O38 Email from Nov 13 2025 to Dec 9 2025 between Mr Kleinberg and Mr Seele

SURFICIAL SLOPE STABILITY Project: WEHI Project No.: 101049801 Location: Cross Section C Date: 12/2/25 FS. = FF, = (d (7, - 62.4)Cos” i Tan ¢ +c)/ (dy, Sin i Cos i) EACTOR OF SAFETY, FS Assumes full soil saturation to ground surface (Critical Slope Radians, i (deg) 0.41 (Critical Slope Angle, i (deg) 23.50 FS for Critical Slope Ratio (horiz.:vert.) Soil Description: Topsoil PARAMETERS (cohesion, o= 75 pst Friction Angle, 6= 30 deg wt. SOiljan, Ys= 115 pet Depth, d (ft) 23H:1V 0.5 417 1 239 2 1.50 LANGAN