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1 rerracon
<br /> UNIFIED SOIL CLASSIFICATION SYSTEM GeoReport
<br /> Soil Classification
<br /> Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests a Group Group Name
<br /> Symbol
<br /> Clean Gravels: Cu 114 and 1<Cc<3 GW Well-graded gravel F
<br /> Gravels: Less than 5%fines c Cu<4 and/or[Cc<1 or Cc>3.0] GP Poorly graded gravel F
<br /> More than 50%of
<br /> coarse fraction Fines classify as ML or MH GM Silty gravel F,G,H
<br /> retained on No.4 sieve Gravels with Fines:
<br /> Coarse-Grained Soils: More than 12%fines c Fines classify as CL or CH GC Clayey gravel F,G,H
<br /> More than 50%retained
<br /> on No.200 sieve Clean Sands: Cu 116 and 1<Cc<3 E SW I Well-graded sand
<br /> Sands: Less than 5%fines o Cu<6 and/or[Cc<1 or Cc>3.0]E SP Poorly graded sand 1
<br /> 50%or more of coarse
<br /> fraction passes No.4 Sands with Fines: Fines classify as ML or MH SM Silty sand G,H,
<br /> sieve
<br /> More than 12%fines o Fines classify as CL or CH SC Clayey sand G,H,
<br /> Inorganic: PI>7 and plots on or above"A" CL Lean clay K,L,M
<br /> Silts and Clays: PI<4 or plots below"A"line J ML Silt K,L,M
<br /> Liquid limit less than 50 Liquid limit-oven dried Organic clayK,L,M,N
<br /> Fine-Grained Soils: Organic: <0.75 OL
<br /> 50%or more passes the Liquid limit-not dried I Organic silt K,L,M,o
<br /> PI plots on or above"A"line CH Fat clayKp L,M
<br /> No.200 sieve Inorganic:
<br /> Silts and Clays: PI plots below"A"line MH Elastic Silt K,L,M
<br /> Liquid limit 50 or more Liquid limit-oven dried Organic clay K,L,M,P
<br /> Organic: <0.75 OH Liquid limit-not dried Organic silt K,L,M,o
<br /> Highly organic soils: Primarily organic matter,dark in color,and organic odor PT Peat
<br /> A Based on the material passing the 3-inch(75-mm)sieve. H If fines are organic,add"with organic fines"to group name.
<br /> B If field sample contained cobbles or boulders,or both,add"with cobbles I If soil contains❑15%gravel,add"with gravel"to group name.
<br /> or boulders,or both"to group name. J If Atterberg limits plot in shaded area,soil is a CL-ML,silty clay.
<br /> cGravels with 5 to 12%fines require dual symbols: GW-GM well-graded Kif soil contains 15 to 29%plus No.200,add"with sand"or"with
<br /> gravel with silt,GW-GC well-graded gravel with clay,GP-GM poorly gravel,"whichever is predominant.
<br /> graded gravel with silt,GP-GC poorly graded gravel with clay.
<br /> o Sands with 5 to 12%fines require dual symbols: SW-SM well-graded If soil contains El 30%plus No.200 predominantly sand,add
<br /> "sandy"to group name.
<br /> sand with silt,SW-SC well-graded sand with clay,SP-SM poorly graded
<br /> sand with silt,SP-SC poorly graded sand with clay. MIf soil contains❑30%plus No.200,predominantly gravel,add
<br /> "gravelly"to group name.
<br /> (D30)2 N PI❑4 and plots on or above"A"line.
<br /> E Cu=D6o/D,o Cc= O PI<4 or plots below"A"line.
<br /> D10 X D60 P PI plots on or above"A"line.
<br /> F If soil contains❑15%sand,add"with sand"to group name. OR plots below"A"line.
<br /> G If fines classify as CL-ML,use dual symbol GC-GM,or SC-SM.
<br /> 60
<br /> For classification of fine-grained
<br /> soils and fine-grained fraction
<br /> 50 of coarse-grained soils ��e ' e
<br /> Equation of"N'-line
<br /> Horizontal at PI=4 to LL=25.5.
<br /> x 40 then PI=0.73(LL-20)
<br /> p Equation of"U"-line C►�°�
<br /> Z Vertical at LL=16 to PI=7,
<br /> r 30 then PI=0.9(LL-8)
<br /> r
<br /> cj 20
<br /> g MH or OH
<br /> IL '
<br /> 10 ,
<br /> 7 ---
<br /> 4 - ML or OL
<br /> 0
<br /> 0 10 16 20 30 40 50 60 70 80 90 100 110
<br /> LIQUID LIMIT (LL)
<br />
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