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Table 1 Groundwater Elevations and Sample Analytical Results t Former E-Z Serve Location No 100966 2537 Waterloo Road, Stockton,California Well No Sampling TOC DTW GWEr PSH TPHg B T E X MTBE ' (screened mterval) Date (feet) (feet) (feet) (feet) (gg/l.,) (µg/L) (µg/L) (ltg/L) (gg/L) OWL) VW-3 5/31/2002 2102 52 10 -3108 000 <500 <0 50 <0 50 <0 50 <1 5 3 7 (55'-651) 8/20/2002 2102 5808 -3706 000 <50 16 24 <0 50 17 3 7 cont 11/20/2002 2102 1819 -3747 0 00 63 <0 5 <0 5 <0 5 <0 5 36 1/16/2003 2102 5564 -3462 000 140 77 32 14 91 48 4/16/03 2102 5324 -3222 000 580 <0 5 <0 5 06 15 180 ' Notes Latest analytical results above their respective laboratory detection limas are to boldface font No known groundwater monitoring or sampling was conducted between December 9, 1994 and September 17, 1996 and November 6,2001 TOC =Top of casing referenced to City of Stockton Benchmark No 63[elevation=20 87 feet above mean sea level] DTW =Depth to water measured from top of casing GWE =Groundwater elevation as referenced to benchmark to feet above mean sea level PSH =Phase Separate Hydrocarbon thickness TPHg =Total Petroleum Hydrocarbons as gasoline(EPA Method 8015) B =Benzene(EPA Method 602 or 8020/1) ' T =Toluene(EPA Method 602 or 802011) E =Ethylbenzene(EPA Method 602 or 8020/1) X =Total Xylenes(EPA Method 602 or 802011) MTBE =Methyl t-Butyl Ether(EPA Method 8020 or 8021) µg/L=Micrograms per liter(--parts per billion) (70'-90') =Well screen interval(in feet below ground surface) < =Sample reported as"not detected,"to previous tables,reporting limit not known =If PSH present,corrected GWE=TOC-Measured DTW+Corrected PSH ' Thickness(PSH Thickness x gas density[0 75 g/ce]) 2 =MTBE analysts performed by EPA Method 8260 beginning on November 6,2001 --=Not measured,surveyed,sampled,or analyzed S T ZServa11009665Raparts\EZ9WGWRO02 Page 6 of 6