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- 1. please help! After drying, a soil is run through a set of sieves with the following percentages passing through each sieve What is the uniformity coefficient? What is the USCS or AASHTO classification of the soil? Solution from graph, D 60 =>10 and D 30 =0.4, C u = >25 C c =1.1 2 /(10*0.4) =<0.3 therefore, as per unified soil classification it can be treated as poorly graded sand opening (mm) sieve %finer by mass 12.7 0.5in 52 4.75 #4 37 2 #10 32 0.841 #20 23 0.42 #40 11 0.25 #60 7 0.149 #100 4