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Second Quarter 1991 ENGINEERING INSPECTION SOMERSET MINING COMPANY'S EAST YARD GOB DISPOSAL PILE On June 26, 1991, I performed a visual inspection of the east yard gob disposal area at Somerset Mining Company's Somerset Mine. The gob disposal area was dry. Both Bear Cosl Company and Somerset Mining Company have approval to dispose of coal mine waste in the gob pile. Page 2.05-19, revision 3 dated ?-18-90, oP 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 hauled 165 tons of material to the gob pile during the quarter. The material came from sediment pond clean out. As of the date of the inspection the material had not been compacted. No organic material or topsoil was removed from the perimeter of the pile during the quarter. 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 ob- served 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 directl,v below the pile. If the coal mine waste pile failed it would very likely be contained in the east yard. !n0 OJames E. St ~ E.' ~~O'; ad IY4~te Colorado Re~i6~'ered ~`~ ~ Profession~~~ng$®~ No>'k~9230 • ~ CERTREF'L :~'. d~`~a • F •....... ~ i •~~~ONAL ENi~• •...~•