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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS TYPICAL <br /> GRAPH I LETTER DESCRIPTIONS <br /> 0 <br /> CLEAN WELL GRADED GRAVELS GRAVEL <br /> GRAVEL GRAVELS oO oQC FSAND NfSMIXTURE5 LITTLE OR NO <br /> G W <br /> AND <br /> GRAVELLY .'. POORLY GRADED GRAVELS <br /> SOILS (LITTLE OR NO FINES) ��� GP GRAVEL SAND MIXTURES LITTLE <br /> OR NO FINES <br /> COARSE <br /> GRAINED GRAVELS WITH ®M SILTY GRAVELS GRAVEL SAND <br /> SOILS MORE THAN 50% FINES SILT MIXTURES <br /> OF COARSE <br /> FRACTION <br /> RETAINED ON NO <br /> 4 SIEVE (APPRECIABLE CLAYEY GRAVELS GRAVEL SAND <br /> AMOUNT OF FINES) GC CLAY MIXTURES <br /> •:i=... <br /> �;:::: WELL GRADED SANDS GRAVELLY <br /> MORE THAN 50% <br /> SAND CLEAN SANDS SW SANDS LITTLE OR NO FINES <br /> .:.. <br /> OF MATERIAL IS AND <br /> LARGER THAN SANDY <br /> NO 200 SIEVE SOILS POORLY b SANDS <br /> I SIZE [LITTLE OR NO FINES) SP GRAVELLY <br /> SAND LITTLE OR NO <br /> FINES <br /> SANDS WITH SILTY SANDS SAND SILT <br /> OF COARSE <br /> MORE THAN 50% FINES SM MIXTURES <br /> . FRACTION <br /> PASSING ON NO <br /> 4 SIEVE (APPRECIABLES.L. 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 /> III I SILTS WITH SLIGHT PLASTICITY <br /> SILTS INORGANIC CLAYS OF LOW TO <br /> FINELIQUID LIMIT MEDIUM PLAS71CiTY GRAVELLY <br /> GRAINED AND LESS THAN 50 CL CLAYS SANDY CLAYS SILTY CLAYS <br /> CLAYS LEAN CLAYS <br /> SOILS _ _ <br /> OL ORGANIC SILTS AND ORGANIC SILTY <br /> CLAYS OF LOW PLASTICITY <br />' MORE THAN 50% INORGANIC SILTS MICACEOUS OR <br /> OF MATERIAL IS MH DIATOMACEOUS FINE SAND OR <br /> SMALLER THAN SILTY SOILS <br /> NO 2o0 SIEVE <br /> SIZE SILTS <br />' <br /> AND LIQUID LIMIT INORGANIC CLAYS OF HIGH <br /> GREATER THAN 5o CH PLASTICITY <br /> CLAYS CLAYS <br /> pFIGAMC CLAYS OF MEDIUM TO <br /> QH HIGH PLASTICITY ORGANIC SILTS <br /> HIGHLY ORGANIC SOILS PT <br /> AT 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/V 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&Cla Below No 200 Below 0 074 <br /> SECOR <br /> Internam!Incorporated <br />