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UNIFIED SOIL CLASSIFICATION SYSTEM ASTM Designations: D 2487, D2488 Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests" Group Svmbol Soil Classification Group Name Coarse -Grained Gravels Moro Clean Gravels Cu>4 and 1<Cc<3 GW Well graded gravel Soils More than 50016 coarse Less than 5% than 50% fraction retained frnese Cu<4 and/or I>Cc>3 GP Poorly graded gravel retained on on No. 4 sieve No. 200 sieve Gravels with Fines classify as ML or MH GM Silty gravel Fines more than 12% fines c Fines classify as CL or CH GC Clayey gravel Sands 50%or Clean Sands Cu>6 and I<Cc<3` SW Well -graded sand' more of coarse Less than 5% fraction passes fines Cu<6 or 1>Cc>3 SP Poorly -graded San No. 4 sieve Sands with Fines classify as ML or MH SM Silty sand Fines more than 12%fines o Fines classify as CL or CH SC Clayey sand Fine -Grained Silts and Clays inorganic PI>7 and plots on or above CL Lean cla Soils 50%or Liquid limit less "A" liner more passes than 50 PI<4 or ?lots below ML Sil the No. 200 "A" line sieve organic Liquid limit-ovn dried m.7s OL Organic cl (see Plasticity Liquid limit —not dried Organic sih--"to Chart below) Silts and Clays inorganic PI plots on or above "A" line CH Fat cla Liquid limit 50 or more PI plots below "A" line MH Elastic sil organic Liouid limit --oven dried <o,7S OH Organic cla liquid limit —not dried Organic sih-"Q Highly organic Primarily organic matter, dark PT Pea soil in color, and organic in odor SIM AN'u vats F" a. a.r}—s.."^..—� ■ AMERICAN ENGINEERING 13 TESTING, INC. Notes "Based on the material passing the 3-in V5-min) sieve. If field sample contained cobbles or boulders, or both, add "with cobbles or boulders, or both" to group name. cGravels with S to 12% fines require dual symbols: GW-GM well -graded gravel with silt GW-GC weH-graded gravel with clay GP -GM poorly graded gravel with silt GP -GC poorly graded gravel with clay °Sands with 5 to 12% fines require dual symbols: SW-SM well -graded sand with silt SW -SC well -graded sand with clay SP-SM poorly graded sand with silt SP-SC poorly graded sand with clay (Dw)2. ECu = D6o /Dio, Cc- Diox Dw FIf soil contains >15% sand, add "with sand" to group name. olffines classify as CL-MI, use dual s7mbol GC -GM, or SC-SM. If fines are organic, add -with organic fines" to group name. 'if soil contains >15% gravel, add "with ravel" to group name. If Atterberg limits plot is hatched area, soils is a CL-ML silty clay. xIf soil contains 15 to 294/6 plus No. 200 add "with sand" or "with gravel", whichever is predominant. LIf soil contains >30% plus No. 200, predominantly sand, add "sandy" to group name. MY soil contains >30% plusNo.200, predominantly gravel, add "gravelly" to group name. 8PI>4 and plots on or above "A" line oPl<4 or plots below "A" line. PPI plots on or above "A" line. QPI plots below "A" line. RFiber Content description shown below • . I a u .1 0 10 ti io n 40 x a) M a 1 to PAInteLE &M N MLLtAErEA6 UOUDMIT (Ly 20 u Plasticity Chart ADDMONAL TERMWOLOGY2NOTES:USED BY,AETFOR SOIL`IDENTIFICA-TION AND DESCRIPTION. Grain Size Term Panicle Sint Gravel Pmtritaees Term Percent Consistcncv of Plastic Soils Relative Density of Non -Plastic Soils Term N-Value, BPF Term N-Value. BPF Boulders Over 12" Cobbles 3" to 12" Gravel #4 sieve to 3" Sand #200 to #4 sieve Fines (silt & clay) Pass #200 sieve A Little Gravel 3% -14% With Gravel 15%- 29% Gravelly 30Yo - Yr/o Very Soft less than 2 Soft 2-4 Firm 5-8 Stiff 9 - 15 Very Stiff 16 - 30 Hard Greater than 30 Very Loose 0-4 Loose 5 - 10 Medium Dense 11 - 30 Dense 31 -50 Very Dense Greater than 50 Alnicture/Frost Condition (MC Column) D (Dry): Absense of moisture, dusty, dry to touch. M (Moist): Damp, although free water not visible. Soil may still have a high water content (over "optimum"). Laverine Notes Laminations: Layers less than W thick of differing material or color. Lenses: Pockets or layers Fiber Content of Peat Fiber Content Term (Visual Estimate) Fibric Peat: Greater than 67% Hemic Peat: 33 — 67% Sapric Peat: Less than 33% Organic/Roos Description (if no lab tests) Soils are described as organicif soil is not peat and is judged to have sufficient organic fines content to influence the soil properties. !,s ightly onzanic used for borderline cases. With roots: Judged to have sufficient quantity W (Wet/ Free water visible intended to greater than h" Waterbearing): describe non -plastic soils. thick of differing Waterbearing usually relates to material or color. sands and sand with silt F (Frozen): Soil frozen of roots to influence the soil properties. Trace roots: Small roots present, but not judged to be in sufficient quantity to significantly affect soil properties. O1CLS021(2/04) AMERICAN ENGINEERING TESTING, INC.