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• � i Table 6 Joint Groundwater Monitoring Data and Analytical Results Former Vintage Car Wash 601 East Miner Avenue Stockton, California Product MTBE MTBE WELL IDI DATE DTW S.I. GWE Thickness TPHg B T E X by 8021 by 8260 TOC-(ft.) Of) ffihbgs) (-I) (A) (ppb) (ppb) (ppb) (ppb) b) (ppb) {p bJ MW-3 03/22/93 53.13 50-75 -41.61 0.26 - - -- -- -- - 11.52 06/18/93 51.29 -39.77 Sheen 43,000 2,200 11,000 1,300 7,500 NA - 12/17/93 51.46 -39.94 Sheen 13,000 610 820 <0.5 2,500 NA -- 04/13/94 49.82 -38.30 Sheen - - - -- -- -- - 04/24/97 -- - - -- -- - -- - - 09/30/97 35.00 -23.48 - -- - - -- -- - 12/30/97 344.36 -22.84 - - - - - - -- -- 04/22/98 -- - -- -- - - -- - - - 05/18/00 25.83 -14.31 0.00 758 <2.00 <2.00 4.80 11.4 <2.00 <2.00 08/04/00 26.20 -14.68 0.00 1,900 4.4 1.7 11 26.1 1.8 2.3 11/06/00 27.15 -15.63 0.00 360 <1.0 <1.0 <1.0 <1.0 2.7 2.7 02/15-16101 27.03 -15.51 0.00 890 3.5 10 1.7 5.3 <2.0 <2.0 05/01-02101 26.44 -14.92 0.00 3,200 3.6 22 12 27 <2.0 <2.0 08/06-07/02 27.16 50-75 -15.64 0.00 3,100 5.9 27 4.4 10 <2.0 <2.0 11/26/01 28.51 -16.99 0.00 5,100 1.9 2 1.1 21 <1.0 <0.5 10.88 02/25/02 28.09 -17.21 0.00 12,000 18 74 32 120 <2.0 -- 05/07/02 28.15 -17.27 0.00 1,700 2.3 13 6.3 13 <2.0 - 08/12/02 29.57 -18.69 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 <0.5 11/05-06/02 31.08 -20.20 0.00 13,000 17 55 16 52 <20 0.81 02/04/03 30.61 -19.73 0.00 3,800 4.4 39 3.8 4.5 <2.0 <0.50 05/27-28103 30.40 -19.52 0.00 6,600 22 <0.50 8.6 12 <2.0 - 08/22/03 31.65 -20.77 0.00 4,900 5.9 230 43 170 <2.0 - 11/24/20031 32.50 -21.62 -- 3,700 0.99 27 13 19 <2.0 <1.0 02/16/04 31.78 -20.90 -- -- -- - - -- -- - 05/11/04 31.42 -20.54 0.00 15,000 26 <20 36 52 <100 - 08/16/04 32.97 -22.09 0.00 NS NS NS NS NS NS NS 11/16/04 33.44 -22.56 0.00 15,000 <50 <50 <50 <100 <50 02/14/05 32.45 -21,57 0.00 NS NS NS NS NS NS NS 06940-325 3 of 12 ENSR Corporation k