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rr r� �r r� rr r■� rr� r■ �r rr rr r � r r rr rr r■� r ! i 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 TGC"(ft.) 0%) Obs) (-SI) (A) ( b} ---(Ppb) (ppb) (Ppb) (ppb) ( b) (ppb) MW-5 05/18/00 27.40 -15.17 0.00 <50.0 <2.00 <2.00 <2.00 <2.00 <2.00 <2.00 (cant) 08/04/00 27.61 -15.38 0.00 <50.0 1.2 <1.0 <1.0 4.1 1.7 -- 11/06/00 28.38 -16.15 0.00 <50 <1.0 <1.0 <1.0 <1.0 <0.5 <1.0 02115-16101 28.45 -16.22 0.00 130 2.30 2.1 0.77 5.2 4.4 4.4 05101-02101 27.79 -15.56 0.00 <50 1.2 1.1 <0.5 2.1 <2.0 <2.0 08106-07102 28.49 -16.26 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 <2.0 11/26/01 30.37 -18.14 0.00 <50 <1.0 <1.0 <1.0 <0.5 <1.0 2.6 11.63 02/25/02 29.68 -18.05 0.00 <50 <0.5 <0.5 <0.5 <0.5 5.3 4.9 05/07/02 29.71 -18.08 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 -- 08/12/02 31.25 -19.62 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 <0.5 11105-06102 32.92 -21.29 0.00 <50 10 0.61 <0.50 <0.50 5.9 8.9 02/04/03 32.35 -20.72 0.00 <50 <0.5 <0.5 <0.5 <0.5 6.6 4.4 05127-28103 32.09 -20.46 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 - 08/26/03 33.26 -21.63 0.00 <50 <0.5 <0.5 <0.5 <0.5 <2.0 -- 11/2412003' - 11/2412003' 34.32 -22.69 -- <50 <0.5 <0.5 <0.5 <0.5 2.2 1.7 02/16/04 33.54 -21.91 -- -- -- -- - -- -- - 05/11/04 33.09 -21.46 0.00 -- -- -- -- -- •- 08/16/04 34.53 -22.90 0.00 NS NS NS NS NS NS NS MW-6 12,05 04/24/97 35.68 31-62 -23.63 -- 3,400 666 28 57 50 <5.0 -- 09/30/97 36.66 -24.61 0.00 990 34.5 1.8 1.6 6.9 17.6 -- 12/30/97 36.06 -24.01 0.00 2,270 678 30.6 36.9 58 <100.0 -- 04/22/98 31.72 -19.67 0.00 404 82.0 <0.5 2.6 1.2 <5.0 -- 05/18/00 27.04 -14.99 0.00 851 82.0 3.96 6.22 8.22 <2.00 <2.00 08/16/00 27.61 -15.56 0.00 160 35 26 4.6 33.00 <1.0 <1.0 11/06/00 -- -- -- NS NS NS NS NS NS NS 02/15-16/01 28.31 -16.26 0.00 380 100 2.6 2.8 3.2 19 19 05101-02101 27.67 -15.62 0.00 580 240 12 6.5 19 18 18 06940-325 5 of 12 ENSR Corporation