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} WELL CONCENTRATIONS , Shell-branded Service Station 2375 West Grant Line Road =, Tracy, CA MTBEDepth to GW Well ID Date TPPH B T E X 8260 DIPS ETBE TAME TBA Ethanol TOC Water Elevation u IL u /L u /L u IL u /L u IL) (u IL /L(u IL) {u IL) u u IL MSL ft. MSL MW-1 2/26/2003 NA NA NA NA NA NA NA NA NA NA NA NA 12.72 NA MW-1. 3/7/2003 <200 <2.0 <2.0 <2.0 <2.0 730 <2.0 <2.0 2.0 <50 NA NA 12.66 NA MW-1 4/9/2003 <50 <0.50 <0.50 <0.50 <0.50 260 <2.0 <2.0 <2.0 <50 NA 24.53 11.75 12.78 MW-1 7/30/2003 <1;000 <10 <10 <10 <20 2,300 <40 <40 <.40 <100 NA 24.53 13.00 11.53 MW-1 10/27/2003 <1,000 <10 I <10 <10 <20 1 2,900 <40 <40 <40 <100 NA 24.53 13.11 11.42 MW-1, 1/26/2004 <1,000 <10 <10 <10 <20 820 <40 <40 <40 <100 NA 24.53 12.69 11.84 MW-1 4/26/2004 <1,000 <10 <10 <10 <20 2,800 <40 . <40 <40 <100 NA 24.53 12.87 11.66 MW-1 713012004. <1,000 <10. <10 .<10. <20 2,600 <40 <40 <40 <100 <1,000 24.53 12.62 11.91 MW-1 10/28/2004 <500 <5.0 <5.0 <5.0 <10 . 730 <20 <20 <20 <50 NA 24.53 12.75 i 11.78 MW-1 1/24/2005 <2,500 <25 <25 <25 <50 2,700 <100 <100 <100 <250 NA 24.53 12.67 11.86 MW-1 4/29/2005 <50 <0.50 <0.50 <0.50 <1.0 770 c <2.0 <2.0 2.1 <5.0 NA 26.65 12.51 14.14 MW-1 7/28/2005 <50 <0.50 <0.50 <0.50• <1.0 150 <2.0 <2.0 <2.0 <5.0 <50 - 26.65 10.42 16.23 MW-1 10/28/2005 <500 <5.0 . <5.0 <5.0 <10 1,300 <20 <20 <20 75 NA 26.65 12.70 .13.95 MW-1 1/30/2006 340 <1.0 <1.0 <1.0 <2.0 250 <4.0 <4.0 <4.0 <10 NA 26.65 12.59 14.06 MW-1 3/9/2006 130 a <0.50 <1.0 <1.0 <1.0 290 <2.0 <2.0 0.46 a <10 <100 26.65 12.70 13.95 MW-1 4/26/2006 140 f . <0.50 <1.0 <1.0 <1.0 200 <2.0 <2.0 0.46 g <10 NA 26.65 12.54 14.11 MW-1 5/22/2006 450 h <2.5 h <2.5 h <2.5 h <5.0 h 260 h <10.h <10.h <10 h. <25.h NA 26.65 12.28 14.37 MW-1 6/26/2006 430 <0.50 <0.50 <0.50 <1.0 280 <2.0 <2.0 <2.0 <5.0 NA 26.65 12.60' 14.05 MW-1 7/19/2006 460 <0.50 <0.50 <0.50 <1.0 230 i <2.0 <2.0 <2.0 <5.0 <50 26.65 12.53 14.12 MW-1 8/23/2006 810 <1.0 <1.0 <1.0 <2.0 400 <4.0 <4.0 <4.0 10 NA 26.65 12.48 14.17 MW-1 9/20/2006 430 <0.50 <0.50 <0.50 <1'.0 500 i <2.0 <2.0 <2.0 <5.0 NA 26.65 12.92 13.73 MW-1 10/25/2006 320 <2.5 <2.5 <2.5 <5.0 410 <10 <10 <10 <25 NA 26.65 12.66 13.99 MW-1 11/28/2006 410 <2.5 <2.5 <2.5 <5.0 230 <10 <10 <10 <25 NA 26.65 12.71 13.94 MW-1 12/14/2006 230 <0.50 <0.50 <0.50 <1.0 320 <2.0 <2.0 <2.0 160 NA 26.65 12.71 13.94 MW 1 1/22/2007 380 <2.5 <2.5 <2.5 <5.0 240 <10 <10 <10 <25 NA 26.65 12.98 13.67 MW-1 2/23/2007 250 <2.5 <5.0 <2.5 <5.0 200 <10 <10 <10 100 NA 26.65 12.51 14.14 Page 1