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DRILLING AND EXPLORA <br />DRIWNG & SAMPLING SYMBOLS: <br />R :Ring Barrel) - 2.42' I.D., 3' O.D., unless otherwise noted <br />SS :Split Spoon - 1 ~/." I.D., 2' O.D., unless otherwise noted PS :Piston Sample <br />ST :Thin-Walled Tube • 2' O.D., unless otherwise noted WS :Wash Sample <br />PA :Power Auger FT :Fish Tail Blt <br />HA :Hand Auger RB :Rock Bit <br />OB :Diamond Bit ~ 4', N, B BS :Bulk Sample <br />AS :Auger Sample PM :Pressure Meter <br />HS :Hollow Stem Auger DC : Dutch Cone <br /> WB :Wash Bore <br />Penetration Test: Blows per foot of a 140 pound hammer falling 30 inches on a 2-inch O.D. split spoon, except where <br />noted. <br />WATER LEVEL MEASUREMENT SYMBOLS: <br />WL :Water Level WS :While Sampling <br />WC1 : Wet Cave in WD ;While Drilling <br />DCI :Dry Cave in BCA :Before Casing Removal <br />AB :After Roring ACR :After Casting Removal <br />Water levels indicated on the boring logs are the levels measured in the borings at the time indicated. In pervious soils, <br />the indicated levels may reflect the location of groundwater.. In low permeability soils, the accurate determinatfan of <br />groundwater levels is not possible with only short term observations. <br />DESCRIPTIVE SOIL CLASSiFiCATION: <br />Soii Classification is based on the Unified Soil Classification system and the ASTM Designations D-2487 and D-2488. <br />Coarse Grained Seils have mare than 50% of their dry weight retained on a #200 sieve; they are described as: boulders, <br />cobbles, gravel or sand. Fine Grained Soils have less than 50% of their dry weight retained an a #200 sieve; they era <br />described as: clays, if they are plastic, and silts if they are slightly plastic or non-plastic. Major constituents may be <br />added as modifiers and minor constituents may be added according to the relative proportions based on grain size. In <br />addition to gradation, coarse grained soils are defined on the basis of their relative in-place density and fine grained sails <br />on the basis of their consistency. Example: Lean clay with sand, trace gravel, stiff (CU; silty sand, trace gravel, medium <br />dense ISMI. <br />CONSISTENCY OF FINE-GRAINED SOILS: <br />Unconfined Compressive <br />Strength, Qu, psf Consistency <br />< 500 Very Soft <br />500 • 1,000 Soft <br />1,001 • 2,000 Medium <br />2,001 - 4,000 Stiff <br />4,001 - 8,000 Very Siff <br />8,001 •16,000 Very Hard <br />RELATIVE PROPORTIONS OF <br />SAND AND GRAVEL <br />Desuip[ive Termisl <br />(af Components Also Percent of <br />Present in Sample) Dry Weight <br />Trace < 15 <br />With 15 - 29 <br />Modifier > 30 <br />RELATIVE PROF <br />Descriptive Tennis) <br />lof Components Alsa <br />Present in Sample) <br />Trace <br />With <br />Modifier <br />'ORTIONS OF F1NE5 <br />Percent of <br />Dry Weight <br />< 5 <br />5-12 <br />> 12 <br />RELATIVE DENSITY OF <br />COARSE-GRAINED SOILS: <br />N-Blows/ft. Relative Density <br />0-3 Very Loose <br />4-9 Loose <br />10-29 Medium Dense <br />30-49 Dense <br />50-80 Very Dense <br />80+ Extremely Dense <br />GRAIN SIZE TERMINOLOGY <br />Major Component <br />of Sample Size Range <br />Boulders Over 12 in. 1300mm1 <br />Cobbles 12 in. to 3 in. <br /> (300mm to 75mm1 <br />Gravel 3 in. to #4 sieve <br />175mm to 4.75mm1 <br />Sand #4 to #200 sieve <br />(4.75mm tc 0.075mm1 <br />Silt or Clay Passing #200 Sieve <br />10.075mm1 <br />rr <br />