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Brookview Estates Reconstruction <br />Ramsey, Minnesota <br />NTI Project No. 18.MSP06855.000 <br />CLASSIFICATION of SOILS for ENGINEERING PURPOSES <br />ASTM Designation D-2487 and D2488 (Unified Soil Classification System) <br />Major Divisions <br />Group <br />Symbol <br />Typical Name <br />Classification Criteria <br />Course Grained Soils <br />Fine Grained Soils <br />More than 50% retained on No. 200 sieve * <br />More than 50% passes No. 200 sieve * <br />0 <br />N <br />50% or more of coarse fraction <br />More than 50% of coarse fraction <br />retained on No. 4 sieve. <br />passes No 4 sieve. <br />L <br />4-0 <br />00 <br />= o <br />JT <br />Clean Sands <br />73 <br />Well —graded gravels and <br />GW gravel -sand mixtures, little <br />or no fines. <br />Poorly graded gravels and <br />GP gravel -sand mixtures, little <br />or no fines. <br />GM <br />GC <br />Silty gravels, gravel -sand - <br />silt mixtures. <br />Clayey gravels, gravel -sand - <br />clay mixtures. <br />Well -graded sands and <br />SW gravelly sands, little or no <br />fines. <br />Poorly -graded sands and <br />SP gravelly sands, little or no <br />fines. <br />SM <br />SC <br />Silty sands, sand -silt <br />mixtures. <br />Clayey sands, sand -clay <br />mixtures. <br />Inorganic silts, very fine <br />ML sands, rock flour, silty or <br />clayey fine sands. <br />CL <br />OL <br />Inorganic clays of low to <br />medium plasticity, gravelly <br />clays, sandy clays, silty <br />clays, lean clays. <br />Organic silts and organic <br />silty clays of low plasticity. <br />Inorganic silts, micaceous <br />MH or diatomaceous fine sands <br />or silts, elastic silts. <br />CH <br />OH <br />Pt <br />Inorganic clays of high <br />plasticity, fat clays. <br />Organic clays of medium to <br />high plasticity. <br />Peat, muck and other <br />highly organic soils. <br />o° <br />c <br />0 <br />0 <br />ro <br />0 <br />a v <br />m <br />U <br />CDv co = <br />c 0- v <br />O 2 o <br />v CO0o <br />4 v > <br />> <br />ai v in <br />i O <br />0 <br />C. O ON <br />ON oo Z <br />z °° E <br />co 0• <br />• o• T, co 0_ <br />ns N <br />-0 <br />ci <br />cn <br />co <br />Cu = D60 / D10 greater than 4. <br />Cz = (D30)2 / (D10 x D60) between 1 & 3. <br />Not meeting both criteria for GW materials. <br />Atterberg limits <br />below "A" line, or <br />P.I. less than 4. <br />Atterberg limits <br />above "A" line <br />with P.I. greater <br />than 7. <br />Atterberg limits <br />plotting in hatched <br />area are borderline <br />classifications <br />requiring use of dual <br />symbols. <br />Cu = D60 / D10 greater than 6. <br />Cz = (D30)2 / (D10 x D60) between 1 & 3. <br />Not meeting both criteria for SW materials. <br />Atterberg limits <br />below "A" line, or <br />g Y o N P.I. less than 4. <br />c E Atterberg limits <br />o o above "A" line <br />J " 0 with P.I. > 7. <br />Atterberg limits <br />plotting in hatched <br />area are borderline <br />classifications <br />requiring use of dual <br />symbols. <br />Plasticity Index Chart <br />OH&MH Soils 1_ <br />\ <br />. <br />OL&MLSoils <br />a V E <br />d <br />- <br />E <br />U <br />I <br />(00 3!) 0 O 000 <br />0 <br />;lual1 A P! Seld <br />O <br />O <br />O <br />O <br />rn <br />o <br />O <br />O <br />co <br />O <br />N <br />0 <br />o <br />co <br />O <br />O <br />O <br />E <br />J <br />cr <br />J <br />