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Fourth Quarter 1992 ENGINEERING INSPECTION SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE On November 16, 1992 I performed a visual inspection of the east yard gob disposal area at Somerset Mining Company's Somerset Mine. The gob disposal area was damp. Both Bear Coal Company and Somerset Mining Company have approval to dispose of coal mine waste in the gob pile. Page 2.05-19ii, dated 12-17-90, of Somerset Mining Company's approved permit document includes the requirement to inspect the coal mine waste pile for stability quarterly. The inspection is to be performed by a registered engineer or other qualified professional specialist experienced in construction of earth and rockfill embankments. The quarterly inspection report is to note the volume of waste material placed in the pile since the last inspection. Bear Coal Company did not haul any material to the gob pile during the quarter. During the inspection Somerset was hauling gob material to the pile. Somerset hauled approximately 4,793 tons of material to the gob pile during the quarter. I did not inspect the pile at the end of the quarter so I am unable to determine if all of the material hauled to the pile had been compacted. The side slopes of the pile vary in steepness from 2H:1V to 2.5H:1V. No seepage from under or around the pile was detected during the inspection. Nothing was observed during the inspection that would indicate that the pile has a potential for failure. A failure of the pile would probably not be a hazard to human life or property. The pile is located above a large flat bench referred to as the east yard. This bench is 80' to 100' wide directly below the pile. If the coal mine waste pile failed it would very likely be contained in the east yard. ~f~~, /-8-93 Flames E. Stoyp~~~~ Date Colorado I~~®St~~~l Professin ~~'rFA1A~1a~~.No. 19230 ceexeee~ ~ v ~ Q A, , *;~ 19230 *~ • : ~o ~A• •W~ ~~~ :. 4,~ ~~:~ONA~;~~~