7814 LARIMER RD B 2022-02-18 - Laserfiche WebLink

13f AMERICAN V GEOSERVICES DESCRIPTIVE TERMINOLOGY & SOIL CLASSIFICATION UNIFIED SOIL CLASSIFICATION SYSTEM UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART COARSE -GRAINED SOILS (more than 50% of material is larger than No. 200 sieve size.) Clean_ Gravels (Less than 5% fines) _ R Well -graded gravels gravel -sand GW GRAVELS mixtures, little or no fines _ More than 50% oo GP Poorly -graded gravels, gravel -sand of coarse o mixtures, little or no fines fraction larger Gravels with fines (More than 12% fines) than No. 4 «a -- --- — sieve size ° GM Silty gravels, gravel -sand -silt mixtures y GC Clayey gravels, gravel -sand -clay mixtures Clean Sands (Less than 5% fines) _ SW Well -graded sands, gravelly sands, little or no fines SANDS - -- 50% or more SP Poorly graded sands, gravelly sands, of coarse little or no fines fraction smaller Sands with fines (More than 12% fines) than No 4 t, - sieve size s : SM Silty sands, sand -silt mixtures SC Clayey sands, sand -clay mixtures FINE-GRAINED SOILS (50% or more of material is smaller than No. 200 sieve size.) Inorganic silts and very fine sands, rock MIL flour, silty of clayey fine sands or clayey SILTS silts with slight plasticity 9 P y AND CLAYS Inorganic clays of low to medium Liquid limit CL plasticity, gravelly clays, sandy clays, less than silty clays, lean clays 50% - OL Organic silts and organic silty clays of low plasticity Inorganic silts, micaceous or MH diatomaceous fine sandy or silty soils, SILTS elastic silts AND CLAYS CH Inorganic clays of high plasticity, fat Liquid limit clays 50% or greater i Organic clays of medium to high OH plasticity, organic silts J HIGHLY -- ORGANIC _ PT Peat and other highly organic soils SOILS LABORATORY CLASSIFICATION CRITERIA Cu = D60 reater than 4; C D30 between 1 and 3 9 c= GW D10 D10xD6o GP Not meeting all gradation requirements for GW GM Atterberg limits below "A' line or P.I. less than 4 Above "A" line with P.I. between 4 and 7 are borderline cases GC Atterberg limits above "A" requiring use of dual symbols line with P.I. greater than 7 C = D60 greater than 4; C = D30 between 1 and 3 SW u D 1 o c D10 x D60 Sp Not meeting all gradation requirements for GW SM Atterberg limits below "A" Limits plotting in shaded zone line or P.I. less than 4 with P.I. between 4 and 7 are Atterberg limits above "A" borderline cases requiring use SC line with P.I. greater than 7 of dual symbols. Determine percentages of sand and gravel from grain -size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size), coarse -grained soils are classified as follows: Less than 5 percent .................................... GW, GP, SW, SP More than 12 percent .................................. GM, GC, SM, SC 5 to 12 percent ................... Borderline cases requiring dual symbols 60 50 a W 40 a ? 30 ca 20 g 10 a. PLASTICITY CHART I CH t ALINE: PI = 0.73(LL-20) CL MH&OH ML&OL 0 0 10 20 30 40 50 60 70 80 90 100 LIQUID LIMIT (LL) (%)