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TUCSON SOUTH PROPOSED GRAVEL MINE STABILITY ANALYSIS <br /> SLOPE STABILITY ANALYSIS - BRIGHTON RETURN DITCH <br /> TETRA TECH <br /> (Pcf) (PSf) ( ) <br /> 1 Claystone Bedrock Mohr-Coulomb 134 100 28 <br /> (peak strength) <br /> Mud Lens Mohr-Coulomb 126 50 28 <br /> Overburden Mohr-Coulomb 126 50 28 <br /> Sand and Gravel Mohr-Coulomb 137 0 35 <br /> Utility Easement ■ weathered Claystone Mohr-Coulomb 134 0 14 <br /> Bedrock (residual <br /> strength) <br /> 100 ft <br /> Brighton Return Ditch <br /> � 1.32 <br /> 4,975 —41 ft <br /> 4,965 _ <br /> 4.955 <br /> 4,945 <br /> 4,935 ~� <br /> 4,925 <br /> Q) 4,915 <br /> = 4,905 <br /> 4,895 <br /> 4,885 <br /> 4,875 <br /> 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 <br /> Distance (ft) <br /> Figure J-2 - Pseudostatic Analysis with Mine Slope- Lowered Phreatic Surface <br /> Horizontal Acceleration Coefficient: 0.067g <br />