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s TIP • Groundwater Monitoring ata and Analytical Results Tosca (Unocal) Service Station#16981 4707 Pacific Avenue Stockton, California Well ID/ Date DTW GWE TPH(G) B T E X MTBE TOC* (/3') (1Y) (ppb) (PPO (Ppb) (ppb) Wb) (PPb) MW-6 01/20/97 36 68 -2525 <50 <0 5 <05 <05 <05 <50 (cont) 07116/97 3403 -2260 <50 <0 5 <05 <05 <05 <5 0 10/16/97 35 79 -2436 <50 <05 <0 5 <05 <05 <5 0/<2 06 12/08/97 35 65 -2422 -- -- -- -- -- - 03105/98 31 62 -20 19 <50 <0 50 <0 50 <0 50 <0 50 4 41<2 0 05/27/98 28 19 -1676 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/21/98 28 17 -16 74 <50 <0 50 070 <0 50 070 <5 01<2 06 10/14/98 29 13 -17 70 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 01125-26199 2822 -1679 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 04119-20199 25 92 -1449 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07115-16199 2720 -1577 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 11 43 10125-26199 2883 -1740 <50 <0 50 <0 50 <0 50 074 <2 51276 MW-7 04/16/92 -- NOT SAMPLED -- -- - -- - 07/30/92 - -- 950 320 19 57 25 - 10121-22192 - -- 240 35 26 1 9 32 - 01/13/93 - - 2,400 1,000 95 35 I20 - 11 82 04/26/93 51 08 -3926 500 170 <25 <2 5 10 -- 07/26/93 52 11 -4029 3,800 1,200 59 92 140 -- 10/20/93 52 63 -4081 3,500 690 34 44 53 -- 01/17-18/94 50 10 -3828 15,000 4,800 460 290 620 -- 04/25-26194 4798 -36 16 8,300 3,700 <25 400 130 -- 07/25-26/94 5046 -3864 9,300 3,300 54 420 120 -- 10/26-27194 51 63 -39 81 3,700 1,900 11 240 <10 -- 01/25-26/95 4885 -3703 250 29 10 1 8 2 1 -- 04126-27195 4433 -32 51 97 24 074 <0 5 067 -- 07/26/95 45 38 -33 56 330 17 6 1 23 62 -- 10/25-26195 4624 -3442 -- -- - -- -- 01/25/96 4329 -31 47 76 1 8 <0 5 <05 055 - 04/25/96 3864 -2682 - - -- -- - 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 <05 <0 5 20 07/16/97 3471 -2289 <50 <05 <05 <05 <05 40 10/15/97 36 54 -2472 <50 <05 <0 5 <05 46 461636 6981 als/##80138 7 As of 10/26/99