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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 1 4707 Pacific Avenue Stockton,California 1 WELL ID/ DATE DTW sl GWE TPI -G B T E X MTBE TOC-(ft,) ON (ft bps} (ft,} (ppb) (lrb} (p b) ( b) (ppb) (ppb) MW-6 12/30-31/0218 3206 49 0-69 0 -2063 <50 <0 50 <D 50 <D 50 <1 0 <2 0 (cont) 03129-30/0319 31 16 -1973 <50 <0 50 071 <0 50 <1 0 <2 0 06125-26/03'" 31 48 -2005 <50 <0 50 <0 SO <0 50 <1 0 P <Z 0 I MW-7 04/16/92 - 49 0-69 0 -- -- -- -- -- -- -- 07/30/92 -- -- 950 320 19 57 251 - 10121-22/92 -- -- 240 35 26 1 9 3 2 -- 01/13/93 -- -- 2,400 1,000 95 35 120 -- 11 82 04/26/93 51 08 -3926 500 170 <2 5 4 5 10 1 - 07/26/93 52 11 -4029 3,800 1,200 59 92 140 -- 10/20/93 5263 -4091 3,500 690 34 44 531 -- 01/17-18194 5010 -3828 15,000 4,800 460 290 620 - 04/25-26194 4798 -36 16 8,300 3,700 X25 400 130 + -- 07125-26/94 5046 -3864 9,300 3,300 54 420 120 -- 10/26-27/94 51 63 -3981 3,700 1,900 11 240 <10 -- 01/25-26/95 4885 -3703 250 29 10 1 8 2 1 �C -- 04/26-27195 4433 -3251 97 24 074 <0 5 0 67 -- 07/26/95 45 38 -3356 330 17 61 23 62 -- 10125-26195 4624 -3442 -- -- -- -- 01/25/96 4329 -31 47 76 1 8 <0 5 <0 5 055 - 04/25/96 3964 -2682 -- -- -- -- --i -- 07124196 3904 -2722 <50 <0 5 <0 5 <0 5 <0 5 II 86 10/23/96 4084 -2902 SAMPLED SEMI-ANNUALLY -- - --I 01/20/97 37 14 -2532 <50 059 <0 5 <0 5 <0 51 ;' 20 07/16/97 3471 -2289 <50 <0 5 <0 5 <0 5 <0 5 y 40 10/15/97 3654 -2472 <50 <0 5 <0 5 <0 5 46 461636 12/08/97 3637 -2455 -- -- -- -- ii -- 03/05/98 31 98 -2016 <50 <0 50 <0 50 <0 50 <0 50 ij 140/1206 05/27/98 2870 -1688 <50 <0 50 <0 50 <0 50 <0 50 46/536 07/21/98 2875 -1693 <50 069 088 <0 50 0731 21/226 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 331336 II 01/25-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 401356 6981 x11038 i i T A�r { /2b/03 I I