Laserfiche WebLink
• three to four years to evaluate interactions between rooting depths and soil/spoil quality (Schafer et <br />al., 1979). <br />Spoil Sampling in the Lennox Coal Outcrop Area and the Graded Wadge Spoil. Spoil sampling <br />was conducted in 2004 and the data is presented in the Soils Report attached. <br />• 2004 Soil Replacement Thickness <br />SCC is required by Permit C-82-057 and Section 4.06.4(2)(6) of Colorado's Regulations for Coal <br />Mining to document and record the soil replacement thickness for each reclamation block using a <br />minimum sampling intensity of one hole per five acres. The soil replacement thickness information is <br />used to adjust soIl salvage depths, if necessary, and for bond release purposes. Sampling is conducted <br />on a 500-foot grid. A random check of soil replacement on the "A" pit area indicated an average <br />replacement depth of 26 inches over 28 samples (rampled by RI: a>rd14Bf. <br />• Soil Balance <br />SCC submitted a soil balance with Permit Revision 04 (dated 9/04). The soil balance is completed to <br />ensure soil is salvaged, stockpiled, and replaced as recommended and approved in the permit, and, if <br />necessary, to readjust the sod salvage and redistribution thickness. The soil information is also used to <br />update the so$ volume information previously submitted and confirm the mean soil replacement <br />thickness. <br />Soil SaWage and Storage. The disturbance azea from which soil was salvaged and the soil stockpile <br />• sites as of December 31, 2004 axe shown on Seneca II-W Mine 2004 Reclamation Map. <br />The actual volume of soil salvaged and stockp$ed from 1989 through December 31, 2004 was <br />determined by field survey of existing soil storage stockpiles. The Seneca engineering staff completed <br />the base and existing elevations fox each stockpile. The stockpile volumes as of December 31, 2004 <br />aze listed in Table 04.1. As of December 31, 2004, 73.1 acre-feet of soil were stockpiled along the rie- <br />across haul road and 698.1 acre-feet of soil remain stockpiled in the mining azea. <br />Soil Balance and Replacement The soil balance is calculated for Seneca II-W Mine by comparing <br />the disturbance azea that requires soil replacement as of December 31, 2004 and replacement depth <br />with the soil reserve in stockpiles. The disturbance area fox Seneca II-W Mine, shown on the map, <br />with exception to the tie-across haul road, totaled 1082 acres on December 31, 2003. No soil was <br />salvaged or needs to be replaced beneath the soil stockpile sites. Also, since Pond 005 (4.8 acres), <br />Pond 006 (7.9 acres), the Mine Entrance Road, Haul Road A, and Haul Road G aze permanent <br />postmine facilities (11.2 acres), soil will only be replaced on a portion of those roads after removal of <br />the berms. Topsoil was replaced on 209.8 acres of disturbed area in 2004, <br />Soil Replacement Thickness. The soil replacement thickness fox the first five-yeaz permit term was <br />projected to be 1.4 feet Eor the mine area and 0.7 feet for the tie-across haul road. The soil balance as <br />of December 31, 2004 was calculated as follows: <br />Mine Area <br />Total disturbance azea = 1,158 acres <br />Permanent Fadlities & Topsoil replaced = 685 acres <br />Disturbance area requiring soil = 473 aces <br />Soil in stockpiles (fable 04.1) = 698.1 acre-feet <br />• Mean replacement depth = 1.48 feet <br />Tie Across Haul Road <br />Disturbance azea requiring soil = 96.6 acres <br />Soil in stockpiles (fable 00.1} = 73.1 acre-feet <br />