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STS General Boring Log Notes <br /> <br />DRILLING & SAMPLING SYMBOLS: <br /> <br />SS: <br /> <br />ST: <br /> <br />AS: <br />WS: <br />OS: <br />BS: <br />CS: <br /> <br />Split Spoon- I 3/8" I.D., 2" O.D. <br />Unless otherwise noted <br />Shelby Tube-2" O.D., <br />Unless otherwise noted <br />Auger Sample <br />Wash Sample <br />Osterberg Sampler - 3" Shelby Tube <br />Bulk Sample from Exposed Material <br />Continuous Sample Tube <br /> <br />PA: <br />HS: <br />RB: <br />FT: <br />DB: <br />VS: <br />PM: <br />HA: <br /> <br />Power Auger- 4 1/4" unless otherwise noted <br />Hollow Stem Auger <br />Tri-Cone Rotary Bit <br />Fish Tail Bit <br />Diamond Coring Bit <br />Vane Shear <br />Pressuremeter Test, In-Situ <br />Hand Auger <br /> <br />Standard Penetration Test N-value: Total blows for last foot of penetration of a 2 inch O.D. split spoon sampler <br /> driven by a 140 pound hammer falling 30 inches, except where otherwise noted. <br /> <br />WATER LEVEL MEASUREMENT SYMBOLS: <br /> <br />WL: Water Level WCl: Wet Cave In <br />WS: While Sampling DCl: Dry Cave In <br />WD: While Drilling BCR: Before Casing Removal <br />AB: After Boring ACR: After Casing Removal <br /> <br />Water levels indicated on the boring logs are the levels measured in the boreholes at the time indicated. In <br />relatively pervious soils (e.g. sands and gravels), the indicated groundwater levels are considered reliable. In <br />relatively impervious soils (e.g. silts and clays), the indicated groundwater levels may not be reliable. For <br />boreholes or wells in Iow permeability soils, relatively long periods of time are usually required for the <br />groundwater to obtain an equilibrium position. Generally, a more accurate determination of water levels can be <br />made from monitoring wells or piezometers sensing aquifers of interest with readings over a period of weeks to <br />months. <br /> <br />GRADATION DESCRIPTION & TERMINOLOGY: <br /> <br />Coarse grained or granular soils have more than 50% of their dry weight retained on a #200 sieve; they are <br />generally described as: boulders, cobbles, gravel or sand. Fine grained soils have less than 50% of their dry <br />weights retained on a No. 200 sieve; they are generally described as: clays, silty clays, or clayey silts if they are <br />cohesive and silts if they are non-cohesive. Granular soils are also described on the basis of their relative in- <br />place density and fine grained soils are described on the basis of their strength, consistency and plasticity. <br /> <br />Major Description Of <br />Component Components Also Percent of Dry <br />of Sample Size Ran.qe Present in Sample Wei.qht <br />Boulders Over 12 in. (200 mm) Trace 1-9 <br />Cobbles 12 inches to 3 inches Little 10-19 <br /> (200 mm to 75 mm) <br />Gravel 3 inches to #4 sieve Some 20-34 <br /> (75 mm to 4.76 mm) <br />Sand #4 to #200 sieve And 35-50 <br /> (4.76 mm to 0.074 mm) <br />Silt Passing #200 sieve <br /> (0.074 mm to 0.002 mm) <br />Clay Passing #200 sieve <br /> Smaller than 0.002 mm <br /> <br />CONSISTENCY OF COHESIVE SOILS <br /> <br />RELATIVE DENSITY OF GRANULAR SOILS: <br /> <br />Unconfined <br />Compressive SPT N-Value Relative <br />Strength, Qu (tsf) Consistency (blows/ft) Density <br />0.25 Very Soft 0-3 Very Loose <br />0.25-0.49 Soft 4-9 Loose <br />0.50-0.99 Medium (Firm) 10-29 Medium Dense <br />1.00-1.99 Stiff 30-49 Dense <br />2.00-3.99 Very Stiff 50-80 Very Dense <br />4.00-8.00 Hard >80 Extremely <br />>8.00 Very Hard Dense <br /> <br /> <br />