2. A one-story building is to be supported by spread footings on a soil profile shown below. The profile is obtained by soil exploration done to a depth of 9 m, using a rotary drill. SPT is done at every 1.0 m and the field N values are corrected to N60. (a) Is this exploration depth sufficient for analyzing the foundation-soil interaction of the proposed building? (5%) (b) Correct the N60 values to (N1)60 and determine the  (angle of internal friction) of sand. (10%) (c) Find Es (stiffness modulus) and predict elastic settlement within a time span of 10 years. (15%) (d) Determine whether the clay is normally consolidated (NC) or over-consolidated (OC). (5%) (e) Predict the total settlement and state if safe provided the tolerable limit is 25 mm (You may use 2:1 Method for  determination. Cc=0.009 (LL-10) and if required take Cr= 1/10 Cc) (15%) (f) Determine the allowable bearing capacity using Terzaghi's equation. Is the selected footing size safe? (15%)