2006-12-11_REVISION - M1994005 - Laserfiche WebLink

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~ ~ ' United Companies, Inc. March 21, 199d Page 4 feat distance ie the existing residence and out building on the property vhieh will be removed and an aleetrienl line that feeds i the existing residence which will be used Por the pit operation. The existing electric line will 6e removed and relocated as the pit ' progresses. The electrical line is en overhead line that extends up the northeast side of the proposed gravel pit and along the north side of the roadway along the north side of the pit. In addition a telephone line exists along the north side. On the vest side a water and telephone exists between the property and U.S. Highway 550. ' Tha mining operation consists of a relatively shallow ezeavation to remove the gravel layer to a depth of 25 to 30 feet. The drill logs did not encounter the shale bedrock to the maximum depth explored 25 feet. No water was encountered in the drill holes and ' is not expected to be a factor in the pit operation. ' TAe angle of repose is the angle Prom a horizontal plane that a dry, loose cohesionless granular soil is stable. For the existing ' granular material the angle of repose is on the order of 32 to l6 degrees. The angle of repose can be considered equal to the. angle of internal friction when the soils are in a very loose condition. ' However, the angle of internal friction increases with increased density and is dependent on particle size, shape, gradation and ' composition. The existing pit run malarial is medium dense to dense. Thus, an internal friction angle on the order of 40 to 4a ' degrees is reasonable for the pit run material. For a purely cohesionless material the slope stability equation reduces to: ' S.g.= tan 0 tan i~ Where 0 = internal friction angle ' i~ = angle of repose using the above formula Eor the pit run material at a slope angle 1 Colons Pit November 06 S-8