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• Topsoil Management <br />Rule 2.05 <br />Due to the abundance of deep, high quality r1 horizon loamy soils within most of the affected areas, only <br />the A horizon was stripped from dismrbed areas. Topsoil stripping volumes were calculated using an <br />average topsoil depth for each soil series. For example, the Routt soil series, which covered about 55% <br />of the total disturbed area, ranged in depth from 20-34 inches as determined by field sampling. A good <br />approximation of the average topsoil depth, for the A Horizon, was calculated by adding the high and low <br />values then dividing by two: <br />20"+ 34" = 54" _ 2 = 27" average topsoil depth. <br />• <br />Within the mine azea, a clear color differentiation between the A and B horizons assisted accurate topsoil <br />removal operations. In addition, cut stakes placed by an environmental engineer prior to topsoil removal <br />were used to guide equipment operators. <br />Prior to topsoil removal, vegetation was cleared using a brash rake mounted on a dozer. Topsoil was <br />stripped with 27 yard capauty, self-loading scrapers according to soil type and the depths shown below <br />in Table 2.05-5. In general, topsoil was only stockpiled when it was impracticable to immediately <br />redistribute such material on regraded azeas. <br />TABLE 2.05.5 <br />TOPSOIL STRIPPING DATA <br /> <br />Map Unit' <br />Soil Series Stripping Depth <br />IA horizon only) Area Stripped <br />lacreslz Percent of <br />Area <br />2 VD Routt Loam 20 - 48 inches 198 55 <br />2 VF Routt Loam 20 - 48 inches 7 2 <br />66 D Sk lick loam 18 - 31 inches 35 10 <br />68 C Unnamed sand loam 5 - 24 inches 70 19 <br />X8F Winevada-Splitro Com lex 7 - 15 inches 51 14 <br />' As shown on soil survey map in Appendix D 361 100 <br />z Approximate acreages calculated by superimposing disturbed area boundary on undated <br />soils map found in Appendix B. Acreages may not match disturbed area boundaries due <br />to map distortion and boundary accuracy limitations. <br />dll topsoil stockpiles were seeded with quick growing annual and perennial plant species during the first <br />favorable conditions for seeding. Prior to use for reclamation, all topsoil was tested by a qualified <br />laboratory to determine nutrient or amendment requirements in order to support adequate plant growth. <br />Topsoiled azeas were also tested prior to seeding. Routine soil analyses included pH, salts, organic matter, <br />nitrogen, phosphorus, potassium, zinc, iron and texture. Fertilizer recommendations obtained from the <br />soil tests were followed and applied during seeding in the spring and fall. Topsoil locations prior to final <br />reclamation are shown on Map 1. <br />• During fmal mine reclamation, topsoil was replaced to an average depth of 21 inches pursuant to HGCC <br />commitments made in January 1985 and accepted by the IvILRD via letter of 1/21/1988. <br />2.05-6 Revised - 11/28/95 <br />