An area of planned construction is underlain by sandy soil where the angle of internal friction is 35°. (a) What is the maximum safe slope angle for this soil if there is no groundwater flow? (b) If...

An area of planned construction is underlain by sandy soil where the angle of internal friction is 35°.

(a) What is the maximum safe slope angle for this soil if there is no groundwater flow?

(b) If it is assumed that groundwater flow could occur through the slope, approximately what slope angle should be considered as the allowable maximum?