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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID/ DATE DTW $I GWE TPH•G B T E X MTB9 TOC*(ff) Ur I _0 bgs) (ft) (ppb) (Ppb) CPPB) (Ppb) lPPb) (Ppb) MW-7 10/20/93 5263 49 0-69 0 -4081 3,500 690 34 44 53 - (cont) 01117-18194 solo -3828 15,000 4,800 460 290 620 -- 04125-26194 4798 -3616 8,300 3,700 <25 400 130 -- 07/25-26194 5046 -3864 9,300 3,300 54 420 120 -- � 10126-27194 5163 -3981 3,700 1,900 11 240 <10 -- 01125-26195 4885 -3703 250 29 10 1 8 21 -- 04/26-27195 4433 -3251 97 24 074 <0 5 067 -- 07/26/95 4538 -3356 330 17 61 23 6 2 -- 10125-26195 4624 -1442 -- -- -- -- --01/25/96 4329 -3147 76 1 8 <0 5 <0 5 055 -- 04/25/96 3864 -2682 - -- -- -- - 07124/96 3904 -2722 <50 <0 5 <0 5 <0 5 <0 5 86 10/23/96 4084 -29 02 SAMPLED SEMI-ANNUALLY -- -- J__ -- 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 03/05/98 3198 -2016 <50 <0 50 <0 50 <0 50 <0 50 140/120E 05/27/98 2870 -1688 <50 <0 50 <0 50 <0 50 <0 50 461536 07/21/98 2875 -1693 <50 069 088 <0 50 073 211226 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 33/336 01/25-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 40/356 04119-20199 2641 -1459 <50 13 <0 50 <0 50 <0 50 1601120" 07115-16199 2780 -1598 <50 <0 50 <0 50 <0 50 066 260/3206 11 82 10/25-26199 2948 -1766 <50 38 084 <0 50 2 3' 240/2506 01127-28100 2893 -1711 <50 42 073 <0 50 20 220/2106 06/26-27100 2623 -1441 <50 0 215 1 12 <0 500 1 52 131/1096 11 82 09122-23100 2877 -1695 <50 45 <0 50 <0 50 12 130/1106 12126-27100 2864 -1682 <50 Q 224 <0 500 <0 500 <0 500 952/733 6 03107-08/01 2835 -1653 <50 0 0 659 <0 500 <0 500 <0 500 549/5856 06126-27101 2936 -1754 <50 15 <0 50 <0 50 <0 50 130/1406 i 6981 x0138 . !06107102