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2010-05-25_REVISION - C1981008 (8)
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2010-05-25_REVISION - C1981008 (8)
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Entry Properties
Last modified
8/24/2016 4:12:26 PM
Creation date
5/26/2010 10:19:20 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
Revision
Doc Date
5/25/2010
Doc Name
Response 1 Revised Pages Section 2.05.4(2)(d)
Type & Sequence
PR6
Media Type
D
Archive
No
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from all significant disturbance areas including sediment ponds (includes pond area, <br />embankment, and spillway), mining activities, spoil stockpiles, haul roads, access roads, <br />mining area (includes box cut spoil and highwall reduction area) shop area, and diversion <br />ditches. Topsoil was removed from all cut and fill slopes. No topsoil was salvaged from the <br />light use roads utilized for environmental monitoring or power line corridors, except where cut <br />and fills are required. Prior to topsoil removal, vegetation which is too large for incorporation <br />into the topsoil was scraped away and combined with the overburden. The remaining <br />vegetation was incorporated into the topsoil to help increase soil organic matter levels. To <br />prevent unnecessary contamination, adequate extent of topsoil was salvaged from the edge of <br />a road, embankment, ditch, cut slope, and toe of fill. <br />For the original permit area, a two -lift topsoil operation was utilized for the two primary premine <br />irrigated pastureland soil types (30C and D70B), whereby the "A" and upper "B" horizons (Lift <br />A) are salvaged separately from the lower "B" and "C" soil horizons (Lift B) (1988 - 1996 <br />disturbance area). <br />Specific Soil Map Units (11E, 1 EW, and 808) at New Horizon 2 (1988 - 1996 disturbance area) <br />was more suited for mixed one -lift topsoil salvage because they are very shallow to shallow, <br />have little profile development, and /or are excessively stratified. The salvageable topsoil from <br />these units was primarily utilized, whenever feasible, in postmine dry pastureland area. One -lift <br />topsoil was isolated from the two -lift topsoil during all soil handling operations. <br />For the portions of the 1999 expansion area that were disturbed prior to February 2008, the A, <br />Bt, Bw, Bk and C horizons were combined for salvage in a mixed lift and suitable subsoil <br />(Bench 1 material) was salvaged and placed in lift B. The Map 2.05.4 -4 shows the thicknesses <br />of both materials that were placed in these areas as part of the reclamation. <br />Appropriate adjustments will be made to the recovery rate as dictated by actual field conditions <br />and initial topsoil balance reports. The actual amount of topsoil salvaged has been less than the <br />amount estimated in the soil survey. As of July 1994, WFC has experienced an overall <br />recovery of 80 percent compared to the volumes shown in the soil surveys. Table 2.05.4(2)(d) -4 <br />reflects estimated salvage quantities for the 1995 study area and Table 2.05.4(2)(d) -5 reflects <br />estimated salvage quantities for the 1999 disturbance area prior to February 2008. <br />(Revised October 2009) 2.05.4(2)(d) -30 <br />
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