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• <br />• <br />Chevron Products Company 2 <br />Fortner Chevron Service Station i19 5775 301 West Kettleman Lane Lodi California <br />1111V 13 2001 <br />Approximate Depth to Groundwater: Groundwater in the A, B, and C -zone is measured at 55 to 57 <br />feet below ground surface (bgs). <br />A -zone Groundwater Gradient: Groundwater in the A -zone flows radially towards extraction <br />B -zone Groundwater Gradient: <br />DISCUSSION: <br />well EX -3. <br />Groundwater in the B -zone flows to the southeast, with a <br />hydraulic gradient of 0.002 to 0.003 feet/foot. <br />On May 21 and 22, 2001, SECOR conducted Second Quarter 2001groundwater monitoring and sampling, in <br />accordance with Cleanup and Abatement Order (CAO) No, 5-00-704. Groundwater monitoring and sampling was <br />performed for 30 wells. Site wells were gauged and sampled on the May 21, and 22, 2001. Gauge data and sample <br />analytical results are presented as Tables 1 and 2, respectively. Groundwater elevation maps for A and B -Zone wells <br />are presented for May 22, 2001 as Figures 2 and 3. Concentration contour maps for select chemicals are presented <br />as Figures 4 through 6. <br />During the Second Quarter 2001 sampling event groundwater samples were analyzed for total petroleum <br />hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes, methyl tertiary butyl ether <br />(MME), tertiary butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl tertiary butyl ether (EtBE), tertiary amyl <br />methyl ether (TAME), ethanol, methanol, ethylene dibromide (EDB), and 1,2-dicholoethane (1,2 -DCA). Maximum <br />concentrations of detected constituents for A, B, and C -zones are presented in the table below. <br />lAChevron1957751M&S12nd Quarter0112QMR0l.doc <br />Constituent (µg11) <br />Zone <br />TPHg <br />Benzene <br />Toluene <br />Xylenes <br />MtBE <br />Methanol <br />Ethanol <br />TBA <br />EtBE <br />TAME <br />A -zone <br />400 <br />78 <br /><0.50 to <2 <br />1.7 <br />1,300 <br />120 <br />95 <br />46 <br />58 <br />14 <br />B -zone <br /><50 <br /><0.50 <br /><0.50 <br />0.70 <br />0.66 <br /><50 <br />5,700 <br /><5 <br /><0.50 <br /><0.50 <br />C -zone <br />ND<50 <br /><0.50 <br />0.58 <br /><0.50 <br />1.3 <br /><50 to < 100 <br />760 <br /><5 <br /><0.50 <br /><0.50 <br />Explanations <br />< indicates the constituent was not present at or above the method reporting limit shorn <br />lAChevron1957751M&S12nd Quarter0112QMR0l.doc <br />