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�l <br />Andrie Street Improvements <br />Ramsey, Minnesota <br />NTI Project No. 15.61197.100 <br />Classification of Soils for Engineering Purposes <br />ASTM Designation <br />D-2487 and D 2488 (Unified Soil <br />Classification <br />System) <br />Group <br />Major <br />Divisions <br />Symbols <br />Typical Names <br />Classification <br />Criteria <br />Well -graded <br />Cu = D60 / Dto <br />greater than 4. <br />gravels and <br />GW <br />gravel -sand <br />o <br />U) <br />> <br />mixtures, little or <br />CZ = (D3o)Z / (Dto x <br />D60) between 1 & 3. <br />m <br />no fines. <br />Poorly graded <br />gravels and <br />N <br />M <br />GP <br />gravel -sand <br />o <br />Not meeting both criteria for GW materials. <br />o <br />U <br />mixtures, little or <br />° <br />no fines. <br />a <br />U <br />silty gravels, <br />limits <br />Atterberg limits plotting <br />o C <br />U' U)Atterberg <br />GM <br />gravel -sand -silt <br />below "A" line, or <br />in hatched area are <br />° <br />mixtures. <br />2 o- <br />o <br />— <br />P.I. less than 4. <br />borderline <br />y <br />° <br />N <br />c <br />74 o <br />Atterberg limits <br />classifications <br />Clayey gravels, <br />> <br />20 <br />o I <br />m c <br />GC <br />gravel -sand -clay <br />m 0 <br />0 <br />m <br />above "A" line with <br />requiring use of dual <br />in <br />LL <br />mixtures. <br />P. 1. greater than 7. <br />symbols. <br />o <br />y <br />> : <br />Cu =D6o / Dto greater than 6. <br />Well -graded sands <br />0 <br />o <br />and <br />N <br />SW <br />gravelly <br />u <br />z <br />-o <br />sands, little or no <br />CX <br />u) <br />o <br />c <br />° <br />fines. <br />o <br />o <br />o <br />Cz = (D30)2 / Dto x <br />D60between 1 & 3. <br />N <br />y <br />o <br />N <br />z <br />Poorly -graded <br />_ <br />m <br />SP <br />sands and gravelly <br />y <br />o <br />z <br />M <br />Not meeting both criteria <br />for SW materials. <br />° <br />U <br />sands, little or no <br />N <br />a <br />° <br />fines. <br />_ <br />o N <br />N <br />m <br />Atterberg limits <br />Atterberg limits plotting <br />o <br />o <br />coco <br />o N <br />L <br />t <br />SM <br />silt sands, sand- <br />Silty <br />silt mixtures. <br />a o <br />o <br />N <br />— <br />below "A" line, or <br />in hatched area are <br />Lo <br />o <br />P. 1. less than 4. <br />borderline <br />N <br />Atterberg limits <br />classifications <br />Clayey sands, <br />o <br />`o <br />`o <br />SC <br />sand -clay <br />co <br />o <br />o <br />above "A" line with <br />requiring use of dual <br />U <br />� <br />° .c <br />ALL <br />mixtures. <br />P. 1. greater than 7. <br />symbols. <br />Inorganic silts, <br />ML <br />very fine sands, <br />Plasticity Index Chart <br />N <br />rock flour, silty or <br />clayey fine sands. <br />60 - <br />Inorganic clays of <br />oLO <br />low to medium <br />50 <br />plasticity, gravelly <br />CL <br />o <br />clays, sandy clays, <br />a <br />silty clays, lean <br />40 -IMEMEMWIFEE <br />clays. <br />E <br />Organic silts and <br />y <br />30 - <br />T <br />J <br />OL organic silty clays <br />of low plasticity. <br />R <br />a. 20 <br />Inorganic silts, <br />- <br />MENE <br />0011ME <br />micaceous or <br />) <br />N <br />m <br />MH <br />diatomaceous fine <br />A <br />p <br />sands or silts, <br />10 - <br />oN <br />elastic silts. <br />MEN <br />Inorganic clays of <br />R <br />0 -MM <br />0 10 20 30 40 50 60 70 80 90 100 <br />zo <br />CH high plasticity, fat <br />aa) <br />a E <br />clays. <br />N <br />iD <br />Liquid Limit <br />mOrganic <br />4 <br />clays of <br />L <br />ao <br />� <br />OH medium to high <br />p <br />LO <br />plasticity. <br />LO <br />v <br />� •_ <br />Peat, muck and <br />C7 <br />y <br />R <br />Pt <br />other highly <br />Oy <br />organic soils. <br />Page 11 of 15 <br />