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Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> WeR ID/ Date DTW GWE TPH(G) B T E X MTBE <br /> TWO (ft ) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (p b) <br /> I <br /> MW-5 04/02/91 DRY <br /> (cont) 07/18/91 DRY <br /> 09/30/91 DRY <br /> 11/14/91 DRY <br /> 04/16/92 DRY <br /> 07/30/92 DRY <br /> 10/21-22/92 DRY <br /> 01/13/93 DRY <br /> 1176 04/26/93 5082 -3906 60,000 28,000 <250 <250 <250 -- <br /> 07/26/93 51 81 -4005 43,000 19,000 240 <125 <125 -- <br /> 10/20/93 52 35 4059 21,000 15,000 120 <50 68 -- <br /> 01/17-18/94 4983 -3807 23,000 13,000 100 <50 75 -- <br /> 04/25-26/94 4775 -35 99 16,000 12,000 92 31 70 -- <br /> 07125-26194 50 16 -3840 NOT SAMPLED- (CONSTRUCTION) <br /> 10/26-27/94 51 26 -3950 13,000 10,000 790 <20 270 <br /> 01125-26195 4862 -3686 5,000 3,700 27 <05 44 <br /> 04126-27195 43 97 -3221 2,900 650 12 2 3 16 -- <br /> 07/27/95 4503 -3327 150 21 24 <1 0 1 9 <br /> 10125-26195 4992 -38 16 <br /> 01/25/96 43 11 -31 35 86 69 085 <05 084 - 3 <br /> 04/25/96 38 31 -2655 <br /> 07/24/96 38 68 -2692 <50 <05 <05 <05 <05 691696 <br /> 10/23/96 4053 -2877 SAMPLED SEMI-ANNUALLY <br /> 01/20/97 36 82 -2506 <50 <05 <05 <05 <05 25 <br /> 07/16/97 3432 -2256 <50 <0 5 <0 5 <05 <0 5 34 <br /> 10/15/97 36 18 -2442 <50 <05 <05 <0 5 <05 <5 0 <br /> 12/08/97 3605 -2429 -- -- <br /> 03/05/98 3166 -1990 <50 <0 50 <0 50 <0 50 <0 50 231186 <br /> 05/27/98 2828 -1652 <50 <0 50 <0 50 <0 50 <0 50 8 1/7 86 <br /> 07/21/98 2840 -1664 <50 <0 50 20 <0 50 2 1 5 0/4 56 <br /> 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 <0 50 6 012 96 <br /> 6981 xlsl#180138 5 As of 10/14/98 <br />