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GROUP SYMBOL GROUP NAME <5% fines Cu≥4 and 1≤Cc≤3 GW <15% sand Well-graded gravel ≥15% sand Well-graded gravel with sand Cu<4 and/or 1>Cc>3 GP <15% sand Poorly graded gravel ≥15% sand Poorly graded gravel with sand fines = ML or MH GW-GM <15% sand Well-graded gravel with silt Cu≥4 and 1≤Cc≤3 ≥15% sand Well-graded gravel with silt and sand fines = CL, CH,GW-GC <15% sand Well-graded gravel with clay (or silty clay) GRAVEL (or CL-ML)≥15% sand Well-graded gravel with clay and sand % gravel >5-12% fines (or silty clay and sand) % sand fines = ML or MH GP-GM <15% sand Poorly graded gravel with silt Cu<4 and/or 1>Cc>3 ≥15% sand Poorly graded gravel with silt and sand fines = CL, CH,GP-GC <15% sand Poorly graded gravel with clay (or silty clay) (or CL-ML)≥15% sand Poorly graded gravel with clay and sand (or silty clay and sand) fines = ML or MH GM <15% sand Silty gravel ≥15% sand Silty gravel with sand >12% fines fines = CL or CH GC <15% sand Clayey gravel ≥15% sand Clayey gravel with sand fines = CL-ML GC-GM <15% sand Silty, clayey gravel ≥15% sand Silty, clayey gravel with sand <5% fines Cu≥6 and 1≤Cc≤3 SW <15% gravel Well-graded sand ≥15% gravel Well-graded sand with gravel Cu<6 and/or 1>Cc>3 SP <15% gravel Poorly graded sand ≥15% gravel Poorly graded sand with gravel fines = ML or MH SW-SM <15% gravel Well-graded sand with silt Cu≥6 and 1≤Cc≤3 ≥15% gravel Well-graded sand with silt and gravel fines = CL, CH,SW-SC <15% gravel Well-graded sand with clay (or silty clay) SAND (or CL-ML)≥15% gravel Well-graded sand with clay and gravel % sand ≥5-12% fines (or silty clay and gravel) % gravel fines = ML or MH SP-SM <15% gravel Poorly graded sand with silt Cu<6 and/or 1>Cc>3 ≥15% gravel Poorly graded sand with silt and gravel fines = CL, CH,SP-SC <15% gravel Poorly graded sand with clay (or silty clay) (or CL-ML)≥15% gravel Poorly graded sand with clay and gravel (or silty clay and gravel) fines = ML or MH SM <15% gravel Silty sand ≥15% gravel Silty sand with gravel >12% fines fines = CL or CH SC <15% gravel Clayey sand ≥15% gravel Clayey sand with gravel fines = CL-ML SC-SM <15% gravel Silty, clayey sand ≥15% gravel Silty, clayey sand with gravel GROUP SYMBOL GROUP NAME < 30% plus No. 200 < 15% plus No. 200 Lean clay 15-29% plus No. 200 % sand ≥ % gravel Lean clay with sand Pl > 7 and plots CL % sand < % gravel Lean clay with gravel on or above % sand ≥ % gravel < 15% gravel Sandy lean clay "A"-line ≥ 30% plus No. 200 ≥ 15% gravel Sandy lean clay with gravel % sand < % gravel < 15% sand Gravelly lean clay ≥ 15% sand Gravelly lean clay with sand < 30% plus No. 200 < 15% plus No. 200 Silty clay 15-29% plus No. 200 % sand ≥ % gravel Silty clay with sand 4 ≤ Pl ≤ 7 and CL-ML % sand < % gravel Silty clay with gravel Inorganic plots on or above % sand ≥ % gravel < 15% gravel Sandy silty clay "A"-line ≥ 30% plus No. 200 ≥ 15% gravel Sandy silty clay with gravel % sand < % gravel < 15% sand Gravelly silty clay ≥ 15% sand Gravelly silty clay with sand < 30% plus No. 200 < 15% plus No. 200 Silt LL < 50 15-29% plus No. 200 % sand ≥ % gravel Silt with sand Pl < 4 or plots ML % sand < % gravel Silt with gravel below "A"-line % sand ≥ % gravel < 15% gravel Sandy silt ≥ 30% plus No. 200 ≥ 15% gravel Sandy silt with gravel % sand < % gravel < 15% sand Gravelly silt LL -ovendried ≥ 15% sand Gravelly silt with sand Organic -------------------- < 0.75 OL LL -not dried < 30% plus No. 200 < 15% plus No. 200 Fat clay 15-29% plus No. 200 % sand ≥ % gravel Fat clay with sand Pl plots on or CH % sand < % gravel Fat clay with gravel above "A"-line % sand ≥ % gravel < 15% gravel Sandy fat clay ≥ 30% plus No. 200 ≥ 15% gravel Sandy fat clay with gravel % sand < % gravel < 15% sand Gravelly fat clay Inorganic ≥ 15% sand Gravelly fat clay with sand < 30% plus No. 200 < 15% plus No. 200 Elastic silt 15-29% plus No. 200 % sand ≥ % gravel Elastic silt with sand LL ≥ 50 Pl plots below MH % sand < % gravel Elastic silt with gravel "A"-line % sand ≥ % gravel < 15% gravel Sandy elastic silt ≥ 30% plus No. 200 ≥ 15% gravel Sandy elastic silt with gravel LL -ovendried % sand < % gravel < 15% sand Gravelly elastic silt Organic -------------------- < 0.75 OH ≥ 15% sand Gravelly elastic silt with sand LL -not dried Flow Chart for Classifying Coarse-Grained Soils (More Than 50% Retained on No. 200 Sieve) Flow Chart for Classifying Fine-Grained Soil (50% or More Passes No. 200 Sieve)