2025 06 18 WEH Slope Stability Analysis Letter Report

Color 690 Name Unit Weight (pcf) Effective Cohesion (psf) Effective Friction Angle (°) Bedrock 180 Decomposed Rock/Very Dense Granular Soil 135 0 38 Dense to Very Dens Sand 125 0 34 Medium sand 120 0 32 Top soil 115 0 30 UCS Intact (psf) Intact Rock Geological Parameter Strength mi Index GSI Disturbance Factor D Piezometric Surface 323,263 17 1 1 65 1 4.594 Criticalsurface Failure Failure Surface (CFS) 640 Factor of Safety: 4.594 Current Slip Surface Number: 217 Horz Seismic Coef.: 0.0875 TP-7 TP-4 LB-3 B-13 TP-14 590 TP-5 Approximate Projected Location of Existing Building LB-4 540 TP-6 Elevation 490 440 390 340 290 240 190 0 100 200 300 400 500 600 700 Distance Cross Section B_Existing Condition 800 900 1,000 1,100 1,200