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TABLE 1 WELL CONCENTRATIONS Former Shell Service Station 1267 Country Club Stockton,CA W[C# 204-7524-0204 I Measured Corrected SP TPPH TEPH B T E X MISE Methanol Comments Sample GW Depth GW Elev De th{ft) (ft) (ft) (ft) (u 1) (u L) L) (u L) (U911 (U911 (u 1) S-1 Top of Casing Elevation ft 5 24 26-Feb-98 1329 1 -809 000 1400 1200 45 45 7 2 150 <10 NA Oxygenate Compounds by EPA 8260 ND except DIPE 49 p b 06-May-98 11 59 -639 000 3800 1300 110 11 260 300 <50 NA 12-Aug-98 1267 -747 000 4000 1600 110 15 270 120 240 8300 Oxygenate Compounds by EPA 8260 ND except DIPE 38 ppb 10-Nov-98 1415 -8 95 000 2000 1100 53 54 140 1 33 <50 NA S-1 DUP 12-Aug-98NA I NA NA 1 5000 110001 110 19 29(Y 120 250 9600 Oxygenate Compounds by EPA 8260 NO except NPE 95 ppb S-2 Top of Casin Elevation ft 4 78 26-Feb-98 1228 -750 000 123000 7800 190 <20 670 1700 120 NA Oxygenate Compounds by EPA 8260 ND 06-May-98 1094 -616 000 29000 7400 240 <50 1200 2300 <250 NA Oxygenate Compounds by 8260 ND 12-Aug-9B 1212 -734 000 16000 6900 130 66 670 1000 180 <1000 Oxygenate Compounds by EPA 8260 ND 10-Nov-96 13_59 -8 8f 001) 19000 4100 1 100 <25 1 610 1 880 34 NA S-2 DUP 26-Feb-98 NA I NA 1NA 22000 6400 1 210 1 20 1 690 1700 130 1 NA I Oxygenate Compounds by EPA 8260 ND S-3 To of Casing Elevation ft 631 26-Feb-98 1325 -794 000 530 530 53 52 44 34 <2 5 NA Oxygenate Compounds by EPA 8260 ND except DIPE 200 ppb 06-May-98 11 58 -627 000 130 370 12 <0 50 07 10 <2 5 NA 12-Aug-98 1273 -742 000 460 390 28 <0 50 <0 50 13 410 <1000 Oxygenate Compounds by EPA 8260 ND except MTBE 200 ppb 10 Nov-98 1422 -891 DOD 400 260 1 76 1 <0 50ea 50 1 1 <2 5 NA S-3 DUP 06-May-98 NA NA NA 120 230 12 <0_52J 055 083 <2 5 1 NA S-4 I Top of Casinp Elevation ft 1630 26-Feb-98 1 1257 1 -7 27 1 0 00 1 99 1 130 1 13 06LJ 06L 17 63 <2 5 1 NA Oxygenate Compounds by EPA 8260 ND 2400943 I