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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION#171, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO REPTUTO PRODUCT CASING GROUNDWATER SAMPLED TPH-g I BENZENE TOLUENE Et1ly1BenzeRe XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION M VXlrJON (ug/l-) (uglL) (ug1L) (VA) (ugtL) (ug,) tf"0 (deet) (tice0 (feet) (feet) 02/12/97 SAMPLES LOST 47 80 NP 000 93 29 4549 05/14/97 <50 <0 3 044 <0 3 <05 *42 51 92 NP 000 93 29 41 37 08/13/97 <50 <03 <03 <0 3 <0 5 <20 - - - 11/13/97 3 400 790 30 <15 13 <20 50 80 NP 000 93 29 4249 02/11/98 9 300 920 2000 L40 900 2000 4920 NP 000 93 29 4509 05/28/98 2 500 <03 1 <0 3 <03 <05 5 100 4960 NP 000 93 29 4369 08/12/98 1 600 <03 <03 <03 <05 1 400 3990 NP 000 93 29 5339 11/10/98 610 <03 <03 <03 <05 2 100 4650 NP 000 93 29 4679 02/25/99 <50 <0 3 <0 3 <03 <05 <20 37 85 NP 000 1463 -2322 05/14/99 850 <03 <03 <03 <05 1200 4473 NP 000 1463 -3010 08/18/99 620 <03 1 <03 <0 3 <05 940 3842 NP 000 1463 -2379 11/16/99 <50 <0 3 <03 <0 3 <05 <20 4054 NP 000 1463 -2591 02/09/00 <50 <0 3 <0 3 <0 3 <0 5 <20 39 88 NP 000 1463 -2525 05/17/00 <50 <0 25 04 <0 25 07 <05 4448 NP 000 1463 -2985 08/23/00 73 <03 <02 <02 <04 25 39 82 NP 000 1463 25 19 11/15/00 <50 <03 <02 <02 <04 <06 4294 NP 000 1463 2831 02/14/01 <50 <03 <02 <02 <04 <06 4061 NP 000 1463 2598 05/15/01 <50 <03 <02 <02 <04 37 4061 NP 000 1463 2598 MONITORING WELL#MW-5 11/20/92 - - - - - - - - 03/31/93 25 000 2 700 - - - 6889 NP 000 93 36 2447 06/23/93 2,800 100 4 600 430 6 300 68 25 NP 000 93 36 25 It 09/13/93 - - 110 53 270 71 73 NP 000 93 36 2163 12/13/93 72 10 SHEEN 000 93 36 2126 03/08/94 - 6543 SHEEN 000 93 36 2793 06/07/94 6305 SHEEN 000 93 36 30 31 09/07/94 6624 SHEEN 000 93 36 27 12 08/16/95 5908 SHEEN 000 93 36 3428 11/13/95 59 000 5 100 13000 1 500 11 000 5908 NP 000 93 36 3428 02/13/96 20 000 3 200 3 300 340 1 800 59 11 NP 000 93 36 3425 171 TAB 1 XLS Page 3 of 9 616101