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Soil Classification System <br /> uscs <br /> MAJOR GRAPHIC LETTER TYPICAL <br /> DIVISIONS SYMBOL SYMBOLt't DESCRIPTIONS tsl(s) <br /> GRAVEL AND CLEAN GRAVEL 3 io i°:.6°::p GW Well-graded gravel;gravel/sand mixture(s);little or no fines <br /> GRAVELLY SOIL u u o <br /> N (Little or no fines) °. . . •m o. q °. GP Poorly graded gravel;gravel/sand mixture(s);little or no fines <br /> a d 1 (More than 50%of GRAVEL WITH FINES ' GM Silty gravel;gravel/sand/silt mixture(s) <br /> Q E coarse fraction retained (Appreciable amount of <br /> 0 on No.4 sieve) fines) °+ ' j GC Clayey gravel;gravel/sand/clay mixture(s) <br /> 0 • <br /> o Z° SAND AND CLEAN SAND SW Well-graded sand;gravelly sand;little or no fines <br /> w m c SANDY SOIL (Little or no fines) <br /> rA.a L SP Poorly graded sand;gravelly sand;little or no fines <br /> Q <br /> m `a (More than 50%of SAND WITH FINES l <br /> OO 5 coarse fraction passed (Appreciable amount of rr SM Silty sand;sand/silt mixture(s) <br /> l : <br /> through No.4 sieve) fines) $C Clayey sand;sand/clay mixture(s) <br /> J a - )1)/ <br /> ML Inorganic silt and very fine sand;rock flour;silty or clayey fine <br /> O"- s m SILT AND CLAY sand or clayey silt withr slight plasticity <br /> rn o•- N CL Inorganic clay of low to medium plasticity;gravelly clay;sandy <br /> m'N clay;silty clay;lean clay <br /> 0...m (Liquid limit less than 50) <br /> Z m y y QL Organic silt;organic,silty clay of low plasticity <br /> Q.- NO <br /> o N SILT AND CLAY MH Inorganic silt;micaceous or diatomaceous fine sand <br /> 0 0 <br /> 0 j Z CH Inorganic clay of high plasticity;fat clay <br /> Z E (Liquid limit greater than 50) <br /> OH Organic clay of medium to high plasticity;organic silt <br /> HIGHLY ORGANIC SOIL PT Peat;humus;swamp soil with high organic content , <br /> GRAPHIC LETTER <br /> OTHER MATERIALS SYMBOL_ SYMBOL TYPICAL DESCRIPTIONS <br /> PAVEMENT �: '. AC or PC Asphalt concrete pavement or Portland cement pavement <br /> i <br /> ROCK �A, RK Rock(See Rock Classification) <br /> WOOD WD Wood,lumber,wood chips <br /> ,h <br /> DEBRIS O/O/O/ DB Construction debris,garbage <br /> Notes: 1. USCS letter symbols correspond to symbols used by the Unified Soil Classification System and ASTM classification methods.Dual letter symbols <br /> (e.g.,SP-SM for sand or gravel)indicate soil with an estimated 5-15%fines.Multiple letter symbols(e.g.,ML/CL)indicate borderline or multiple soil <br /> classifications. <br /> 2. Soil descriptions are based on the general approach presented in the Standard Practice for Description and Identification of Soils(Visual-Manual <br /> Procedure),outlined in ASTM D 2488.Where laboratory index testing has been conducted,soil classifications are based on the Standard Test <br /> Method for Classification of Soils for Engineering Purposes,as outlined in ASTM D 2487. <br /> 3. Soil description terminology is based on visual estimates(in the absence of laboratory test data)of the percentages of each soil type and is defined <br /> as follows: <br /> Primary Constituent: >50%-"GRAVEL,""SAND,""SILT,""CLAY,"etc. <br /> Secondary Constituents: >30%and<50%-"very gravelly,""very sandy,""very silty,"etc. <br /> >15%and<30%-"gravelly,""sandy,""silty,"etc. <br /> Additional Constituents: > 5%and<15%-"with gravel,""with sand,""with sift,"etc. <br /> < 5%-"with trace gravel,""with trace sand,""with trace silt,"etc.,or not noted. <br /> 4. Soil density or consistency descriptions are based on judgement using a combination of sampler penetration blow counts,drilling or excavating <br /> conditions,field tests,and laboratory tests,as appropriate. <br /> Drilling and Sampling Key Field and Lab Test Data <br /> SAMPLER TYPE SAMPLE NUMBER&INTERVAL <br /> Code Description Code Description <br /> a 3.25-inch O.D.,2.42-inch I.D.Split Spoon PP=1.0 Pocket Penetrometer,tsf <br /> b 2.00-inch O.D.,1.50-inch I.D.Split Spoon Sample Identification Number TV=0.5 Torvane,tsf <br /> c Shelby Tube PID=100 Photoionization Detector VOC screening,ppm <br /> d Grab Sample +- Recovery Depth Interval W=10 Moisture Content,% <br /> e Single-Tube Core Barrel D=120 Dry Density,pcf <br /> f Double-Tube Core Barrel 1� J Sample Depth Interval -200=60 Material smaller than No.200 sieve,% <br /> g 2.50-inch O.D.,2.00-inch I.D.WSDOT Portion of Sample Retained GS Grain Size-See separate figure for data <br /> h 3.00-inch O.D.,2.375-inch I.D.Mod.California for Archive or Analysis AL Atterberg Limits-See separate figure for data <br /> i Other-See text if applicable GT Other Geotechnical Testing <br /> 1 300-lb Hammer,30-inch Drop CA Chemical Analysis <br /> 2 140-lb Hammer,30-inch Drop Groundwater <br /> 3 Pushed <br /> 4 Vibrocore(Rotosonic/Geoprobe) Q Approximate water level at time of drilling(ATD) <br /> 5 Other-See text if applicable T. Approximate water level at time other than ATD <br /> 777X Composite Wing Figure <br /> IALANDAU Fabrication Center Soil Classification System and Key A_1 <br /> ASSOCIATES Everett,Washington <br />