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<br /> <br />LJ <br /> <br /> <br /> <br /> <br /> <br />t <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br />i <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests° Soil Classification <br /> Group <br /> S mbol Group Name <br />Coarse-Grained Gravels more than Clean Gravels Less Cu ? 4 antl t < Cc <3 G W Well-graded gravel <br />Soils more than 50 % 50°e of coarse than 5 % fines° <br />retained on No. 200 Traction retained on <br />sieve No. 4 sieve <br /> Cu < 4 antl/or 1 > Cc > 3 GP Poorl radetl ravel <br /> Gravels wdh Fines Fines clasvty as ML or MH GM Silty gravel G,H <br /> more than 72°'e fines° <br /> Fines classi as CL or CH GC Claye ravel <br />Sands 50% or more Clean Sands Less Cu > 6 antl 1 < Cc < 3` SW Well-gratletl santl <br />of coarse fraction than 5% fines' <br />passes No. 4 sieve <br /> Cu < 6 andlor 1 > Cc > 3 SP Poorl raded sand <br /> Sands with Fines more Fines classify as ML or MH SM Silty sand" <br /> than 72°e fnes° <br /> Fines Classi as CL or CH SC Cla a santl <br />Fine-Grained Soils Silts and Clays Liquitl inorganic PI > 7 antl plots on or aDOVe "A line' CL Lean clay <br />50 % or more passes limit less <br />the [non 50 <br />No. 200 sieve <br /> PI <a or lots below "A' line ML Silt ' <br /> organic Liquitl limit -oven tlned < 0 75 OL Or anic cla <br /> Liquitl limit -not tlned Or anic sat <br />Silts and Clays Liquitl inorganic PI plots on or above "A" line CH Fat clay ' ' <br />limit 50 <br />or mare <br /> PI lots below "A" line MH Elastic Silt ' <br /> organic LigwO limit -oven tlnetl < 0.75 OH Organic clay ' ' ' <br />' <br /> Li uitl Emit -not oriel LItC~ <br />OrOr am~ <br />W hl or anic soils Pnmaril or anic matter. dark in color. antl or anic odor PT Peat <br />ABased on the matenal passing the 3-in. If soil contains 15 to 29 % plus No. 200. atltl "with <br />175-mm) sieve _ santl' or'Wah gravel", whichever is predominant. <br />elf fieltl sample contained cobbles or t: l Sao I ~If soil contains? 30 % plus N° 200 predominantly <br />bdultlers, or hoth, atltl "with cobbles or co 'Deo ' Dm is santl. atltl "sandy" to grou0 name. <br />boulders, or both" to group name. pro ~ U6J MI(soil contains > 30 % plus No 200. predominantly <br />°Gravels wdh 5 to 12 %fines require tlual gravel. atltl "gravelly" to group name <br />symbols: "PI > 4 and Dlots on or above "A" line. <br />GW-GM well-graded gravel with sdt <br />P °PI <a or plots below "A" line. <br />GW-GC well-gratletl gravel with clay lf soil contains ? 15 % sand, atltl "with sand" to group epl plots on or above "A' line. <br />GP-GM poony grades gravel with sill name. °PI plots below "A' line. <br />GP-GC poony gratletl gravel with clay °If fines classify as CL-M L, use dual symhol GC-GM. <br />°Sands with 5 to 12% fines require dual or SC-SM. <br />symbols: "lf fines are organic, atltl'With organic fines" to grqup <br />SW-SM well-graded sand with silt' name. <br />SW-SC well-graded sand with clay ilf soA contains > 75% gravel. add 'Wth gravel" to <br />SP-SM poony gratletl sand with sill ~roup name. <br />SP-SC poorly gratlea sand with clay If Atterberg limits plat in shaded area, sq~l is a CL- <br /> ML, silty clay. <br />vo i <br />r• <br />i <br /> doe n~ a9 a~".u i~am. op~.o~o~.- <br />~ % ~ <br />: <br />~ ~a~ <br />, . i. ,~~., <br />_ t Pi ~ iNa LL 355 •J/ ~ V <br />~ <br />~ <br />. 'bo ii <br />0.]] ILL - ]0) /~ : <br />-, <br /> r <br />~ <br />o <br /> <br />~ vmmi oL LL - s <br />a . <br />i <br />~ <br />tne. Pi _ a 9 ILL - B) % - N <br />2 <br />~ <br />_ i9 ~ ~ <br /> I /, <br />. <br /> <br />- ~i <br />^ / <br />j.~ <br />~ .fi't` I <br />i //: <br />i ~'~ <br /> ~MH ok OH <br />-~ <br /> .'/ <br />i <br /> eL-NL ML n4 OL <br /> <br /> u4;m UNIT ::, <br /> PnR1~G ON <br />