2025 06 18 WEH Slope Stability Analysis Letter Report

Color Name Color 660 Unit Weight (pcf) Name Unit Weight (pcf) Bedrock 180 Bedrock Decomposed Rock/Very Dense Decomposed Granular Soil Rock/Very Dense 180 135 135 Effective Cohesion (psf) Effective Cohesion (psf) 0 0 Effective Friction Angle (°) Effective Friction Angle (°) 38 UCS Intact (psf) UCS Intact (psf) 323,263 Intact Rock Parameter mi Intact Rock Parameter mi Geological Strength Index GSI 17 65 323,263 17 Geological Strength Index GSI Disturbance Factor D Disturbance Factor D Piezometric Surface Piezometric Surface 65 1 1 1 1 1 38 1 Granular Soil Medium sand 120 Medium sand 120 Retaining Wall Retaining Wall 150 150 Topsoil Topsoil 115 115 0 0 32 1 32 1 1 1 00 30 640 30 1 1 1.259 Factor of Safety: 1.259 Current SlipSurface SurfaceNumbe Number: 401 Current Slip 620 NLB-2 Horz Seismic Coef.: 0.0875 NTP-1 Critical Failure Surface (CFS) 600 NTP-2 NLB-1 Property Line Elevation 580 560 540 520 500 480 460 440 0 100 200 Distance Cr Cross Section D_Existing Condition 300 400