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r� <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS I TYPICAL <br /> GRAPH LEITER DESCRIPTIONS <br /> 4 <br /> CLEAN �`0� WELL-0RAD <br /> O RAIDED GRAVELS GRAVEL- <br /> GRAVEL GRAVELS O0:3 0 OW SANDSMIXTURES LITTLE OR NO <br /> AND o <br /> GRAVELLY • <br /> SOILS •'• •�` POORLY GRADED GRAVELS <br /> (LITTLE OR NO FINES) , QP GRAVEL SAND MIXTURES LITTLE <br /> �.•e OR NO FINES <br /> COARSE <br /> GRAINED GRAVELS WITHSILTY GRAVELS GRAVEL SAND <br /> SOILS MORE co � RNES aM SILT MIXTURES <br /> OF FRACTION <br /> RETAINED ON NO <br /> 4 SIEVE (APPRECIABLE GC CLAYEY GRAVELS GRAVEL SAND <br /> AMOUNT OF FINES) CLAY MIXTURES <br /> CLEAN SANDS WELL-GRADED SANDS GRAVELLY <br /> MORE THAN 50% SAND CLEAN SANDS LITTLE OR NO FINES <br /> OF MATERIAL IS AND <br /> LARGER THAN SANDY <br /> NO 200SIEVE SOILS POORLY-0 RADED SANDS <br /> SIZE (LITTLE OR NO FINES) SP GRAVELLY SAND LITTLE OR NO <br /> FINES <br /> SANDS WITHSILTY SANDS SAND SILT <br /> MORE THAN 50% FIN ES `S M MIXTURES <br /> OF COARSE <br /> FRACTION <br /> PASSING ON NO <br /> 4 SIEVE (APPRECIABLE S.G. CLAYEY SANDS SAND CLAY <br /> AMOUNT OF FINES) MIXTURES <br /> INORGANIC SILTS AND VERY FINE <br /> ML SANDS ROCK FLOUR SILTY OR <br /> CLAYEY FINE SANDS OR CLAYEY <br /> SILTS WITH SLIGHT PLASTICITY <br /> SILTS INORGANIC CLAYS OF LOW TO <br /> FINEAND LIQUID LIMIT G.� MEDIUM PLASTICITY GRAVELLY <br /> . GRAINED CLAYS LESS THAN 50 —— — AVS SANDY CLAYS SILTY CLAYS <br /> LE <br /> SOILS LEAN CLAYS <br /> OL ORGANIC SILTS AND ORGANIC SILTY <br /> ——— CLAYS OF LOW PLASTICITY <br /> MORE THAN So% INORGANIC SILTS MICACEOUS OR <br /> OF MATERIAL IS <br /> SMALLER THAN MH DIATOMACEOUS FINE SAND OR NO 200 SIEVE SILTY SOILS <br /> SIZE <br /> SILTS <br /> AND LIQUID LIMrT CH PLASTICITY CLAYS OF HIGH <br /> CLAYS GREATER THAN 50 PLASTICITY <br /> ORGANIC CLAYS OF MEDI UM TO <br /> OH <br /> HIGH PLASTICITY ORGANIC SILTS <br /> HIGHLY ORGANIC SOILS PT PEAT HUMUS SWAMP SOILS WITH <br /> HIGH ORGANIC CONTENTS <br /> NOTE DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS <br /> GRAIN SIZE CHART SAMPLE DESIGNATION <br /> Classification Range of Grain Sizes <br /> US Standard Grain Size Recovery <br /> Sieve Size in Millimeters <br /> Boulders Above 12" Above 305 Continuous Core Sample Interval <br /> Cobbles 12"to 3" 305 to 76 2 Drive Sample Interval <br /> Gravel 3"to No 4 76 2 to 7 76 NR No Recovery <br /> Coarse 3"to 74" 76 2 to 4 76 <br /> Fine s/4"to No 4 191 to 4 76 ND Not Detected <br /> Sand No 4 to No 200 4 76 to 0 074 Q First Water(bgs) <br /> Coarse No 4 to No 10 4 76 to 2 00 <br /> Medium No 10 to No 40 2 00 to 0 420 = Stabilized Water Level (bgs) <br /> Fine No 40 to No 200 0 420 to 0 074 <br /> Silt&Cfa Below No 200 Below 0 074 <br /> SECOR <br /> Ineernatwreal Ineorpomted <br />