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Third Quarter 1993 <br />ENGINEERING INSPECTION <br />SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE <br />On September 25, 1993, L. Kirt Jewkes performed a visual inspection <br />of the east yard goti 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 376 tons of material to the gob pile <br />during the quarter. Somerset worked on the pile during the <br />quarter. During September 15th through 17th approximately 1750 <br />cubic yards of topsoil was salvaged from the east limit of the gob <br />pile. The east side of the pile was filled. The top of the pile <br />slopes to the west to provide positive drainage. The west outslope <br />was worked 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 pile ~,i~l~•~ damaged by a failure of <br />the pile. ~~~P~,......;st~i <br />. o •~ E..c.._ 9_. <br />a <br />r. /o-S-93 <br />~! Date <br />I <br />.~ <br />CERTREF7 <br />,.e <br />Weer No. 19230 <br />