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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION#171, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENE ElhylBenxene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (u�) (e8f1.) (ug/L) (ugfi) (ug/L) (ug1L) (Feet) (feet) (feet) {feet) (feet) MONITORING WELL#MW-2 ,Screen Interval 30 to 60 eel 02/25/99 <50 <0 3 066 <0 3 0 82 <20 39 70 NP 000 05/14/99 - - - DRY 08/18/99 <50 <0 3 <03 <0 3 <05 <20 3932 NP 000 11116/99 590 070 <03 1 <05 890 41 54 NP 000 02/09/00 1 410 <03 034 <0 3 <05 590 42 19 NP 000 05/17/00 <50 <0 25 04 <0 25 <05 397 41 80 NP 000 08!23!00 485 <0 3 <02 <0 2 <04 698 4080 NP 000 11/15/00 61 <03 <02 <0 2 <04 132 43 30 NP 000 02/14101 <50 <03 <0 2 <0 2 <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 41 75 NP 000 11/06/01 199 12 16 <02 7 6 153 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 <018 <017 <04 120 4745 NP 000 11/13102 163 14 <0 18 <017 481 134 4990 NP 000 02/19/03 <15 <0 22 <0 32 <0 31 <04 64 49 88 NP 000 05/14/03 110 <0 22 <0 32 <0 31 <04 59 45 25 NP 000 08/12103 97 <0 22 <0 32 <0 31 <04 48 4915 NP 000 I MONITORING WELL#MW-3R Screen Interval = 40 to 70feet 11/20/92 17 000 1 000 3 400 270 5200 03/31/93 44,000 2000 3 700 2 400 10 000 71 00 NP 000 9329 2229 06/23/93 36 000 1 400 5 900 1 500 6 100 68 15 NP 000 9329 25 14 09/13/93 61 000 3 800 11 000 2,400 9 100 7105 NP 000 9329 2224 12/13/93 570 71 55 97 28 7155 NP 000 9329 21 74 030/8/94 36 000 1,000 3 200 630 3,100 6585 NP 000 93 29 2744 06/07/94 48 000 2 200 5 400 1 500 6 800 6342 NP 000 9329 29 87 09/07/94 37 000 2 800 2 600 670 3 300 6672 NP 000 9329 2657 06/06195 4 400 59 76 € 0 3 3 - 11/13/95 2 500 64 16 47 15 6028 NP 000 93 29 3301 02/13/96 320 70 ND 075 11 60 31 NP o00---- 93 29 3298 05/14/96 390 10 092 060 076 5053 NP 000 9329 4276 171 TAB i XLS Page 1 of 11 10/20/03