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<br /> WELL CONCENTRATIONS
<br /> Former Texaco Service Station
<br /> 440 W. Charter Way
<br /> Stockton, CA
<br /> MTBE MTBEDepth to GW SPH DO
<br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness Reading
<br /> Well
<br /> /L u /L u /L u /L u /L u /L u /L u /L MSL ft. MSL ft. m
<br /> MW-9 05/21/1998 58,000 NA 7,900 1,000 430 1,100 620 NA 9.99 19.67 -9.68 NA NA
<br /> MW-9 08/11/1998 12,000 NA 3,900 94 51 140 150 NA 9.99 19.63 -9.64 NA NA
<br /> MW-9 11/09/1998 12,000 NA 3,500 140 64 130 <25 NA 9.99 20.90 -10.91 NA NA
<br /> MW-9 02/17/1999 6,100 NA 2,700 24.8 <5.00 10.0 46.7 NA 9.99 20.53 -10.54 NA NA
<br /> MW-9 05/25/1999 11,000 NA 3,800 50 56 100 <250 NA 9.99 19.37 -9.38 NA NA
<br /> MW-9 08/18/1999 1,110 NA 496 <5.00 <5.00 <5.00 12.6 NA 9.99 20.13 -10.14 NA NA
<br /> MW-9 11/05/1999 6,320 NA 2,830 <50.0 <50.0 <50.0 138 NA 9.99 19.39 -9.40 NA NA
<br /> MW-9 02/22/2000 14,500 NA 5,410 285 141 316 <500 NA 9.99 19.86 -9.87 NA NA
<br /> MW-9 05/16/2000 12,200 NA 5,170 123 <100 295 <500 <2.00 9.99 19.33 -9.34 NA NA
<br /> MW-9 08/30/2000 3,770 413 1,470 <20.0 <20.0 <20.0 <100 <20.0 9.99 20.26 -10.27 NA NA
<br /> MW-9 11/21/2000 7,040 1,000 3,120 48.4 33.9 91.1 110 <10 9.99 21.10 -11.11 NA NA
<br /> MW-9 02/15/2001 12,100 766 4,090 187 102 314 <250 2.21 9.99 21.25 -11.26 NA NA
<br /> MW-9 05/17/2001 8,000 <400 2,500 430 84 340 NA <10 9.99 20.60 -10.61 NA NA
<br /> MW-9 08/16/2001 1,800 <200 700 6.3 3.6 6.0 NA <2.5 9.99 21.88 -11.89 NA NA
<br /> MW-9 12/06/2001 3,600 <250 1,400 26 15 44 NA <5.0 9.99 23.93 -13.94 NA NA
<br /> MW-9 02/14/2002 11,000 <600 4,400 84 65 190 NA <20 9.03 21.46 -12.43 NA NA
<br /> MW-9 05/31/2002 7,500 <250 1,700 180 52 190 NA <10 9.03 21.37 -12.34 NA NA
<br /> MW-9 08/23/2002 3,500 <300 1,000 7.9 7.4 13 NA <5.0 9.03 22.74 -13.71 NA NA
<br /> MW-9 09/27/2002 NA NA NA NA NA NA NA NA 9.03 23.07 -14.04 NA NA
<br /> MW-9 11/13/2002 4,300 <200 1,200 16 9.7 25 NA <5.0 9.03 23.60 -14.57 NA 0.8
<br /> MW-9 02/11/2003 7,900 <1,000 3,100 36 27 61 NA 3.5 9.03 22.54 -13.51 NA 1.5
<br /> MW-9 05/29/2003 5,700 <600 1,600 22 13 29 NA <10 9.03 22.25 -13.22 NA NA
<br /> MW-9 08/14/2003 9,200 520 c 1,900 <50 <50 <100 NA <50 9.03 23.43 -14.40 NA NA
<br /> MW-10 05/10/1991 NA NA NA NA NA NA NA NA 10.83 NA NA NA NA
<br /> MW-10 02/05/1992 NA NA NA NA NA NA NA NA 10.83 NA NA NA NA
<br /> MW-10 05/15/1992 7,100 NA 2,000 ND 34 230 NA NA 10.83 40.73 -29.89 NA NA
<br /> Page 17
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