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GENERAL NOTES <br /> SAMPLE IDENTIFICATION <br /> Visual soil classifications are made in general accordance with the Unified Soil Classification <br /> System on the basis of textural and particle size categorization, and various soil behavior <br /> characteristics. Visual classifications should be substantiated by appropriate laboratory testing <br /> when a more exact soil identification is required to satisfy specific project applications criteria. <br /> PARTICLE SIZE ± <br /> Boulders: 8 inches Coarse Sand: 2 to 4mm Silt: 0.005 to 0.074mm <br /> Cobbles: 3 to 8 inches Medium Sand: 0.42 to 2mm Clay: -0.005mm <br /> Gravel: 5mm to 3 inches Fine Sand: 0.074 to 0.42mm <br /> DRILLING & SAMPLING SYMBOLS <br /> SS: Split-spoon, 2"O.D. by 1 3/8" I.D. <br /> ST: Shelby Tube, 2" O.D. or 3" O.D., as noted in text RB: Roller Bit <br /> AU: Auger Sample WS: Wash Sample <br /> DB: Diamond Bit BS: Bag Sample <br /> CB: Carbide Bit HA: Hand Auger <br /> SOIL PROPERTY SYMBOLS <br /> N: Standard penetration count, indicating number of blows of a 140 lb. Hammer with a 30 <br /> inch drop, required to advance a split-spoon sampler one foot. <br /> Qu: Unconfined compressive strength, tons per square foot(tsf) <br /> Qp: Calibrated hand penetrometer resistance, tsf <br /> MC: Moisture Content, % <br /> LL: Liquid Limit PL: Plastic Limit PI: Plasticity Index <br /> Dd: Dry Density, pounds per cubic foot(pcf) <br /> PID: Photoionization Detector(Hnu meter) volatile vapor level, ppm <br /> SOIL RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION <br /> NON-COHESIVE SOILS COHESIVE SOILS <br /> Classifier N-Value Range Classifier Qu Range (tsf) N-Value Range <br /> Very loose 0 - 3 Very soft 0 —0.25 0 -2 <br /> Loose 3 -7 Soft 0.25—0.5 2 —5 <br /> Medium dense 7 - 15 Medium stiff 0.5— 1.0 5— 10 <br /> Dense 15 - 38 Stiff 1.0—2.0 10 - 14 <br /> Very dense 38 + Very stiff 2.0—4.0 14 - 32 <br /> Hard 4.0 + 32 + <br /> GROUNDWATER <br /> Approximate Groundwater level at time noted on soil boring log, measured in open bore hole <br /> unless otherwise noted. Groundwater levels often vary with time, and are affected by soil <br /> permeability characteristics, weather conditions, and lateral damage conditions. <br />