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 D Date: 12/2/25 Soil Description: Topsoil PARAMETERS cohesion, c= 100 psf Friction Angle, 6 = 30 deg Wt. S0ilans Ye = 115 pet FS. = F/Fa= (d (1, - 62.4)Cos” i Tan $ + ¢) /(d y, Sin i Cos i) FACTOR OF SAFETY, FS. Assumes full soil saturation to ground surface (Critical Slope Radians, i (deg) 0.32 [Critical Slope Angle, i (deg) 18.43 FS for Critical Slope Ratio (horiz.:vert.) Depth, d (ft) 3H:1V 0.5 6.59 1 3.69 2 2.24 LANGAN