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Table 1 Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California We11ID/ Date DTW GWE TPH(G) B T E X °2 MTBE j TOCO (ft 1 (ft) b) (ppb) (ppb) (Ppb) (Ppb) I (ppb) it MW-6 07/21/98 28 17 -1674 <50 <0 50 070 <0 50 070 <5 0/<2 0° (Cont) 10/14/98 29 13 -1770 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 01125-26/99 2822 -1679 <50 <0 50 <0 50 <0 50 <0 50 ; <2 5/<2 06 04/19-20/99 2592 -1449 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 MW-7 04/16/92 - - NOT SAMPLED - -- - 07/30/92 -- 950 320 19 57 25 - 10/21-22192 - -- 240 35 26 19 32 -- 01/13/93 -- -- 2,400 1,000 95 35 120 -- 11 82 04/26/93 5108 -3926 500 170 <2 5 <2 5 10 -- 07/26/93 52 11 -4029 3,800 1,200 59 92 140 - 10/20/93 5263 -4081 3,500 690 34 44 53 - 01/17-18194 50 10 -3828 15,000 4,800 460 290 620 - 04/25-26194 4798 -36 16 8,300 3,700 <25 400 130 „ -- 07/25-26194 5046 -3864 9,300 3,300 54 420 120 10126-27/94 51 63 -3981 3 700 1,900 11 240 <10 - 01/25-26/95 48 85 -3703 250 29 1 0 1 8 2 1 11 -- 04/26-27/95 4433 -32 51 97 24 074 <05 067 I -- 07/26/95 45 38 -33 56 330 l7 6 1 2 3 62 - 10125-26/95 4624 -3442 - -- 01/25/96 4329 -31 47 76 t 8 <05 <05 055 -- 04/25/96 38 64 -26 82 -- -- - - - 07/24/96 3904 -2722 <50 <05 <0 5 <0 5 <0 5 86 10/23/96 4084 -2902 SAMPLED SEMI-ANNUALLY - -- -- I - 01/20/97 37 14 -25 32 <50 059 <0 5 <05 <05 20 07/16/97 3471 -2289 <50 <05 <05 <05 <05 40 10/15/97 3654 -24 72 <50 <05 <0 5 <05 46 f 46/636 12/08/97 3637 -24 55 -- 03/05/98 31 98 -20 16 <50 <0 50 <0 50 <0 50 <0 50 140/1206 05/27/98 2870 -1688 <50 <0 50 <0 50 <0 50 <0 50 46/536 07/21/98 2875 -1693 <50 069 0 88 <0 50 0 73 21/226 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 „ 331336 01125-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 40/356 04119-20/99 2641 -1459 <50 13 <0 50 <0 50 <0 50 160/1206 ,I r 6981 x1sliff8 79 As of 99