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~~ <br />Detailed results of monitoring at individual locations and <br />our recommendations are presented in the following sections. <br />3.0 CRUSHING AND SCREENING LEVEL FILL (ZONE 1-A) <br /> <br />E~ <br />3.1 Monitoring Results <br />The two inclinometers and piezometers installed in this <br />fill show that quite different types of deformation are <br />occurring. Inclinometer I-2 is installed at the west end of the <br />fill, where the fill surface is essentially horizontal with no <br />significant surface loads. Subsurface deflections are irregular <br />and of limited magnitude. Maximum subsurface cross slope <br />deflection of 0.61 inches exceeds the maxiumum subsurface down- <br />slope deflection of 0.39 inches. Upslope movement of the <br />inclinometer casing is indicated in the lower half of the <br />boring. These data indicate that the fill is basically stable. <br />The measured deflections are probably caused by settlement of <br />the fill, which was apparently placed with minimal compaction, <br />and settlement of the sand pack around the inclinometer casing. <br />Inclinometer I-1, located at the east end of the fill <br />immediately adjacent to the coal stockpile, shows much larger <br />deformations. Downslope deformations are indicated at all <br />elevations within the fill. Between the original ground surface <br />and a depth of 30 feet below the surface of the bench there is <br />a gradual downslope,movement.suggesting gradual and uniform <br />downslope creep within the fill. A sudden increase in <br />downslope displacements occurs above a depth of 30 feet. The <br />downslope movements may be related to the occasional presence <br />of the coal stockpile and the construction of a berm at the <br />crest of the fill at this location. They have occurred <br />relatively uniformly since monitoring was commenced, with <br />maximum downslope displacements typically being between 0.25 <br />and 0.5 inches per month. Cross slope movements are generally <br />small and irregular. <br />No significant water pressures have been measured within <br />the fill at either location. <br />3.2 Impact on Reclamation <br />It is proposed to reclaim the Crushing and Screening Level <br />Fill (Zone 1-A) by flattening the existing slope, which is at <br />an angle of 35 to 37 degzees, or very close to the angle of <br />repose. Reclaimed slopes will be constructed at 2(H) 1(V). <br />A 25 foot wide terrace will be included in the reclaimed con- <br />figuration, which will reduce the overall reclaimed slope <br />angle. Our stability analyses indicate that adequate safety <br />factors will result from this configuration. All structures and <br />stockpiles will be removed from the surface of the fill as a <br />ccaHrawca+w~new.wc. <br />