked into the pile and compacted. <br />The side slopes of the pile vary in steepness from 2H:1V to <br />2.SH: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 />or property. The pile is located above a large flat bench referred <br />to as the east yard. This bench is 80' to 100' wide directly below <br />the pile. If the coal mine waste pile failed it would very likely <br />be contained in the east yard. <br />G <br />!/ Colorado Rega~s~'ere~230 ; ~ ~ <br />Professionals t~gineer No.;,~230 <br />v" : ~ `"1 <br />CERTREPJ ~'PO ~~~ '~i ~~,~ <br />~ ~~~~• <br />~~'iS./OMAI~~~~ <br />I <br />{ <br />i <br />