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171Group EfficiencyAggregate Pier Group of Four 305mm piers at Ultimate Load level (Table 19)Group Efficiency = Total Load on the pier Group / (Load on the Isolated Pier x Number ofPiers in the Group) = 2,254kPa / (406kPa x 4) = 2.1Ultimate load for groups of piersAggragte Pier Group of Two 305mm piers (Table 20)q g = qR s / (R s R a – R a + 1) = 2,400kPa x 1.5 / (1.5 x 0.061 – 0.061 + 1) = 3,490kPaq m = q g /R s = 3,475kPa / 1.5 = 2,316kPaQ = Q g + Q m = q g A g + q m A m = 3,490kPa x 0.0091m 2 + 2,316kPa x 0.1399m 2 = 355x10 3 kN