17.6. It is required to design a cantilever retaining wall to retain a 5.0 m high sandy backfill. The consultant suggests the dimensions and soil properties shown in Figure P17.6 and requires that the wall be checked for stability with respect to sliding and overturning based on the active earth pressures determined using a. Coulomb's earth pressure theory (8' = 24°), and b. Rankine's earth pressure theory. The unit weight of the concrete is 24.0 kN/m³. Figure P17.6 k 5.0 m 1.0 m 0.5 m 10° Sand y= 18.5 kN/m³ ' = 36° 0.5 m 1.5 m 1.0 m 1.0 m