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'i <br />.I <br />.~ <br />.' <br />~I <br />~I <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />Cdtede for Assigning Group Symbols and Group Names Using Laboratory Test! <br />Coarse-Grained Gravels more than Clean Gravels Less C <br />4 <br />d <br />' <br />Soils more than 50% of coarse than 5% [ines° u > <br />an <br />i < Cc <3 <br />50% retained on fraction retained on <br />No. 200 sieve No. 4 sieve Cu < 4 andlor 1 > Cc > J` <br /> Gravels with Fines <br />more than [ 2% (ines° Fines classic as ML or MH <br />y <br /> FneS classify as CL or CH <br /> Sands 50% or more Clean Sands Less Cu > 6 and 1 < Cc < 3E <br /> at coarse traction then 5% finesE <br /> passes No. 4 sieve Cu < 6 andlor 1 > Cc > 3E <br /> Sands with Fines Fines classify as ML or MH <br /> more then 12% (ines° <br /> fines Classify as CL gr CH <br />Fine-Grainetl Soils Silts and Clays inorganic PI > 7 and plots on or above 'Aline' <br />50°b or more Liquid limit less <br />passes the than 50 PI < 4 or plots below 'A' fine' <br />No. 200 sieve <br /> organic Liquid limit -oven dried <br /> < 0.75 <br /> Liquid limit - no[ dried <br /> Silts and Clays inorganic PI plots on or above 'A' I~ne <br /> Liqurd limit 50 <br /> or more PI lots below 'A" I~ne <br /> organic Liquid limit -oven dried <br />Liquid limit -not dried <br />dark in color. and organic odor <br />ABased on the material passing the 3~in. <br />s •`~°n10JDr, Cc ° <br />°I <br />If hold <br />ample contained cobbles or Die <br />pra <br />boulders, or bath, add 'with cobbles or <br />boulders, or both' to group name. <br />°Gravels with 5 to 12% tines require dual 'If soil contains > 15% sand, add 'with <br />symbols: sand' to group name. <br />GW-GM well-graded gravel with silt °IF Fines classify as CL-ML, use dual symbol <br />GW-GC well-graded gravel with clay GC-GM, or SC-SM. <br />GP-GM poorly graded gravel with silt "It tines are organic, add "with organic fines' <br />GP-GC poorly graded gravel with clay to group name. <br />°Sands with 5 to 12% fines require dual 'If soil contains > 15% gravel, add 'with <br />symbols: gravel' to group name. <br />SW-SM well-graded sand with silt rlf Atterberg limits plot in shaded area, soil is <br />SW-SC well-graded sand with clay a CL-ML, silty clay. <br />SP-SM poorly graded sand with silt <br />SP-SC poorly graded sand with clay <br />m <br />a. m <br />p <br />(~ <br />Z b <br />U <br />S° <br />S <br />0. <br />~° <br />Group <br />Symbol <br />GW <br />GP <br />GM <br />GC <br />SW <br />SM <br />SC <br />CL <br />OL <br />CH <br />MH <br />Classificetlon <br />Group Name' <br />Well-gradetl gravel' <br />Poorly graded grave <br />Silty gravel,G.H <br />Clayey gra vel`~0x <br />Well graded sand' <br />Pqgrly gradetl sand' <br />Silty sand°"' <br />Clayey sand°M'' <br />Lean clav'~"' <br />Organic clay`~~"" <br />Organic silt""° <br />Fat cfay'~`" <br />Elastic Sill`'"' <br />Organic clay' c "' <br />Organic silt''"''0 <br />< 0.75 OH <br />Pi Peat <br />slf soil contains 15 to :'9% plus No. 200, add <br />'with sand' or 'with gravel', whichever is <br />predominant. <br />`If sail contains > 30% plus No. 200 <br />predominantly sand, add 'sandy" to group <br />name. <br />Wf soil contains > 30°x, plus No. 200, <br />predominantly gravel, add 'gravelly' to group <br />name. <br />"PI > 4 and plots on or above 'A' line. <br />°PI < 4 or plots below 'A' line. <br />'PI plots on or above 'P.' line. <br />°PI plots below'A' line. <br />r« r ."n..xw ., ,w.~,ew.a du <br />. <br />em n <br />.va~.m.° rna~.° er e.°,..- <br />°,sw° <br />4. .. <br />Ewan. er '~ _ w \~ <br />~' <br />J t- <br />~~ <br />xonroma m n .. m u Ps <br />v~ R - °.)) ILL - ag7 .~~ ~ <br />• , P <br /> O <br />Ewna .~ V - rM ~a <br /> <br /> Q~ <br /> R <br /> . ' ~ <br />G~. <br /> MH O R OH <br /> <br /> <br /> <br />0 <br />o .o it m w w w e° ro e° w iw i~c <br />[7QU10 UNIT (LL) <br />Empire Laboratorie:~, Inc. <br />A Division of The Terracon ComGanies, Inc. <br />~. <br />