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INTERZONAL TECHNOLOGY GORPQRATIO.N:T <br /> San Joaquin .County;-"as wellas state records,�indicate that.groundwater flows nortlieastward <br /> beneath the site and .occurs at about 40-50 feet below.surface:. <br /> Pacific Bell facility UE042 presently-contaiis three 25,OW gallon diesel UST's which supply <br /> fuel to electric gators.. - <br /> 1.3 Site History <br /> Th' <br /> e county <br /> and -city have:few:records� f th. <br /> - - ri ry o e_s te.. The:site,had been.owned � _ <br /> b AT&T fr m <br /> the.mid-1940's:until;1.963 y when"a grant deed .was issued to Pacific Bell <br /> . - - <br /> - In December 1990, two diesel UST s 300 gallon and 550 allan were}closed m lace b <br /> ' ( g g ) Y. <br /> filling with a,cement slurry. Several borings were hah&bored beneath-the'tanks and total. <br /> - <br /> - petroleum-hydrocarbons expressed-as diesel were found -m:the soil as"high as22,000 ppm. . <br /> 'The present investigation is:be <br /> ung`perfarmed-clue to.flus_finding. <br /> }_ <br /> 1.4 Site-Geoio /H dro` e_ol The site-is underlain by unconsolidated fluvial sediments rang g from clays-to-sands and._ - <br /> mucks, peau and:other organic-rich sods. These in turn overheyother, fluvial deposits <br /> Groundwater beneath th67 site occurs at about 40-50`feet and flows to the northeast. This flow <br /> direction:is dominated by iinfiitration'from the Port.of Stockton slough and' other:offshoots of <br /> ` the San Joaquin-River_(located to the west and southwest-of the'site) and groundwater <br /> wididrawal from numerous:water supply wells`(located to-the east of the site at a=distance.' <br /> greater than a' nihe)• <br /> tZL <br /> : f^ MZM9-28-92JENG/083 M M' 2 <br />