REV03143 - Laserfiche WebLink

Home Browse Search

replaced, in accordance with permit requirements? What are the current practices for ensuring compliance, and what changes have been implemented or will be implemented to ensure that modifications of such magnitude will not be required in the future? 2. Current Table 2.05-1, "Topsoil Schedule for Mining Area", was approved by TR- 42 in 1997. The table provides soil balance projections for the permit terms ending in 2002, 2007, and 2013. More detailed projected soil balance information is provided on an annual basis for 1997 through 2002, on current Table 2.05-2. The projections indicate that the volume of soil to be salvaged would significantly exceed the volume necessary to replace the 1.5 feet average replacement thickness, and further indicate that the "excess" volume would be placed in stockpile. The current volume of stockpiled soil indicated on revised Table 2.05-1, provided with TR-62, is approximately 1 million cubic yazds less than that projected on the current version of the table. Please provide a description and summary of any actual operational data collected on an annual or periodic basis during the previous and current permit terms, corresponding to the projections of current Tables 2.05-I and 2.05-2. Comparison of "actual" versus "projected" removal acreages and volumes, replacement acreages and volumes, and stockpiled volumes, would provide some insight into the reasons for such a large discrepancy in the cumulative volume of topsoil in stockpile. 3. The TR-62 proposed version of Table 2.05-1 is a survey based topsoil balance for a pazticulaz point in time (October, 2005). If the existing disturbance were to be reclaimed with the available soil in stockpile, the table would provide sufficient information for planning purposes. However, in actuality, it appeazs that surface disturbance is projected to continue through at least 2012, and reclamation operations will continue for some time beyond that. Soil replacement thickness should reflect the best estimate of available soil volume to be salvaged from azeas yet to be disturbed, in conjunction with the current volume of soil in stockpile. In addition to the "current" topsoil balance provided in proposed Table 2.05-1, updated versions of the soil balance projections provided. in current Tables 2.05-1 and 2.05-2 should also be provided. Please provide new topsoil balance projection tables for the remainder of the mine life, comparable to current Tables 2.05-1 and 2.05-2. Projections should incorporate salvage volumes estimated for remaining areas to be disturbed, based on acreage and projected salvage thickness for the affected soil types. If experience has shown that original salvage volumes were over- estimated, it may be reasonable to base salvage projections on the low end of the thickness range listed for the deeper soil types, rather than the mid-point.