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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> GROUP NAME GROUP SOIL DESCRIPTION Comments <br /> SYMBOL <br /> Peat Pt Highly organic soils <br /> Fat Clay CH Clay-Liquid limit>50%* 50%or more is <br /> Plastic Silt MH Silt-Liquid limit>50% * smaller than <br /> Lean Clay CL Clay-Liquid limit<50%* No. 200 sieve <br /> Silt ML Silt- Liquid limit<50% <br /> Silty Clay CL-ML Silty Clay <br /> Clavey Sand Sc Sands with 12 to 50 percent <br /> Silty Sand SM smaller than No.200 sieve <br /> Poorly-graded Sand with Clay SP-SC More than 50% is <br /> Poorly-graded Sand with Silt SP-SM Sands with 5 to 12 percent larger than <br /> Well-graded Sand with Clay ** SW-SC smaller than No.200 sieve * No.200 sieve and <br /> Well-graded Sand'with Silt** SW-Sm %sand>%gravel <br /> Poorly-graded Sand SP Sands with less than 5 percent <br /> Well-graded Sand** SW smaller than No-200 sieve * <br /> Clayey Gravel GC Gravels with 12 to 50 percent <br /> Silty Gravel GM smaller than No.200 sieve <br /> Poorly-graded Gravel with Clay GP-GC More than 50%is <br /> Poorly-graded Gravel with Silt GP-GM Gravels with 5 to 12 percent larger than <br /> Well-graded Gravel with Clay** GW-GC smaller than No.200 sieve * No.200 sieve and <br /> Well-graded Gravel with Silt ** GW-GM %gavel>%sand <br /> Poorly Graded Gravel GP Gravels with less than 5 percent <br /> Well-graded Gravel ** GW smaller than No.200 sieve <br /> * See Plasticity Chart for definition of silts and clays. <br /> ** See definition for well graded. <br /> LEGEND OF TERMS <br /> SAMPLE IDENTIFICATION <br /> PLASTICITY CHART U- Undisturbed(shelby tube) <br /> P do S'-Split barreVSPT(disturbed) <br /> I I + I C-California Sampler <br /> L- Lasky continous sampler <br /> S 'o A - Auger cuttings(sack sample) <br /> _ I i <br /> t <br /> Zj'CH orOHB- Bulk sample(auger cuttings40 ; H - Head space sample <br /> C i CONSISTENCY OF COHESIVE SOILS <br /> " 30 ; I l Unconfined Comp.Streneth. Qu. Psf <br /> t ' CL I <500 Very Soft <br /> y ! ( I or I MH oq OH 500-1000 Soft <br /> 20 + ! 1000-2000 Medium stiff(Firm) <br /> I i I i j 2000-4000 Stiff <br /> 4000-8000 Very stiff <br /> tU >8000 Hard <br /> Ott I ML fo <br /> d r OL I i <br /> 1 <br /> RELATIVE DENSITY OF GRANULAR SOILS <br /> e 0 l ' N-blows per Foot <br /> x 0 10 20 30 40 50 60 70 30 90 too 0-3 Very loose <br /> _ Liquid Limit 4-9 Loose <br /> 10-29 Medium Dense <br /> 30-49 Dense <br /> 50-80 Very Dense <br /> ALLIED TEST CLASSIFICATION CRITERIA FOR SANDS AND GRAVELS <br /> DRILLING Well graded sands(SW) Cu=D6/1)10>_6 and C,=(D;o)=/(D,o x DO) <_3 and>_ I <br /> Well graded gravels(GW) C„=DO/D,o_>4 and Cr=(D;o)'/(D,o x.Dom) 5 3 and>_ <br /> - COMPANY Coarse FineCoarse I Medium I Fine FINES <br /> Boulders Cobbles <br /> Gravel Gravel Sand Sand Sand I (silt or clay) <br /> Sieve sizes 10" 3" 3/4" #4 #10 #40 #200 <br />