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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS TYPICAL <br /> GRAPH LEITER DESCRIPTIONS <br /> 0 <br /> CLEAN ♦D . . WELL GRADED GRAVELS GRAVEL <br /> GRAVEL. GRAVELS o c; D G W SAND MIXTURES LITTLE OR NO <br /> AND Q o0 FINES <br /> GRAVELLY POORLY GRADED GRAVELS <br /> SOILS <br /> (LITTLE OR NO FINES) � �•� � GP GRAVEL SAND MIXTURES LITTLE <br /> OR NO FINES <br /> COARSE <br /> GRAINED GRAVELS WITH GM SILTYGRAVELS GRAVEL SAND <br /> SOILS MORE THAN 50% FINES SILT MIXTURES <br /> OF COARSE <br /> FRACTION <br /> RETAINED ON NO <br /> 4 SIEVE (APPRECIABLE G.G. CLAYEY GRAVELS GRAVEL SAND <br /> AMOUNT OF FINES) CLAY MIXTURES <br /> WELL <br /> MORE THAN 50% SAND <br /> CLEAN SANDS SW ANDS LLIITTEEORNDFINESVELLY <br /> OF MATERIAL IS AND <br /> LARGER THAN SANDY <br /> NO 200 SIEVE SOILS POORLY-GRADED 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% FINES `SM MIXTURES <br /> OF COARSE <br /> FRACTION <br /> PASSING ON NO <br /> 4 SIEVE (APPRECSABLESG. 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 /> FINE LIQUID LIMIT MEDIUM PLASTICITY GRAVELLY <br /> GRAINED AND LESS THAN 50 CL GAYS SANDY CLAYS SILTY CLAYS <br /> CLAYS —— — LEAN CLAYS <br /> SOILS <br /> ORGANIC SILTS AND ORGANIC SILTY <br /> OL <br /> — — — CLAYS OF LOW PLASTICITY <br /> MORE THAN 50k INORGANIC SILTS MICACEOUS OR <br /> OF MATERIAL IS MH DIATOMACEOUS FINE SAND OR <br /> SMALLER THAN SILTY SOILS <br /> NO 200 SIEVE 111111 <br /> SIZE SILTS <br /> LIQUID LIMIT INORGANIC CLAYS OF HIGH <br /> AND GREATER THAN 50 CH PLASTICITY <br /> CLAYS <br /> ORGANIC CLAYS OF MEDIUM TO <br /> 0H 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 s/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 /> Slit& Cla Below No 200 Below 0 074 <br /> SECOR <br /> Internatwnal Incorporated <br />