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I i <br />1 <br />f <br />Soil Classification System <br />uscs <br />MAJOR GRAPHIC LETTER <br />DIVISIONS SYMBOL SYMBOL" <br />TYPICAL <br />DESCRIPTIONS1211'l <br />GRAVEL AND, <br />CLEAN GRAVEL <br />G►�( <br />Well -graded gravel; gravellsand mixture(s); little or no fines <br />o :° o •p'o <br />GP <br />g <br />GRAVELLY SOIL <br />(Little or no fines) <br />Poorly <br />y graded gravel; gravellsand mixture(s); little or no fines <br />N <br />o m �, <br />o...o. - <br />GRAVEL WITH FINES <br />GM <br />60 <br />6 <br />(More than 50% of coars <br />fraction retained on No. 4 <br />Silty g g e( ) <br />Si raves raveVSand/sik mixture(s) <br />W E c <br />o <br />sieve) <br />(Appreciable amount of <br />fines) <br />Clayey gravel; gravellsand/clay mixture(s) <br />GC <br />N <br />c <br />SAND AND <br />CLEAN SAND <br />SW <br />Well -graded sand; gravely sand; little or no fines <br />SP <br />ra <br />U) <br />SANDY SOIL <br />(Lille or no fines) <br />Poody graded sand; gravelly sand; little or no fines <br />Q o <br />V(More <br />than 50% of coarse <br />fraction passed through <br />Silty sand; sand/silt mixture(s) <br />SAND WITH FINES <br />SM <br />$G <br />No. 4 sieve) <br />(Appreciable amount of <br />fines) <br />Clayey sand; sand/day mixture(s) <br />ML <br />Inorganic sift and very fine sand; rock flour, silty or clayey fine <br />--r 's m <br />SILT AND CLAY <br />sand or clayey slit with slight plasticity <br />GL <br />Inorganic day of low to medium plasticity; gravely day; sandy <br />a E g <br />(Liquid limit less than 60) <br />clay; silty day; lean day <br />OL <br />o <br />Z rI z _ <br />Organic sift organic, silty day of km plasticity <br />p .. <br />MH <br />Inorganic sift: micaceous or diatomaceous fine sand <br />o � <br />SILT AND CLAY <br />CH <br />Z m a <br />Inorganic day of high plasticity; fat day <br />a' <br />(Liquid limit greater than 50) <br />OH <br />• V! <br />Organic day of medium to high plasticity; organic silt <br />HIGHLY ORGANIC SOIL <br />PT <br />Peat; humus; swamp sole with high organic content <br />GRAPHIC LETTER <br />OTHER MATERIALS SYMBOL SYMBOL TYPICAL DESCRIPTIONS <br />PAVEMENT <br />MAC <br />or PC <br />Asphalt concrete pavement or Portland cement pavement <br />Rock (See Rode Classification) <br />ROCK <br />MW <br />RK <br />WOOD <br />1ND <br />Wood, lumber, wood chips <br />DEBRIS <br />O O <br />DB <br />Construction debris, garbage <br />Notes: 1. USCS letter symbols correspond to the symbols used by the Unified Soil Classification System and ASTM classification methods. Dual letter symbols <br />(e.g., SP•SM) for a sand or gravel indicate a sail with an estimated 5-15% fines. Multiple letter symbols (e.g., MUCL) indicate borderline or multiple soil <br />classifications. <br />2. Solt descriptions are based on the general approach presented in the Standard Pmchce for Description and Identification ofWs (Visual -Manual <br />Procedure). as outlined in ASTM D 2485. Where laboratory index tasting has been conducted, soil classifications are based on the Standard Test <br />Method for Classh7catlon of SDUs for EWhieering Purposes, as outlined in ASTM D 2487. <br />3. Soli description terminology is based on visual estimates On the absence of laboratory test data) of the percentages of each soil type and is defined as <br />follows: Primary Constituent: >50%- "GRAVEL," -SAND,- -SILT," "CLAY.- etc. <br />Secondary Constituents >30% and:SSM - "very gravely," "verysandy," "verysilty; eta <br />> 15% and <30% - -gravely,- -sandy" "silty," etc. <br />Additional Constituents: > 5% and <15% - "with gravel," "with sand," "with silt" eta <br />< 5% - "trace g ravel," "trace sand; "trace silt" etc., or not noted. <br />Drilling and Sampling Key <br />Field and Lab Test Data <br />SAMPLE NUMBER & INTERVAL SAMPLER TYPE <br />Code Description <br />Code <br />Description <br />Sample Identification Number 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., 1.504nch I.D. Split Spoon <br />TV = 0.6 <br />Torvane, tsf <br />i— Recovery Depth Interval c Shelby Tube <br />PID = 100 <br />Photoionization Detector VOC screening, ppm <br />X' I Sample Depth Interval d Grab Sample <br />W = 10 <br />Moisture Content, % <br />e Other - See text If applicable <br />D = 120 <br />Wet Soil Density, per <br />Portion of Sample Retained 1 3004b Hammer, 30-inch Drop <br />-200 = 60 <br />Material smaller than No. 200 sieve, % <br />for Archive or Analysis 2 1404b Hammer, 304nch 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 l applicable <br />GT <br />CA <br />Other Geotechnical Testing <br />Chemical Analysis <br />Groundwater <br />SZ Approximate Water Elevation At Time of Drying (ATD) or On Date Noted. <br />ATD Groundwater levels can fluctuate due to precipitation, seasonal conditions, and <br />other factors. <br />f� <br />Soil Classification System and Key <br />Figure A-1 <br />