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3.6 Groundwater Conditions <br /> } <br /> Groundwater is present at the site at a depth of about 60 feet bgs(-32 feet mean sea level). This depth <br /> is similar to regional groundwater depths for this area of San Joaquin County (Fig. 13). The first <br /> water bearing zone groundwater flow direction.at the site is to the south and southwest based on both <br /> regional and local groundwater monitoring wells at nearby UST sites (Fig.12). Based on soil <br /> petroleum hydrocarbon contamination.patterns in the shallow subsurface it appears that chemical <br /> dispersion is likely the transport mechanism for dissolved phase petroleum hydrocarbons in shallow <br /> groundwater at this site. Total areal extent of the petroleum hydrocarbon plume in the shallow <br /> groundwater identified by groundwater grab samples as being affected is approximately 1,000 <br /> square feet or less. <br /> Groundwater chemical data from the ST&E site is limited to grab samples collected-from the first <br /> water bearing zone from each of the three soil borings. These three grab samples were analyzed by <br /> USEPA Test Method 8260B and 8015M by Kill Analytical. No volatile organic compounds were <br /> reported to be present from'all three groundwater grab samples. Concentrations of TPH-mo were <br /> P <br /> I, all reported below analytical'method detection limits. Concentrations of TPH-d ranged from non- <br /> detect to a maximum of 150 ug/l.. <br /> 3.7 Geotracker Submission <br /> The ST&E site site was submitted to the State of California State Water Resources Control Board <br />` Geotracker program in December, 2007. The site is identified as site T 0607700853. All workplans <br /> and reports for the site submitted to PHSEHD have been submitted to the Geotracker site. In <br /> addition, analytical data in the form of EDF files have been uploaded to the Geotracker site. <br />` Environmental\STETARSCR09102008.wpd 22 <br /> i <br /> I <br />