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UNIFIED SOIL CLASSIFICATION SYSTEM AMERICAN �
<br /> ASTM Designatioas:D 2487,D2488 ENGINEERING
<br /> • TESTING,INC. ��
<br /> soil ctavsification Notes
<br /> Criteria for Asaigning(iroup Symbots and Group Nemes Using Laborffiory Tesls" Group Group Name �Based on the maurial passing the 3-in
<br /> S mbol S�5-mm) sieve.
<br /> Coarse-Grained Gaavels More Clean Gravels Cu?4 and 1<Cc4 GW Well graded gravel If field sample contained cobbla or
<br /> Soils More than 50%coarse Less than 5% boulders,or both, atld"with cobbtes or
<br /> than 50% fraction retained fines� Cu<4 and/or l>Cc>3 GP Poorly gradad grave boulders,or both"to group name.
<br /> retained on on No.4 sieve �Gravels with 5 to 12Yo fines requiro dual
<br /> No.200 sieve Gravels with Fines clessify as ML or Mfi GM Silty g[ave � symbols:
<br /> Fines more GW-GM well-gaded gravel with silt
<br /> than 12%fines� Fines classify as CL or CH GC Clayey grave ' GW-GC well-gradtd g►avel with clay
<br /> GP-GM poorly g�aded gmvel with silt
<br /> Sands SO%or Clean Sands Cu?6 and l<Cc<i SW Well-graded sand GP-GC poody gradad gravel with clay
<br /> more of coarse Less than 5% °Sands with 5 to 12%fines requirc dual
<br /> fraction passes fines° Cu<6 and/or 1>C�3 $P Poorly-graded sand symbols:
<br /> No.4 sieve SW-SM well-graded sand with silt
<br /> Sands with Fines clagsity as ML or MH SM Silty sand SW-SC well-graded send with clay
<br /> Fines more SP-SM poorly gradad sand with silt
<br /> then 12%fines° Fines classi as CL or CH SC Cla sand SP-SC poorly grnded sand with clay
<br /> Fino-Grained Silts and Cleys inorganic PI>7 end plotv on or above CL I,ean cla _
<br /> �oils 50%or Liquid limit less "A"line� fgo�
<br /> more passes than 50 PI<4 or plob below ML Sil ECu=Dco/D�o. Cc=
<br /> the No.200 , ••A"line' �ioX D�o
<br /> sieve organic Liauid limit-oven dried OL Organic cla P
<br /> <n.75 If soil co�ins>lS�o sand,add"with
<br /> Liquid limit-not dried Or anic si1tK�'"�'O sand"W name.
<br /> (seo Plasticity B �uP
<br /> Chart below) °If fines classify as CGML,use dual
<br /> Silts and Clays inorgenic PI plots on or above"A"l'ne CH Fat cla �mbol C�G['M,or SC-SM.
<br /> Liquid limit 50 If fines are organic,add"with organic
<br /> or more PI plots below"A"line MH Elastic sil fines"to group name.
<br /> �If soil cantains>ISYogravel,add"with
<br /> organic Liauid limit-ovai dried�p,�s OH Organic cla ¢ravel"to group name.
<br /> Liquid limit-not dried µ� If Atterberg licnits plot is hatched area,
<br /> Organic silt�' soils is a CIrML�silty clay.
<br /> High(y organic Primarily organic matter, dark PT Pea KIf soil corRains l5 W 29%plus No.200
<br /> soil in color,and organic in odor add"with sand"or "wwith grsvel",
<br /> whichever is predominenC
<br /> �If soil co�ins>30%plus No.200,
<br /> s�ua�ras p prodominandy sand,add "sandy"ro
<br /> ��,,,,,y„+oay��,,,M„w� for clas�l}Iatlo�of 1i�e Ined�ell�
<br /> on mlyro rac rn nerfrgrm_ i $IOlIpRB[LC.
