Laserfiche WebLink
<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />t <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br />GENERAL NOTES <br />DRILLING AND EXPLORATION <br />DRILLING & SAMPLING SYMBOLS <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 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 />WB : Wastt 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 :Dry 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 />Soil 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); silty sand, trace gravel, medium dense (SM). <br /> RELATIVE DENSITY OF <br /> <br />CONSISTENCY OF FINE-GRAINED SOILS: COARSE-GRAINED SOILS: <br /> <br />Unconfined Compressive N-Blows/ft Relative Density <br />Strength, Du, psf Consistency <br />< 500 Very Soft <br />500 - 1,000 Soft 0-3 Very Laose <br />1,001 -2,000 Medium 49 Loose <br />2,001 - 4,000 Stiff 10-29 Medium Dense <br />4,001 - 8,000 Very Stiff 309 Dense <br />8,001 -16,000 Very Hard 50.80 Very Dense <br /> 80+ Extremely Dense <br />RELATIVE PROPORTIONS OF <br />SAND AND GRAVEL <br />Descriptive Term(s) <br />(of Components Also <br />Present in Sample) <br />Trace <br />With <br />Modifier <br />RELATIVE PRf <br />Descriptive Tertn(s) <br />(of Components Also <br />Present in Sample) <br />Trace <br />With <br />Modifier <br />Percent of <br />Dry Weight <br />< 15 <br />15-29 <br />> 30 <br />)PORTIONS OF FINES <br />Percent of <br />Dry Weight <br />< 5 <br />5-12 <br />> 12 <br />GRAIN SIZE TERMINOLOGY <br />Major <br />Component <br />of Sample Size Range <br />Boulders Over 12 in. (300mm) <br />Cobbles 12 in. to 3 in. (300mm to 75mm) <br />Gravel 3 in. to #4 sieve (75mm to 4.75mm) <br />Sand f14 to #200 sieve(4.75mm to 0.075mm) <br />Silt or Clay Passing #200 Sieve (0.075mm) <br />P~R11G ON <br />