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MINING PLAN <br /> gopher holes were located. Once the drainage from the building was corrected to meet design <br /> specifications, the slumpage stopped, even after very large storms. <br /> Clearly, slope failure can occur in sand,but it usually requires special circumstances for it to <br /> occur. This is primarily because the sand drains so well it takes a great deal of water over a short <br /> period of time to saturate it sufficiently to cause a slump. <br /> Ditch corridor and Highway Slopes: After considerable discussion with the affected parties <br /> and consideration of various approaches, it was decided the, Lope above the ditch leading to the <br /> south edge of the highway corridor should be 4:1 with the maintenance road for the ditch between <br /> the slope"an accluaTc7itch installation. Although a 3:1 might be sufficient in most cases, the fact <br /> that the slope will be in sand and south facing indicated that 4:1 would be safer. In past experience <br /> west of Academy Boulevard, the 2.5:1 to 3:1 slope there caused difficulties with erosion of sand into <br /> the ditch until the slope was well stabilized. Portions of the slope east of Academy will be higher <br /> than the slope west of Academy. <br /> Figure 1 shows a possible approach to creating the ditch corridor and highway slope. This <br /> same approach would be used on the east side of the operation(west facing slope)where the ditch <br /> turns south to join the current ditch route. It is apparent that the ntire dit corridor must <br /> excavated before the ditch can actually be installed. By excavating the ditch corridor in sections or in <br /> sequence from one end to the other, reclamation can be implemented on the highway slope above the <br /> ditch as portions are finished. <br /> To continue supplying the recharge pond on the west side of the North Area just north of the <br /> tunnel under Academy Boulevard, a small ditch will be installed from the main Fountain Mutual <br /> Ditch where it comes out from under the new highway. This small ditch will connect with the <br /> existing concrete ditch and will feed the water to the recharge pond. A gate will be installed at the <br /> head of this small ditch so the water to the recharge pond can be controlled. <br /> Zhe highway slope above the ditch-vill be excavated at the final slope so e f_ anal Slone is <br /> composed of native6on-bacckfilled materia eep backfill of these slopes tends to create slopes that <br /> are inherently less stable than slopes created in native material. Both can be subject to erosion,but <br /> backfilling tends to add the possibility of massive slumping of the slope into the ditch which would <br /> dam the ditch and potentially produce an overflow and severe damage to the slope below the ditch. <br /> These could be very expensive and time consuming to repair and the concrete lined ditch itself could <br /> be damaged. <br /> The ditch level at the base of the slope must be carefully created so the surface elevation is at <br /> exactly the proper level so when the ditch is actually installed it can be constructed in native material <br /> and follow a precise elevation. As is true of the current ditch, the elevation drop from where the ditch <br /> Daniels Sand Pit Amendment (2008) Exhibit D Page 22 of 28 <br />