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LFR Inc. <br /> Generally, it was concluded that a 1H:1V slope 85 feet high would be more stable than <br /> the existing slope (pre-remediation) and of similar stability to the-surrounding slopes. It <br /> was recommended that the final slope be 1H:1 V and no more than 85 feet high, since <br /> this slope would have a minimum <br /> factor of safety between 1.2 and 1.4 ` t <br /> A 40-foot-high buttress (60 feet <br /> from the top of the slope) at 2H:IV <br /> was constructed to match the y <br /> stability of the surrounding slopes. <br /> Jute matting was installed on top of <br /> the cut slope to provide temporary <br /> limited protection against erosion on <br /> the final slope. <br /> 5.6.2 Excavation Summary <br /> Slope excavation to remove the Photograph 13 <br /> pyrolytic oil-affected soil that Initial embankment removal activities <br /> extended beneath the embankment <br /> was conducted by SCI from March <br /> 27 through April 21, 2006. Initially, SCI used an excavator and dozer (Photograph 13) <br /> to push soil off the edge from the top of the embankment to the floor of the pit where <br /> the unaffected soil was harvested by loaders for later use. The next day, in addition to <br /> the use of an excavator and dozer, SCI used the dozer with a slope board attachment on <br /> the front blade to cut a 1H:1V slope into the embankment. A ramp was constructed <br /> from the top slope to the bottom, across the embankment at a slight grade, which <br /> allowed scrapers to drive a loop pattern, picking up the soil from the slope and <br /> dropping it at the base. Eventually <br /> the excavator, bulldozer, and <br /> scrapers worked the slope, from the <br /> top to the base, leaving a 1 H:1 V cut- <br /> slope of unaffected soil (Photograph <br /> 14). <br /> During the week of April 10, 2006, <br /> SCI encountered the pyrolytic oil- ' <br /> affected soil near the bottom of the <br /> 4.~ r " "• <br /> excavation area, approximately 10 .--�� .., " ' <br /> feet above the water table. The last ;. <br /> of the pyrolytic oil-affected soil was <br /> removed on April 14, 2006 (from a <br /> depth of 5 feet below the water Photograph 14 <br /> table). The pyrolytic oil-affected soil Heavy equipment continuing embankment <br /> was stockpiled separately from the removal <br /> unaffected soil for loading, <br /> transport, and disposal to a licensed Class II landfill. <br /> Page 30 rpt-RA_sunun-Nov06-final-09025:FNC <br />