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IK Kennedy Jenks <br /> Note: The ASTM grain size scale differs from the Modified Wentworth Scale used in <br /> teaching most geologists. Also, it introduces a distinction between sorting and grading <br /> (i.e., well graded equals poorly sorted, and poorly graded equals well sorted.) <br /> • The modifying symbol W indicates good representation of a range of particle sizes in a soil. <br /> • The modifying symbol P indicates that there is a predominant excess or absence of particle <br /> sizes. <br /> • The symbol W or P is only used when a sample contains less than 15 percent fines. <br /> • Modifying symbol M is used if fines have little or no plasticity. <br /> • Modifying symbol C is used if fines have low to high plasticity (clayey). <br /> The following rules apply for the written description of the soil group name: <br /> Types of Soil Rule <br /> Sands and gravels (clean) Less than 5 percent fines <br /> Sands (or gravels)with fines 5 to 15 percent fines <br /> Silty (or clayey) sands or gravels Greater than 15 percent fines <br /> • Other descriptive information may include: <br /> - Color (e.g., Munsell Soil Color chart, specify edition). Soil color is named and coded <br /> using the Munsell Soil Color chart if required for the project. The code should be in <br /> parentheses immediately following the written description. Presence of mottling and <br /> banding is also recorded. For example, "dk brn (7.5 YR, 3/4)." <br /> - Relative Density/Penetration Resistance. For cohesionless materials use very loose, <br /> loose, medium, dense, or very dense estimated from drive sample hammer blows or <br /> other field tests. Blow counts may be used, if reliable. <br /> - Maximum grain size (fine, medium, coarse, as described in AGI data sheets or USCS). <br /> Note the largest cross-sectional dimension measured in tenths of an inch for grains <br /> larger than sand size. <br /> - Composition of grains (mineralogy) <br /> - Approximate percentage of gravel, sand, and fines (use a percentage estimation chart <br /> as provided in the AGI data sheets) <br /> Modifiers Description <br /> Trace Less than 5 percent <br /> Few 5 to 10 percent <br /> Little 15 to 25 percent <br /> Some 30 to 45 percent <br /> Mostly 50 to 100 percent <br /> - Angularity (round, subround, angular, subangular) <br /> - Shape (flat or elongated) <br /> Monitoring Well Installation Work Plan, B-4 <br /> The Wine Group, Franzia Winery, Ripon, CA <br /> P.\1 S-Proj\2003-post archive\030120.XY_GW Mon Well Support\09-Reports\piecesWPP_C SOG Borehole Log.doc <br />