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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR I DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> i <br /> Wal!—graded gravels or gravel and Inorganic silts and very fine sands, <br /> sand mixtures, little or no fines ML rock flour, silty or clayey fine <br /> Poorly—graded gravels or gravel SILTS sands or clayey silts with slight <br /> GRAVEL G? sand mixture little or no fines AND lasticct <br /> AND CLAYS Inorganic clays or low to medium <br /> GRAVELLY Silty <br /> gravels gravel—sand—slit LL <50 CL plasticity, gravelly clays, sandy <br /> SOLS Gu mixtures clays, lean clays <br /> Clayey grovels, gravel--sand—clay organic sifts and organic slit—clays <br /> COARSE C GRAINED mixtures FINE OL of low plasticity <br /> SOILS sW Will—graded sands or gravelly GRAINED Inorgonic clays or low to medium <br /> sands, little or no fines SOILS MH plosticity, gravelly clays sandy <br /> SAND sp Poorly—graded Sands or gravelly SILTS clays lean clays <br /> AND sand mixture little or no fines AND Inorganic clays of high plasticity, <br /> SANDY CLAYS CH fat clays <br /> SOILS SM Silty sands, sand—silt mixtures LL >50 OH Organic clays of medium to high <br /> plasticity <br /> SC Clayey sands, sand—silt mixtures HIGHLSY ORGANIC OILS PT I pew and other highly organic sods <br /> ❑ Sand pixie <br /> Depth through which <br /> sampler is driven <br /> ■ Bentonite annular seal <br /> ■ Relatively undisturbed sample <br /> Neat cement annular seal <br /> Missed sample <br /> ❑ Blank PVC <br /> T Ground water level <br /> observed In boring <br /> © Machine—dotted PVC <br /> S-10 Sample number <br /> PVC Centralizer <br /> PID Photoionization detector reading <br /> BLOW/FT REPRESENTS THE NUMBER OF BLOWS OF A <br /> 140—POUND HAMMER FALLING 30 INCHES TO DRIVE <br /> THE SAMPLER THROUGH THE LAST 12 INCHES OF AN <br /> 1$ INCH PENETRATION <br /> DASHED LINES SEPARATING UNITS OF THE LOG <br /> REPRESENT APPROXIMATE BOUNDARIES ONLY <br /> ACTUAL BOUNDARIES MAY BE GRADUAL. LOGS <br /> REPRESENT SUBSURFACE CONDITIONS IN THE <br /> BORING AT THE TIME OF DRILLING ONLY <br /> UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> �► �...,r.. AND SYMBOL KEY <br /> . . ,�lt�A ARCO Service Station No. 2188 3 <br /> BILE No 441 Wast Charier way <br /> PROJECT NO, 31009 10p9p3A SfoCicioe, California <br />