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Q.4 (a) A structure situated on a layer of saturated soil with an impervious stratum underneath is shown in Figure Q.4(a). The coefficient of permeability of the soil is 1 x 10 m/s. 9 m Structure Water table A 4 m 4 m 7 m Datum Water table B B 9 m XP o* Ysat = 21 kN/m Impermeable stratum Figure Q.4(a) Determine: (1) the elevation head, pressure head and total head of Points A and B, as well as the direction of the seepage between Points A and B; (7 marks) (i) the quantity of seepage flowing under the structure (m²/s per unit width of the structure); (2 marks) (iii) the total head at Point P and pressure head at Point Q; and (3 marks) (iv) the total stress, pore water pressure and effective stress at Point Q(given the saturated unit weight of the soil is 21 kN/m?). (4 marks)