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Grading will be performed to help control erosion and siltation of the affected lands through <br /> phased mining, implementing good operation techniques to handle material as little as <br /> possible, and vegetation of stockpiles remaining in place for more than 180 days with the <br /> Weld County Sandy Site seed mix: <br /> Weld County- Sandy Site Mix <br /> Bluestem (Champ, Chet) 1.00 lbs pis/acre <br /> Sand Lovegrass (Bend, Native, Ne27) 2.50 Ibs pis/acre <br /> Indian Ricegrass (Nezpar, Rimrock) 3.00 Ibs plslacre <br /> Prairie Sandreed (Goshen) 0.75 Ibs pis/acre <br /> Green Needlegrass (Lodorm) 1.50 Ibs plslacre <br /> Little bluestem (Blaze, Cimarron, Camper) 0.75 Ibs pis/acre <br /> Yellow Indiangrass (Cheyenne, Holt, Scout) 0.50 Ibs pis/acre <br /> Switchgrass (Blackwell, Nebraska 28) 1.50 Ibs pis/acre <br /> Sand Dropseed 0.50 Ibs plslacre <br /> Total: 12.00 pounds pis/acre <br /> Although the use of erosion protection devices is not anticipated, if deemed necessary by <br /> the operator at the time of excavation, silt fence, haybale dams or other erosion control <br /> devices will be installed. Backfilling and grading will be completed as soon as feasible as <br /> the mining process is completed for each phase. <br /> Maximum slopes and slope combinations will be compatible with the configuration of <br /> surrounding conditions and selected land use. Mining will occur at a slope that is stable. <br /> Reclaimed slopes in the water storage reservoir will not be steeper than a 3:1 ratio and will <br /> be mined/reclaimed at a 3:1 ratio for the slurry wall lined cell mined at 3:1 ratio. A <br /> representative sample of the fill material will be analyzed for shear strength and optimal <br /> moisture content prior to backfilling the slope. The material will be worked to the optimal <br /> moisture content as determined by Proctor compaction tests and placed back into the <br /> slope at no more than one-foot lifts. The lifts will be compacted with a sheepsfoot roller to <br /> tie lifts together. The upland area will be reclaimed to grades consistent with pre-mining <br /> drainage patterns. <br /> The operator will backfill using fill material generated on-site, or imported inert fill <br /> generated outside the permit area. If any inert off-site material is used as backfill, a <br /> notarized letter will be submitted to the Division as required by Section 3.1.5(9) of the <br /> MLRB Construction Material Rules and Regulations. <br /> It is not anticipated that mining will uncover any refuse or acid-forming or toxic producing <br /> materials, however if any such materials are encountered the operator will take precaution <br /> to handle the materials in a manner that will control unsightliness and protect the drainage <br /> system. <br /> Drill or auger holes that are part of the mining operation shall be plugged with non- <br /> combustible material, which shall prevent harmful or polluting drainage. Any test pits, soils <br /> boring holes, or monitoring wells not located within the mine excavation limits will be <br /> plugged as soon as it can be confirmed that they are no longer needed for the operation. <br /> 70 Ranch-Section 25 Sand Mine—MLRB 112 Permit Application <br /> Exhibit E-2 <br />