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MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> r GRAVELS G W well graded gravels or grave)-sand mixtures,little or no fines <br /> J- <br /> �: = <br /> - GP Poorly graded grovel® or gravel-land mixtures,little or no floe• <br /> sn • <br /> (More than 1/2 of <br /> 00 coarse fraction:i. GM Silty grovels, gravel-sand-slit mixtures <br /> W N • no. 4 sieve else) <br /> z>= G C clayey grovels, gravel-send—clay mixtures <br /> 4cc Co <br /> mss" SANDS S W Well-groded sosds or gravelly sends, little or no fres <br />�0 oS P - Poorly graded sends or gravelly sends, little or no finM <br /> ts A (More then V2 of <br /> o— coarse fraction< S M Silty sands, sand-silt mixtures <br /> � no. 4 sieve else) <br /> S C Clayey sands, sand— cloy mixtures <br />' s7 Inorganic silts and very fine sands,rock flour, silty cw clayey <br /> M L <br /> �— • fine sands o► clayey silts with slight plasticity <br /> SILTS 8 CLAYS <br /> n: C L Inorganic cloys of low to Medium plasticity, gravelly clays, <br /> LL < 50 sandy cloys, silty cloys, loon cloys <br /> W"" 0 L Organic silts and organic silt cloys of low plasticity <br /> v r y <br /> a° 0 Inorganic silts, micaceous or dictomaceous fine sandy <br /> ¢c' 0 M H or silt soils, elastic silts <br /> *- SILTS 8 CLAYS y <br /> W C C H Inorganic clays of high plasticity, fat cloys <br /> z ° <br /> —� LL > 50 <br /> �-- v OH Organic clays of,rnodium to high plasticity , organic <br /> silty clays, organic silts <br /> HIGHLY ORGANIC SOILS Pt Peot and other highly organic soils <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> IDescription Blows At. Description Blows/ft. U.S. Standard Groin Size <br /> Sieve Size in Millimeters <br /> IVery Soft < 3 Very Loose < 5 BOULDERS Above 12" Above 305 <br /> Soft 3 - 5 Loose 5-15 COBBLES 12"to 3" 305 to 76.2 <br /> Medium (firm) 6- 10 Medium Dense 16-40 GRAVEL 3" to No. 4 76.2 to 4.76 <br /> Stiff II - 20 Dense 41-65 coorse (c) 3"to3/4" 76.2 to 19.1 <br /> fine ( f ) 3/4" to No 4 19.1 to 4.76 <br /> Very Stiff 21-40 Very Dense > 65 <br /> SAND No.4 to N0.200 4.76 to 0.074 <br /> Hord > 40 coarse ic) No.4 to No 10 4.76 to 2.00 <br /> Medium (m) No-10 to No 40 2.00 to 0.420 <br /> CONSISTENCY CLASSIFICATION fine (f) No-40 toNo.200 0420 to 0.074 <br /> SILT 8 CLAY Below No.200 Below 0.074 <br /> GRAIN SIZE CLASSIFICATION <br /> PAOJEGT NO 90-190 <br /> BUCKEYE RANCH <br /> gest Lake Road at Molelumne River DATE: 6/90 <br /> San Joaquin County, California PLATE NO: 12 <br />