How do you solve and what are the formulas? MTC/MTO Soil Classifications http://tinyurl.com/k7gkbl 

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The calculations for soil classification are made using the Coefficient of Uniformity C(u), the coefficient of curvature C(c), where D represents the various grain-size diameters "passing on the cumulative grain-size curve," for example D(10), D(30) and D(60).

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