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Table 1 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IW DATE DTW S1 GWE TPH(G) B T E X MTBE TOC' (f1=b'83) (04 WbP (Pph) Wb) C� $) (pp b) (ppb) I MW-6 04119-20/99 2592 49 0-69 0 -1449 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 (cont) 07/15-16199 2720 -1577 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 1143 10125-26199 2883 -1740 <50 <0 50 <0 50 <0 50 074 <2 5127' 01/27-28/00 2835 -1692 <50 <0 50 065 <0 50 16 <2 5/<2 06 06126.27/00 25.64 -1421 <50 0 <0 500 0 671 <0.500 0 787 <5.001<2 006 1 -- 49 0-69 0 -- 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 1182 04/26/93 5108 -3926 500 170 <2 5 <2 5 to -- 07/26/93 5211 -4029 3,800 1,200 59 92 140 -- 10/20/93 5263 -4081 3,500 690 34 44 53 -- 01117-18194 5010 -3828 15,000 4,800 460 290 620 04/25-26/94 4798 -3616 8,300 3,700 <25 400 130 -- 07125-26/94 5046 -3864 9,300 3,300 54 420 120 -- 10/26-27194 5163 -3981 3,700 1,900 11 240 <10 -- 01/25-26/95 4885 -3703 250 29 10 18 21 -- 04126-27195 4433 -3251 97 24 074 <0 5 067 -- 07/26/95 4538 -3356 330 17 61 23 62 -- 10/25-26195 4624 -3442 -- -- -- -- -- -- 01/25/96 4329 -3147 76 18 <05 <0 5 1 055 -- ! 04/25/96 3864 -2682Ji -- -- -- -- -- -- 07/24/96 3904 -2722 <50 <0 5 <0 5 <0 5 <0 5 86 10/23/96 4084 -2902 SAMPLED SEMI-ANNUALLY -- -- -- -- 01/20/97 37 14 -2532 <50 059 <0 5 <0 5 <0 5 20 07/16/97 3471 -2289 <50 <0 5 <0 5 <0 5 <0 5 40 10/15/97 3654 -2472 <50 <0 5 <0 5 <0 5 46' 46/636 12/08/97 3637 -2455 - -- -- -- __a ._ 03/05/98 3198 -2016 <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 <50 069 088 <0 50 073 211226 10/14/98 2974 -17 926 <0 50 <0 50 <0 50 <0 50 *1336 6981 xis/#I� gAs100` I