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Stockpiled Soil Salva>?e Option. If final graded backfill is not available for direct haul topsoil and <br />subsoil placement, GCC will utilize the following removal option: <br />1. To minimize compaction, destruction of soil structure and anaerobic decomposition within the <br />stockpile, soil removal activities should be scheduled at soil moisture levels sufficient to <br />minimize dust yet dry enough to minimize soil mucking. Ideal soil moisture conditions for soil <br />salvage are above the wilting point and below field capacity. <br />2. Topsoil (A, E and AC- horizons) will be removed, handled and stockpiled as a separate layer from <br />the area to be disturbed. This salvaged topsoil will be hauled and placed on an appropriately <br />located and designed topsoil stockpile. <br />3. If the native topsoil is less than 6- inches thick, Rio Grande will remove the topsoil and the <br />unconsolidated AC and /or B- horizon material immediately below the topsoil and treat the entire 6 <br />inch mixture as topsoil. Suitable AC and /or B- horizon subsoil will be managed as subsoil to be <br />removed and stockpiled. <br />4. Stripping of topsoil from the bottom of drainages should be given first priority to prevent <br />contamination of topsoil by disturbed runoff It may be necessary to strip drainage corridors to <br />establish proper drainage prior to additional topsoil removal. <br />5. Suitable subsoil (AC and B- horizons) will be removed, handled and stockpiled as a separate layer <br />from the area to be disturbed. This salvaged subsoil will be hauled and placed on an appropriately <br />located and designed subsoil stockpiles. Subsoil suitability discussions for each soil series are <br />contained in Exhibit I — Soils Information. <br />6. Topsoil and subsoil will be separately stockpiled in areas shown on Exhibit D -l. <br />7. The soil removal crew will be provided with a detailed map showing the stripping depths, and a <br />qualified individual will ensure that soil is removed to the specified depth. Topsoil identification <br />for equipment operators is most successful if related to soil mapping location, depth, color, <br />structure, texture and salt and /or calcium carbonate deposition. <br />Soil Stockpile and Erosion Control Plan. Topsoil will be stockpiled in such a manner so as to minimize <br />wind and water erosion and unnecessary compaction. The primary methods of erosion control for soil <br />stockpiles are timely revegetation and /or the use of temporary erosion control measures such as surface <br />roughening, surface mulches, berms, ditches, or small sediment traps. All soil stockpiles will be <br />constructed with 2.5h:1v or flatter slopes, and a ring ditch will be bladed around the base of each <br />stockpile. All A- horizon topsoil stockpiles will be identified by a "Topsoil" sign having 6 -inch lettering. <br />All B or AC- horizon subsoil stockpiles will be identified by a "Subsoil" sign having 6 -inch lettering. <br />Stockpiled soil will be seeded with the stabilizing revegetation mixture during the first appropriate <br />season. A sterile cover crop (Triticale) may be utilized as a nurse crop and stubble mulch. <br />Temporary Soil Stockpiles. In limited situations, topsoil and /or subsoil materials may be temporarily <br />stockpiled or windrowed near active operations rather than placed in permanent stockpiles. These <br />situations would occur when the salvaged soil is needed for current reclamation, but the area is not <br />immediately ready for soil to be respread. Temporary soil stockpiles will be seeded as soon as possible <br />Technical Rev No. 4 <br />April 26, 2013 <br />Topsoil identification for equipment operators is best if related to soil mapping location, depth, <br />color, structure, texture and salt and /or calcium carbonate deposition. <br />D -6 <br />