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Alpine Drive—Street Improvements <br /> Ramsey,Minnesota <br /> NTI Project No.16.61770.100 <br /> CLASSIFICATION of SOILS for ENGINEERING PURPOSES <br /> ASTM Designation D-2487 and D2488(Unified Soil Classification System) <br /> Major Divisions Group Typical Name Classification Criteria <br /> Symbol <br /> N Well—graded gravels and <br /> -a; GW gravel-sand mixtures,little Cu=D60/D10 greater than 4. <br /> > bLO Cz=(D30)2/(D10 x D60)between 1&3. <br /> or no fines. <br /> > C7 <br /> ai Poorly graded gravels and a <br /> 2 GP gravel-sand mixtures,little Not meeting both criteria for GW materials. <br /> f0 o v or no fines. o <br /> > o z <br /> > Mo v Atterberg limits <br /> v C7 o <br /> C: Silty gravels,gravel-sand- N Atterberg limits <br /> v <br /> -a GM a u below"A"line,or <br /> 0 o ai " silt mixtures. ^ m plotting in hatched <br /> o E •� P.1.less than 4. <br /> r4 = ,� a area are borderline <br /> o o 3 w Atterberg limits <br /> o z C a U = classifications <br /> Clayey gravels,gravel-sand- a` above"A"line <br /> c o > GC requiring use of dual <br /> O Ln clay mixtures. o o with P.I.greater symbols. <br /> v L7 m m than 7. Y <br /> C7 0 Well-graded sands and c .. > a>, <br /> o N a a a Cu=D60/D10 greater than 6. <br /> Nv SW gravelly sands,little or no > n <br /> =s o U fines. w , mo o Cz=(D30)2/(D10 x D60)between 1&3. <br /> V a w (n 0 0 0 p <br /> N > Poorly-graded sands and o z <br /> o T v SP gravelly sands,little or no z °�° .� Not meeting both criteria for SW materials. <br /> � .N <br /> o o fines. .7, Q m <br /> Q <br /> O o z c Q o Atterberglimits <br /> Silty sands,sand-silt o r� ti o Atterberg limits <br /> o0 N SM +, � o below"A"line,or plotting in hatched <br /> v , mixtures. p g <br /> o v 4 <br /> h <br /> less ess tan . <br /> m o area are borderline <br /> N N a Atterberg limits classifications <br /> v Clayey sands,sand-clay R `o o -0 above"A"line <br /> 0 o SC U g Lt o requiring use of dual <br /> V) mixtures. with P.I.>7. symbols. <br /> Inorganic silts,very fine <br /> ML sands,rock flour,silty or o <br /> ai clayey fine sands. <br /> n `0 0 <br /> v0 Inorganic clays of low to a <br /> * o CL medium plasticity,gravelly 2 0 <br /> > o + clays,sandy clays,silty <br /> NE clays,lean clays. = o <br /> n J <br /> 0 <br /> = N R O <br /> o s OL Organic silts and organic U CO <br /> z silty clays of low plasticity. x O <br /> ¢i a) d o <br /> G C <br /> c — <br /> CL Inorganic silts,micaceous > = v c <br /> MH or diatomaceous fine sands '2 a <br /> 0 v or silts,elastic silts. in <br /> iy l6 O <br /> CH Inorganic clays of high O <br /> v N u1 plasticity,fat clays. c' <br /> 0 + J <br /> G n a <br /> Organic clays of medium to <br /> OH -o <br /> s high plasticity. o <br /> J <br /> O <br /> T .0 O O O O O O O <br /> s C: IQ Peat,muck and other v `Y' `V <br /> °D 29 voi Pt highly organic soils. 1! -1 ;!o!ls0ld <br /> = <br /> 0 <br />