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Sunwood 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 ai <br /> v GW gravel-sand mixtures,little Cu=D60/D10 greater than 4. <br /> > Cz=(D30)2/(D10 x D60)between 1&3. <br /> U a) or no fines. <br /> ra > L7 <br /> Poorly graded gravels and a <br /> a v GP gravel-sand mixtures,little Not meeting both criteria for GW materials. <br /> � v <br /> 0 0 or no fines. o <br /> > u Z <br /> > o v ? Atterberg limits <br /> v O v o c Silty gravels,gravel-sand- :N Atterberg limits <br /> -a GM a- u below"A"line,or <br /> 0 o v " silt mixtures. N plotting in hatched <br /> o •� u P.I.less than 4. <br /> r4 ,� = �, m area are borderline <br /> 6 o v 3 v ' c Atterberg limits <br /> — z c n- u classifications <br /> o o Clayey gravels,gravel-sand- m above"A"line <br /> c o > GC w requiring use of dual <br /> O Ln clay mixtures. o o with P.I.greater symbols. <br /> v (D `° than 7. y <br /> C7 Well-graded sands and c > a> <br /> a) lu <br /> SW gravelly sands,little or no u > -- N Cu=D60/D10 greater than 6. <br /> — _0 y °' o 0o Cz=(D30)2/(D10 x D60)between 1&3. <br /> 0 0 u c fines. Q0 o ,,, <br /> u � v) po 60 <br /> > Poorly-graded sands and v_i 6 z m <br /> •T) °1 SP gravelly sands,little or no z c N Not meeting both criteria for SW materials. <br /> o a u fines. @ o <br /> a <br /> Ln . ? c a N o Atterberg limits Atterberg limits <br /> Silty sands,sand-silt p N ti g <br /> o0 SM ;, n O below"A"line,or lotting m hatched <br /> r = mixtures. @ P g <br /> Q 3 w <br /> ru <br /> @ Y o N P.I.less than 4. area are borderline <br /> c 7A _�] m Atterberg limits classifications <br /> v c: LL Clayey sands,sand-clay m o o above"A"line <br /> O n SC mixtures. v LL o requiring use of dual <br /> with P.I.>7. symbols. <br /> Inorganic silts,very fine <br /> ML sands,rock flour,silty or o <br /> v clayey fine sands. <br /> o O <br /> o)v 0 Inorganic clays of low to a = <br /> o CL medium plasticity,gravelly co <br /> O <br /> a) clays,sandy clays,silty <br /> v E clays,lean clays. = o <br /> 0 <br /> N R O <br /> 6 s OL Organic silts and organic U CO <br /> z silty clays of low plasticity. x o <br /> of v a) o <br /> G n C 7 <br /> CL O :T <br /> Inorganic silts,micaceous _ <br /> o MH or diatomaceous fine sands a <br /> o °1 or silts,elastic silts. u) <br /> n � R o <br /> v v a m <br /> �� o CH Inorganic clays of high _ <br /> N u7 plasticity,fat clays. - N <br /> + J <br /> In -0 <br /> a E - <br /> Organic clays of medium too <br /> OH - <br /> s high plasticity. <br /> J a <br /> O <br /> > u O O O O O O O <br /> t c: D Peat,muck and other CO "' v m N <br /> °0 Ln Ln Pt highly organic soils. 1!-!-1�!�!aSeld <br /> = <br /> 0 <br />