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' SOIL CLASSIFICATION CHART <br /> MAJOR DIVISIONS SYMBOLS TYPICAL <br /> ' GRAPH I LETTER DESCRIPTIONS <br /> CLEAN eo* oO WELL GRADED GRAVELS GRAVEL <br /> ti GRAVEL GRAVELS o �Oo G G W SAND MIXTURES LITTLE OR NO <br /> AND O uQ FINES <br /> ' GRAVELLY �'. POORLY GRADED GRAVELS <br /> SOILS (LITTLE OR NO PINES) �•� GP GRAVEL SAND MIXTURES LITTLE <br /> OR NO FINES <br /> COARSE <br /> ' GRAINED GRAVELS WITH ' ' QM SILTY GRAVELS GRAVEL SAND <br /> SOILS MORE THAN 50% FINES SILT MIXTURES <br /> OF COARSE <br /> FRACTION <br /> RETAINED ON NO <br /> 4 SIEVE (APPRECIABLEG+G. CLAYEY ORAVELS GRAVEL SAND <br /> ' AMOUNT OF FINES) CLAY MIXTURES <br /> CLEAN SANDS SW WELL-GRADED SANDS GRAVELLY <br /> MORE THAN 50% SAND SANDS LITTLE OR NO FI NES <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% `�M MIXTURES <br /> OF COARSE FINES <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 /> FINELIOUIDLIMIT MEDIUM PLASTICITY GRAVELLY <br /> GRAINED AND LESS THAN 50 CL CLAYS SANDY CLAYS SILTY CLAYS <br /> CLAYS LEAN CLAYS <br /> SOILS <br /> O L ORGANIC SILTS AND CRGANFC SILTY <br /> CLAYS OF LOW PLASTICITY <br /> MORE THAN 50% <br /> INORGANIC SILTS MICACEOUS OR <br /> OF MATERIAL IS <br /> ' SMALLER THAN 11111 <br /> M H DIATOMACEOUS FINE SAND OR <br /> NO 200 SIEVE NO <br /> SOILS <br /> slzE SILTS <br /> LIQUID LIMITINORGANIC CLAYS OF HIGH <br /> AND GREATER THAN 50 CH PLASTICITY <br /> CLAYS <br /> O 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%" 76 2 to 4 76 <br /> Fine W 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& Clay Below No 200 Below 0 074 <br /> SECOR <br /> ' International Incorporated <br />