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1, �y <br /> 1.0 INTRODUCTION response to a request by <br /> being submitted in resp ental <br /> This report is Public Health Services Environmental <br /> o at the <br /> the San Joaquin County a subsurface investigation <br /> Health Division for Thornton, <br /> Gardner propertyr 26056 Thornton Road, <br /> (Figura 1) - gasoline storage <br /> tember 6, 1989. three undergroundWestern Meter <br /> on Sep ro Oct site i samples were <br /> were removed at the P j 2 Sail The <br /> tanks CA (Figure ) - <br /> Service of Stockton, tank and the associated piping. <br /> ipto luene, <br /> were analyzed for benzene, <br /> collected beneath ear petroleum hydrocarbons <br /> sail samples total p and ethylene <br /> ethylbenzene, xylenes (tra e 1 lead (TEL), utilizing <br /> as gasoline (TPHG) , tetra ethyl Dabs <br /> EUB) , by California water Soil samples <br /> dibromide ( and DHS methodolog <br /> appropriate EPA tanks Contained moderate <br /> parts <br /> xylenes. (1.2 to m2 parts <br /> collected from beneath ethylbenzene andTxPHG (50-530 pP ) • <br /> to high levels of as well as Table 1. The <br /> per <br /> million (ppm)) summarized in documentation <br /> analytical results are endix I. The <br /> laboratory data sheets and chain-of-costo Y of petroleum <br /> from the tank removal areconcentrations included in pp <br /> elevated it soil samples indicated father <br /> Presence of the tank P <br /> hydl and <br /> rocar$ons in aired to determine. the laterasite. <br /> the project <br /> investigation would be req described later in <br /> �xteverticalmethods <br /> for f the investigationo are <br /> Field m <br /> this report. <br /> 2.0 SITE DESCRIPTION <br /> 2.1 Topographic and Cultural Features <br /> in the City of <br /> Highway 5, in San <br /> The project site is situated on level terra n of the area <br /> + California, near Interstate industry <br /> Thornton, Figure 1). The p <br /> Joaquin County ( farming* <br /> is light industrial and <br /> 2.2 Geology and Hydrology end the <br /> situated at the southern t trending <br /> The project site is art of the large northwest <br /> of California. <br /> Sacramento Valley, P sequence of sediments <br /> Sedimentary trough termed the Central <br /> seq a These <br /> Valley contains some places. <br /> The Sacramento depth of 3.0 miles in Holocene <br /> which reach a geologic age from Jura dapests. Near <br /> sediments range ir. 9 continental river <br /> and include both marine and interbedded and <br /> surface deposits are derived Brom flood and overba rained <br /> of irregularly <br /> layers of fine to coarse g <br /> deposits consisting <br /> discontinuous <br /> unconsolidated sediments. <br /> 1 <br /> .,®mow <br />