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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION #171, STOCKTON, CA .HATE ANALYTICAL PARAMETERS D lvrl1 TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENE EthYl$entene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVA'nON ELEVATJON (40 (ugll.,) (aglL) (ug/L) (ug/L) (ug/I-) (fed) (feet (feet) {fejt) (feet) 06/08/95 58,000 9 900 9,500 140 7 500 - - - - 08/16/95 110 000 18,000 22,000 1 100 13 000 6097 NP 000 9459 33 61 11/13/95 5,600 1,400 1,100 150 870 6096 NP 000 9458 3362 02/13/96 ND ND ND ND ND 6098 NP 000 9458 3360 05/14/96 170 37 096 065 13 5138 NP 000 9458 4320 08/28/96 550 34 71 16 79 *45 5460 NP 000 9458 3998 11/14/96 <50 <03 <0 3 <0 3 078 *<20 53 30 NP 000 9458 4128 02/12/97 SAMPLES LOST 4990 NP 000 9458 4468 05/14/97 <50 <03 <0 3 <03 <05 *<20 5565 NP 000 9458 3893 08/13/97 <50 <03 <03 <0 3 <05 <20 - - - - 11/13/97 - - - - - - - - - - 02/11/98 <50 <03 <03 <03 <05 <20 49 10 NP 000 9458 4548 05/28/98 <50 <03 <0 3 <0 3 <05 <20 5380 NP 000 9458 4078 08/12/98 <50 <0 3 <03 <03 <05 <20 4170 NP 000 9458 5288 11/10/98 <50 <03 <0 3 <0 3 <05 <20 54 10 NP 000 9458 4048 02/25/99 72 13 <0 3 17 51 <20 3975 NP 000 1647 -2328 05/14/99 <50 <0 3 <03 <0 3 16 <20 48 16 NP 000 1647 -31 69 08/18/99 <50 <0 3 <03 <0 3 <05 <20 4036 NP 000 1647 -2389 11/16/99 520 42 2 8 22 92 <20 4251 NP 000 1647 -260 I 02/09/00 <50 <0 3 <03 <0 3 <05 <20 43 56 NP 000 1647 -2709 05/17/00 <50 <025 <0 25 <0 25 05 <05 4509 NP 000 1647 -2862 08/23/00 833 18 11 <02 <04 <06 4178 NP 000 1647 -25 31 11/15/00 <50 <0 3 <02 <02 <04 15 48 12 NP 000 1647 -31 65 02/14/01 <50 <03 <02 <02 <04 <06 41 80 NP 000 1647 -25 33 05/15/01 <50 <03 <02 <02 <04 11 4180 NP 000 1647 -25 33 MONITONNG WELL gra-1 06/08/95 15,000 3 600 <25 <25 550 - - - - 11/13/95 16 000 4 800 57 340 140 5996 NP 000 93 34 3348 02/13/96 130 2 7 ND ND ND 5988 NP 000 93 34 3346 05/14/96 15,000 5 500 48 38 590 5025 NP 000 93 34 4309 171 TAB I XLS Page 5 of 9 616101