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Lake Front <br />Ramsey, Minnesota <br />NTI Project No. 18.MSP05470.000 <br />CLASSIFICATION <br />OF SOILS FOR ENGINEERING PURPOSES <br />ASTM Designation D-2487 and D2488 <br />(Unified Soil Classification System) <br />GroupSymbol <br />Major Divisions <br />Typical Name <br />Classification Criteria <br />N <br />Well -graded gravels and <br />N <br />= <br />Cu D60 / D10 greater than 4. <br />a <br />GW <br />gravel -sand mixtures, little <br />Cz = (D30)2 / (D10 x D60) between 1 & 3. <br />or no fines. <br />a <br />Poorly graded gravels and <br />N .V <br />a� <br />GP <br />gravel -sand mixtures, little <br />N <br />Not meeting both criteria for GW materials. <br />`� 0 c <br />o <br />U <br />or no fines. <br />o <br />a� <br />> z <br />0 <br />o <br />Atterberg limits <br />.N <br />GM <br />Silty gravels gravel -sand- <br />N <br />U N <br />Atterberg limits <br />below A line, or <br />00 <br />0 ( <br />_ <br />PE <br />silt mixtures. <br />"' <br />� <br />plotting in hatched <br />P.I. less than 4. <br />N <br />N <br />- o <br />o 4- <br />a <br />•� <br />�' "? "? c <br />area are borderline <br />Atterberg limits <br />classifications <br />`� � <br />o <br />�, <br />°' <br />GC <br />Clayey ravels, gravel -sand- <br />y y g <br />�, <br />� <br />above "A" line <br />requiring use of dual <br />0 <br />Ln <br />L <br />clay mixtures. <br />� . <br />o o <br />with P.I. greater symbols. <br />y <br />than7. <br />�7 U <br />o <br />SW <br />Well -graded sands and <br />little <br />c .. > a <br />a� a� <br />"' <br />Cu = D60 / D10 greater than 6. <br />�; <br />+� <br />gravelly sands, or no <br />i a', o <br />o <br />Cz - (D30)2 / (D10 x D60) between 1 & 3. <br />o <br />O <br />fines. <br />CL Ln o 0 <br />OO N <br />U <br />Q; a <br />V) <br />Poorly -graded sands and <br />H `. z14 ° z <br />c� <br />o•° <br />v <br />SP <br />gravelly sands, little or no <br />._to <br />C •N <br />Not meeting both criteria for SW materials. <br />Q) <br />o <br />-0 � -tzt <br />fines. <br />V <br />C r <br />N � <br />o z <br />V <br />Silty sands sand -silt <br />0 <br />c 0- � � �' <br />N o <br />o o N r, <br />Atterberglimits <br />Atterberg limits <br />g <br />"A" <br />Ln V <br />V <br />�., <br />SM <br />mixtures. <br />° <br />below line, or plotting in hatched <br />•� N <br />o N <br />`f' <br />P.I. less than 4. area are borderline <br />Clayey sands, sand -clay <br />° <br />v, = <br />ca a o o 4- <br />Atterberg limits <br />g classifications <br />above "A" line <br />5 <br />ra <br />cn <br />SC <br />mixtures. <br />u J ° <br />requiring use of dual <br />with P.I. > 7. <br />symbols. <br />Inorganic silts, very fine <br />ML <br />sands, rock flour, silty or <br />N <br />a) <br />clayey fine sands. <br />N 0 <br />vInorganic^ <br />clays of low to <br />�..� 1 <br />— <br />C: 0> <br />CL <br />medium plasticity, gravelly <br />�_ <br />clays, sandy clays, silty <br />0 <br />+1 E <br />clays, lean clays. <br />Ln <br />O <br />V) <br />O <br />CT <br />cn6 <br />OL <br />Organic silts and organic <br />Ln <br />silty clays of low plasticity. <br />0� <br />�= cn <br />N <br />Q <br />Inorganic silts, micaceous <br />o <br />MH <br />or diatomaceous fine sands <br />Ln <br />r <br />or silts, elastic silts. <br />U N <br />-0 o <br />Inorganic clays of high <br />Ln <br />plasticity, fat clays. <br />50 <br />L <br />v 1 <br />Organic clays of medium to <br />J <br />OH <br />high plasticity. <br />Peat, muck and other <br />,� <br />CLO�'D unn <br />Pt <br />highly organic soils. <br />0 <br />0 <br />0 <br />0 <br />rn <br />J <br />J <br />� <br />