A sample of soil was tested in the laboratory and the following grain size analysis results were obtained: Atterberg limits on minus No. 40 material were: LL = 36, PL = 14. Determine the USCS classification symbol for this soil. Extra credit - determine the full AASHTO classification for this soil (symbol plus group index).

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Sieve No. Sieve Opening (mm) Percent Finer by Weight 100 4 4.75 10 2.00 100 0.85 20 100 0.425 40 94 60 0.25 82 100 0.15 66 200 0.075 45 Pan