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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 and 1 < Cc <3 GW Well-gratled gravel <br />Soils more than 50 % 50 % o! coarse than 5%fines° <br />retained on No. 200 fraction retained on <br />sieve No. 4 sieve <br /> Cu <4 antl/or 1 > Cc> 3 GP Poon ratled ravel <br /> Gravels with Fines Fines classify as ML or MH GM Silty gravel,G,H <br /> more than 12 %fines° <br /> Fines classi as CL or CH GC Cla a ravel ' <br />Sands 50%n or more Clean Sands Less Cu > 6 and 1 <Cc < 3 SW Well-graded sand <br />of coarse fraction than 5 % finesE <br />passes No. 4 sieve <br /> Cu < 6 antl/or 1 > Cc > 3 SP Pootl coded sand <br /> Sands with Fines more Fines classify as ML or MH SM Silty sand ~ ' <br /> than 12%fines° <br /> Fines Classi as CL or CH SC Cla a sand <br />Fine-Grained Sails Silts and Clays Liquitl inorganic PI > 7 and plots on or above "A line CL Lean clay ' ' <br />50 % or more passes limit less <br />the than 50 <br />No. 200 sieve <br /> PI < 4 or lots below "A" line ML Si <br /> organic Liquitl limit -oven dried < 0.75 OL Or anic cla <br /> Li uid lima - not daetl Or anic silt • ' <br />Silts and Clays Liquid inorganic PI plots on or above "A" line CH Fat clay <br />lima 50 <br />or mare <br /> PI lots below "A" line MH Elastic Sill <br /> organic Liquid limit -oven tlnetl < 0.75 OH Or anic cla ' ' <br /> Li uid limit -not tlned O anic silt ' <br />Hi hl or anic soils Primaril or anic matter, dark in color, and or anic ooor PT Peat <br />ABased on Ne material passing the 3-in. If soil contains 15 to 29 % plus No. 200, atld'With <br />(75-mm) sievE~ <br />- sand" or'+with gravel", whichever is predominant. <br />elf field sample contained cobbles or e 1 °io 1 Llf soil wntains? 30% plus No. 200 pretlominandy <br />boulders, or both, add "with cobbles or cP °Dda ' °ro ~~ sand, add "santly" to group name. <br />boulders, or both" to group name. °)o ` °da "'If soil contains> 30 % plus No. 200, predominantty <br />`Gravels with x,. to 12%fines require dual ravel, add "gravelly" to group name. <br />symbols: PI > 4 and plots on or above "A" line. <br />GW-GM well<,7raded gravel with sift °PI < 4 or plots below "A" line. <br />GW-GC well-gratled gravel with clay PIf soil contains ? 15 % sand, add'Vrith sand" l0 group Ppl plots on or above'A" line. <br />GP-GM poony gradetl gravel with silt name. °PI plots below "A" line. <br />GP-GC poody graded gravel with Uay °If fines Uassify as CL-ML, use tlual symbol GC-GM, <br />°Sands wdth 5 to 12 %fines require tlual or SC-SM. <br />symbols: "If fines are organic, add'With organic fines" to group <br />SW-SM wellyraded sand with silt name. <br />SW-SC wellyraded sand with Gay Ilf soil contains > 15 % gravel, add "with gravel" to <br />SP-SM poody graded santl with silt group name. <br />SP-SC poody graded sand with Uay If Atterberg limits plat in shaded area, soil is a CL- <br /> ML, silty day. <br />., r <br /> ="d n" wc~,.d r.:n.~, r ~.o~~ <br />% ., <br />~ <br />~ <br /> yrem.a Ilr I ~~ <br />% <br />_ Hslxon[ar at PI ~ LRto LL - 15.5 rJ V~ <br /> <br />'6~ ~ <br />I <br />: Eo+c6m of '.f- Ind 'I _ <br />venrar m LL- ifi m R~ r <br />t <br />- tnen R - 0: ILL - P) -%. <br />i r <br />~. y <br />~ <br />T <br />F i <br />F <br />- -- __- <br />- <br />~- - __ - _- _ <br />_ _--_ <br />~ ~ <br />~ ~ <br />- ~ '.L~H ~F CH'. <br />i I <br /> i <br /> i ... __ .. ~.. -.. r. ~ r. <br /> :;%1~1C Lli„IT ~; i.L1 <br /> P~1R~1G ON <br />