<br /> , '' " , , H � w .. � MIf soil cantains>30%pius No.200,
<br /> a Eawtla�f'�-u,. �iy predominandy�avel,add "gravelly„
<br /> tl m x IMrl��nfal at VI-1 te LL-zs.s. J� ,r �.� to gro�name.
<br /> w then PI-0.73(LL-201 '�
<br /> � i,�0 Equotfae sf'U'-tln �'�PI>4 and plots on orabove"A"Ime.
<br /> � o o.=,a�.� p � Wrtlwl at LL•IB toP1• �� � °pl<4 or plou below"A"lina
<br /> F � tho PI•o.el��-el i G PPI plob on or above"A"l�e.
<br /> u QPI plols below"A"lire.
<br /> � ` d.u,,,,, p � ,�n ��� � RFiber Conunt description shown below.
<br /> � 2O � d MH OH
<br /> a pa-no�s�.� 6 i� G�
<br /> io
<br /> ° ,.!°° *-- ML�OL
<br /> ..�.. p...;.. . 1:0 6l QI
<br /> ��� _
<br /> P.eHTIQE SI�IN MWhEiERS �o io e eo 30 �o eo so ioo u
<br /> �•a.ame•m0 �•�•ams is'u LIOVID LIMIT(ll)
<br /> Plastici Chart
<br /> ,,.-�` "�c.3�_ � �j -- �: S OIL.IDE GATXO1Vi�CIVD�ESC4RIPTI01�
<br /> ���a:�.�..� -s:±-�..�.�.,���.-�� :.�.�,�. ,.,�.�IL. -��.� _ _ - --
<br /> ' ize . Gravel Percentaees Consi�tencv of Plastic Soils M1 Relative Densitv of Noo-Plastic Soils
<br /> Term Particle Siu Tu n Per e TeRn N-Va(ua BPF Ter N-Value BPF
<br /> Boulders Over I2" A Little Cttavel 3%-14% Very Soft less than 2 Very Loose 0-4
<br /> Cobbles 3"to 12' With Gravel 15%-29% Soft 2-4 I,00se 5-10
<br /> G�avel 1W sieve to 3" Gravelly 30%-50% Fiicn S-8 Medium Dense I 1-30
<br /> Sand !{200 to#4 sieve Stiff 9-15 Dense 31-50
<br /> Fines(silt&clay) Pass 1�200 sieve Very Stiff 16-30 Very Dense Greater than 50
<br /> Hard Greater then 30
<br /> MoistureJFrost Condition Laverine Notes Peat Descriution Or¢anic Descriotion(if no lab tesfsl
<br /> (MC Column) Soils are desc�bed as�if soil is not peat
<br /> D(Dry): Absense oFmoisture,dusty,dry to and is judged to have sutTicient orgenic fines
<br /> Laminations: Layers less than Fiber Content
<br /> touch. � con6ent to influena ffie Liquid LimitpropeRies.
<br /> r4" thick of Te�m (Visual Estimatel
<br /> M(Moist): Damp,although froe water not S!lrhdv orranic used for bo�derline cases.
<br /> differing material
<br /> visible. Soil mny still have a high Root Inclusions
<br /> water content(over"opdmum"). or color. Fibric Peat: Greater than 67% �yiy�roots: Judged to have sufficient quanrity
<br /> Hemic Peat: 33-67%
<br /> W(WeU Free water visible intended to of roots to intlumce the soil
<br /> Waterbearing): describe non-plasdc soils. unses: Pockeb or layers Sapric Peat: Less than 33% propeRies.
<br /> Watarbearing usually relates to g��� ��h Trace rools: Small roots presen�but not judged
<br /> sands and send with silt thick of differing to be in sufficient quentity to
<br /> F(Froun): Soil froun material or color. significanUy afFect soil properties.
<br /> O1CLS021 (07/08) AMERICAN ENGINEERING TESTING,INC.
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