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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS TYPICAL <br /> GRAPH LETTER DESCRIPTIONS <br /> 0 <br /> CLEAN '�' °�FFS <br /> LL GRADED GRAVELS GRAVEL <br /> GRAVEL GRAVELS QO�BSAND ES MIXTURES LITTLE OR NO <br /> AND <br /> GRAVELLY • <br /> SOILS ORLY GRADED GRAVELS <br /> (LITTLE OR NO FINES) �•rAVEL SAND MIXTURES LITTLE <br /> PA. <br /> •a NO FINES <br /> COARSE <br /> GRAINED GRAVELS WITH ° TY GRAVELS GRAVEL SAND <br /> SOILS MORE THAN 50% FINES T MIXTURES <br /> OF COARSE <br /> FRACTION <br /> RETAINED ON NO <br /> 4 SIEVE (APPRECIABLEYEY GRAVELS GRAVEL SAND <br /> AMOUNT OF FINES) Y MIXTURES <br /> CLEAN SANDSLL GRADED SANDS GRAVELLY <br /> MORETHAN50% SAND DS LITTLE OR NO FINES <br /> OF MATERIAL IS AND <br /> LARGER THAN SANDY <br /> NO 200 SIEVE SOILSPOORLY GRADED SANDS <br /> SIZE (LITTLE OR NO FINES) S P GRAVELLY SAND LITTLE OR NO <br /> FINES <br /> SANDS WITHSILTY SANDS SAND SILT <br /> MORE THAN 50% <br /> OF COARSE FINES `SM MIXTURES <br /> FRACTION <br /> PASSING ON NO <br /> 4 SIEVE (APPRECIABLECLAYEY SANDS SAND CLAY <br /> • AMOUNT OF FINES) SC MxTURES <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 /> FINE AND LIQUID LIMIT MEDIUM PLASTICITY GRAVELLY <br /> GRAINEDCLAYS LESS THAN SO CL CLAYS SANDY CLAYS SILTY CLAYS <br /> SOILS —— — LEAN CLAYS <br /> OLI ORGANIC SILTS AND ORGANIC SILTY <br /> —— — CLAYS OF LOW PLASTICITY <br /> MORE THAN 50% 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 L10U:D LIMIT INORGANIC CLAYS OF HIGH <br /> CLAYS GREATER THAN 50 CH PLASTICITY <br /> /�fjf%ffj/�fjfff <br /> l//fj/jf/ffj 0 H ORGANIC CLAYS OF MEDIUM TO <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 3�4" 76 2 to 4 76 <br /> Fine 3�4"to No 4 19 1 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&Clay- Below No 200 Below 0 074 <br /> SECOR <br /> InternwwnW Incorporated <br />