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O TETRA TECH Updated Tucson South Proposed Gravel Mine Slope Stability Analysis <br /> November 8 2019 <br /> ObjectMine Slope Reclamation Slope Highwall <br /> Model Factor of Safety Setback Factor of Safety Setback Factor of Safety <br /> Static seismic Static Seismic Static Seismic Setback(ft) <br /> A-Tucson St.West Power Pole 1.68 1.31 35 1.64 1.34 44 1.76 1.30 110 Power Pole <br /> B-Tucson St.East 2.17 1.67 35 1.91 1.49 35 1.71 1.41 65 Edge of ROW <br /> C-South Platte River 2.13 1.63 44 1.89 1.46 44 1.87 1.32 120 Edge of Riverbank <br /> D-Pipeline 2.09 1.65 35 1.73 1.37 35 1.86 1.33 175 Pipeline easement <br /> E-Fence near gas well 2.08 1.49 56 2.10 1.52 56 1.72 1.31 65 Gas Well <br /> F-Power Pole (1)' 1.89 1.41 68 1.75 1.39 100 Power Pole <br /> G-Brighton Ditch (1)' 1.93 1.53 35 1.69 1.38 90 Affected Land Boundary <br /> H-Highway 7 North 2.00 1.56 35 1.77 1.38 35 1.81 1.32 105 Power Pole <br /> 1-Highway 7 South 2.31 1.67 86 2.72 1.86 86 1.63 1.33 90 Power Pole(assume 20'offset from toe of berm)*2:1 mine slope with dewatered pit <br /> J-Brighton Return Ditch 1.58 1.32 51 1.81 1.35 51 1.68 1.32 105 Brighton Ditch Easement Boundary*2:1 mine slope with lowered phreatic surface <br /> K-South Cell Gravel Road 2.19 1.53 30 2.59 1.75 30 1.67 1.32 75 Edge of Waterline Easement*2:1 mine slope with dewatered pit <br /> L-Challenger Pit 2.24 1.75 45 1.97 1.52 45 1.81 1.34 185 Edge of utility easements <br /> M-East Cell Pipeline 2.37 1.76 52 2.22 1.66 52 2.08 1.53 120 Todd Creek Pipeline easement <br /> N-Highway 7 northwest 3.13 2.19 106 3.07 2.16 106 1.93 1.37 110 Power Pole(assume screening berm between mine and pole) <br /> 0-City of Aurora Pipeline 2.76 1.88 72 2.61 1.79 72 1.90 1.37 80 City water line(assume screening berm between mine and waterline) <br /> (1)-Existing geometry prevents a mine slope from being cut at a 3HA V <br />