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10 <br />Chevron Products Company Page 2 <br />Former Chevron Service Station 49-5775 301 West Kettleman Lane Lodi Caldorma October 12 2001 <br />Approximate Depth to Groundwater Groundwater in the A, B, and C -zone is measured at 59 to 63 <br />feet below ground surface (bgs) <br />A -zone Groundwater Gradient Groundwater flows measured in the A -zone were calculated to <br />flow from east to west under an approximate gradient of 0 01 <br />to 0 004 feet/foot Groundwater near the site appears to flow <br />radially toward extraction well EX -3 (Figure 2) <br />B -zone Groundwater Gradient Groundwater in the B -zone flows to the southeast, with an <br />approximate hydraulic gradient of 0 004 feet/foot (Figure 3) <br />DISCUSSION: <br />Between September 4 and 6, 2001, SECOR conducted Third Quarter 2001groundwater monitoring and sampling for <br />30 wells Wells were gauged on September 4, 2001, and sampled from September 4 through September 6, 2001 <br />Gauge data and sample analytical results are presented as Tables 1 and 2, respectively Groundwater elevation maps <br />for A and B -Zone wells are presented for September 4, 2001 as Figures 2 and 3 <br />During the Third Quarter 2001 sampling event groundwater samples were analyzed for total petroleum hydrocarbons <br />as gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes, methyl tertiary butyl ether (MtBE), tertiary <br />butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl tertiary butyl ether (ELBE), tertiary amyl methyl ether <br />(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 An A -zone <br />isoconcentration contour map for MtBE is presented as Figure 4 <br />I \Chevron1957751M&S\3rd Quarterfl113QMR01 doc <br />Maximum Constituent Concentrations (µg/l) <br />September 4-6, 2001 <br />Zone <br />TPHg <br />Benzene <br />Toluene <br />Ethyl- <br />Xylenes <br />MtBE <br />TBA <br />EtBE <br />TAME <br />benzene <br />A -zone <br />57 <br />15 <br />092 <br />0 21 <br />08 <br />340 <br />22 <br />49 <br />6 <br />B -zone <br /><20 <br />05 <br />092 <br />0 25 <br />1 1 <br />08 <br /><5 <br /><0 5 <br /><0 5 <br />C -zone <br /><20 <br /><0 20 <br /><0 20 <br /><0 20 <br /><0 60 <br /><0 5 <br /><5 <br /><0 5 <br /><0 5 <br />Explanations <br />µgA = Micrograms per liter <br />< Indicates the constituent was not present at or above the method reporting limit shown <br />I \Chevron1957751M&S\3rd Quarterfl113QMR01 doc <br />