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TABLE 12 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-0137, 1605 SOUTH EL DORADO STREET,STOCKTON,CA <br /> Ground- <br /> Casing Depth to water Ethyl- Total TPH as TPH as Ethylene Total <br /> Monitoring Sample Elevation Water Elevation Benzene Toluene benzene Xylenes gasoline diesel MTBE Dibromide Lead <br /> Well Date (feet msl) (feet) (feet msl) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) <br /> VEW2 07/15/98 NM 2601 NC 1 2 <0 5 <0 5 0 84 <50 NA 100 NA NA <br /> 10/14/98 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 359 NA NA <br /> 07/30/99 2666 NC <0 5 <0 5 <0 5 110 65 9b NA 566 NA NA <br /> 10/28/99 2791 NC <1 0 <1 0 <10 <1 0 <50 NA 44 NA NA <br /> 01/31/00 2802 NC <10 <10 <1 0 <10 <50 NA 13 NA NA <br /> 04/17/00 2561 NC <1 <1 <1 <1 <50 NA 23 NA NA <br /> 07/30/00 2621 NC <0 5 <0 5 <0 5 <0.5 <50 NA 21121a NA NA <br /> a=Confirmatory value,analysts by EPA Method 8260 <br /> b=Laboratory reported unidentified hydrocarbons C6-C12 <br /> TPH=Total Petroleum Hydrocarbons <br /> MTBE=Methyl tertiary butyl ether by EPA Method 8020 or EPA Method 8021E except where noted <br /> feet msl=Feet relative to mean sea level <br /> NA=Not analyzed <br /> NM=Measurement not taken <br /> NC=Not calculated <br /> NS=Not sampled <br /> Page 9 of 9 <br />