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MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> ! well—graded gravels or gravel—sand mixtures little or no <br /> CLEAN GRAVELS GW fines <br /> ' GRAVELS WITH , <br /> ESS THAN 15% FINES GP = Poorly graded gravels or gravel—sand mixtures little or no <br /> LJ fines <br /> rV <br /> (ri MORE THAN 1/2 OF <br /> W COARSE FRACTION> GRAVELS GM I Silty gravels gravel—sand mixtures <br /> ' Ow <br /> V, No 4 &EVE SIZE WiTH <br /> m <br /> o OVER 15% FINESGG Clayey gravels gravel—sand--clay mixtures <br /> Li <br /> z o <br /> N <br /> ' a o CLEAN SANDS SW Well—graded sands or gravelly sands little or no fines <br /> ' zSANDS WITH <br /> A <br /> ESS THAN 15% FINES <br /> a 0 SP 1 Poorly graded sands or gravelly sands little or no fines <br /> p MORE THAN 1/2 OF <br /> wCOARSE FRACTIONG <br /> p No 4 SIEVE SIZE SANDS SM Silty sands sand—silt mixtures <br /> WITH <br /> OVER 15% FINES SC Clayey sands sand--clay mixtures <br />' udM L Inorganic silts and very fine sands rock flour silty or <br /> '"' clayey fine sands or cEcyey silts with slight plasticity <br /> U1 SILTS & CLAYS <br /> cn WCL Inorganic clays of Sow to medium plasteity gravelly clays <br /> � > <br /> sandy clays silty clays lean clays <br />' N LIQUID LIMIT 50% OR LESS <br /> O 0 OL I I I Organic silts and organic silty clays of low plasticity <br /> Z N <br /> � o Vnorgan c silts micaceous or diatomaceous fine sandy or <br /> 0Z MH silty sods elastic spIts <br />' z o SILTS & CLAYS <br /> in C H Inorganic clays of high plasticity fat clays <br /> X LIQUID LIMIT GREATER THAN 50% <br /> o OH Organ,e clays of medium to high plasticity organic silty <br /> clays organic silts <br /> HIGHLY ORGANIC SOILS PT Peat and other highly organic sous <br /> SYMBOLS KEY <br /> GRAIN SIZE CHART <br /> Undisturbed Sample RANGE OF GRAIN SIZES <br /> CLASSIFICATION U S Standard Grain Size <br /> Bulk or Classrficatjon Sample Sieve Size in Millimeter's <br /> BOULDERS Above 12' Above 305 <br /> Sample analyzed <br /> COBBLES 12 ' to 3' 305 to 76 2 <br /> First-encounteredgroundwater level GRAVEL 3 to No 4 76 2 to 4 75 <br /> coarse 3 to 3/4 76 2 to 19 1 <br /> Stant groundwater level fine 3/4 to No 4 19 1 to 475 <br />' SAND No 4 to No 200 475 to 0075 <br /> (10YR4/4) Munsell soil color coarse No 4 to No 10 4 75 to 2 00 <br /> 1990 edition medium No 10 to No 40 2 00 to 0 425 <br />' ® Hydropunch fine No 40 to No 200 1 0 425 to O o75 <br /> SILT & CLAY Below No 200 Below 0 075 <br /> SOURCE ASTM D 2488-90 based on Unified Soil CIOSS&cOtiOn System <br /> Harding Lawson Associates Soil Classification Chart and Key to Boring Logs PLATE <br /> Tri Valle Growers — Plant T <br />' - — Engineering and Y <br /> Environmental Services 26200 Nowell Rood Al <br /> Thornton, California <br /> DRAWN PROJECT NUMBER—TASK APPROVED DATE REVISED DATE <br />' YG 38737 008 10/99 <br />