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TAN 1 GROUNDWATER DATA THRIFTY OIL STATION#172, STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATEN SAMPLED TPEI BENZENE TOLUENE EthytBeazene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ug/L) (Ugf ) (ug/L) (ug/L) (u91L,) (U91L) (feet) (feet) (feed (Feet) (feet) 11/24/92 1 400 720 69 ND 120 57 05 NP 000 1220 -4485 02/24/93 9,700 1 800 790 210 1 000 53 75 NP 000 1220 -4155 05/20/93 3500-0 8 000 7 400 290 6200 52 85 NP 000 12 20 -4065 09!09193 20 000 3200 1 000 400 2,300 54 83 NP 000 1220 42 63 11/30/93 8 000 1,400 270 150 610 5258 NP 000 1220 4038 02123194 6300-0 4 600 3 600 1 400 5 900 5833 NP 000 1220 4613 05/31/94 100 000 9200 11 000 3 00(1 13 000 4772 NP 000 1220 3552 08/15/94 62 000 4 500 5 200 1 000 6 700 5034 NP D 00 1220 -3814 11/08/94 570 26 43 94 35 51 12 NP 000 1220 3892 02/08/95 72 000 5 400 6 400 2 700 9 900 4829 NP 000 1220 -3609 05/09/95 - - - 4662 NP 000 1220 -3442 08/08/95 73 000 4 600 7 100 2 400 12000 - 4768 NP 000 12 20 -3548 02/29196 26 000 1 200 3 000 l 600 6 000 *200 5746 NP 000 1220 -45 26 05/29/96 11 000 580 570 510 2200 *75 5130 NP 000 1220 39 10 08/14/96 <1 000 1 200 830 1 500 4 700 -26000 43 50 NP 000 1220 31 30 11/26/96 <50 12 059 <03 <0 5 *61 42 12 NP 000 1220 -2992 02/25/97 23 170 27 280 580 *2 700 3920 NP 000 1220 2700 05/28/97 310 47 12 1 1 59 *59 3755 NP 000 1220 -2535 08/19/97 9 100 340 100 390 1 200 49 4080 NP 000 1220 -2860 11/26/97 110 1 9 <03 <03 <05 26 3900 NP 000 12 20 -2680 02/18/98 <50 <03 <0 3 <03 <05 46 34 38 NP 000 12 20 22 18 05/27198 130 3 7 32 24 17 27 4200 NP 000 1220 2980 08/26/98 <50 <03 <0 3 <03 <0 5 40 3140 NP 000 1220 1920 11/24/98 <50 <0 3 <03 <03 <05 27 33 80 NP 000 1220 -21 60 02/18/99 <50 <03 <0 3 <03 <05 <20 28 15 NP 000 1220 -15 95 05/20/99 <50 <03 <0 3 <03 <05 <20 3070 NP 000 1220 -1850 08/18/99 <50 <03 <0 3 <01 <0 5 <20 3437 NP 000 1220 22 17 11/10/99 <50 <0 3 <03 <03 <0 5 <20 3745 NP 000 1220 2525 02/23/00 <50 <0 25 <0 25 <0 25 <0 5 *<51 <5 3898 NP 000 1220 2678 05/10/00 <50 <0 25 <0 25 <0 25 <05 <5 3005 NP 000 1220 17 85 08/18/00 <50 <5 <5 <5 <5 <5 3390 NP 000 1220 -21 70 11/09/00 <50 <0 18 <014 <0 18 <D 26 <0 24 34 38 NP 000 1220 -22 18 02/15/01 <50 <03 <02 <02 <04 <06 3097 NP 000 1220 1877 05/17/01 <50 <03 <02 <02 <04 <06 3591 NP 000 1220 2371 08/16/01 <50 <03 <02 <02 <04 <06 3438 NP 000 1220 22 18 11/08101 <50 <03 <02 <02 <04 <06 35 00 NP 000 1220 -22 80 02/21/02 <50 <03 <02 <02 <04 5 3 31 92 NP 000 1220 1972 172TABI XLS Page 2 of 10 40110103