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i UNIFIED SOIL CLASSIFICATION SYSTEM: Selection of soil classification based on ASTM D2487, Standard Test Method of `w Classification of Solis for Engineering Purposes. GROUP GRAPHIC MAJOR DIVISION SYMBOL DESCRIPTION LOG e GW Well graded gravel and well graded CLEAN GRAVEL gravel with sand � Little,or No Ines CLEAR GRAVEL GP Poody graded gravel and poorly graded Over 50 percent of gravel with sand ocarso l ei n GM Silty gravel and Oty gravel with sand Q than No.4 sieve size GFViVE.S WITH FINE$ Over 12 percent GO Clayey gravel and clayey gravel with sand SW Well graded sand and wall graded sand "' FL C:W# SANDS with gravel Little or No Fines SANDS SP Poorly graded and and poorly graded Over 50 percent of sand with gravel ( coarse fraction smaller than SM Silty sand and silty sand with gravel ^, i No.4 sieve size S NDS V2M FINES I percent SC Clayey sand and clayey sand with gravel ML Inorganic silt•sandy silt,clayey silt,or gravelly silt SILTS AND CLAYS CL Inorganic leen day,sa,idy day,slity clay, M Liquid limit less than 50 percent or gravelly day a r. OL Organic silt,day,sandy silt,sandy day, f l Q gtevolly day,or gravelly silt l c iG MH Inorganic,elastic silt,sandy silt,clayey silt,or gravelly silt f SILTS AND CLAYS CH Inorganic fat day,sandy clay,silty clay, Liquid limit 50 percent or more or gravelly day _ w OH Organic day,silt,sandy-or silty,-clay. clayey-or sandy-silt,gravelly silts or clays HIGFp_Y ORGANIC SOILS PT Peat or other highly organic sail COARSE PARTICLE SIZE: DATUM: SAND FINE 0.0029 Inch to 0.017 Inch ABM Assumed Bench Mark MEDIUM 0.017 Inch to 0.079 Inch MLLW Mean Lower Low Water COARSE 0.079 Inch to 0.19 Inch MSL Mean See Level - W T-- --,-GRAVEL— ---FINE - -0.19-Inch----to- 0.75-inch— ---- _ —Other— x _ COARSE 0.75 inch to 3,00 Inches COLOR DESCRIPTION GUIDE: — COBBLE 3.00 Inches to 12.00 Inches Based on Munsell Calor System BOULDER Greeter than 12 Inches �- 3