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' COARSE-GRAINED SOILS FINE-GRAINED SOILS <br /> LESS THAN 50%FINES- MORE THAN 50%FINES <br /> GROup DESCRIPTION MAJOR GROUP MAJOR <br /> SYMBOLS DIVISIONS SYM9OLS DESCRIPTION DIVISIONS <br />' WELL-GRADED GRAVELS OR GRAVEL- GRAVELS INORGANIC SILTS,VERY FINE SANDS, <br /> GW SAND MIXTURES LESS THAN 5% Morethan half ML ROCK FLOUR SILTY OR CLAYEY FINE <br /> FINES of coarse fraction SANDS <br /> larger than <br /> POORLY-GRADED GRAVELS OR sieve sze INORGANIC CLAYS OF LOW TO AIND <br /> GP GRAVEL-SAND MIXTURES LESS THANCL MEDIUM PLASTICITY, CAN BE CLAYS <br /> 5% FINES GRAVELLY CLAYS, SANDY CLAYS, Liquid limits <br /> SILTY CLAYS, LEAN CLAYS lass than 50 <br /> GM SILTY GRAVELS GRAVEL-SAND-SILT ORGANIC SILTS OR ORGANIC SILT. <br /> MIXTURES MORE THAN 15%FINES OL CLAY MIXTURES OF LOW PLASTICITY <br /> CLAYEY GRAVELS GRAVEL-SAND- INORGANIC SILTS, MICACEOUS OR <br /> GC CLAY MIXTURES MORE THAN 15% MH DIATOMACEOUS FINE SANDS OR <br />' FINES SILTS, ELASTIC SILTS <br /> INORGANIC CLAYS OF HIGH SILTS <br /> SW SANDS, LESS SANDS <br /> FI GRAVELLY CH PLASTICITY, CAN BE GRAVELLY CLAD <br /> SANDS, LESS THAN 5/a FINES CLAYS, SANDY CLAYS, FAT CLAYS qud 6mA <br />' POORLY-GRADED SANDS OR SANDS more than 50 <br /> SP GRAVELLY SANDS LESS THAN 5% More than had OH ORGANIC CLAYS OF MEDIUM TO HIGH <br /> FINES of coarse fracIton PLASTICITY <br /> Es smaller than <br /> SILTY SANDS, SAND-SILT MIXTURES, N 4 <br /> SM sieve <br /> size HIGHLY <br />' MORE THAN 15%FINES PT PEAT MUCK,AND OTHER HIGHLY ORGANIC <br /> SC CLAYEY SANDS SAND-CLAY ORGANIC SOILS SOILS <br /> MIXTURES MORE THAN 15%FINES <br /> NOTE Coarse-grained sods receive dual symbols 4 they contain NOTE Ftne-grained soils may receive dual classification based upon plasticity <br /> 5 to 15%fines(a g SW SM GP Ge etc)(ASTM Standard 0 2488 90) characteristics <br /> SOIL SIZES CONSISTENCY <br />' COMPONENT SIZE RANGE CLAYS&SILTS BLOWS/FOOT- <br /> BOULDERS 12 in <br /> VERY SOFT 0-2 <br /> COBBLES 3 in to 12 in SOFT 2-4 <br /> GRAVEL No 4 to 3 In FIRM 4-8 <br /> Coarse 3/4 in to 3 In STIFF 8-15 <br /> VERY STIFF 16-32 <br /> Fine No 4 to 3/4 in HARD Over 32 <br /> SAND No 200 to No 4 <br /> Coarse No 10 to No 4 RELATIVE DENSITY <br /> Medium No 40 to No 10 <br /> Fine No 200 to No 40 SANDS &GRAVELS BLOWS/FOOT" <br /> I 'Fines(Silt or Clay) No 200 <br /> NOTE Cry sizes smaller than 3 inches are used to classify soils VERY LOOSE 0-4 <br /> LOOSE 4-10 <br /> PLASTICITY OF FINE-GRAINED SOILS MEDIUM DENSE 10-30 <br /> DENSE 30-50 <br /> TERMS DEFINITIONS VERY DENSE Over 50 <br /> Number of blows of 140 pound hammer falling 30 inches to drive a 2 inch <br /> Non-Plastic 1/8-Inch (3-mm)thread can not be roiled O D (1 318 inch ID)split spoon sampler(ASTM Standard D 1586-84) <br />' Low Thread can be roiled once with difficulty MOISTURE CONDITION <br /> Medium Thread can be rolled once or twice <br /> High Thread easy to roll and reknead repeatedly DRY No moisture present,dry to touch <br />' SLIGHTLY DAMP No discernable moisture <br /> DILATANCY DAMP Sufficient moisture present to darken the <br /> DILATANCY I CRITERIA appearance but not adhere to the hand <br /> None No visible change MOIST Adheres to and moistens the hand <br /> Slow Water appears slowly on surface during shaking, VERY MOIST Wets the hand but can not be squeezed out <br /> disappears slowly upon squeezing WET Visible free water Is present <br /> Rapid Water appears quickly during shaking disappears <br /> quickly upon squeezing <br /> Method of Soil Classification Plate C-2 <br /> ATC Associates Inc <br />