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TAR 1 • <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton,California <br /> WIC#204-7524-3505 <br /> Sample Measured Corrected SP TPPH B T E X MTBE Methanol Comments <br /> GW Depth GW Elev <br /> Date (ft) (ft) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MW-7 Top casing elevation (ft) 0 22 <br /> 06-Feb-97 604 -582 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA <br /> 01-Apr-97 752 -730 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA <br /> 08-Jul-97 880 -858 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA <br /> 02-Sep-97 987 -965 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 VOCs and Oxygenates by 8260 ND <br /> Oxygenate Compounds by 8260 ND except for MTBE <br /> 02-Dec-97 935 -913 000 <50 1 1 <0 50 <0 50 <0 50 25 <1000 32 ppb <br /> 29-Jan-98 690 -668 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 ND <br /> 23-Apr-98 590 -568 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 ND <br /> 29-Jul-98 724 -702 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 ND <br /> MW-8 Top casing elevation (ft) 1 47 <br /> 06-Feb 97 780 -633 000 76000 800 6000 3000 12000 <1250 NA <br /> 02-Apr-97 904 -757 000 86000 670 5600 3400 16000 7400 NA <br /> 08-Jul-97 974 -827 000 70000 700 1400 2000 8400 30000 NA <br /> VOCs by 8260 ND except for n-Butylbenzene 360,sec <br /> Butylbenzene 100, Ethylbenzene 2100, <br /> isoproplybenzene 210 Naphthalene 280 n <br /> Propylbenzene 790,Toluene 720,1,2,4- <br /> Tnmethylbenzene 5100 1,3 5-Tnmethylbenzene 1500, <br /> Xylenes 9400 All in ppb <br /> 02-Sep-97 1074 NA 000 83000 530 590 1700 6600 6700 <10000 Oxygenates by 8260 ND except for MTBE 420 ppb <br /> Oxygenate Compounds by 8260 ND except for MTBE <br /> 02-Dec-97 11 08 -961 000 430000 3700 900 2600 9000 7100 <10000 250 ppb <br /> Oxygenate Compound by 8260 ND except for MTBE <br /> 29 Jan-98 864 -717 000 <50 <0 50 <0 50 <0 50 <0 50 40 19000 48000 ppb <br /> Oxygenate Compounds by 8260 ND except for MTBE <br /> 23-Apr-98 789 -642 000 41000 4700 470 620 1100 130000 53000 120000 ppb and TAME 1100 ppb <br /> Oxygenate Compounds by 8260 ND except for MTBE <br /> 29-Jul-98 857 -710 000 17000 480 210 510 1100 6900 14000 4400 ppb <br /> MW-9 Top casing elevation (ft) 1 27 <br /> 02-Dec-97 1082 -955 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1000 Oxygenate Compounds by 8260 ND <br /> 240-0783 5 <br />