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DRILLING & SAMPLING SYMBOLS LABORATORY TEST SYMBOLS <br />SYMBOL DEFINITION SYMBOL DEFINITION <br />C.S. Continuous Sampling W Moisture content-percent of dry weight <br />P.D. 2-3/8” Pipe Drill D Dry Density-pounds per cubic foot <br />C.O. Cleanout Tube LL, PL Liquid and plastic limits determined in <br />accordance with ASTM D 423 and D 424 <br />3 HSA 3 ¼” I.D. Hollow Stem Auger Q Unconfined compressive strength-pounds per <br />u <br />square foot in accordance with ASTM D <br />2166-66 <br />4 FA 4” Diameter Flight Auger <br />6 FA 6” Diameter Flight Auger <br />2 ½ C 2 ½” Casing <br />4 C 4” Casing Additional insertions in Qu Column <br />D.M. Drilling Mud Qp Penetrometer reading-tons/square foot <br />J.W. Jet Water S Torvane reading-tons/square foot <br />H.A. Hand Auger G Specific Gravity – ASTM D 854-58 <br />NXC Size NX Casing SL Shrinkage limit – ASTM 427-61 <br />BXC Size BX Casing pH Hydrogen ion content-meter method <br />AXC Size AX casing O Organic content-combustion method <br />*Grain size analysis <br />SS 2” O.D. Split Spoon Sample M.A. <br />2T 2” Thin Wall Tube Sample C* One dimensional consolidation <br />* <br />3T 3” Thin Wall Tube Sample QTriaxial Compression <br />c <br /> * See attached data Sheet and/or graph <br />Water levels shown on the boring logs are the levels measured in the borings at the time and under the conditions indicated. In sand, <br />the indicated levels can be considered reliable ground water levels. In clay soils, it is not possible to determine the ground water <br />level within the normal scope of a test boring investigation, except where lenses or layers of more pervious water bearing soil is <br />present and then a long period of time may be necessary to reach equilibrium. Therefore, the position of the water level symbol for <br />cohesive or mixed soils may not indicate the true level of the ground water table. The available water level information is given at <br />the bottom of the log sheet. <br />DENSITY CONSISTENCY <br />TERM“N” VALUETERM“N” VALUE <br />Very Loose 0-4 Soft 0-4 <br />Loose 5-8 Medium 5-8 <br />Medium Dense 9 – 15 Rather Stiff 9 – 15 <br />Dense 16 – 30 Stiff 16 – 30 <br />Very Dense Over 30 Very Stiff Over 30 <br />Standard “N” Penetration <br />: Blows per foot of a 140 pound hammer falling 30 inches on a 2 inch OD split spoon. <br /> Boulders Over 3” <br />TERMS RANGE <br />Trace 0-5% Gravel - Coarse ¾” – 3” <br />A little 5-15% Medium #4 – ¾” <br />Some 15-30% Sand - Coarse #4 - #10 <br />With 30-50% Medium #10 - #40 <br /> Fine #40 - #200 <br /> Silt and Clay Determined by plasticity characteristics. <br />Note <br />: <br />Sieve sizes are U.S. Standard. <br />11 <br /> <br />