Laserfiche WebLink
Relative to Patt 1: <br />Key considerations relative to topsoil salvage for the runoff collection ditch on the west side of the 18- <br />Right Ventilation Shaft pad include: <br />1) Twentyrnile Coal Company's (TCC) contractor salvaged topsoil from the ditch disturbance area, <br />but limited soil salvage operations to the limits of the staked crest of the ditch in order to limit the <br />associated disturbance. <br />2) The concern which resulted in issuance of an NOV for this area involved minor amounts of <br />topsoil material that had or were sloughing into the ditch, as a result of bank exposure. The related <br />potential for loss or contamination of topsoil would be negligible. <br />3) Any topsoil that does slough into the collection ditch would be captured in the designed ASC <br />sump and rock check dam structure and could be removed and utilized as revegetation media <br />during site reclamation. <br />Relative to Part 2: <br />Key considerations and details relative to storage and protection of the topsoil stockpiled or windrowed <br />along the 18-Right Ventilation Shaft access road include: <br />1) TCC's contractor salvaged topsoil from the entire road comdor prior to road construction and <br />either windrowed the soil along the margin of the road construction comdor or placed it in a <br />topsoil stockpile adjacent to the shaft pad Specifically, topsoil from those areas where significant <br />road cuts would be required or where tipping of rocky areas was required was placed in stockpile, <br />so that an adequate area mmained within the road construction comdor for long-term storage of <br />any excess cut or rocky material adjacent to the road <br />2) During road construction, roadside drainage ditches were established immediately adjacent to the <br />windrowed or stockpiled topsoil, both to provide for effective drainage and to serve as a buffer <br />between the topsoil and the road surface. <br />3) In those areas where significant road cuts were necessary or where rocky material occurred, excess <br />cut material, rocky material, and rocky soils that were not suitable for salvage were placed adjacent <br />to the road In most cases, topsoil previously salvaged from these areas had been placed in <br />stockpile. <br />4) Due to scheduling limitations, most of the topsoil salvage and initial road construction activities <br />for the 18-Right Ventilation Shaft occurred in late 2004 under less than favorable weather <br />conditions. <br />5) The concern that resulted in issuance of an NOV for this area involved field observations that; a <br />thin layer of road-base material was found on top of the windrowed topsoil; the windrowed topsoil <br />was not adequately separated from the access road to avoid contamination; the location and <br />configuration of the stockpiled and windrowed topsoil was considered to be potentially subject to <br />erosion and contamination, and there were indications that some mixing of cut material and topsoil <br />may have occurred. <br />NOV CV-2005-005 2 6/3/2005 <br />