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GROUND WATER MONITORING DATA <br /> Exxon Service Station No 7-0137 <br /> 1605 S El Dorado Street <br /> Stockton,California <br /> Ground <br /> Casing Depth to Water Ethyl- Total TPPH as TEPH as Ethylene Total <br /> Monitoring Sample Elevation Water Elevation Benzene Toluene benzene Xylenes gasoline diesel MTBE Dibromide Lead <br /> Well Date (ft msl) (ft) (ft msl) (µg/L) (µg/L) (µg/L) (µg/L) (µg(L) (µg/L) (µg/L) (µg/L) (µg/L) <br /> VEW-1 07/15/98 NM DRY NC NS NS NS NS NS NS NS NS NS <br /> 10/14/98 DRY NC NS NS NS NS NS NS NS NS NS <br /> 01/26/99 DRY NC NS NS NS NS NS NS NS NS NS <br /> 05/19/99 Dry NC NS NS NS NS NS NS NS NS <br /> VEW-2 07/15/98 NM 2601 NC 12 <0 5 <0 5 0 84 <50 NA 100 NA NA <br /> 10114/98 2728 NC <0 5 <0 5 <0 5 <0 5 <50 NA 190 NA NA <br /> 01/26/99 2697 NC 051 <0 5 <0 5 <0 5 <50 NA 100 NA NA <br /> 05/19/99 2556 NC 0 707 <0 5 <0 5 <0 5 <50 NA 35 9 NA NA <br /> Trip Blank 10/14/98 NIA NIA NIA <0 5 <0 5 <0 5 <0 5 <50 NA <2 5 NA NA <br /> 01/26/99 NIA NIA <0 5 <0 5 <0 5 <0 5 <50 NA <2 5 NA NA <br /> Confirmatory value calculated by EPA Method 8260 for the sample with the highest value measured at the site by EPA Method 8020 <br /> b Laboratory reported unidentified hydrocarbons <br /> TPPH=Total purgeable petroleum hydrocarbons <br /> TEPH—Total extractable petroleumm hydrocarbons <br /> MTBE=Methyl tertiary butyl ether <br /> ft rml-Feet relative to mean sea level <br /> NA=Not analyzed <br /> NM=Not measured <br /> NC—Not calculated <br /> NS-Not sampled <br /> NIA-Not applicable <br /> 1 <br /> (Page 8 of 8)99 865 xh <br />