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' UNIF& SOIL CLASSIFICATION STEM <br /> TMAJORIVISIONS SYMBOL CODE TYPICAL NAMES <br /> GW tiq�b.a.4�v Well graded gravels or gravel-sand mixtures, little or no fines <br /> RAVELS GP Poorly graded gravels or gravel-sand mixtures,little or no fines <br /> ( ore than 50% of <br /> o.N coarse fraction > GM 0 0 o Silty gravels,gravel-sand-silt mixtures <br /> w <br /> IN no. 4 sieve size) <br /> Z > GC 0 <br /> E-( Clayey gravels,gravel-sand-clay mixtures <br /> o m <br /> N <br /> " Well graded <br /> SANDS SWsands or gravelly sands,little or no foes <br /> aC <br /> Sp Poorly graded sands or gravelly sands,little or no fines <br /> (50%or more of <br /> coarse fraction < SM Silty sands, sand-silt mixtures <br /> no. 4 sieve size) <br /> SC Clayey sands,sand-clay mixtures <br /> ML Inorganic silts and very fine sands,rock flour,silty or clayey fine sands or clayey sills <br /> with slight plasticity <br /> SILTS & CLAYS Inorganic clays of low to medium plasticity,gravelly clays,sandy clays,silty clays, <br /> o $d LL < 50 CL lean clays <br /> N N <br /> °w u & OL Organic silts and organic silty clays of low plasticity <br /> 0.0 <br /> `o N <br /> MH i l i'i'i i i i i Inorganic silts,micaceous or diatomaceous fine sandy or silty soils,elastic silts <br /> w o i? SILTS & CLAYS <br /> Z e v CH Inorganic clays of high plasticity,fat clays <br /> LL > 50 <br /> OH Organic clays of medium to high plasticity,organic silty clays,organic silts <br /> HIGHLY ORGANIC SOILS Pt ----— Peat and other highly organic soils <br /> ROCK RX Rocks,weathered to fresh <br /> OTHER SYMBOLS <br /> = Drive Sample: 2-1/2" O.D. GRAIN SIZE CLASSIFICATION <br /> Modified California sampler <br /> = Drive Sample: no recovery CLASSIFICATION RANGE OF GRAIN SIZES <br /> = SPT Sample U.S.standard Grain Size <br /> Sieve Size in Millimeters <br /> = Initial Water Level BOULDERS Above 12" Above 305 <br /> Zf = Final Water Level COBBLES 12"to 3" 305 to 76.2 <br /> — — — = Estimated or gradational GRAVEL 3"to No.4 76.2 to 4.76 <br /> material change line coarse(c) 3"to 3/4' 76.2 to 19.1 <br /> = Observed material change line fine(f) 3/4"to No,4 19.1 to 4.76 <br /> Laboratory Tests SAND No.4 to No.200 4.76 to 0.074 <br /> coarse(c) No.4 to No. 10 4.76 to 2.00 <br /> PI = Plasticity Index medium(m) No. 10 to No.40 2.00 to 0.420 <br /> fine(f) No.40 to No,200 0.420 to 0.074 <br /> EI = Expansion Index <br /> UCC = Unconfined Compression Test SILT&CLAY Below No.200 Below 0.074 <br /> TR =Triaxial Compression Test <br /> GR = Gradational Analysis (Sieve) <br /> K = Permeability Test <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MOUNTAIN HOUSE STORM WATER DETENTION ASIN DA ENO; /05504 .05 <br /> WALLACE KUHL&ASSOCIATES,INC. <br /> GEOTECHNICAL ENGINEERING Tracy, California FIGURE B5 <br /> GEOLOGIC&ENVIRONMENTAL SERVICES <br />