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I <br /> I <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW o 1' Well graded gravels or gravel — sand mixtures little or no fines <br /> GRAVELS O o O Q <br /> to = ^ GR Poorly graded gravels or grovel — sand mixtures, little or no fines <br /> fA o �, (More than 1/2 of <br /> ' m coarse fraction > GM Silty gravels, grovel — sand — silt mixtures <br /> 0 o w no 4 sieve size) <br /> z GC Clayey gravels, gravel — sand — clay mixtures <br /> M <br /> cX o a 5W t 4 '_ : 4Well graded sands or gravelly sands, little or no fines <br /> V) SANDS <br /> WW- <br /> c SP Poorly graded sands or gravelly sands, little or no fines <br /> oa (More than 1/2 of <br /> A 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 /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> N <br /> N Inorganic clays of low to medium plasticity gravelly clays, <br /> CL sandy clays silty clays, lean clays <br /> 00q, LL < 50 <br /> o N 'm OL Organic slits and organic silty clays of low plasticity <br /> ' Z \ N <br /> a o a I I t i l i l I l I i l Inorganic silts, micaceous or diatomaceous fine sandy <br /> " ZF N SILTS & CLAYS MH I I i 1,I i i i i i i or silty sods elastic silts <br /> Li m a <br /> ' 0 = CH Inorganic clays of high plasticity fat clays <br /> V <br /> LL > 5D �� Organic clays of medium to high plasticity organic <br /> OH ........ silt clays, organic silts <br /> .�...... Y Y 9 <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/ft« US Standard Grain Size <br /> ' <br /> Steve sae 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 76 2 to 4 76 <br /> Very Stiff 21 — 40 Very Dense > 65 coarse (c) 3" to 3/4" 762 to 191 <br /> line(f) 3/4" to No 4 191 to 476 <br /> Hard > 40 <br /> ' <br /> Blows/ft—lower 12 inch interval of drive, or as noted SAND No 4 to No 200 4 76 to 0074 <br /> 140 Ib hammer 30" drop California Sampler coarse (c) No 4 to No 10 4 76 to 2 00 <br /> medium (m) No t0 to No 40 200 to 0 420 <br /> OTHER SYMBOLS fine (f) No 40 to No 200 0420 to 0074 <br /> ' SILT & CLAY Below No 200 1 Below 0 074 <br /> Q = Soil Sample <br /> �i= Initial Water Level <br /> 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 " KtJHL A. ASSOCIATES, INC <br /> OSOTECHNICAL ENGINEERING Stockton, California PLATE NO 14 <br /> GEOLOGIC do ENVIRONMENTAL SERVICES <br />