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' MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> GW Well-graded gravels or gravel-sand ML Inorganic silts and very fine sand,rock <br /> mixtures, little or no fines flour,silty or clayey fine sands,or <br /> ' GRAVEL SILTS clayey silts with slight plasticity — <br /> AND GP Poorly-graded gravels or gravel-sand <br /> GRAVELLY mixture, little or no fines AND Inorganic clays of low to medium <br /> CLAYS CL plasticity,gravelly clays,sandy clays, <br /> ' SOILS GM Silty gravels,gravel-sand-silt mixtures LL<50 silty clays, lean clays <br /> Clayey gravels, gravel-sand-clay OL Organic silts and organic silt-clays of <br /> COARSE GC mixtures FINE low plasticity <br /> ' GRAINED GRAINED <br /> SOILS SOILS Inorganic silts, micaceous or <br /> SW Well-graded sands or gravelly sand, MH diatomaceous fine sandy or silty soils, <br /> S <br /> SAND little or no fines elastic silts <br /> SILT <br /> AND Poorly-graded sands or gravelly ANDCH Inorganic clays of high plasticity,fat <br /> SANDY SP sands,little or no fines CLAYS clays <br /> SOILS LL>50 <br /> SM Silty sands,sand-silt mixtures �OH Organic clays of medium to high <br /> plasticity _ <br /> SC Clayey sands,sand-clay mixtures HIGHLY ORGANIC Pt Peat and other highly organic soils <br /> SOILS <br /> Recovery Symbol Codes <br /> Sample collected for chemical analysis <br /> ' Interval of recovered soil core collected with split-barrel continuous sampler <br /> NInterval of recovered soil core collected with split-spoon drive sampler <br /> i <br /> ® Interval of no recovery <br /> ' Boring Symbols Code <br /> Grout Filter material a Well casing Q First Water Level <br /> Bentonite Fill material Well screen If Final Water Level <br /> i <br /> ' 1.Dashed lines separating soil strata on the boring logs represent inferred boundaries between sampled intervals that <br /> may be abrupt or gradual transitions. Solid line represent approximate boundaries observed within sampled <br /> intervals. <br /> i2.Soi1 color described according to Munsell Soil Color Chart, 1990 Edition,revised. <br /> 3.OVM=organic vapor meter reading in parts per million(ppm);the maximum concentration range of the OVM is <br /> 10,000 ppm;O.R. is> 10,000 ppm. <br /> ' C3769/3769-01 02/11/97 <br /> EXPLANATION OF BORING LOGS Project No. <br /> GEOMATRIX CHEVRON PROPERTY AT 990 BEECHNUT AVENUE C3769 <br /> Tracy, California Figure <br /> A-1 <br />