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UNIFIED SOIL. CLASSIFICATION I'SYSTEX <br /> Major divisions Symbo(s Typical descriptions li Criteria <br /> vett-grade- gravel's and gravel-sand <br /> °>' m; mixtures, Little or no fires SANI3S AND GRANGES <br /> GP Poorly graded gravels and graver! Standard Penetration Test <br /> fin <br /> -sand mixtures, tittle or no ds Penetration <br /> > w c '+ Resistance, N Retativc <br /> C; Q 0 GM Silty gravels, gravel-sand-sift 1M (btows/ft) Density <br /> m e " mixtures l <br /> N E; <br /> m a 0 - 4 Very loose <br /> rn '' u s GC Clayey gravels, gravcE-sand-clay:€ 4 - 10 Loose <br /> - mixtures ' 10 - 30 Medium, Dense <br /> mm <br /> G " 30 - 50 Dense <br /> SW Nell-graded sands and gravelly sands > 50 very Dense- <br /> e-1 ox 0 c m W little or no fines E <br /> e, <br /> o "'• t* !, 4V <br /> w _, m <br /> `e r an 0 v c�H SP Poorly grimed $ends, gravelly sands <br /> u i ,�i little or no-fines <br /> d Y d N i <br /> Sm Silty sand, sand-sitt mixtures t <br /> i <br /> " a '3 H .� SC Clayey sands,sand-clay mixtures <br /> m Inorganic silts, very fine sands r T AN AY <br /> ML rock flour,silty or clayey fine sands CLAY <br /> S D CL $ <br /> CU E O75 <br /> 4 Standard Penetration Test <br /> Inorganic clays of tow to tedium �; Penetration <br /> 0 <br /> `. CL plasticity, gravelly clays, sandy s resistance, H <br /> C3 a '{ clays, silty clays, lean clays E (blow/ft) Comistency <br /> cu <br /> ti o �„ '^'! OL Organic silts and organic silty ctais < Z Very soft <br /> Nof Lou plasticity 2 - 4 Soft <br /> 4 - a Medium Firri <br /> z a x Inorganic silts, micaceous or I. 8 - 15 stiff <br /> C? ; a.:'M HH diatomaceous fine sands or silts } 15 - 30 very stiff <br /> �_ <br /> C E C elastic silts 1 30 Hard <br /> 0 v ` CH Inorganic clays of high plasticity) <br /> o fat clays <br /> L cnon <br /> OH Organic clays of medium to high €� <br /> plasticity <br /> Highly Organic sails PT Peat, muck, and other highly organic 4 <br /> soils !� <br /> i <br /> 3" 3/4" #4 #10 #40 it#200 U.S. standard Sieve <br /> Gravel Sand <br /> Unified CobblesSilt or Clay <br /> Soil Classif. y coarse fine coarse median fine, <br /> Moisture Conditions Mateeia1 Quantity Other Symbots <br /> Ory absence of moisture; dusty, dry to the touch trate 0 - 5 X C Core sample <br /> !� <br /> Slightly moist belouloptimum moisture content for compaction few ! 5 - 10 X S SPT sample <br /> Moist near optimum moisture content som7- ill - 25 X B Bulk sampte. <br /> Very Moist above joptimm moisture content prerix 25 - 45 X Q Ground water <br /> Wet visible free water, below water table <br /> Basic Log format: <br /> Group name, Group Symbol,' (Grain Size), Color, moisture, Consistency or relativeEy density <br /> Additional coaments: odor, presence of roots, mica, gypsum, coarse grained particles, etc_ <br /> e <br /> LLL £xampte: <br /> Sand (SP), fine to medium grain, brown, moist, loost,trace silt, little fine gravel, few cobbles up to <" in size <br /> LEGEND TO LOGS <br /> _ (Sheet 2 OF 2) <br /> E: <br />