07/15/2004 Env Bd Packet - Laserfiche WebLink

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