2025 06 18 WEH Slope Stability Analysis Letter Report

Color Name Unit Weight (pcf) Color Name Unit Weight Effective Cohesion (psf) 180 (pcf) Bedrock 660 Effective Cohesion (psf) Decomposed 135 180 Bedrock Rock/Very Dense Decomposed 135 Granular Soil 0 Medium sand 0 Rock/Very Dense Granular Soil 120 Medium sand 120 Effective Friction Angle (°) UCS Intact (psf) Intact Rock Parameter mi Geological Strength Index GSI Topsoil 115 115 UCS Intact Rock Intact Parameter (psf)323,263 mi 17 Geological Disturbance Strength Factor D Index GSI 65 1 1 38 323,263 65 1 1 0 38 0 32 17 1 Piezometric Surface 1 32 1 1 1 1 0 0 Piezometric Surface Effective Friction Angle (°) Retaining Retaining Wall Wall 150 150 Topsoil Disturbance Factor D 30 30 640 1 1 1.259 620 NLB-2 NTP-1 Critical Failure Surface (CFS) 600 NTP-2 NLB-1 Factor of Safety: 1.259 Current Slip Surface SurfaceNumbe Number: 401 Current Slip Horz Seismic Coef.: 0.0875 Property Line Elevation 580 560 540 520 500 480 460 440 0 100 200 Distance Cross Section D_Proposed Condition Cr 300 400