2025 06 18 WEH Slope Stability Analysis Letter Report

Color Name Unit Weight (pcf) Color Name Unit Weight Bedrock Effective Cohesion (psf) 180 (pcf) Decomposed 135 180 Bedrock Rock/Very Dense Granular Soil Decomposed 135 660 Effective Cohesion (psf) Rock/Very Dense Granular Soil Medium sand 120 Medium sand 150 Topsoil 115 115 Topsoil Effective Friction Angle (°) 38 0 38 0 32 0 120 Retaining Wall Retaining Wall 0 Effective Friction Angle (°) UCS Intact (psf) Intact Rock Parameter mi Geological Strength Index GSI Disturbance Factor D UCS Intact Rock Intact Parameter 17 (psf)323,263 mi Geological Disturbance Strength Factor D Index GSI 65 Piezometric Surface 323,263 65 1 17 1 1 1 32 1 1 1 1 30 30 640 1 1 150 00 Piezometric Surface 1 1 1.589 620 Factor of Safety: 1.589 Current Slip Surface Number: 401 NLB-2 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 Cross Section D_Existing Condition Cr 300 400