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f <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW 6 Well graded gravels or gravel — sand mixtures little or no fines <br /> GRAVELS <br /> on _ GP '00 d Poorly graded gravels or gravel -- sand mixtures little or no fines <br /> o a, (More than 1/2 of d d <br /> (A N <br /> V) m coarse fraction > GM Silty gravels, gravel — sand — silt mixtures <br /> M 0 1 AR 19 <br /> C'4 > no 4 sieve size) <br /> Z --- v GC Clayey gravels gravel -- sand — clay mixtures <br /> < w N <br /> L° o SW * ' * ': Well graded sands or gravelly sands little or no fines <br /> w .. N SANDS ' <br /> o <br /> o¢ c (More than 1/2 of SP Poorly graded sands or gravelly sands little or no fines <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 <br /> _ <br /> SILTS—&--CLAYS fine sands or clayey silts with slight plasticity <br /> in <br /> CL Inorganic clays of low to medium plasticity gravelly clays <br /> osandy clays silty clays lean clays <br /> a � LL < 50 <br /> o a', OL Organic silts and organic silty clays of low plasticity <br /> Z m <br /> �¢ p Q MH I I I I I I I I I I I E Enorganic silts micaceous or diatomaceous fine sandy <br /> 0 �E N I l I l i l I l i l l t or silty soils elastic silts <br /> SILTS & CLAYS <br /> iCH Inorganic clays of high plasticity fat clays <br /> v LL > 50 <br />' OH Organic clays of medium to high plasticity organic <br /> silty clays, organic silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other highly organic soils <br /> CONSISTENCY CLASSIFICATION GRAIN SIZE CLASSIFICATION <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/ft* Description Blows/ftp` U S Standard Grain Size <br /> Very Soft < 3 Very Loose < g Sieve sae in Millimeters <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 76 2 to 4 76 <br /> Very Stiff 21 — 40 Very Dense > 65 coarse (c) 3" to 3/4" 76 2 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 200 476 to 0074 <br />' 140 Ib hammer 30" drop California Sampler coarse (c) No 4 to No 10 476 to 200 <br /> medium (m) No 10 to No 40 2 00 to 0 420 <br /> OTHER SYMBp OLS fine (f) No 40 to No 200 0420 to 0074 <br /> Q = Soil Sample SILT do CLAY Below No 200 Below 0 074 <br />' <br /> 10= Initial Water Level <br /> '� -- Final Water Level <br /> Estimated or gradational material <br /> change line <br /> Observed material change line <br /> SOIL CLASSIFICATION CHARTS WitA NO 173502 <br /> NN#Oii JVM ASSOCIATES DATE 10/92 <br /> WALLACE • KUHL & ASSOCIATES, INC <br /> OHOTBCHNICAL HNCIINEERINQ Stockton, California PLATE NO 5 <br />' GEOLOGIC a ENVIRONMENTAL SERVICES <br />