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I <br /> Unified Soil Classification System <br /> Mayor Dimions Symbols Typical Names <br /> p o a o <br /> e U e e WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES <br /> o a q GW LITTLE OR NO FINES <br /> p e ^o <br /> Gravels ° ° ° <br /> POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES <br /> 0 0 o eGP UTILE OR NO FINES <br /> I Oen a <br /> e e n <br /> 03 A (MORE THAN HALF OF GM <br /> p COARSE FRACTION 7 e e ° SANDY GRAVELS GRAVEL-SAND-SELT MIXTURES <br /> H w NO 4 SIEVE SIZE) o o ° <br /> GC CLAYEY GRAVELS GRAVEL—SAND—CLAY MIXTURES <br /> WELL GRADED SANDS OR GRAVELLY SANDS UTTL.E OR <br /> a SW NO FINES <br /> N <br /> 1 �~ <br /> w p Sands SP POORLY GRADED SANDS OR GRAVELLY SANDS LITTLE OR <br /> 00 p NO FINES <br /> U <br /> (MORE THAN HALF OF <br />' COARSE FRACTION < SM SILTY SANDS SAND-SILT MIXTURES <br /> NO 4 SIEVE SIZE) <br /> ScINORGANIC SILTS AND VERY FINE SANDS ROCK FLOUR SILTY OR <br /> V CLAYEY FINE SANDS OR CLAYEY SILTS WMA SLIGHT PLASTICITY <br />' ML INORGANIC SILTS AND VERY FINE SANDS ROCK FLOUR SILTY <br /> FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> n Silts and Clays CL INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELLY <br /> _ < 50 CLAYS SANDY CLAYS LEAN CLAYS <br /> LL <br /> o OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> CD <br /> _ INORGANIC SILTS MICACEOUS OR DIATOMACEOUS FINE <br /> MH' SANDY OR SILTY SOILS ELASTIC SILTS <br /> Sifts and Clays <br /> C CH INORGANIC SILTS OF HIGH PLASTICITY FAT CLAYS <br /> � 0 LL - < 50 F//", <br />' v j! ORGANIC CLAYS OF HIGH PLASTICITY ORGANIC SILTY <br /> OH CLAYS ORGANIC SILTS <br />' HigWy Organic Soils Pt PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> Grain Size Chart Sample Designation <br />' Range of Grain Sizes W <br /> CiasSif"lCatlOn U S STANDARD GRAIN SIZE W <br /> SIEVE SIZE IN MILLIMETERS <br /> BOULDERS ABOVE 12' ABOVE 305 <br /> DRIVE SAMPLE INTERVAL <br /> I COBBLES 12' TO 3" 305 TO 762 <br /> GRAVEL 3" TO NO 4 762 TO 776 CONTINUOUS CORE <br /> coarse 3- TO 3/4" 762 TO 476 SAMPLE INTERVAL <br /> fine 3/4" TO NO 4 191 TO 476 <br /> SAND NO 4 TO NO 200 476 TO 0 074 NR NO RECOVERY <br /> coarse NO 4 TO NO 10 476 TO 200 <br /> medium NO 10 TO NO 40 200 TO 0420 ND N07 DETECTED <br /> fine NO 40 TO NO 200 O 420 TO 0 074 <br /> SILT do CLAY BELOW NO 200 BELOW 0 074 FIRST WATER (bgs) <br /> T <br /> STABILIZED WATER LEVEL (bgs) <br /> a SEcoR T <br /> b iNTEIriNATIONAL <br /> .,, INW11KI;-ATED <br /> I � <br /> 0 <br /> a <br /> P <br />