A 500 mm diameter closed-end steel pipe pile is to be driven to a depth of 17 m into the following soil profile. Depth (m) 0-2.0 2.0-6.5 6.5 16.0 16.0 17.5 Soil Classification Silty sand Fine to medium sand Silty sand Well graded sand Unit Weidth, y (kN/m) 19.0 19.5 19.1 19.8 Friction angle, o' () 28 31 29 35 No predrilling or jetting is to be used. The groundwater table is at a depth of 5.5 m. Compute the toe bearing capacity, qnA (Assume E = 36, 124 kPa, and v= 0.25) OCR 4.5 3.5 2.5 1.5