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First Quarter 1992 INSPECTION SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE On April 1, 1992 I performed a visual inspection of the east yard gob disposal area at Somerset Mining Company's Somerset Mine. Both Bear Coal Company and Somerset Mining Company have approval to dispose of coal mine waste in the gob pile. Page 2.05-19, revision 3 dated 7-18-90, 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. No gob was hauled to the pile during the quarter. Topsoil was removed from the east side of the pile during the fourth quarter in anticipation of working the gob pile in that direction in the future. A portion of the top of the pile was graded towards the east. The pile should be reworked at the top and towards the east edge and compacted. Additional topsoil should be salvaged before additional gob is placed on the east edge of the pile. The side slopes of the pile vary in steepness from 2H:lV 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. /Colorado RegVeidE~•Srp•;~'~er'D Professional~neer Nc~r~~~230 *;~ 19230 ~;*i CERTREFI ~ ~Ai i W~ •• •• ~~i~DAfl~. ~~11