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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW o 6'2 Well graded gravels or gravel - sand mixtures little or no fines <br /> GRAVELS <br /> V) — Gp O o '00 Poorly graded gravels or grovel — sand mixtures tittle or no fines <br /> w o m (More than 1/2 of <br /> N N <br /> N w m coarse fraction > GM Silty gravels grovel — sand — silt mixtures <br /> ' a �N no 4 sieve size) <br /> Q -" a GC Clayey gravels gravel — sand — clay mixtures <br /> co <br /> o SW * * Well graded sands or gravelly sands little or no fines <br /> N i N SANDS <br /> ' a: o Sp Poorly graded sands or gravelly sands fettle or no fines <br /> ° C (More than 1/2 of <br /> coarse froction < 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 salty or clayey <br /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> rn' y N Inorganic clays of low to medium plcstiaty gravelly clays o — (A CL sandy clays silty clays lean clays <br /> N 0 'V LL < 50 <br /> o N 2 OL Organic silts and organic silty clays of low plasticity <br /> w m <br /> Z <br /> I i 111 Inorganic slits micaceous or diatomaceous fine sandy <br /> aSILTS & CLAYS MH <br /> " I 1111 i I i i i i a or silty soils elastic silts <br /> w m ° <br /> Z `o c CH <br /> Inorganic clays of high plasticity fat clays <br /> V <br /> ' LL > 50 Organic clays of medium to hi h plasticity g Y g P Y organic <br /> OH \\i\NNNN <br /> silty clays organic silts <br /> HIGHLY ORGANIC SOILS Pt ——— Peat and other highly organic soils <br /> CONSISTENCY CLASSIFICATION GRAIN SIZE CLASSIFICATION <br /> 1COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/ft* Description Blows/ftUS 5tandard Grain Size <br /> Sieve size in Millimeters <br /> Very Soft < 3 Very Loose < 5 <br /> ' BOULDERS Above 12" Above 305 <br /> Soft 3 — 5 Loose 5 — 15 <br /> medium (firm) 6 — 10 Medium Dense 16 — 40 COBBLES 12" to 3" 305 to 762 <br /> Stiff 11 — 20 Dense 41 — 65 GRAVEL 3" to No 4 762 to 476 <br /> ' Very Staff 21 — 40 Very Dense > 65 coarse (c) 3" to 3/4" 762 to 191 <br /> fine (f) 3/4 to No 4 191 to 4 76 <br /> Hard > 40 <br /> *Blows/ft—lower 12 inch interval of drive or as noted SAND No 4 to No 200 4 76 to 0 074 <br /> ' 140 Ib hammer 30" drop Colifornio Sampler coarse (c) No 4 to No 10 475 to 200 <br /> medium (m) No 10 to No 40 2 00 to 0 420 <br /> OTHER SYMBOLS fine (f) No 40 to No 200 0420 to 0074 <br /> SILT do CLAY Belo. No 200 Below 0 074 <br /> Q = Soil Sample <br /> = Initial Water Level <br /> Xf= Final Water Level <br /> Estimated or gradational material <br /> change line <br /> = Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 2307 02 <br /> 1444 MARIPOSA ROAD DATE 5/93 <br /> WALLACE - YUHL di: ASSOCIATES, INC <br /> GEOTECHNICAL ENGINEERING Stockton, California PLATE NO 14 <br /> GEOLOGIC A ENVIRONMENTAL SERVICES <br />