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i 16 ' GRAPHIC LETTER MAJOR DIVISIONS SYMBOL SYMBOL TYPICAL DESCRIPTIONS 6*� f f WELL GRADED GRAVELS GRAVEL 1V A; GW SAND MIXTURES LITTLE OR NO GRAVEL F{NES AND CLEAN GRAVELS kv f GRAVELLY SOILS (LITTLEORNO �~ POORLY GRADED GRAVELS FINES) Y+ • GP GRAVEL SAND MIXTURES LITTLE OR NO FINES COARSE • GRAINED °i SOILS ULM SILTY GRAVELS GRAVEL$ANO GM SILT MIXTURES GRAVELS WITH FINES MORE THAN 50% ' OF COARSE FRAC {APPRECIABLE TION RETAINED AMOUNT OF FINESY ONNO 451EVE CLAYEY GRAVELS GRAVEL SAND GC CLAY MIXTURES °,°,°• VELLGRADEDSANOS GRAVELLY SW SANDS LITTLE JR NO-INES SAND CLEAN SAND O e AND (LITTLE OR VO ° •c SANDY FINES] SOILS POORLY GRADEO$ANDS GRAVE'- MOPE THAN 50' SP LY SANDS LITTLE OR NO°INES OF MATERIAL IS LARGER THAN VO 200 SIEVE SIZE s;Lry sANos sAiIO SALT SANDS VITH FINES SM MIXTURES MORE THAN 50° OF COARSE FRAC (APPREC ABLE TION PASSING AMOUNT OF FINES; NO 4 SIEVE CLAYEY SANDS SANC C,AY J SC MIXTURE$ INORGANIC SIL TIS AND VERY FINE ! ML SANDS ROCK FLOOR SILTY OR ' I CLAYEY FINE SANDS GR C-AYEY SILTS WITH SLIGH-PLASTICITY FINE SILTS INORGANIC CLAYS O°LOW TO GRAINED AND LIQUID LIMIT CL MEDIUM PLASTIC TY GRAVELLY SOILS CLAYS LESS THAN 50 CLAYS SANDY CLAYS SILTY CLAYS LEAN C_AYS I I I I I I I I 1 ORGANIC SILTS AND ORGANIC I I I I 1 11 11 OL SILTY CLAYS OF LCW PLASTICITY I�IIIIIIi IIIIIIIII INORGANIC SILTS MICACEu^u56R MH OIA-OMACEOUS FINE SAND OR S I LTY SOI LS MORE THAN ED°' $iLrS OF MATERIAL IS AND LIQUID LEMIT INORGANIC CLAYS OF HIGH SMALLER THAN NO CLAYS GREATER THAN 50 CH PLASTICITY FAT C-AYS 200 SIEVE SIZE ORGANIC CLAUS OF MEDIUM TO OH HIGH PLASTICITY ORGANIC SILTS ' HIGHLY ORGANIC SOILS PT PEAT HUMUS SWAMP SOILS WITH HIGH ORGANIC CONTENDS ' NOTE DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS UNIFIED SOIL CLASSIFICATION SYSTEM ' Lusx GEOSCIENCES FIGURE B1