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Sundance Sand and Gravel Resource, M-200&073 <br />Response to Adequacy Review 01 <br />February 20, 2007 <br />Page 4 <br />Phase 118 <br />Phase IIB will have a slurry wall installed around the perimeter of the <br />water storage area prior to stripping and mining. Approximately one-half <br />of the overburden will be hauled and placed into Phase IIA during the <br />initial mining of Phase IIB to complete the reclamation of Phase IIA. The <br />area to be reclaimed as rangeland in Phase IIB will be mined using <br />standard stripping and dewatering sand and gravel mining methods <br />(stripping, perimeter trenched, dewatered, and gravel extracted). This <br />area will be backfilled as additional stripping is completed in the area to <br />be reclaimed as water storage. Mining within the water storage area of <br />Phase IIB will be mined to the final reclaimed slopes with stripping to <br />occur in smaller stages to minimize the amount of disturbed area within <br />Phase IIB at any one time. It is anticipated that the mining will allow for <br />areas to be reclaimed to final slopes within 5 years of disturbance in <br />each of these areas. <br />C. Lafarge will compact backfill material to a minimum of 85 percent <br />compaction. <br />D. Lafarge commits to plugging any and all drill or auger holes, that are part <br />of the mining operation, with anon-combustible material within 24 hours. <br />E. Lafarge commits to developing and implementing a Storm Water <br />Management Plan (SWMP) and Spill Prevention Control and <br />Countermeasures Plan (SPCC) to prevent pollutants from entering the <br />surface drainage system. <br />F. Lafarge commits to preventing any release of pollutants into the <br />groundwater from any materials mined, handled or disposed of within the <br />permit area. in addition, this issue is addressed with the SWMP and <br />SPCC for the site. <br />3. Rule 6.4.5 (2)(d) & (t](v) Topsoil Segregation Plan: Topsoil will be <br />removed and stockpiled separately. The amount of topsoil to be stockpiled <br />will be enough to spread over the disturbed areas to a depth of at least 6 <br />inches. Topsoil will be removed and stockpiled (see Exhibit F: <br />Reclamation Plan Map for topsoil stockpile location), followed by the <br />removal of subsoil. Subsoil will be stockpiled separately in order to keep <br />the topsoil rich in organic matter and microorganisms. Because the <br />subsoil is composed of mainly clays and loams, the replacement of the <br />subsoil, along with the topsoil, will create adequate support for a strong <br />vegetative community. <br />