2013-06-12_PERMIT FILE - C1994082 (5)

Home Browse Search

been missed during the rough grading process (when bulk earth movement, in the quickest manner possible, is the goal). As with the other motor grader tasks above, this was traditionally a dozer task. In fact, at one point SCC included an additional 10% of all rough grading hours for final grading. Again, based on negotiations with SCC several years ago, this was changed to a motor grader task. Drainage Control System Removal /Construction Removal includes all of the ditches on the site, including those that report to a sediment pond and those that carry sediment pond discharge to a receiving stream. Again, this was traditionally a much more detailed dozer task group that was changed to a motor grader task based on negations with SCC several years ago. Also included is the removal of all sediment ponds. This is a dozer task that removes the pond embankment and forms the final drainage. The construction portion consists of the time and materials cost to install/construct the remaining postmine drainage channels not in place as of August 25, 2004. The steps required are excavation of the channel, installation of a geo- textile and then placing riprap of a determined size over the geo - textile. Topsoil Replacement. Topsoil replacement volumes were based on the maximum volume of material placed in stockpiles over the life of the permit. The estimated volume in each stockpile was based on surveys and/or the average topsoil salvage depth per soil type over a particular area (acres). The Division used topsoil volumes that were in the Yoast Permit document. The correct topsoil volumes (the ones that the Division used in recalculating the reclamation cost estimate) are a hybrid based on the 1999, 2001 and 2002 Annual Reclamation Reports. This will result in an increase in topsoil replacement volumes from 777.9 acre - feet (used in the RN -02 estimate) to 826.8 acre -feet (used in the recalculation). This is necessary because the Division must keep costs associated with ALL topsoil replacement until a phased bond release application is submitted and approved. With the floating bond concept, the only liability costs that "float" are for the backfilling and grading of the pits. All of the other costs are cumulative (including topsoil replacement and revegetation). While the 826.8 acre -feet is a greater volume than currently used, it does not take into account the maximum pile volume for each stockpile for the life -of -mine. The maximum pile volume for the life of mine is 949.8 acre -feet of stockpiled topsoil. The volume used by the Division represents hybrid of the topsoil replacement based on the 1999, 2001 and 2002 Annual Reclamation Reports. The following chart shows topsoil volumes at the Yoast Mine. TR -53 4 Revised 05/13