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Second Quarter 1993 <br />ENGINEERING INSPECTION <br />SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE <br />On July 3, 1993 I performed a visual inspection of the east yard <br />gob disposal area at Somerset Mining Company's Somerset Mine. The <br />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 12-10-92, 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. <br />Bear Coal Company did not haul any material to the gob pile during <br />the quarter. <br />Somerset hauled approximately 968 tons of material to the gob pile <br />during the quarter. Somerset has been working the gob pile during <br />the quarter to correct deficiencies noted in the first quarter <br />inspection report. The material on the top of the pile has been <br />compacted. The upland diversion ditches as shown on permit page B- <br />138 have been reestablished. <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 pile might be damaged by a failure of <br />the pile. <br />~~PpO RE~~' <br />o~~s E. St <br />~'Q <br />~*;~ E <br />~,o ; Colorad <br />.~ •. Profess <br />.o,,, •.. <br />cexaxee~ ~~~f •'••.•••'~ <br />.~ 7-8- . <br />er Date <br />stered <br />Engineer No. 19230 <br />