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i • TAB 1 GROUNDWATER DATA THRIFTY OIL STATION#172, STOCKTON, CA DATE ANALYTICAL PARAMETERS (DEPTH TO DEPTH TO PRODUCT CASING GROUNDWAfFA SAMPLKV TPH BENZENE FT40LVENF EthyllBennzen,e XYLENE M'I'ME GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ug/L) (ug/L.) (ug/L (ugQ (ug/L) (ug/L) (Teet) 04:et) (feet) (feet) {feec) 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 <0 3 <02 <0 2 <04 <0 6 3085 NP 000 1248 18 37 05/17/01 691 58 <02 -<02 <04 655 34 35 NP 000 1248 -21 87 08/16/01 26,500 3 380 2060 1 520 5 340 294 35 88 NP 000 1248 -2340 it/08/O1 23,900 11,300 1 700 81 581 1,760 3664 NP 000 1248 -24 16 02/21/02 20,900 2080 912 796 2 840 163 33 55 NP 000 1248 -2107 mar r-1�rrw- .1 08/14/96 <20 000 33 000 46 000 6 300 32 000 *370 000 44 40 NP 000 13 18 -31 22 11/26/96 16,000 5 200 26 500 64 900 *880 43 77 NP 000 13 18 3059 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 11 000 2 300 4065 NP 000 13 18 -2747 02/18/98 130 000 20 000 15 000 <60 13 000 3,500 39 10 NP 000 13 18 -2592 05/27/98 54,000 13 000 6,000 75 9 900 2 300 4060 NP 000 13 18 -2742 08/26/98 28,000 4,500 900 <0 3 3,500 2,100 3630 NP 000 13 18 -23 12 11/24/98 23 000 5 400 1 100 <6 4 400 <20 34 60 NP 000 13 18 21 42 02/18/99 22 000 5,000 1 200 <6 5,200 1,900 32 10 NP 000 13 18 -1892 05120/99 34,000 6,000 1,300 <30 6,000 1 700 3255 NP 000 13 18 -1937 08/18/99 140 000 28,000 32 000 1 500 17,000 1 100 3563 NP 000 13 18 -2245 11/10/99 28 000 4,700 4300 <60 2,900 1,200 37 16 NP 000 13 18 -2398 02/23/00 5,000 1 440 1,240 <12 1 420 *1,280/1 110 3869 NP 000 l3 18 -2551 05/10/00 2,140 1 9 <0 25 <0 25 1 9 1,350 3065 NP 000 13 18 -1747 08/18/00 <50 <5 <5 <5 <5 1460 3483 NP 000 1318 -2165 11/09/00 <50 <0 18 <0 14 <0 18 <0 26 772 35 62 NP 000 13 18 -2244 02/15/01 <50 <0 3 <02 <0 2 <04 976 3182 NP 000 13 18 -1864 05/17/01 SAMPLE BROKEN 3869 NP 000 13 18 -2551 05/24/01 239 000 55 800 73 600 10 000 58 600 2 900 13 18 - 08/16/01 151,000 6 880 8,930 927 4,910 367 4023 NP 000 13 18 -2705 11/08/01 9,100 341 44J <20 <40 5 570 4059 NP 000 13 18 -2741 02/21/02 141 000 17 500 26 100 2,850 15 300 932 37 51 NP 000 13 18 -2433 172TAB 1 XLS Page 8 of 11 3/14/02