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ENCLOSURE B <br /> UNIFIED SOIL CLASSIFICATION SYSTEM CHART <br /> Major Divisions Group Typical <br /> Symbols Names <br /> (D � Well—graded gravels and gravel—sand <br /> o p GW ;. mixtures, little or no fines. <br /> oU C: IV <br /> U �OJI Poorly graded gravels and gravel—sand <br /> o C'P mixtures, little or no fines. <br /> N O y C <br /> r� z �, o�, ci s (n ISM Silty gravels, gravel—sand—silt mixtures. <br /> GC Clayey gravels, gravel—sand—clay mixtures. <br /> L � <br /> 'o (n SW Well—graded sands and gravelly sands, little <br /> or no fines. <br /> O o o�U� U (� SP Poorly graded sands and gravelly sands, <br /> 0 toU �CD U_ o little or no fines. <br /> a o a N z — <br /> �- � `a V) SM Silty sands, sand—silt mixtures. <br /> v V 'W+ C C <br /> 06 <br /> CL SC Clayey sands, sand—clay mixtures. <br /> °! - n ML Inorganic silts, very fine sands, rock flour, <br /> :� silty or clayey fine sands. <br /> `2 Inorganic clays of low to medium plasticity, <br /> N ¢ �O CL gravelly clays, sandy clays, silty clays, lean clays. <br /> tf I "_y:~ Organic silts and organic silty clays of low <br /> to `n OL ti• ..ti plasticity. <br /> M H �� Inorganic silts, micaceous or diatomaceous <br /> 0- av E a� fine sands or silts, elastic silts. <br /> U_ _c a CH Inorganic clays of high plasticity, fat clays. <br /> Q '- >< p <br /> C) --' OH Organic clays of medium to high plasticity. <br /> Highly Organic Soils PTPeat, muck and other highly organic soils. <br /> ■ Based an The Material Passing The 3-Inch (75-mrn) Sieve. <br /> Relative Density Consistency <br /> Additional Fill Patterns <br /> Sands, Gravels, And Blows/Foot * Clays And Strength *= Blows Foot <br /> Road Base/ <br /> Non—Plastic Silts Plastic Silts g <br /> Asphalt Very Loose O 4 <br /> Very soft D - 1/4 0 _ 2 <br /> '•'='-'" - <br /> v Soft 1/4 - 1/2 2 - 4 <br /> c4_c Loose a - 10 <br /> 'p.ad Concrete 30 <br /> Medium Dense 10 Firm 1/2 — t 4 — 8 <br /> — <br /> O. 'O Dense 30 — 50 Stiff 1 — 2 $ — 16 <br /> o <br /> O:•:O:.;.o _. Backfill Very Dense Over 50 Very Stiff 2 - 4 16 - 32 <br />+. ® <br /> Cement Hard Over 4 Over 32 <br /> • Number of 61ows o! 1 W pound hammer Fallingg 30 inches to drive a 2 inch <br /> Q.O. (1-3/8 inch 1•D.) split spoon (ASTM D-1588). <br /> •• Unconfined compressive strength in tons/sq. ft. as determined by laboratory <br /> testing or approximated by the standard penetration test (ASTM 0-1385), <br /> pocket penetrometer• torvane. or visual obaervction. <br />