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Clayton <br /> 33 HYDROGEOLOGY <br /> Soil% underlying the site generally consist of clayey sands, sandy clays and gravelly <br /> sands with gravel bung more abundant nea- the surtace Sandy soils are fairly <br /> permeable and allow water and contaminants to move readily through them <br /> Appendix D contains the complete lithologu, logs recorded while drilling <br /> Depth to groundwater ranges from approximately 8 to 10 feet in the three wells <br /> Well elevations were surveyed to datum sea level by Tronoff & ASsoaaates From <br /> the well elevation data, groundwater flow direction was calculated to be N3°W, or <br /> almost directly north The groundwater gradient is 0 3 foot elevation drop per 100 <br /> feet distancz <br /> 4-0 RATORY ANA YS S <br /> 41 PURPOSE AND SCOPE <br /> Analyses were selected tr Pstablish a baseline environmental condition at the site, <br /> and to assess soil and groundwater for possible contamination from the tormer <br /> UST, from USTs upgradient of the subject site, and from the possiole previous <br /> use of pesticides onsite The soil and groundwater samples were analyzed by the <br /> following methods <br /> 0 <br /> • EPA Method 5030/8015-8020, for gasoline tuel and the volatile hydrocarbons, <br /> benzene, toluene, ethylbenzene, and xylene <br /> EPA Method 4181 for hydrocarbon oil and grease (waste oil) <br /> EPA Methods 8080(soil) and 608(water) for organochionne <br /> pesticides/polychlonnated biphenyls (PCBs) <br /> Ali samples were transported to Clayton's laboratory under chain-of-custody This <br /> form, along with copies of the analytical results, are in Appendix F <br /> 42 SOIL SAMPLE ANALYSES <br /> The results of the laboratory analyses of the soil samples are summarized in <br /> Tables 1 and 2 Table I reports only detected compounds All other compounds <br /> for which analyses were: condu„ted were below.analytical detection limits, as <br /> shown to the laboratory report (Appendix F) <br /> We compared soil simple results for hydrocarbon oil and grease to concentrations <br /> in the RWOCB's Recommendations for the -valuation and lnvesti ration of USTS <br /> These concentration level~ are listed in Table 3 <br /> . -3- <br /> _ _ t <br />