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ORI <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton,California <br /> WIC#204-7525-0104 <br /> Measured Corrected Total Total Fecal <br /> Sample GW Depth GW Elev SP TPPH 11T E X MTBE Lead Coliform Coliform Methanol dO dO Comments <br /> Date (MPN/ (MPN/ <br /> (ft) (ft) (ft) (u L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/1) 100ml) 100ml) Lug/L) (mg/L) Method <br /> 10-Feb-98 3755 6234 000 67000 7940 13000 1200 1 7300 1 940 NA NA NA <1000 NA I NA Oxygenate Compounds by EPA 8260 ND <br /> 20-May-98 3447 65-42 000 38000 8600 1 130001 1200 1 6900 1 <250 1 NA NA NA NA NA j NA Oxygenate Compounds byEPA 8260 ND <br /> MW-7(DUP) <br /> 20-May-98 NA NA NA 1 40000 1 8000 1 120001 1100 1 6500 1 <250 NA I NA NA NA NA NA Oxygenate Compounds by EPA 8260 ND <br /> VEW-1 II I I I I I 1 77714 <br /> 05-Sep-96 1 1 1892 NA 1 000 1 3500 1 55 1 60 1 410 1 380 1 93 NA NA NA NA NA NA MTBE by EPA 8260 91 ppb <br /> VEW-2 <br /> 05-Sep-96 NA I NA NA NA NA NA NA NA NA NA NA NA NA NA NA Well Dry <br /> 26-Nov-96 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1 NA Well Dry <br /> 26-Feb-97 NA NA NA I NA NA NA NA NA NA NA NA NA NA NA I NA Well Dry <br /> 10-Jun-97 NA NA NA NA NA NA NA NA NA NA NA NA NA NA I NA Well Dry <br /> 22-Aug-97 NA I NA NA NA NA NA NA NA NA NA NA NA NA NA I NA Well Dry <br /> 09-Oct-97 NA I NA NA NA NA j NA NA NA NA NA NA NA NA NA I NA Well Dry <br /> 10-Feb-98 38 01 NA 0 00 120000 4500 20000 1800 26000 <1000 NA I NA I NA 1 <5000 NA I NA Oxygenate Compounds by EPA 8260 ND <br /> 20-May-98 3481 NA 000 120000 4200 20000 1900 240001 <2500NA I NA I NA NA NA I NA Oxygenate Compounds by EPA 8260 ND <br /> Abbreviations, <br /> <x=Not detected at detection limit of x <br /> NA=Not analyzed or not available <br /> MPN/100ml=Most Probable Number(MPN)of bacteria per one hundred milliliters <br /> (DUP)=Duplicate sample <br /> SP=Separate Phase hydrocarbon <br /> TPPH=Total Purgeable Petroleum Hydrocarbons carbon range C6 to C12 by EPA Method 8015(Modified) <br /> (previously reported as Total Petroleum Hydrocarbons as Gasoline) <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl tertiary butyl ether by EPA Method 8020 <br /> Oxygenates= tertiary butanol(TBA) methyl-tertiary butyl ether(MTBE),di isopropyl ether(RIPE),ethyl tertiary butyl ether(ETBE), <br /> and tertiary-amyl methyl ether(TAME)by EPA Method 8260 <br /> 240 0854 6 <br />