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Riverdale Drive Improvements <br />Ramsey, Minnesota <br />NTI Project No. 15.61197.100 <br />Classification of Soils <br />ASTM Designation D-2487 <br />Major Divisions <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 />a <br />ti <br />Silts and Clays <br />Silts and Clays <br />Liquid Limit of 50% or less <br />Clean Gravels <br />Clean Sands <br />for Engineering Purposes <br />and D 2488 (Unified Soil Classification System) <br />Group Typical Names Classification Criteria <br />Symbols yP <br />C =D6o/Dto <br />GW <br />GP <br />GM <br />GC <br />SW <br />SP <br />SM <br />SC <br />ML <br />CL <br />OL <br />MH <br />CH <br />OH <br />Pt <br />Well —graded <br />gravels and <br />gravel -sand <br />mixtures, little or <br />no fines. <br />Poorly graded <br />gravels and <br />gravel -sand <br />mixtures, little or <br />no fines. <br />Silty gravels, <br />gravel -sand -silt <br />mixtures. <br />Clayey gravels, <br />gravel -sand -clay <br />mixtures. <br />Well -graded <br />sands and <br />gravelly sands, <br />little or no fines. <br />Poorly -graded <br />sands and <br />gravelly sands, <br />little or no fines. <br />Silty sands, sand - <br />silt mixtures. <br />Clayey sands, <br />sand -clay <br />mixtures. <br />Inorganic silts, <br />very fine sands, <br />rock flour, silty or <br />clayey fine sands. <br />Inorganic clays of <br />low to medium <br />plasticity, gravelly <br />clays, sandy <br />clays, silty clays, <br />lean clays. <br />Organic silts and <br />organic silty clays <br />of low plasticity. <br />Inorganic silts, <br />micaceous or <br />diatomaceous fine <br />sands or silts, <br />elastic silts. <br />Inorganic clays of <br />high plasticity, fat <br />clays. <br />Organic clays of <br />medium to high <br />plasticity. <br />Peat, muck and <br />other highly <br />organic soils. <br />Classification on basis of percentage of fines. <br />Plasticity Limit <br />GW, GP, SW, SP <br />Less than 5% passing No. 200 Sieve: <br />60 <br />GM, GC, SM, SC <br />More than 12% passing No. 200 Sieve: <br />greater than 4. <br />CZ = (D3o)2 / (Dto x D60) between 1 & 3. <br />o Not meeting both criteria for GW materials. <br />:w <br />Atterberg limits <br />below "A" line, or <br />P.I. less than 4. <br />Atterberg limits <br />above "A" line with <br />P.I. greater than 7. <br />Atterberg limits plotting <br />in hatched area are <br />borderline <br />classifications <br />requiring use of dual <br />symbols. <br />C = D60 / Dip greater than 6. <br />CZ = (D30)2 / (Dto x D6o) between 1 & 3. <br />Not meeting both criteria for SW materials. <br />Atterberg limits <br />below "A" line, or <br />P.I. less than 4. <br />Atterberg limits <br />above "A" line with <br />P.I. greater than 7. <br />Plasticity Index Chart <br />CnarcforelassneatI000f finegrametlsolls <br />50-andtnefInf,aetIonofeoarse9ramedsolls <br />Atter. gLmltsplottmgmhatehetlareaare <br />40 tlomrtletlmeelassfeatlonstepolnngoseof dual <br />mtlal� <br />30 <br />20 <br />10 <br />0 <br />CL Soils <br />CL-• LSoes <br />/ r OLBMLkols <br />0 10 20 30 40 50 60 <br />Liquid Limit <br />Atterberg limits plotting <br />in hatched area are <br />borderline <br />classifications <br />requiring use of dual <br />symbols. <br />CHSoils <br />"A" Une <br />I OH&MHSoils <br />70 80 <br />90 100 <br />Page 10 of 14 <br />