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First Quarter 1993 ENGINEERING INSPECTION SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE On March 31, 1993 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. Somerset hauled approximately 1,600 tons of material to the gob pile during the quarter. The top lift in the pile is loose and needs to be compacted. The gob material placed in the pile during the first quarter was placed during inclement weather and was not placed and compacted appropriately. The ditches around the gob pile need to be reestablished. The side slopes of the pile vary 2.5H:1V. No seepage from under or during the inspection. Nothing was that would indicate that the pile although work must be performed o quarter of 1993. in steepness from 2H:lV to around the pile was detected observed during the inspection has a potential for failure i the pile during the second 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. ames E. S over Colorado Registered Professional Engineer No. CERTREPI 6 5'3 Date 19230