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i TAN 1 GROUNDWATER DATA THRIKI'Y OIL STATION#172, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROIINDWAT SAMPLED TPH BENZENE TOLUENE EthylBmene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ugllr) (ug)L,) (ug;IL) (AWL) (UWL) (U910 {feed (ftd) (fit} (feet) (feet) Miamion wall-Mw 1x 08/14/96 <20 000 33 000 46,000 6 300 32 000 *370,000 4440 NP 000 13 18 31 22 11/26/96 16 000 5,200 26,500 64 900 *880 43 77 NP 000 13 18 -3059 02/25/97 1 700 11 000 14 000 1 300 7 100 *52 000 4040 NP 000 13 18 -2722 05/28/97 63,000 13000 16,000 250 8,000 *<2 500 43 80 NP 000 13 18 -3062 08/19/97 86 000 20 000 26 000 2 300 14 000 16W 41 65 NP 000 13 18 2847 11/26/97 63 000 22 000 24 000 <150 11,000 2 300 4065 NP 000 13 18 2747 02/18/98 130,000 20,000 15 000 <60 13 000 3 500 39 10 NP 000 13 18 2592 05/27/98 54 000 13 000 6 000 75 9 900 2 300 4060 NP 000 13 18 2742 08/26/98 28 000 4 500 900 <03 3 500 2 100 3630 NP 000 13 18 23 12 t 1124/98 23 000 5,400 l 100 <6 4 400 <20 3460 NP 000 13 18 2142 02/18/99 22 000 5 000 1 200 <6 5200 1,900 3210 NP 000 13 18 1892 05/20/99 34 000 6 000 1 300 <30 6,000 1 700 3255 NP 000 13 18 1937 08/18/99 140 000 28,000 32 000 1 500 17 000 1 100 35 63 NP 000 13 18 -2245 11110/99 28,000 4 700 4300 <60 2 900 1 200 37 16 NP 000 13 18 -2398 02/23/00 5 000 1 440 1 240 <12 1 420 *1 280/1 110 38 69 NP 000 13 18 -2551 05/10/00 2,140 1 9 <0 25 <0 25 1 9 1 350 3065 NP 000 13 18 -1747 08/18/00 <50 <5 <5 <5 <5 1,460 3483 NP 000 13 18 -21 65 11109/00 <50 <0 18 <0 14 <0 18 <0 26 772 35 62 NP 000 13 18 -2244 02/15/01 <50 <03 <0 2 <02 <04 976 31 82 NP 000 13 18 A8 64 05/17/01 SAMPLE BROKEN 38 69 NP 000 13 18 25 51 05/24/01 239 000 55 800 73 600 10,000 58 600 2 900 - 13 18 - MONITORING WELL fl VW-1 02/18/99 570 <03 <0 3 <0 3 1 8 430 31 40 NP 000 05/20/99 - - - - 08/18199 - DRY 11/10/99 02/23/00 DRY 05/10100 DRY 08118/00 DRY 11/09/00 02/15/01 05/17/01 172TAB1 XLS Page 8 of 10 6/20/01