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TAIN 1 GROUNDWATER DATA THRIFTY OIL STATION#172, STOCKTON, CA DATE ANALYTICAL PARAMETERS D1 PTft TO DEPTH TO PRODUCT T CASING GRtOUNDWATEI SAMPLED TPH BENZENE TOLUENE EthylBenzene XYLENE MIKE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ug,L) (u81L) (uo-) (u91L) ft L) (ugtL) (feet) (feet) (feet) (feet) (feet} monitonn Nell-Alw 10 08/14/96 <400 2,800 <6 <6 220 *12 000 4360 NP 000 1248 -3112 11/26/96 <50 <03 <0 3 <0 3 <0 5 *46 4226 NP 000 1248 2978 02/25/97 150 1 600 230 210 890 *4,800 3930 NP 000 1248 2682 05/28/97 720 11 21 06 <0 5 *220 4540 NP 000 1248 -3292 08/19/97 6 800 1 500 27 150 480 180 4105 NP 000 1248 28 57 11/26/97 550 26 061 18 48 160 3820 NP 000 1248 -25 72 02/18/98 450 28 048 046 19 200 35 15 NP 000 1248 -2267 05/27/98 150 066 066 <0 3 062 170 3970 NP 000 1248 -2722 08!26198 80 07 <03 <0 3 <05 75 3240 NP 000 1248 -1992 11/24198 770 20 <03 055 20 49 3390 NP 000 1248 -2142 02/18/99 200 <03 <03 <0 3 <0 5 380 3140 NP 000 1248 -1892 05/20/99 100 <03 <03 <0 3 <05 <20 2975 NP 000 1248 -1727 08/18/99 <50 <03 <03 <0 3 <05 <20 3434 NP 000 1248 -21 86 11/10/99 <50 <0 3 <03 <0 3 <0 5 <20 35 88 NP 000 1248 2340 02/23/00 <50 <0 25 <0 25 <0 25 <05 *<51 <5 3895 NP 000 1248 2647 05/10/00 <50 <0 25 <0 25 <0 25 <0 5 <5 2993 NP 000 1248 1745 08/18/00 <50 <5 <5 <5 <5 <5 34 14 NP 000 1248 2166 11/09/00 <50 <0 18 <0 14 <0 18 <0 26 <0 24 3435 NP 000 1248 2187 02/15/01 <50 <03 <02 <02 <04 <06 3085 NP 000 1248 1837 05/17/01 691 5 8 <02 <0 2 <04 655 3435 NP 000 1248 -21 87 08/16/01 26 500 3 380 2,060 1 520 5 340 294 35 88 NP 000 1248 -2340 11/08/01 23,900 11 300 1 700 81 581 1 760 3664 NP 000 1248 -2416 02/21/02 20 900 2080 912 796 2 840 163 33 55 NP 000 1248 -21 07 05/22/02 19 500 2,250 649 252 2 600 109 3091 NP 000 1248 -1843 08/14/02 153 <0 08 <0 18 <017 <04 76 31 28 NP 000 1248 -1880 11/20/02 1 950 141 29 291 312 36 32 81 NP 000 1248 -2033 Monttortn Well- - .1 08/14/96 <20 000 33,000 46 000 6 300 32 000 *370 000 4440 NP 000 13 18 31 22 11/26/96 16,000 5,200 26,500 64 900 *880 4377 NP 000 13 18 30 59 02/25/97 1 700 11,000 14,000 1,300 7 100 *52 000 4040 NP 000 13 18 -2722 05/28/97 63 000 13 000 16 000 250 8,000 *<2 500 4380 NP 000 13 18 -3062 08/19/97 86 000 20 000 26 000 2 300 14 000 1 600 41 65 NP 000 13 18 2847 11/26/97 63 000 22 000 24 000 <150 110W 2 300 4065 NP 000 13 18 -2747 02!18198 130,000 20,000 15,000 <60 130M 3 500 39 10 NP 000 13 18 2592 172TABI XL5 Page 8 of 12 12/3/02