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A. M. ENGINEERING AND TESTING, INC. <br /> KEY TO SOIL CLASSIFICATION <br /> I . CLASSIFICATION OF SOIL CONSTITUENTS BY PARTICLE SIZE * <br /> !GNravelFine <br /> Particle Diameter <br /> than 0. 0029 inch (0.074 mm) (not visible to human <br /> — 0. 0029 inch to 0. 017 inch (0.074 mm to 0.42 nun) <br /> um — 0. 017 inch to 0 .079 inch (0.42 to 2.0 mm) <br /> se — 0.079 inch to 0. 19 inch ( 2. 0 to 4. 75 mm) <br /> — 0. 19 inch to 0. 75 inch <br /> Coarse — 0.75 inch to 3 inches <br /> Cobbles 3 to 12 inches <br /> Boulders Greater than 12 inches <br /> * Unified Soil Classification System (ASTM D 2487-93) <br /> 3 <br /> II . AMOUNT OF MINOR CONSTITUENTS IN SOIL <br /> R <br /> t <br /> f <br /> Content of Minor SOIL Constituents Modifier Content of ORGANIC Components * <br /> (Shell, Silt, etc .)* t <br /> 0% to 5 % Trace 1 % to 2 % <br /> 5 % to 12% Little 2% to 4 % <br /> 12 % to 30% Some 4% to 8 % <br /> 30% to 50% <br /> And Greater than 8 % <br /> * Approximations based on visual, examination of samples and results of laboratory analyses, <br /> if available. <br /> III. CORRELATION OF RELATIVE DENSITY AND CONSISTENCY <br /> WITH STANDARD PENETRATION RESISTANCE N # <br /> AND CONE PENETROMETER RESISTANCE <br /> SANDS and GRAVEL1 <br /> SILTS and CLAYS <br /> Blows / foot Relative Cone Blows / foot Cone <br /> N Density Resistance N Consistency Resistance <br /> (ts ge <br /> (ts <br /> 0 - 4 Ve loose 0 - 15 0 - 2 Vsa soft 0 - 3 <br /> 5 - 10 Loose 20 - 40 <br /> 3 - 4 Soft 4 - 6 <br /> 11 - 20 Firm 40 - 80 5 - 8 Firm 7 - 12 <br /> 21 — 30 Medium dense 85 — 120 9 - 15 Stiff 13 - 25 <br /> 31 - 50 Dense 125 - 200 16 - 30 Verystiff 25 - 50 -` <br /> Over 50 Ve dense Over 200 Over 30 Hard Over 50 <br /> -- <br />