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<br /> WELL CONCENTRATIONS
<br /> Former Texaco Service Station
<br /> 440 W. Charter Way
<br /> Stockton, CA
<br /> MTBE MTBE Depth to GW SPH
<br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness
<br /> u IL u IL u /L (ug/L u L u IL uIL u IL MSL #k. MSL ft.
<br /> MW-10 11/18/1997 1,100 NA 2,000 2.9 1.4 6.7 <30 NA 10.83 26.97 -16.14 NA
<br /> I MW-10 02/09/1998 9,100 NA 3,900 24 11 66 100 NA 10.83 24.79 -13.96 NA
<br /> MW-10 05/21/1998 9,900 NA 2,100 11 <10 48 180 NA 10.83 20.51 -9.68 NA
<br /> MW-10 08/11/1998 3,400 NA 880 15 6.0 21 59 NA 10.83 20.60 -9.77 NA
<br /> MW-10 11/09/1998 4,400 NA 1,100 1 <2.5 3.5 21 49 1 NA 10.83 21.79 -10.96 NA
<br /> MW-10 02/17/1999 <50.0 NA 1.32 <0.500 <0.500 <0.500 <2.00 NA 10.83 21.83 -11.00 NA
<br /> MW-10 05/25/1999 <50 NA <0.50 <0.50 <0.50 <0.50 <2.5 NA 10.83 20.36 -9.53 NA
<br /> MW-10 08/18/1999 4,120 NA 446 48.9 <5.00 7.99 208 NA 10.83 20.21 -9.38 NA
<br /> MW-10 11/05/1999 3,300 NA 823 <10.0 <10.0 14.5 107 NA 1 10.83 22.32 -11.49 NA
<br /> IIS MW-10 02/22/2000 2,770 NA 1,040 15.7 <10.0 33.0 <100 NA 10.83 20.13 -9.30 NA
<br /> MW-10 05/16/2000 2,410a NA 440a 10.2a <5.00a 8.01a 92.581 <2.00 10.83 20.03 -9.20 NA
<br /> MW-10 08/30/2000 786 76.3 67.1 1.92 <0.500 0.703 48.1 <2.00 10.83 21.30 -10.47 NA
<br /> MW-10 1 11/21/2000 1 1,880 1 60.4 729 <10.0 I <10.0 <10.0 1 79.4 1 <10 10.83 1 22.05 1 -11.22 1 NA
<br /> MW-10 02/15/2001 1,090 61.8 239 2.84 <2.50 1.11 22.5 <2.00 1 10.83 22.09 -11.26 NA
<br /> MW-10 05/17/2001 720 <50 55 <0.50 <0.50 1.1 NA <0.!L_L 10.83 22.71 -11.88 NA
<br /> MW-11 05/10/1991 NA NA NA NA NA NA NA NA 10.17 39.46 -29.29 NA
<br /> MW-11 02/05/1992 130,000 NA 8,500 10,000 2,100 5,900 NA NA 10.17 40.89 -30.72 NA
<br /> MW-11 05/15/1992 42,000 NA 8,000 8,400 1,600 4,900 NA NA 10.17 40.18 -30.01 NA
<br /> MW-11 10/15/1992 NA NA NA NA NA NA NA NA 10.17 42.81 -32.64 NA
<br /> MW-11 12/17/1992 240,000 NA 45,000 25,000 5,100 11,000 NA NA 10.17 1 42.65 -32.48 NA
<br /> li MW-11 03/18/1993 150,000 NA 13,000 12,000 2,400 7,000 NA NA 10.17 1 40.17 -30.00 NA
<br /> MW-11 06/10/1993 69,000 NA 5,900 3,400 780 2,400 NA NA 10.17 38.57 -28.40 NA
<br /> MW-11 09/20/1993 120,000 NA 12,000 13,000 2,000 6,300 NA NA 10.17 NA NA NA
<br /> MW-11 10/22/1993 NA NA NA NA NA NA NA NA 10.17 39.65 1 -29.48 1 NA
<br /> MWA 1 12/22/1993 NA NA NA NA NA NA NA NA 10.17 39.40 -29.23 NA
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