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Soil Classification System
<br /> uscs
<br /> MAJOR GRAPHIC LETTER TYPICAL
<br /> DIVISIONS SYMBOL SYMBOL DESCRIPTIONSt1tt2t
<br /> "o"o .
<br /> GRAVEL AND CLEAN GRAVEL °o 0 0 0 GW Well-graded gravel;graveVsand mixture(s);little or no fines
<br /> ....10,(r, GRAVELLY SOIL (Little or no fines) D 0 o.0 0 0
<br /> N io
<br /> 0,0 ; Gp Poorly graded gravel;graveVsand mixture(s);little or no fines
<br /> O o y
<br /> v) u o (More than 50%of
<br /> 0 " > GRAVEL WITH FINES '.E.' GM Silty gravel;graveVsand/silt mixture(s)
<br /> C a) coarse fraction retained ) '
<br /> ZE o on No.4 sieve) (Appreciable amount of a
<br /> 0 o fines) . • .,y GC Clayey gravel;graveVsand/clay mixture(s)
<br /> 0 U o
<br /> aj c cSAND AND CLEAN SAND SW Well-graded sand;gravelly sand;little or no fines
<br /> r 2 SANDY SOIL (Little or no fines)
<br /> Q ,a� SP Poorly graded sand;gravelly sand;little or no fines
<br /> o
<br /> OU (More than 50%of SM Silty sand;sand/sift mixture(s)
<br /> coarse fraction passed SAND WITH FINES ) I
<br /> through No.4 sieve) (Appreciable amount of
<br /> fines) SC Clayey sand;sand/clay mixture(s)
<br /> Inorganic silt and very fine sand;rock flour;silty or clayey fine
<br /> TO, uo', SILT AND CLAY ML sand or dayey silt with slight plasticity
<br /> O .N Inorganic clay of low to medium plasticity;gravelly clay;sandy
<br /> 0E N (Liquid limit less than 50) CL clay;silty clay;lean clay
<br /> LU0
<br /> Z o
<br /> Z o Z OL Organic silt;organic,silty clay of low plasticity
<br /> O C N
<br /> � m�
<br /> n
<br /> rSILT AND CLAY MH Inorganic silt;micaceous or diatomaceous fine sand
<br /> LL W( Liquid limit greater than 50) CH Inorganic clay of high plasticity;fat clay
<br /> N �ti�r���J l 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 /> ROCK ,,/, RK Rock(See Rock Classification)
<br /> WOOD .�~ WD Wood,lumber,wood chips
<br /> DEBRIS ,0^0 DB Construction debris,garbage
<br /> Notes: 1. Soil descriptions are based on the general approach presented in the Standard Practice for Description and Identification of Soils(Visual-Manual Procedure),
<br /> as outlined in ASTM D 2488.Where laboratory index testing has been conducted,soil classifications are based on the Standard Test Method for Classification
<br /> of Soils for Engineering Purposes,as outlined in ASTM D 2487.
<br /> 2. 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 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 /> >12%and<30%-"gravelly,""sandy,""silty,"etc.
<br /> Additional Constituents: > 5%and<12%-"slightly gravelly,""slightly sandy,""slightly silty,"etc.
<br /> < 5%-'trace gravel,""trace sand,""trace silt,"etc.,or not noted.
<br /> Drilling and Sampling Key Field and Lab Test Data
<br /> SAMPLE NUMBER&INTERVAL SAMPLER TYPE
<br /> Code Description Code Description
<br /> Sample Identification Number a 3.25-inch O.D.,2.42-inch I.D.Split Spoon PP=1.0 Pocket Penetrometer,tsf
<br /> 11,
<br /> b 2.00-inch O.D.,1.50-inch I.D.Split Spoon TV=0.5 Torvane,tsf
<br /> Recovery Depth Interval c Shelby Tube PID=100 Photoionization Detector VOC screening,ppm
<br /> 1A l~ Sample Depth Interval d Grab Sample W=10 Moisture Content,%
<br /> e Other-See text if applicable D=120 Dry Density,pcf
<br /> Portion of Sample Retained 1 300-lb Hammer,30-inch Drop -200=60 Material smaller than No.200 sieve,%
<br /> for Archive or Analysis 2 140-lb Hammer,30-inch Drop GS Grain Size-See separate figure for data
<br /> 3 Pushed AL Atterberg Limits-See separate figure for data
<br /> 4 Other-See text if applicable GT Other Geotechnical Testing
<br /> Groundwater CA Chemical Analysis
<br /> Q Approximate water elevation at time of drilling(ATD)or on date noted. Groundwater
<br /> ATD levels can fluctuate due to precipitation,seasonal conditions,and other factors.
<br /> Horizon Elementary Portable Figure
<br /> C�G'QTG 5T 222 W. Casino Road Soil Classification System and Key 5
<br /> Everett, Washington
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