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TAO I — GROUNDWATER DATA THRIFTY OIL STATION #171, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENE Ethyllienzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ugll-) (ug L) (40 (ug/ ) (feet) (feel) (feet) (feet) {feet) MONITORING WELL#TB-7 Screen Interval =25 to 7n5ffteet 06ro8195 1 1100W 11 000 17 000 640 16 000 08/16/95 83 000 15 000 9 500 1 250 13,000 6022 NP 000 93 68 3346 11/13/95 92 000 19 000 23 000 1 700 9 800 6023 NP 000 9368 3345 02/13196 9 000 2 500 12 22 140 6024 NP 000 93 68 3344 05/14/96 69 000 20 000 22 000 1 900 9,400 - 5072 NP 000 9368 4296 08/28/96 84,000 16 000 19,000 1,500 8 700 *1 500 53 80 NP 000 9368 39 88 11/14/96 6 100 53 1900 <6 1 000 *1 200 5262 NP 000 93 68 4l 06 02/12/97 SAMPLES LOST 48 80 NP 000 9368 4488 05/14/97 <50 090 <03 <03 <0 5 *39 53 07 NP 000 93 68 4061 08/13197 64 12 074 <03 11 31 11/13/97 92 000 10 000 27 000 2 800 15 000 470 51 70 NP 000 93 68 4l 98 02/11/98 65 000 7 400 17,000 l 100 6 900 670 4820 NP 000 93 68 4548 05/28/98 470 i 6 1 1 <03 24 460 50 55 NP 000 9368 43 13 08/12/98 190 <0 3 <03 <0 3 <05 390 4745 NP 000 93 68 46 23 11/10/98 110 <03 <0 3 <0 3 <0 5 260 52 75 NP 000 93 68 40 93 02!25!99 98 <0 3 <0 3 <0 3 <0 5 160 38 35 NP 000 15 11 23 24 05/14/99 4,000 <0 3 <03 <03 <0 5 7200 4038 NP 000 15 1 l 25 27 08/18/99 <50 <03 <0 3 <0 3 <0 5 <20 3906 NP 000 15 11 -2395 i 1116199 59,000 3 900 11 000 1 000 9 900 1 000 41 26 NP 000 15 11 2615 02109/00 25 000 2 300 5 400 <30 3 400 420 4076 NP 000 15 11 -2565 05/17/00 11 000 852 1,700 <6 1 400 415 41 90 NP 000 15 11 -2679 08/23/00 9 430 1 260 563 j <02 1 670 884 4055 NP 000 15 11 -2544 11/15/00 <50 <03 <02 <0 2 <04 150 41 89 NP 000 15 11 -2678 02/14/01 <50 <03 <02 <0 2 <0 4 149 4050 NP 000 15 11 -25 39 05/15/01 148 <0 3 <02 <02 <04 227 4050 NP 000 15 11 -25 39 08115/01 98 <03 <02 <0 2 <0 4 171 41 51 NP 000 15 11 2640 11/06/01 293 69 88 8 43 137 46 10 NP 000 15 11 -3099 02/13/02 30 800 1 160 719 1 060 6 380 71 4360 NP 000 15 11 2849 05/07/02 15 700 13 84 <20 5 760 77 42 15 NP 000 15 11 -2704 08107/02 <50 <0 08 <0 18 <0 17 <04 81 4730 NP 000 15 11 -32 19 11/13/02 155 <0 08 <0 18 <0 17 <04 44 4980 NP 000 15 11 -3469 02119/03 <15 <0 22 <0 32 <0 31 <04 <0 18 4979 NP 000 15 11 -3468 05/14/03 <15 <0 22 <0 32 <0 31 <04 <0 18 44 84 NP 000 15 11 29 73 1 171 TAB1 XLS Page 8 of 11 12/11/03 I