2025 06 18 WEH Slope Stability Analysis Letter Report

Color 660 Name Unit Weight (pcf) Effective Cohesion (psf) Effective Friction Angle (°) UCS Intact (psf) Intact Rock Parameter mi Bedrock 180 Decomposed Rock/Very Dense Granular Soil 135 0 38 1 Dense to Very Dense Sand 125 0 34 1 Medium sand 120 0 32 1 Topsoil 115 0 30 1 323,263 17 Geological Strength Index GSI Disturbance Factor D Piezometric Surface 65 1 1 640 1.473 620 Factor of Safety: 1.473 Current Slip Surface Number: 396 Current Slip Surface Numbe NLB-4 600 Horz Seismic Coef.: 0.0875 Critical Failure Surface (CFS) R-4B 580 Elevation NLB-3 560 Property Line 540 520 500 480 460 440 0 100 200 Distance Cross Section D_Existing Condition 300 400

Color 660 Name Unit Weight (pcf) Effective Cohesion (psf) Effective Friction Angle (°) UCS Intact (psf) Intact Rock Geological Parameter Strength mi Index GSI Disturbance Factor D 323,263 17 1 65 Piezometric Surface Bedrock 180 Decomposed Rock/Very Dense Granular Soil 135 0 38 1 1 Dense to Very Dense Sand 125 0 34 1 Medium sand 120 0 32 1 Topsoil 115 0 30 1 640 1.473 Proposed Building 620 Factor of Safety: 1.473 Current Surface Current Slip Slip Surface Numbe Number: 396 NLB-4 600 Horz Seismic Coef.: 0.0875 Critical Failure Surface (CFS) R-4B 580 Elevation NLB-3 560 Property Line 540 520 500 480 460 440 0 100 200 Distance Cross Section D_Proposed Condition 300 400