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Unified Soil Classification System <br /> Major Divisions Symbols Typical Names <br /> o_aX�.0 <br /> WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES. <br /> °-°- GW LITTLE OR NO FINES <br /> p.:e. 'a <br /> Gravels 0 0 0 ° <br /> 0 0 0 0 POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES, <br /> o 0 0 o LITTLE OR NO FINES <br /> O a O O <br /> 00 A (MORE THAN HALF OF o 0 o GM <br /> p� COARSE FRACTION > 0 0 o SANDY GRAVELS, GRAVEL-SAND-SILT MIXTURES <br /> (1}N w NO. 4 SIEVE SIZE) 0 0 0 <br /> N 0 <br /> 10 0 0 0 o GC CLAYEY GRAVELS, GRAVEL-SAND--CLAY MIXTURES <br /> AL,X 0 0 <br /> cd <br /> WELL GRADED SANDS OR GRAVELLY SANDS, L1TrLE OR <br /> Z a Sw NO FINES <br /> Lu o Sands 4'=' POORLY GRADED SANDS OR GRAVELLY SANDS, LITTLE OR <br /> ca p z - SP NO FINES <br /> U� <br /> (MORE THAN HALF OF SM <br /> COARSE FRACTION < SILTY SANDS, SAND-SILT MIXTURES <br /> NO. 4 SIEVE SIZE) <br /> SC INORGANIC SILTS AND VERY FINE SANDS, ROCK FLOUR SILTY OR <br /> CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> ML INORGANIC SILTS AND VERY FINE SANDS, ROCK FLOUR SILTY <br /> FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> A Silts and Clays INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELLY <br /> co _J0 4 O CL CLAYS, SANDY CLAYS. LEAN CLAYS <br /> a <br /> a I L { OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> INORGANIC SILTS, MICACEOUS OR DIATOMACEOUS FINE <br /> N MH SANDY OR SILTY SOILS, ELASTIC SILTS <br /> Silts and Clays <br /> lr o z LL = ( 50CH INORGANIC SILTS OF HIGH PLASTICITY, FAT CLAYS <br /> U <br /> ORGANIC CLAYS OF HIGH PLASTICITY, ORGANIC SILTY <br /> OH CLAYS. ORGANIC SILTS <br /> Highly Organic Sobs Pt PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> Grain Size Chart Sample Designation <br /> } <br /> Range of Grain Sizes <br /> Class'sfication <br /> o <br /> U.S. STANDARD GRAIN SIZE <br /> SIEVE SIZE IN MILLIMETERS a <br /> BOULDERS ABOVE 12' ABOVE 305 <br /> DRIVE SAMPLE INTERVAL <br /> COBBLES 12" TO 3" 305 TO 76.2 <br /> GRAVEL T TO NOA 76.2 TO 7.76 CONTINUOUS CORE <br /> coarse 3" TO 3/4" 76.2 TO 4.76 SAMPLE INTERVAL <br /> fine 3/4' TO NO.4 19.1 TO 4.76 <br /> SAND NOA TO NO.200 4.76 TO 0.074 NR NO RECOVERY <br /> coarse NOA TO NO.10 4.76 TO 2.00 <br /> U <br /> medium NO.10 TO N0.40 2.00 TO 0.420 ND NOT DETECTED <br /> ? fine NO.40 TO NO.200 0.420 TO 0.074 <br /> x <br /> SILT & CLAY BELOW N0.200 BELOW 0.074 �- F=IRST WATER (bgs) <br /> ' STABILIZED WATER LEVEL (bgs) <br /> SECOR <br /> _m INTERNATIONAL <br /> N INCORPORATED <br /> 6 <br /> O+ <br /> O. <br />