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MAJOR <br />DIVISIONS <br />Soil Classification System <br />Uscs <br />GRAPHIC LETTER <br />SYMBOL SYMBOL <br />TYPICAL <br />DESCRIPTIONd'1121 <br />GRAVEL AND <br />CLEAN GRAVEL <br />o._. 6-U., <br />O;P: o :0- <br />GW <br />Well -graded gravel; gravel/sand mixture(s); little or no fines <br />U. <br />o., ti <br />0..o o.o 9: <br />GP <br />y m <br />GRAVELLY SOIL <br />(Little or no fines) <br />Poorly graded gravel; gravel/sand mixture(s); little or no fines <br />N <br />O m'y <br />GRAVEL WITH FINES <br />GM <br />.� > <br />o <br />(More than 50% of <br />coarse fraction <br />Silty gravel; gravel/sand/silt mixture(s) <br />W E '� <br />Z <br />° CD <br />retained on No. 4 <br />(Appreciable amount of <br />fines) <br />Clayey gravel; gravel/sand/clay mixture(s) <br />GC <br />Q <br />c N <br />sieve) <br />w <br />OCj <br />OC13 <br />CLEAN SAND <br />$W <br />Well -graded sand; gravelly sand; little or no fines <br />w c <br />SAND AND <br />SP <br />L.2 <br />w <br />SANDY SOIL <br />(Little or no fines) <br />Poorly graded sand; gravelly sand; little or no fines <br />Q< T � <br />0 <br />SAND WITH FINES <br />SIVI <br />OU m <br />(More than 50% of <br />coarse fraction passed <br />Silty sand; sand/silt mixture(s) <br />SC <br />through No. 4 sieve) <br />(Appreciable amount of <br />fines) <br />Clayey sand; sand/clay mixture(s) <br />NIL <br />Inorganic silt and very fine sand; rock flour; silty or clayey fine <br />_j 0 <br />SILT AND CLAY <br />sand or clayey silt with slight plasticity <br />o <br />O o <br />m N <br />CL <br />Inorganic clay of low to medium plasticity; gravelly clay; sandy <br />0 E <br />(Liquid limit less than 50) <br />clay; silty clay; lean clay <br />QL <br />z° <br />Lu <br />° Z o CCUUw N <br />Organic silt; organic, silty clay of low plasticity <br />oLo <br />MH <br />Inorganic silt; micaceous or diatomaceous fine sand <br />(D CUW N <br />SILT AND CLAY <br />Z 20 <br />CH <br />Inorganic clay of high plasticity; fat clay <br />o ° <br />(Liquid limit greater than 50) <br />OH <br />Organic clay of medium to high plasticity; organic silt <br />HIGHLY ORGANIC SOIL <br />PT <br />Peat; humus; swamp soil with high organic content <br />GRAPHIC LETTER <br />OTHER MATERIALS SYMBOL SYMBOL TYPICAL DESCRIPTIONS <br />PAVEMENT <br />AC or PC <br />Asphalt concrete pavement or Portland cement pavement <br />ROCK <br />RK <br />Rock (See Rock Classification) <br />WOOD <br />WD <br />Wood, lumber, wood chips <br />DEBRIS <br />O O O <br />Dg <br />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 <br />Procedure), as outlined in ASTM D 2488. Where laboratory index testing has been conducted, soil classifications are based on the Standard Test Method <br />for Classification 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 <br />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 <br />Field and Lab Test Data <br />SAMPLE NUMBER & INTERVAL <br />SAMPLER TYPE <br />Code Description <br />Code <br />Description <br />Sample Identification Number <br />a 3.25-inch O.D., 2.42-inch I.D. Split Spoon <br />PP = 1.0 <br />Pocket Penetrometer, tsf <br />b 2.00-inch O.D., 1.50-inch I.D. Split Spoon <br />TV = 0.5 <br />Torvane, tsf <br />Recovery Depth Interval <br />c Shelby Tube <br />PID = 100 <br />Photoionization Detector VOC screening, ppm <br />4 Sample Depth Interval <br />d Grab Sample <br />W = 10 <br />Moisture Content, % <br />1= J <br />e Other - See text if applicable <br />D = 120 <br />Dry Density, pcf <br />Portion of Sample Retained <br />1 300-lb Hammer, 30-inch Drop <br />-200 = 60 <br />Material smaller than No. 200 sieve, % <br />for Archive or Analysis <br />2 140-lb Hammer, 30-inch Drop <br />GS <br />Grain Size - See separate figure for data <br />3 Pushed <br />AL <br />Atterberg Limits - See separate figure for data <br />4 Other - See text if applicable <br />GT <br />CA <br />Other Geotechnical Testing <br />Chemical Analysis <br />Groundwater <br />Cl Approximate water elevation at time of drilling (ATD) or on date noted. Groundwate <br />ATD levels can fluctuate due to precipitation, seasonal conditions, and other factors. <br />