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<br /> <br />Soil Classification <br />Grouo Group Name <br />Criteria for Assigning Group Symbols and Group names Using Laboratory Tests Symbol <br />Coarse-Grained Grovels more than Clean Gravels Less <br />Soils more than 50% of coarse than 5% fines Cu>4 and <Cc5;3E GW Well-graded gravel` <br />50% retained on <br />No. 200 sieve fraction retained <br />on No. 4 sieve <br />Cu <4 and/or 1>Cc>3E <br />GP <br />Poorly-graded gravel, <br /> Gravels with Fines Fines classify as ML or MH GM Silty gravel, G,H <br /> more than 12% <br /> fines Fines classify as CL or CH GC Clayey Gravel r,a.x <br /> Sonds 50% or Clean Sands Less Cu>& and 1<_c<3' SW Well-graded sand' <br /> more coarse than 5% fines <br />E <br /> fraction passes Cu<6 and/or 1>CC>3 SP Poorly-graded sand' <br /> No. 4 sieve <br /> Sands with Fines Fines classify as ML or MH SM Silty sand"u <br /> more than 12% <br /> fines Fines classify as CL or CH Sc Clayey sand`" <br />Fine-Grained Silts and Clays inorganic PI >7 and plots on or above "A"Line' CL Lean cloy <br />Soils 50% or Liquid Limit less <br />more passes the than 50 PI<4 or plots below 'A"Line' ML Silt" " <br />No. 200 sieve <br />organic Liquid Limit - oven dried Organic ciayera" <br /><0.75 OL <br />Liquid Limit - not dried Organic silt"" <br />Silts and Clays inorganic PI plots on or above "A"line CH Fat clay <br />Liquid Limit 50 or <br />more PI plots below "Aline MH Elastic Silte}'u <br />organic Liquid Limit - oven dried Organic clay"',` <br /> Liquid Limit - not dried <0. <br />Organic sitt"u'a <br />Highly organic soils Primarily organic matter, dark in color, and organic odor PT Peat <br />'Based on the material passing the 3-in. (75- E (D <br />Cu=D <br />/D1 Cc= elf soil contains 15 to 295Plus No. 200, add <br />whichever is <br />'with sand' or 'with grovel' <br />mm) sieve <br />sill field sample contained cobbles or boulders, <br />' <br />' . <br />D X D , <br />predominant <br />Lif sod contains 2 30" plus No. 200 <br />with cobbles or boulders, or bath <br />or both, add predominantly sand, add sandy to group <br />to group nome. rif soil contains 2155 sand, add"with -sand"to <br />,Grovels with 5 to 12x fines required dual group name, uif soil contains 2 30% plus No. 200 <br />symbols. cif fines classify as CL-ML, use dual symbol <br />predominantly gravel, add 'gravely' to group <br />GW-GM well graded gravel with silt GC-CM, or SC-SM. <br />GW-GC well-graded gravel with cloy 'if fines 'are organic, add"with organic fines to name. <br />oP and pints on or above 'A" Tine. <br />4 <br />GP-GM poorly-graded gravel with silt <br />GP-GC oorl raded ravel with do <br />e <br />E <br />t name <br />group <br />of sad contains >15Xgrovel, add"with gravel' Plg <br />4 or plots below 'A' tine. <br />PM plats on or above 'A' line. <br />rnes require dual <br />Sands with 5 <br />o to to cj,..p r- aPl plots below "A' line. <br />symbols. +if Atterberg limits plots' shaded area, sad is a <br />SW-SM well-graded sand with silt CL-ML, silty day <br />SW-SC well-graded and with cloy <br />SP-SM poorly graded sand with silt <br /> <br />SP-SC poorly graded sand with clay 75 OH <br />61 <br />5( <br />lL <br />4t <br />x <br />W <br />D <br />z <br />r- <br />U <br />E <br />2( <br />J <br />d <br />' I[ <br /> <br />0 <br />0 <br />For clvasiri-clan of line-grained -0s <br />and 11ere-9-i-d fr-Wo W mvrse- <br />' <br />grvared 8i ? <br />? <br />Enuatlan v/ 'A'-Me <br />Harimntol vt PI-4 tv LL-255, <br />then PI-Q73 (LL-20) ei <br />?? \ <br />n <br />Equation er U,-r.. ± Q S <br />ventral et LL-15 to PI-7 P <br />, <br />then 1`I=0.9 (LL-8) <br />' ` <br />G <br /> .' d- <br /> <br />A <br />/1 M H o ' 0 H <br /> ML ° R OL <br />/ -M <br />10 20 30 40 50 6o 70 60 90 100 710 <br />LIQUID LIMIT (LL)