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PRIMARY DIVISIONS GROUP SECONDARY DIVISIONS <br /> SYMBOL <br /> GRAVELS CLEAN GW Well graded gravels, gravel-sand mixtures, little'orno <br /> GRAVELS fines <br /> u] MORE THAN HALF OF (LESS THAN 5% <br /> m Sy THE COARSE FRACTION FSS) GP Poorly graded gavels or gravel-sand mixtures,little or no <br /> IS LARGE THAN NO.4 fines. <br /> L SIEVE <br /> N GRAVEL WI'T'H GM Silty gravels,gravel-sand-silt mixtures,non-plastic es. <br /> w o'C? <br /> FINES fin <br /> z GC Clayey gavels,gravel-sand-clay mixturm plastic fines. <br /> 2 SANDS CLEAN SANDS SW Well graded sands,gravelly sands,little or no fines. <br /> uW (LES S TI IAN 51% —• <br /> Q MORE THAN HALF OF Paw) SP Poorly graded sands or gravelly sands,little or no fuics. <br /> O O COARSE FRAC17014 IS <br /> U :z SMALLER THAN NO.4 SANDS WITH 5144 Silty sands,sand-silt mixtures,non-plastic fme-S. <br /> SIEVE - FINES -- ---- <br /> "SC Clayey sands,sand-clay mixdures,plastic fines. <br /> ILTS AND CLAYS A41. Inorganic silts and very fine ssnds,rock-flour,silty or clayey <br /> s fuze sands or clayey sills with slight plasticity. <br /> LIQUID LLtiII.T IS LESS THAN SO^/o <br /> g CL Inorganic clays of low to medium plasticity,gravelly clays, <br /> PRw o sandy clays,silty clays,Iean clays. <br /> z <br /> qOL Organic silts and orgastic silty clays of low plasticity. <br /> .-i — — <br /> aJ, SILTSAND CLAYS MH Inorganic silts,micaceous or diatomaceous fuze sandy or <br /> U silty soils,elastic silts. <br /> tou `4> LIQUMLWIT IS G _T <br /> REAR THAN 5o% <br /> H CII Inorganic clays of high plasticity,fat clays. 1 <br /> OH Organic clays of medium to high plasticity,organic silts. <br /> 13TGHLX ORGANIC SOILS Pt Peat and other bigtzly organic soils. <br /> DEFINITION OF TERMS <br /> U.S.STANDARD SERIES SIEVE CLEAR SQUARE STEVE OPENINGS <br /> 200 40 p 0 4 3/4" <br /> SILTS AND CLAYS SAND GRAVEL COBBLES BOULDERS t <br /> N1NL+ MIIDIL'13 COARSE FJNE COARSE <br /> GRAIN SIZES <br /> SANDS,GRAVELS AND SLOWS/FOOT( CLAYS AND STRENGTH' HI OWS/FOOT1 <br /> iN'ON-PLASTIC SILTS PLASTIC SILTS <br /> VERY LOOSE 0-4 VERY SOFT 0-1/4' 0-2 <br /> LOOSE 4-10 SOFT 1/4-1/2 2-4 <br /> MEDIUM DENSE 10.30 FIRM 1/2-1 4-8 <br /> DENSE 30-50 STIFF 1-2 8-16 <br /> VERY DENSE OVER 50 VERY STIFF 2-4 16-32 <br /> BARD OVER 4 OVER 32 <br /> RELATIVE DENSITY <br /> CONSISTENCY <br /> INuntber of blows of 140 pound hammer falfing 30 inches to drive a 2 inch O.D.(1-3/8 inch I.D.)split spoon(ASTM D-1586). <br /> -Uhcenfined compressive strength in tons/squam foot as determined by laboratory testing or approximated by the standard <br /> penetration test(ASTM 13-1586),pocket pewtrotneter,torvane,or visual observation. <br /> I <br /> ALTA ERl1 INC: UNIFIED SOIL CLASSIFICATION SYSTEM <br /> Expert Environmental Solutions <br />