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TO 1 • x <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station{/6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> We111D/ bate DTW GWE TPH(G) B T E X MTBE <br /> (ft) (ppb) (ppb) (ppb) b) (ppb) (F b) <br /> MW-2 02/21/90 -- -- 12,000 1900 75 21 140 -- <br /> 10/18/90 DRY -- -- -- -- <br /> 11/19/90 DRY <br /> 12/27/90 DRY <br /> 01/28/91 DRY <br /> 04/02/91 DRY <br /> 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 /> 1156 04/26/93 5072 -39 16 43,000 8,000 <125 <125 <125 - <br /> 07/26/93 5172 -4016 18,000 2,900 47 38 90 -- <br /> 10/20/93 5226 -4070 12 000 2,400 52 <20 60 -- <br /> 01/17-18/94 4974 -38 18 14,000 1,800 31 29 120 -- <br /> 04/25-26/94 4761 -3605 21,000 8,000 240 93 220 -- <br /> 07/25-26194 5007 -3851 NOT SAMPLED-(CONSTRUCTION) <br /> 10/26-27/94 5125 -3969 24,000 11,000 3,100 96 3,200 -- <br /> 01/25-26195 4849 -3693 8,600 4,100 94 35 130 -- <br /> 04/26-27195 43 88 -3232 11,000 5,300 460 74 530 -- <br /> 07/27/95 4495 -33 39 3,300 640 26 <12 5 13 -- <br /> 10/25-26195 45 84 -34 28 <br /> 01/25/96 4305 -31 49 2,100 510 29 <10 11 -_3 <br /> 04/25/96 3822 -2666 <br /> 07/24/96 3860 -2704 1,300 470 110 16 75 36 <br /> 10/23/96 4043 -28 87 SAMPLED SEMI-ANNUALLY <br /> 01/21/97 3693 -25 37 250 72 13 4 5 16 18 <br /> 07117197 3424 -2268 16,000 3,900 220 180 390 <250 <br /> 10/16/97 3608 -2452 12,000 3,500 200 170 640 <500/1206 <br /> 12/08/97 36 14 -2458 <br /> 03/05/98 3268 -21 12 10,000 1,900 <50 150 180 280/3006 <br /> 05/27/98 2931 -1775 8,600 1,400 18 56 65 47/2706 <br /> 07/21/98 2831 -1675 490 85 5 6 29 24 220/1806 <br /> 10/14/98 2926 -1770 2,900 620 17 36 56 380/1906 <br /> 6981 xis/#180138 2 As of 10/14/98 <br />