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Positive grediente will be maintained for surface runoff above the reconstructed slide <br />area. Xaul road drainage will be observed to ensure that it is not being intercepted by <br />cracks within the drainage ditch and allowed to infiltrate into the fill. <br />Reconstruetion <br />The slide material will be dozed or hauled down to the toe of the slide, across the dam, <br />and to the excess spoil pile east of Pond OOb. there ere two options at this point for the <br />slide repair end stabilization. <br />Option 1. If, in the act of removing [he slide materiel, competent bedrock (claystone) is <br />encountered, slide remediation will be conducted much like the Pond 006 slide repair. The <br />haul road will be moved to the south approximately 25 feet to allow for slope reduction. <br />The resulting outslope will be 2:h to t:v (see Figure 73-4B-3). According to [he SB-SLOPE <br />estimate, this will result in a factor of safety of 7.B9 (see Figure 73-48-5). <br />The emergency spillway for Pond 006 will be shaped and riprapped to its original design <br />configuration. <br />Option 2. If, for some unknown reason competent claystone is not encountered, after <br />removal of the slide material, reconstruction of the slope will take place. Based on the <br />results of Standard Proctor tests, material that was hauled from the site will be hauled <br />back to the site once the moisture conditions are acceptable (approximately 75 percent). <br />The material will be compacted in lifts (approximately 90 percent) with each bench having <br />an approximate height of 20 feet and a finished width of 10 feet. Slope to the next bench <br />will be 7-1/2:7, resulting in en overall slope of 2h:1v from head to toe of slope (see <br />Figure 13-48-4). A rock underdrain will be constructed in the fill to intercept any <br />ground water, perched water, etc., and safely release it without causing instability [o <br />the structure. According to the stability Calculations, FiBUre 73-6B-b, the resulting <br />factor of safety is 7.90. <br />Again, the emergency spillway for Pond 006 will be shaped and riprapped to its original <br />design configuration. <br /> <br />13.68-9 <br />