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tive proportions <br />■ fw* 0 - 10% <br />tom# 1 1 _ 20% <br />over 20% <br />DRGANIC CONTENT <br />b% <br />10% <br />?5% <br />SS% <br />non to slightly organic <br />slightly organic <br />organic <br />mock <br />P«at <br />OILS WITH <br />|%CLAY <br />gfitty, cannot thread <br />rough to smooth^ <br />^ard to thread <br />smooth to waxy, <br />?asy to thread <br />n.% <br />(ration, % <br />al Friction <br />mpressive Strength <br />s unless noted other- <br />^ logs. Standard <br />rgers. Soil classification <br />before somewhat <br />depth from eirhich <br />cation System <br />onditions, site <br />TW indicates thin* <br />value. The sampler <br />3unted for secortd <br />•ported in the <br />I not required. <br />i-''' 'A '■" <br />UNIFIED SYSTEM <br />Classification of Soils for Engineering Purposes <br />ASTM Designation D-2A87 <br />Typical <br />Names <br />Well-graded gravels and <br />gravel-sand mixtures, <br />little or no fines <br />Classification Criteria <br />Poorly graded gravels and <br />gravel-sand mixtures, <br />little or no fines <br />-------------- <br />Greater than 4 <br />Between 1 and 3 <br />i/% <br />*o <br />c *8 <br /><=> <br />Not meeting both criteria for CV <br />«A <br />01 <br />•I— I/I <br />•M <br />fOr^ <br />U «o <br />Clayey gravels, gravel- <br />sand-clay mixtures <br />Well-graded sands and <br />gravelly sands, little <br />or no fines <br />Atterberg limits plot <br />pus"fic?;;i„"5er <br />ni:.? classifications re- <br />Dla^tirff ^-”5 quiring use of dualplasticity index syiribols <br />S" • '.han 7 <br />o <br />-r- <br />4- .f <br />Ul H- <br />Oi o «a <br />COP- 01 <br />o M <br />^ ^ 01 <br /><OCO C Oi <br />■» *p* cs - - <br />s. <br />SL <br />01a% <br />fO <br />4-» <br />•S 3 <br />«i 1. cr <br />4- <br />O <br />Poorly graded sands and <br />gravelly sands, little <br />or no fines <br />'80^^10 <br />= -lEzoll <br />Greater than 6 <br />Between 1 and 3 <br />l/l <br />Of <br />XI <br />Not meeting both criteria for SV <br />Silty sands, sand-silt <br />mi xtures <br />Atterberg limits plot <br />below "A" line or <br />I I I• gi Io> > I > V e <br />V -I- ! <br />’r- I/I 01 <br />I/I > <br />_ O 01 <br />C OO-r- <br />O O CVI I/I <br />_ CM <br />S • c>o <br />- 02CCM <br />u <br />ni.c.i i. Atterberg limits plot <br />fhan*^4^^^^ hatched area <br />I/I • <br />I/I in o in ID z <br />4- IP CL <br />Q. I/I <br />in <br />bO CM •« <br />to rH IX <br />in <br />in <br />«d <br />Clayey sands, sand-clay <br />mixtures <br />------n--T_______sre borderline clas- <br />stflcatlons requirinj above A line and use of symbols 55-^ <br />M <br />Jil <br />Inorganic silts, rock <br />flour, silty or clayey <br />fine sand <br />plasticitjj in^xgreater than 7 <br />^ a ms Min <br />^n^ganic crayT^TovTIo <br />median plasticity, grav­ <br />elly clays, sandy clays, <br />A-Tl^y clays, lean c 1 ays <br />Organic silts and organic <br />silty clays of low <br />plasticity <br />60 <br />50 <br />Inorganic silts, micaceous <br />or diatomaceous silts, <br />elastic silts <br />H <br />40 e <br />^ 30 <br />Inorganic clays of high <br />plasticity, fat clays <br />Organic clays of medium <br />to high plasticity <br />'8 <br />aJ <br />4 <br />0 <br />Ptesttevty chax*t [ T <br />clccaxfication of <br />ecils a,id fine frcction <br />o/^cc.f:-siKed soils. <br />cu-ca era lordurHna <br />2cetficatioK8 recuirine <br />>*»e of dual eynbols. <br />Eruaiion of A-lina-r-' <br />Pi » O.PS fU.20i <br />Liquid limit <br />Pc at, iiiuck and other <br />highly organic soils Visual-manual identification <br />ENGINEERINf^ tpctim/. <br />r «A <br />h * <br />R <br />( <br />% <br />i :f <br />V <br />m <br />. V* <br />-If <br />\ <br />X <br />rr' <br />7 <br />Mg <br />A'* <br />H|g