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Table 1 - Soil Properties <br /> Description Max dry Saturated Cohesion Internal <br /> density Density (psf) Friction <br /> (pcf) (pcf) Angle <br /> Overburden 110 131 150 22 <br /> Sand and Gravel 110 125 0 35 <br /> Weathered 125 141 100 18 <br /> Bedrock <br /> Stable Bedrock 125 141 2000 20 <br /> Slurry Wall 100 110 0 45 <br /> DESIGN ANALYSIS AND CRITERIA <br /> The proposed mining slopes were analyzed using the XSTABL v5.105a computer <br /> program. XSTABL was designed to analyze the slope stability of earth embankments <br /> subjected to several critical situations that may occur during the life of the embankment. <br /> For this project, four cases were identified as critical during the mining operation. Static <br /> and pseudo-static conditions were analyzed in each case. <br /> Pseudo-static peak acceleration factors were taken from USGS information for the <br /> western United States. The 2% probability of exceedance in 50 years (the most <br /> conservative) was used. <br /> Surface loading equivalent to an HS 20 highway load was applied adjacent to each area <br /> to simulate heavy equipment loading that could be present at that location for <br /> maintenance or construction activities. <br /> All mining side slopes will be 3H:1V. <br /> Case North — North Property Line (NORTH). The mining operation is adjacent <br /> to a private property with a permanent structure near the north property line of <br /> the site. The proposed setback for mining is 50 feet from the property line. The <br /> mining depth was assumed to be 59 feet in this area based on bore log <br /> information in the geotechnical report. <br /> Case South — South Property Line (SOUTH). The mining operation is adjacent <br /> to private property with several permanent structures near south property line of <br /> the site. The mining depth was assumed to be 44 feet in this area based on bore <br /> log information in the geotechnical report. The proposed mining setback was set <br /> 50 feet from the property line <br /> Case East — Existing Balsam Avenue ROW (EAST). The mining operation is <br /> bounded by Balsam Avenue on the east with a 60' ROW. The mining depth was <br /> assumed to be 59 feet in this area based on bore log information in the <br /> Loloff Construction, Inc.-Loloff Pit <br /> J&T Consulting, Inc. Slope Stability APage'2 <br />