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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION#171, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTU TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED I TT-H-g I BENZENE TOLUENE Ethyllte—e XYLENE MTBE GROUNDWATER PAODUC I' TtIICT�N>E$$ ELEVATION IWATT0N (ug/L) (ug/L (UFJ-) ( ) (ug/L) (lig) (feet) {feet) (fit) (feet) ( ) MONITORING WELL#MW--2 02/25/99 <50 <0 3 066 <03 082 <20 3970 NP 000 05/14/99 - - DRY - 08/18/99 <50 <0 3 <0 3 <0 3 <05 <20 3932 NP 000 11/16/99 590 070 <0 3 1 <05 890 41 54 NP 000 02/09/00 410 <03 034 <0 3 <05 590 42 19 NP 000 05/17/00 <50 <0 25 04 <025 <05 397 4180 NP 000 08/23/00 485 <0 3 <0 2 <0 2 <04 698 4080 NP 000 11/15/00 61 <0 3 <0 2 <0 2 <04 132 43 30 NP 000 02/14/01 <50 <03 <02 <02 <04 141 4076 NP 000 05/15/01 137 <03 <02 <02 <04 213 4073 NP 000 08/15/01 110 <03 <02 <02 <04 165 4175 NP 000 11/06/01 199 12 16 <02 76 153 4990 NP 000 02/13/02 9 830 1 560 74 455 1,480 279 4405 NP 000 05/07/02 1 420 79 <02 <02 <04 366 4242 NP 000 08/07/02 <50 <0 08 <0 18 <0 17 <04 120 4745 NP 000 11/13/02 163 14 <0 18 <017 4 S J 134 4990 NP 000 02/19/03 <15 <0 22 <0 32 <0 31 <04 64 4988 NP 000 MONFrORING WELL# 3R 11/20/92 17 000 1 000 3 400 270 5 200 03/31/93 44 000 2,000 3 700 2,400 10 000 71 00 NP 000 9329 2229 06!23193 36 000 1,400 5 900 1 500 6 100 68 15 NP 000 9329 2514 09/13/93 61 000 3 800 11,000 2 400 9,100 71 05 NP 000 93 29 2224 12/13/93 570 71 55 97 28 7155 NP 000 93 29 2174 030/8/94 36 000 1 000 3 200 630 3 100 65 85 NP 000 93 29 2744 06/07/94 48 000 2200 5 400 1 500 6 800 6342 NP 000 93 29 2987 09/07/94 37 000 2 800 2,600 670 3 300 66 72 NP 000 93 29 2657 06/06/95 4 400 59 76 10 33 - - - 11/13/95 2 500 64 16 4 7 15 6028 NP 000 93 29 3301 02/13/96 320 70 ND 075 11 6031 NP 000 93 29 3298 05/14/96 390 10 092 060 0 76 5053 NP 000 9329 4276 08/28/96 220 3 1 032 041 <05 *<20 5405 NP 000 93 29 3924 11f14f96 <50 <0 3 <0 3 <0 3 <0 5 *<20 53 14 NP 000 93 29 40 15 171 TABS XL5 Page I of 10 3/20/03