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1 <br /> <br />1 <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />lJ <br /> <br /> <br /> <br />IJ <br />1 <br /> <br />1 <br />DRILLING AND EXPLORATION <br />DRILLING & SAMPLING SYMBOLS <br />RS :Ring Sampler - 2.42" I.D. <br />SS : Split Spcon - 1_" I.D., 2" O.D., unless otherwise noted PS :Piston Sample <br />ST : Thin-Walled Tube - 2-1/2" I.D., unless otherwise noted WS :Wash Sample <br />PA : Power Auger FT :Fish Tail Bit <br />HA : Hand Auger RB :Rock Bit <br />DB : Diamond Bit = 4", N, B BS :Bulk Sample <br />AS : Auger Sample PM :Pressure Meter <br />HS : Hollow Stem Auger DC :Dutch Cone <br /> W B :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 noted. <br />WATER LEVEL MEASUREMENT SYMBOLS <br />WL : Water Level WS : While Sampling <br />WCI :Wet Cave in WD : While Drilling <br />DCI : Ory Cave in BCR :Before Casing Removal <br />AB : After Boring 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, the <br />indicated levels may reFlect the location of groundwater. In low permeability soils, the accurate determination of groundwater <br />levels is not possible with only short term observations. <br />DESCRIPTIVE SOIL CLASSIFICATION: <br />Sail Classification is based on the Unified Soil Classification system and the ASTM Designations D-2487 and D-2488. Coarse <br />Grained Soils have more than 50% of their dry weight retained on a #200 sieve; they are described as: boulders, cobbles, <br />gravel or sand. Fine Grained Soils have less than 50% of their dry weight retained on a #200 sieve; they are described as: <br />clays, if they are plastic, and silts if they are slightly plastic or non-plastic. Major constituents may be added as modifiers and <br />minor constituents may be added according to the relative proportions based on grain size. In addition to gradation, coarse <br />grained soils are defined on the basis of their relative in-place density and fine grained soils on the basis of their consistency. <br />Example: Lean clay with sand, trace gravel, stiff (CL); silly sand, trace gravel, medium dense (SM). <br />CONSISTENCY OF FINE-GRAINED SOILS: RELATIVE DENSITY OF <br />Unconfined Compressive COARSE-GRAINED SOILS: <br />Strength, Qu, psf Consistency N-Blows/ft. Relative Density <br />< 500 Very Soft 0-3 Very Loose <br />500 - 1,000 Soft 4-9 Loose <br />1,001 - 2,000 Medium 10-29 Medium Dense <br />2,001 - 4,000 Stiff 30.49 Dense <br />4,001 - 8,000 Very Stiff 50-80 Very Dense <br />8,001 -16,000 Very Hard 80+ ExVemely Dense <br />RELATIVE PROPORTIONS OF <br />SAND AND GRAVEL GRAIN SIZE TERMINOLOGY <br />Descriptive Term(s) Major Component <br />(of Components Also Percent of of Sample Size Range <br />Present in Sample) Dry Weight Boulders Over 12 in. (300mm) <br />Trace < 15 Cobbles 12 in. to 3 in. <br />W ilh 15 - 29 (300mm to 75mm) <br />Modifier > 30 Gravel 3 in. to #4 sieve <br /> (75mm to 4.75mm) <br />RELATIVE PROPORTIONS OF FINES Sand #4 to #200 sieve <br />Descriptive Term(s) (4.75mmto .075mm) <br />(of Components Also Percent of Silt or Clay Passing #200 Sieve <br />Present in Sample) Dry Weight (0.075mm) <br />Trace < 5 <br />With 5 -12 <br />Modifier > 12 <br />l~~rra~on <br />1 <br />