Check for Stability:
Assuming coefficient of friction μ = 0.6
W = 345 (a + b) = 345 (17 + 5.2) = 7659 kN
∴ μ W = 0.6 × 7659 = 4595.4 kN
P = 4205 kN/m2
∴ Factor of safety against sliding
= 4595.4/4205 = 1.09 > 1
and factor of safety against overturning
= W (e + b/2)/ P ⋅ h/3 = 7659 (0.143 + 0.5) × 17/(4205 × 29/3) = 2.06 > 1 ∴ OK.