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TAO <br /> WELL CONCENTRATIONS - <br /> Shell-branded Service Station <br /> 4445 Pershing Avenue <br /> Stockton,California <br /> WIC#204-7524-2408 <br /> Metha Total Organic <br /> Sample Measured Corrected SP TPPH B T E X MTBE nol EDB Lead Lead Coliform Comments <br /> Date GW Depth GW Elev total I fecal <br /> (ft) (ft) (ft) (uglL) (uglL) (ug/L) (uglL) (uglL) (ug/L) (uglL) (uglL) (ug/L) (ug/L) (MPN/100 ml) <br /> 10-Jun-97 NA NA NA <50 <0 50 <0 50 <0 50 <0 50 53 1 NA NA NA NA NA NA <br /> Oxygenate Compounds by 8260 ND <br /> 21-Nov-97 NA NA NA <50 <0 50 <0 50 <0 50 <0 50 85 <1000 NA NA NA NA NA except MTBE 11 ppb <br /> 10-Feb-98 NA NA NA <50 23 29 I <0 50 17 7_57—NA NA NA NA NA NA <br /> VEW-t <br /> Oxygenate Compounds by 8260 ND <br /> 21-Nov-97 1917 NA 000 150 <0 50 <0 50 <0 50 080 29 <1000 NA NA NA NA NA except MTBE 68 ppb <br /> 10-Feb-98 1601 NA 000 1 180 14 21 1 41 1 16 00 1 54 NA I NA NA NA NA NA <br /> 20-May-98 1368 NA 000 58 069 <0 50 <0 50 1 053 1 21 NA NA NA NA NA NA <br /> 12-Aug-98 1498 NA 000 <50 <0 50 <0 50 <0 50 1 <0 501 13 NA NA NA NA NA NA <br /> 28-Oct-98 1570 NA 000 <50 <0 50 1 <0 50 <0 50 <0 50 7-2--F NA NA NA NA NA NA <br /> i <br /> VEW-1 (DUP) j <br /> 20-May-98 NA NA NA 59 00 <0 50 <0 501 <0 50 1 <0 501 26 1 NA NA I NA I NA I NA I NA <br /> 12-Aug-98 NA I NA I NA 52 <0 50 <0 50 <0 50 1 <0 501 <2 5 1 NA NA I NA NA NA NA <br /> VEW-2 <br /> 21-Nov-97 C NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Well dry <br /> 10-Feb-98 k 1525 NA 000 NA NA NA NA NA NA I NA NA NA NA NA NA Insufficient water <br /> 20-May-98 1305 NA 000 <50 <0 50 I <0 50 <0 50 <0 50 56 I NA NA NA NA NA NA <br /> 12-Aug-98 1423 NA 000 <50 <0 50 <0 501 <0 50 I <0 50 50 NA NA NA7 NA NA NA <br /> 28-Oct-98 1483 NA 000 NA NA I NA I NA I NA NA NA NA NA I NA NA NA Insuficient water to sample <br /> Abbreviations <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 /> EDB=Ethylene dibromide <br /> BTEX=benzene,toluene,methylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiarly-butyl ether by EPA Method 8020 <br /> 240-0837 7 <br />