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UNIFIED S01L CLaSSiFICATION SYSTEM MAJOR DIVISIONS ISYMBCL.Si TYPICAL NAMES G11V °i 'Nell graded grovels or gravel-sand mixtures, little or no fines GRAVELS JN GP o .C:I Poorly graded gravels or gravel-sand mixtures,little or no fines ON w MORE THAN 1/2 OF GM Siity-grovels, grovel-sand-silt mixtures p cn COARSE FRACTION> W o NQ 4 SIEVE SIZE Z_ cli g GC Clayey gravels, gravel-sand-clay mixtures < g 0 ^ SW Well graded sands or gravelly sands, little or no fines W o SANDS CA SP Poorly graded sands or gravelly sands, little or no fines < a: "' MORE THAN 1/2 OF a SM Silty sands, sand-silt mixtures COARSE FRACTION< NO. 4 SIEVE SIZE SIC Clayey sands, sand-clay mixtures Inorganic silts and very fine sands, rock flour, silty or clayey Cn nWi MI— I I fine sands or clayey silts with slight plasticity _� N SILTS a CLAYS O wInorganic clays of low to medium plasticity, gravelly clays, Cn d CL sandy clays, silty clays, lean clays pN LL<50 Ijl Z o OL I I I Organic silts and organic silty clays of low plasticity N < z MH I I Inorganic silts, micaceous ordiatomoceaus fine sandy or silty (D soils, elastic silts a SILTS 8 CLAYS z o CH Inorganic clays of high plasticity, fat clays U_ w LL>50 ON jx Organic clays of medium to high plasticity,organic silty clays, D �iI/ organic silts HIGHLY ORGANIC SCILS I Pt Peat and other highly organic soils CLASSIFICATICN CHART RANGE OF GRAIN SIZES CLASSIFICATION U.S. Standard Grain Size Sieve Size In Millimeters BOULDERS Above 12" Above 305 r------� COBBLES 12" to 3" 305 to 76.2 Ill =! CX) < W 00 GRAVEL 3" to No.4 76.2 to 4.76 COARSE 3"to 3i4" 76.2 to 19.1 O ¢ w t— n FINE 3/4"to No.4 19.1 to 4.76 � C`Zl Z � _ W 1— SAND No.4 to No.200 4.76 to 0.074 0 tr COARSE No.4 to No.10 4.76 to 2.00 � MEDIUM No.10 to No.40 2.00 to 0.420 `Z FINE No.40 to No.200 0.420 to 0.074 AJ SILT a CLAY I Below No.200 I Below NO-0-074 GRAIN SIZE CHART GROUNDWATER TECHNOLOGY