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Key To Bo ing o s <br /> GRpUP 6ECONDAAY DIVISIONS <br /> PFiIiVIAfiY pr„iS10rV5 svrNl30l <br /> CLEANWall goaded gra-.els,p,atiel-s" rnrrtwes.I.II[r at no <br /> GRAVELS GRAVELS GW fines <br /> m <br /> MC>F1E THAN HALFt1055 THAN �F Poorly p,adrd grav�la or gra„el-sand mi.tures,lrtlta a <br /> OF COARSE 514 FINES; +so ♦roes. <br /> NFAAGTdON IS G0.AvEl GM Silty grovels.gravel-sand-sill mialtres.non-plastic fire <br /> UD F LARGER THAN WITH <br /> z w 4 - NO. 4 SIEVE FES GC Clayey grovels, grsvel-aand-clay mi,lures. Plast c lines. <br /> in <br /> CLEAN <br /> X SANDS SANDS SW Well graded Sands, gravelly sands,fillle cc rro fines, <br /> W ti MORE THAN KAUS ELESS THAN <br /> V) rs% FINES) S R Poorly graded Lands or gravelly sands,tittle n <br /> or o fines. <br /> J OF COARSE <br /> w N FRACTION IS SANDS SM Silty sands,sand-silt rnistures,non-plastic fines, <br /> SMALLER THAN WITH <br /> NO. 4 SIEVE FINES SC Ctayey sands,sand-Clay mistt,res,ptartic fines. <br /> '—X <br /> SILTS <br /> Silts and Very fin sands,rock flour,silty w <br /> w SILTS AND CLAYS ML X;ey fine .,,ds.or CLayey silts wth st ght plasticity, <br /> O J <br /> J Ir+or anie etay5 of tow to medium plasticity,gravelly <br /> LIQUID LIMIT 1S C L c�sys,I& y clays.gAry cloys,kin clays. <br /> a vs LESS THAN 50% AL OrgarirC tilts and OrganC silty days of low p[asGcity, <br /> � #A Q <br /> N SILTS AND CLAYS MH Ina ane s�lrs,tri,eaCesilts or diatomaceous fire tsrsdy a <br /> � �ilry sells,elastic silts. <br /> Lu W <br /> f„ LIQUID LIMIT IS CH inorganic clays of high PTaslicily.W ctsys- <br /> ul 15 <br /> z GREATER THAN 50% <br /> OH OrganeC clays of meCium to high prasQcity,agank silts. <br /> HIGHLY ORGANIC SOILS Pt Peat and other highly Organic sails. <br /> DEFINITION OF TERMS <br /> U.S. STANOo.RD SERIES SIEVE CLEAR SQUARE SIEVE OPENINGS <br /> < 200 40 10 4 3/4" 3" <br /> SAND GRAVEL <br /> SILTS AND CLAYS C06BLES BOULDERS <br /> FINE MEDIUM COARSK FINE C64115E <br /> GRAIN SIZES <br /> SANDS AND GRAVELS BUMS/FOOT SILTS AND CLAYS STRENGTH BLOWS/FOOTf <br /> VERY LOOSE 0- 4 VERY SOFT 0 - 1/4 0 - 2 <br /> SOFz 1/4 - til 2 - 4 <br /> LOOSE 4 - FIRM !/! - 1 4 - 8 <br /> MEDtum DENSE 10 -30 STIFF 9 - 2 8 - 16 <br /> DENSE 30 -50 VERY STIFF 2 4 16 -32 <br /> VERY DENSE pdER 50 kARD OVER 4 OVER 32 <br /> RELATIVE DENSITY CONSiSTfNCY <br /> *Number of brows of 140 pourw fymmer f,n:ng 30 kiches to drive a 2 ir+ch O.D.i1-3/8 kvtl 1.01. <br /> April apa'on UNIFLO S�0_IL CLASSIFICATION SYSTEM <br /> Soil sample, not retained ® Soil sample, not recovered <br /> Soil sample, retained4or <br /> analysis <br /> Soil Color derived from -the HUNSELL Sail Color Charts <br />