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Holnam, Inc. Terracon <br />ELI Project No. 20945006 <br />indicate the material to have an effective stress internal angle of friction of 32.3 degrees and a <br />total stress internal angle of friction of 34.3 degrees with a cohesion of zero when the material <br />is compacted to approximately 85 percent of Standard Proctor Density ASTM D 698-78. <br />Stability analyses were run using the above data and the PC slope program Versior~ 5.0 developed <br />by GeoSlope Program Ltd. of Calgary, Alberta Canada. The simplified Bishop method and wedge <br />methods of slope stability were utilized and run through the deepest section of the fill. Analyses <br />were run on the anticipated dry state and for a worst case where water would be running through <br />the fill at the bedrock surface. The factor of safety for the slope was determined [o be 1.7 in the <br />dry state and 1.5 in the wet state using the simplified Bishop method. Based on the wedge <br />analysis, the factor of safety in the dry state was determined to be 4,6 and in the saturated state, <br />the factor of safety was calculated to be 3.9. <br />Based on these analyses, it is our opinion the proposed load-out benches will be stable. We <br />further understand that the load-out benches will be vegetated. It is important tl'at the benches <br />be vegetated to minimize erosion. Sloping of the upper bench back toward the ~~phill slope will <br />help direct drainage away from the embankment slope and will further help minirize erosion. It <br />is recommended that adequate drainage be provided to direct surface water around the slope in <br />all areas. <br />J Earthwork: <br />J • General Considerations: The conclusions contained in this report for the proposed <br />J construction are contingent upon compliance with recommendations presented in this <br />1 section, <br />• Site Clearing: Site clearing consists of removing all sandstone and limestcne to the lower <br />~ sandstone tense at the base of the quarry. <br />• Excavation: Excavation of the bedrock requires blasting. Blasting is currently being used <br />to break up and remove the overburden and to quarry the limestone. <br />J Placement and Compaction: <br />1 . Place and compact fill in horizontal lifts, using equipment and procedures that will <br />~ produce recommended densities throughout the lift. <br />2. Uncompacted fill lifts should not exceed 2 feet in loose thickness. <br />4 <br />