A drilled-shaft foundation is to be constructed in clay soil having the following properties. From zero to $30 \mathrm{fl}$ depth, the cohesion is 1,000 paf and the soil unit weight is 105 pef; below $30 \mathrm{ft}$, the cohesion is $2,500 \mathrm{psf}$ and the unit weight is $115 \mathrm{pcf}$. The foundation is to exiend to a toxal depeh of $36 \mathrm{ft}$. A 3-ft-diameter shaft will be used with a belled (under-reamed) bottom $6 \mathrm{ft}$ in diameter. Assume that the bell forms a $60^{\circ}$ angle with the horizontal plane. Compute the design downward capacity using the empirical design nethod shown in Table 14.