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CLASSIFICATION OF SOILS ASTM DESIGNATION: 02487-83 (Based on Unified Soil Classification System) CRITERIA FOR ASSIGNING GROUP SYMBOLS AND GROUP NAMES" SOIL CLASSIFICATION MAJOR DIVISIONS Group Symbols TYPICAL NAMES" f GRAVELS CLEAN GRAVELS GW I Well graded gravel,E gravel-sand mixture (More than 501/o (55%fines)° GP I Poorly graded gravel,E gravel-sand mixture of coarse fraction is larger GRAVELS WITH COARSE than the No. 4 GM Silty gravel,EF.a gravel-sand-sift mixture GRAINED sieve size) FINES SOILS 12%fines)' GC Clayey gravel,(Z ) y y g gravel-sand-clay mixture (More than 50%of material I SW Well araded sand,"gravelly sand is larger than CLEAN SANDS No. 200) SANDS (Mare than 50°6 (55%fines)" SP I Poorly graded sand,"gravelly sand of coarse fraction is smaller than SANDS WITH SM I Silty sand,F'-"sand-silt mixture the No. 4 sieve FINES size) (212%fines)' SC Clayey sand,','-"sand-clay mixture Lean clay,','.'inorganic clay of low-medium CL plasticity,gravelly clay, sandy clay,silty day Inorganic SILTS &CLAYS Silt''K and very fine sand, rock flour, silty ML or clayey fine sands or clayey silts with FINE GRAINED (Liquid limit <50) slight plasticity SOILS Organic OL Organic ciay','-K of low plasticity organic Silt WX of low plasticity (More than 50% of material is I CH Fat clay,'^'•'inorganic clay of high plasticity smaller than No.200 sieve SILTS &CLAYS Inorganic size) MH Elastic sift,'-'•K inorganic sift, micaceous or (Liquid limit>50) diatomaceous fine sandy of silty soils Organic OH Organic clay'All of medium to high plasticity organic silt 1.1-K Highly Organic Soils I PT Peat and other highly organic soils A Based on the material passing the 3-in(75-mm)sieve. E If soil contains 215%sand,add'with sand'to group name. B If field sample contained cobbles or boulders,or both,add F If fines ciassity as CL-ML.use dual symooi GC-GM,or SC-SM. 'with copies or boulders,or both'to group name. G If fines are organic.add with organic fines"to group name. C Gravels with 5 m 12%fines require dual symbols: GW-GM we11-graded gravel with silt H If soil contains 215%gravel, add with gravel-to group name. GW-GC we14-graded gravel with day GP-GM poorly graded gravel with silt I If soil contains 15 to 29%plus No.200,add"with sand'or`with GP-GC poorly graded gravel with day gravel.'whichever is predominant. D Sands with 5 to 12%fines require dual symbols: J If soil contains 230%plus No.200,predominantly sand,add'sandy" SW-SM well-graded sand with ailt m group name. SW-SC well-graded sand with day SP-SM poorly graded sand with silt K If soil contains 230%plus No.200,predominantty gravel,add SP-SC poorly graded sand with day 'gravelly'to group name.