2002-04-12_PERMIT FILE - M2002052 (26)

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GENERAL NOTES DRILLING & SAMPLING SYMBOLS SS: Split Spoon - 1-'/S" I.D., 2" O.D., unless otherwise noted HS: Hollow Stem Auger ST: Thin-Walled Tube - 2" O.D., unless otherwise noted PA: Power Auger RS: Ring Sampler - 2.42" I.D., 3" O.D., unless otherwise noted HA: Hand Auger DB: Diamond Bit Coring - 4", N, 8 RB: Rock Bit BS: Bulk Sample or Auger Sample W B: Wash Boring or Mud Rotary The number of blows required to advance a standard 2-inch O.D. split-spoon sampler (SS) the last 12 inches of the total 18-inch penetration with a 140-pound hammer falling 30 inches is considered the "Standard Penetration" or "N-value". WATER LEVEL MEASUREMENT SYMBOLS: WL: Water Level WS: While Sampling WCI: Wet Cave in WD: While Drilling DCI: Dry Cave in BCR: Before Casing Removal AB: After Bodng ACR: After Casing Removal Water levels indicated on the boring logs are the levels measured in the borings at the times indicated. Groundwater levels at other times and other locations across the site could vary. In pervious soils, the indicated levels may reflect the location of groundwater, In low permeability soils, the accurate determination of groundwater levels may not be possible with only short-term observations. DESCRIPTIVE SOIL CLASSIFICATION: Soil classification is based on the Unified Classification System. Coarse Grained Soils have more than 50% of their dry weight retained on a #200 sieve; their principal descriptors are: boulders, cobbles, grave( or sand. Fine Grained Soils have less than 50% of their dry weight retained on a #200 sieve; they are principally described as clays if they are plastic, and silts if they are slightly plastic ornon-plastic. Major constituents may be added as modfiers and minor constituents may be added according to the relative proportions based on grain size. In addition to gradation, coarse-grained soils are defined on the basis of their in-place relative density and fine-grained soils on the basis of their consistency. CONSISTENCY OF FINE-GRAINED SOILS RELATIVE DENSITY OFCOARSE-GRAINED SOILS Standard Unconfined Penetration or Standard Penetration Compressive N-value ISS) or N-value ISS) Strength. Qu. psf BlowslFt. Consistency BlowslFt. Relative Density < 500 <2 Very Soft 0 - 3 Very Loose 500 - 1,000 2-3 Soft 4 - 9 Loose 1,001 - 2,000 4-6 Medium Stiff 10 - 29 Medium Dense 2,001 - 4,000 7-12 Stiff 30 - 49 Dense 4,001 - 8,000 13-26 Very Stiff 50+ Very Dense 8,000+ 26+ Hard RELATIVE PROPORTIONS OF SAND AND GRAVEL GRAIN SIZE TERMINOLOGY Descriptive Term(s) of other Percent of Major Component constituents Drv Weight of Sample Particle Size Trace < 15 Boulders Over 12 in. (300mm) With 15 - 29 Cobbles 12 in. to 3 in. (300mm to 75 mm) Modifier > 30 Gravel 3 in. to #4 sieve {75mm to 4.75 mm) Sand #4 to #200 sieve (4.75mm to 0.075mm) RELATIVE PROPORTIONS OF FINES Silt or Clay Passing #200 Sieve (0.075mm) Descriptive Term(s) of other Percent of PLASTICITY DESCRIPTION constituents Drv Weight Term Ptasticitytndex Trace < 5 Non-plastic 0 With 5-12 Low 1-10 Modifiers > 12 Medium 11-30 High 30+ l~~rracon _ Form 108-9-00