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Table 1 -Soil Properties Description Maa dry density (pct) Saturated Density (pct) Cohesion (pst) Internal Friction Mgle Overburden 110 131.7 150 20 Sand and Gravel 125 141.1 0 32 Weathered Bedrock 130 144.2 50 16 Stable Bedrock 130 144.2 500 45 Slurry Wall 95 122.2 200 18 DESIGN ANALYSIS AND CRITERIA The proposed mining slopes were analyzed using the XSTABL v5.206 computer program. XSTABL was designed to analyze the slope stability of earth embankments subjected to several critical situations that may occur during the life of the embankment. For this project, six cases were identified as critical during the mining operation. Case 1 - 104'h Avenue. The south permit boundary line of the site is adjacent to 104'h Avenue. An HS-20 loading with a 1.3 factor for impact was used to simulate the traffic loads for this case. The proposed setback for mining is 45 feet from the right-of--way line or approximately 85 feet from the roadway centerline. There aze also several existing utilities and fences that pazallel the highway within the right-of--way. The mining depth was assumed to be 29 feet in this azea based on bore log information provided by Aggregate Industries -WCR, Inc. The mining side slope in this location will be near vertical. Case 2 -Adjacent Buildings. The mining operation is adjacent to existing buildings along a portion of the south pennit boundary. The mining depth was assumed to be 29 feet in this area based on bore log information provided by Aggregate Industries -WCR, Inc. A conservative 3000 psf load was used to simulate the building foundation loads for this case. The most critical building is located approximately 5 feet from the property line. The proposed mining setback was set 55 feet from the property line, allowing a 60 foot setback from the nearest building. The mining side slope in this location will be near vertical. Case 3 -Fulton Ditch and Bull Seep Realignment. The mining operation is adjacent to the Fulton Ditch on the east side. The Bull Seep, which currently runs across the property, will be relocated along this east side of the pit. The mining depth was assumed to be 30 feet in this area based on, bore log information provided by Aggregate Industries -WCR, Inc. It was assumed that the slurry wall would be located 35 feet east of the mining limits and the edge of Bull Seep would be and additional 10 feet east of the slurry wali. The Bull Seep will be reconstructed 25 feet wide. The centerline was assumed to lie 27.5 feet west of the property line. The proposed mining setback was set 85 feet from the property line. The Fulton Ditch is located an additional 22 feet east of the property line and will