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lierracon
<br /> • UNIFIED SOIL CLASSIFICATION SYSTEM GeoReport
<br /> Soil Classification
<br /> Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests Group Group Name
<br /> Symbol
<br /> Clean Gravels: Cu_.4 and 1 <_Cc_<3 E GW Well-graded gravel r —
<br /> Gravels: Less than 5%fines c Cu<4 and/or[Cc<1 or Cc>3.0]E 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 /> —
<br /> on No.200 sieve Clean Sands: Cu>_6 and 1 <_Cc<_3 E SW Well-graded sand
<br /> Sands: Less than 5%fines D 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 Fines classify as ML or MH SM Silty sand G,H,I
<br /> Sands with Fines:
<br /> sieve
<br /> More than 12%fines D Fines classify as CL or CH SC Clayey sand G,H,I
<br /> PI>7 and plots on or above"A" CL Lean clay K,L,M
<br /> Inorganic:
<br /> Silts and Clays: PI<4 or plots below"A"line" ML Silt K,L,M
<br /> Liquid limit less than 50 Liquid limit-oven dried Organic clay K,L,M,N
<br /> Fine-Grained Soils: Organic: <0.75 OL
<br /> 50%or more passes the Liquid limit-not dried Organic silt K,L,M,o
<br /> PI plots on or above"A"line CH Fat clay K,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
<br /> Liquid limit-not dried Organic silt K,L,M,0
<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 1 If soil contains>_15%gravel,add"with gravel"to group name.
<br /> or boulders,or both"to group name. "If Atterberg limits plot in shaded area,soil is a CL-ML,silty clay.
<br /> c Gravels with 5 to 12%fines require dual symbols: GW-GM well-graded K If 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 /> L
<br /> o Sands with 5 to 12%fines require dual symbols: SW-SM well-graded If soil contains>_30%plus No.200 predominantly sand,add
<br /> sand with silt,SW-SC well-graded sand with clay,SP-SM poorly graded "sandy"to group name.
<br /> sand with silt,SP-SC poorly graded sand with clay. P°If soil contains>_30%plus No.200, predominantly gravel,add
<br /> s "gravelly"to group name.
<br /> (D30) N PI>_4 and plots on or above"A"line.
<br /> E Cu=D60/D,o Cc= o PI<4 or plots below"A"line.
<br /> D x D 10 60 P PI plots on or above"A"line.
<br /> F If soil contains>_15%sand,add"with sand"to group name. o PI plots below"A"line.
<br /> G If fines classify as CL-ML,use dual symbol GC-GM,or SC-SM.
<br /> 60 . i I _ 1
<br /> For classification of fine-grained
<br /> soils and fine-grained fraction -'I
<br /> Equation ot�Aained soils .4•0"-line JN.,,, �P\,\fie
<br /> d Horizontal at P1=4 to LL=25.5.
<br /> X 40 — then PI=0.73(LL-20) C>�
<br /> pEquation of"U"-line �,', � �
<br /> Z Vertical at LL=16 to P1=7, ,� G Ai
<br /> } 30 - then PI=0.9(LL-8) 7-
<br /> v ,'ION'
<br /> P i , Vm
<br /> J ot
<br /> 20 f .. _._.__._.
<br /> a. ,'- MH or OH
<br /> 10 ' ,/
<br /> 7 ---
<br /> 4 ML or OL
<br /> 0 10 16 20 30 40 50 60 70 80 90 100 11#
<br /> LIQUID LIMIT (LL)
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