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CITY OF SANTA ANA 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) Walt -graded gravels, gravel -sand `'W GRAVELS �`afs mixtures, little or no fines More than 50%ye GP Poorly graded gravels, gravel -sand of coarse mixtures. little or no fines � �- fraction larger --------- ----- Gravels with tines (AAore than 12% fines) than No. 4 sieve size GM ) Sty gravels, gravel -sand -silt mixtures GC ` Clayey gravels, gravel -sand -clay mixtures Clean Sands(Less than 5% fines SW Well -graded sands, gravelly sands, ' Nttle or no fines SANDS--- 50% or more i Pommy grew sands, gravelly sands, of coarse I little or no tines fraction smaller ems„ with fines than 12% fines than No. 4 -� --- --- sieve size '�' $M Silly 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 sills and very fine sands, rock SILTS ML flour, silty of clayey fine sands or clayey AND oft with slight plasticity Inorganic days of low to medium CLAYS Liquid limit CL plasticity, grey days, sandy clays, less than silty days, lean days 50% -- OL Organic sifts and organic silty days of low plasticity iI Inorganic silts, micaceous or MH diatomaceous fine sandy or silty soils, SILTS ! eiastic silts AND--- -- ---------- ...� CLAYS Inorganic ch" of high pludcIty, fat CH Liquid limit days 50% or greater M. OH Organic days of medium to high > plastic b, organic silts HIGHLY ORGANIC ; PT Peat and other highly organic soils SOILS LABORATORY Approved IR PERMIT ISSUANC TION CRITERIA Master ID: _ D Date: p T---- GW Cu = D ii0 greater than 4 Cc = 30 between 1 and 3 10 GP Not meeting all gradation requirements for GW GM Aderberg limits below "A" line or P.1. 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 SW Cs D- greater than 4: Cc = D DXoD between 1 and 3 10 10 60 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" bord"ne 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 smaler than No. 200 sieve size), ooarse-graved soils are classified as follows: Less then 5 percent .................................. . . GW. GP, SW, SP More than 12 percent ................ .... . . . ....... . GM, GC, SM, SC 5 to 12 percent . .. . ... . . . ......... Border** cases requidr►g dual symbols 1112 W 6th St Santa Ana Ca 92703 Soil Classification `A' PRIORITY ENGINEERING GROUP