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UNIFIED SOIL CLASSIFICATION SYSTEM AMERICA[ � ASTM Designations: D 2487,D2488 ENGINEERING TESTING,INC. Soil Classification Notes Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests" Group Group Name 'Based on the material passing the 3-in Symbol V5-nrm) sieve, Coarse-Grained Gravels More Clean Gravels Cu�4 and 1<Cc<3 GW Weli graded gravel If•field sample contained cobbles or Soils More than 50%coarse Less than 5% _ boulders,of both, add"with cobbles or than 50114 fraction retained finest Cu<4 arid/or IaCc>3 GP Poorly graded gravel boulders,or both"to grog name, retained on on INo.4 sieve cGravels with 5 to 12%fines require dual No.200 sieve Gravels with Fines classify as ML or MH GM Silty grave symbols: Fines more GW-GM well-graded gravel with silt titan 12%fines c Fines classify as CL or CH GC Clayey gravel GW-GC Well-graded gravel with clay GP-GM poorly graded gravel with silt Sands 50%or Clean Sands Cti?6 and 1 cCc<3 SW Well-graded sand GP-GC poorly graded gravel with clay more of coarse Less than 5% – oSands with 5 to 12%fines require dual fraction passes fineso Cu<6 and I>Cca3 SP Poorly-graded sandT symbols: No.4 sieve SW-SM well-graded sand with silt Sands with Fines classify as ML or MH SM Silty sand SW-SC well-graded sand with clay Fines more SP-SM poorly graded sand with silt than 12%fines o Fines classify as CL or CH SC Clayey saltd ' SP-SC poorly graded sand with clay Fine-Grained Silts and Clays inorganic Ply7 and plots on or above CL Lean cla Soils 50%or Liquid limit less "A"finer (DA more passes than 50 PI=4 or Mots below ML Silt MA =Ili+tDt.t Cc= the No.200 "A"line D Lip K Bill sieve organic Liquid limit—oven_dried OL OrganiccI F `•U.75 If soil contains>15%sand,add"with (see Plasticity Liquid Iinit—not dried Organic i L H?A silt ' ' sand"to group name_ Chart below) GIf fines classify as CL-M L,use dual Silts and Clays Inorganic PI Plots on orabove"A"line CH Fat cia Ymbol GC-GM,or SC-SM- Liquid limit 50 t If fines are organic,add"with organic or more Pl plots below"A"line MH Elastic sil fines"to group name. 11fsoiI contains 3 15%gravel,add"with organic OH Organic cla ravel"to group name. Liquid]iinit—oven dried,*. 7g [€Atterberg limits plot is hatched area, Liquid Iimit—not dried Organic si ILK,LAW soils is a CLML silty clay. Highly organic Primarily organic matter, dark PT Peat Flf soil contains 15 to 29%plus No.200 soil in color,and organic in odor add"with sand"or "with gravel", whichever is predominant, LI f soil contains X30%plus No-200, SIEVEANALYSr6 w predominantly sand,add "sandy"to Fcr driliwim M&ie-uanxd spiv and -dmnR,w:m Vol-�—s.N.urra.e—•--1 awm.rrcerra6ondcwneva+kM ua�i. gC011p' mlf sail contains>30%plus No.200, ,o] I.4 ' 0 1:+ia wof Adint + xa"zw"Ira•areu•sss. Y pred ominantly gravel.add "gravelly„ —__{m w 0-pi -M s, 'Z' to group name. ? [�anon xvane NPI>4 and plots on or above"A"line. a.�s9rUn �l -i a varu=IemPl=r. G`�` oPl<4ar Intsbelow"A"line, m 1. n p erkd•a9;LL�1 P a ti — — '0 IM plots on or above"A"lisle. l� L 4Pl plots below"A"line. QO y,F,, RFiber Content desc ri ption shown below. 33 �' ; 40 _ i sa - W as so 661l 70 R W ,cu lie PARTICLE SIZE IN MILUMErERS UQUID LIMIT(t•Y G-a•Qy. Plasticity Chart ADDITIONAL TERMINOLOGY NOTES USED BY AET FOI2 SOIL IDENTIFICATIOiN AND DESCRIPTION Grain Si xe Gravel Fercentaaes Consistency of Plastic Soils Relative Density ofNlaiI-Plastic Soils Term Panicle Size Term Percent Tenn _N-Value BPF Term Nl-Value R Boulders Over 12" A Little Gravel 3%-14% Very Soft less than 2 Very Loose 0-4 Cobbles 3"to 12" With Gravel 15%-29% Soft 2-4 Loose 5-10 Gravel #4 sieve to 3" Gravelly 30%-50% Firm 5-8 Medium Dense 11-30 Sand 4200 to#4 sieve Stiff' 9-15 Dense 31-50 Fines(silt&clay) Pass#200 sieve Very Stiff' 16-30 Very Dense Greater than 50 Hard Greater than 30 Moisture/FrostConditi on -Layering Notes f�iberCantcntoiPeat Organiclftonts rscriotion(if,noIabtess) (MC Column) Laminations: Layers less than Fiber Content Soils are described as gMgpdc,if soil is not peat D(Dry): Absense of moisture,dusty,dry to W thick of Term [Visual F.stimatel and is judged to have sufficient organic fines touch- differing material content to influence the soil properties. 51_ighrjY M(Moist): Damp,although free water not or color. Fibric Peat: Greater than 67% or¢wn used for borderline cases. visible- Soil may soil have a high Hemic Peat-. 33—67% water content(aver"optimum'}. Lenses: Packets or layers Sapric Peat: Less than 33% With roots: Judged to have sufficient quantity W(Wet/ Free water visible intended to greater than'" of rootsto influence the soil Waterbearing): describe Ion-plastic soils. thick of differing properties. Waterbearing usually relates to material or color. Trace roots: Shall roots present,but not judged sands and sand with silt. to be to sufficient quantity to F(Frozen): Sail frozen significantly affect sail properties- 0 1 CLS021(2/04) AMERICAN ENGINEERING TESTING,INC.