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Table 1 - Soil Properties <br />Description <br />Max dry <br />density <br />c <br />Saturated <br />Density <br />c <br />Cohesion <br />(psf) <br />Internal <br />Friction <br />Angle <br />Overburden <br />110 <br />131 <br />150 <br />22 <br />Sand and Gravel <br />110 <br />125 <br />0 <br />35 <br />Weathered <br />Bedrock <br />125 <br />141 <br />100 <br />18 <br />Stable Bedrock <br />1 125 <br />1 141 <br />1 2000 <br />20 <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:1 V. <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 />geotechnical report. The proposed mining setback was set 50 feet from the <br />ROW. <br />- Loloff Construction, Inc. - Loloff Pit <br />0' J&T Consulting, Inc. Slope Stability Analysis <br />Page 2 <br />