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TA* 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION##172, STOCKTON, CA <br /> ALPARAM+ , <br /> " K <br /> Ai <br /> 02/25/97 1,700 tt,000 14,000 1 300 7 100 *52 000 4040 NP 000 13 18 -2722 <br /> 05/28/97 63 000 13 000 16 000 250 8 000 *<2 500 43 80 NP 000 13 18 3062 <br /> 081t9197 86,000 20 000 26 000 2 300 14,000 1,600 41 65 NP 000 13 18 -2847 <br /> 11/26/97 63 000 22 000 24 000 <I50 11,000 2 300 4065 NP 000 13 18 -2747 <br /> 02/18/98 130,000 20,000 15,000 <60 13 000 3,500 39 10 NP 000 13 18 2592 <br /> 05/27/98 54 000 13 000 6 000 75 9 900 2 300 4060 NP 000 13 18 -2742 <br /> 08/26/98 28 000 4 500 900 <03 3 500 2 100 3630 NP 000 13 18 -23 12 <br /> 11/24/98 23,000 5 400 1,100 <6 4 400 <20 3460 NP 000 13 18 -2142 <br /> 02/18/99 22,000 5 000 1 200 <6 5,200 1900 32 10 NP 000 13 18 -1992 <br /> 05/20/99 34 000 6 000 1,300 <30 6 000 1 700 3255 NP 000 13 18 -1937 <br /> 08/18199 140 000 28 000 32 000 1 500 17,000 1 100 3563 NP 000 13 18 -2245 <br /> 111t0199 28 000 4 700 4300 <60 2 900 1,200 3716 NP 000 13 18 -2398 <br /> 02/23/00 5 000 1 440 1 240 <12 1 420 *128011 110 3869 NP 000 13 18 -25 51 <br /> 05/10/00 2 140 19 <0 25 <0 25 t 9 1 350 3065 NP 000 1318 -1747 <br /> 08/18/00 <50 <5 <5 <5 <5 1,460 3483 NP 000 1318 2165 <br /> 11/09/00 <50 <0 18 <0 14 <0 18 1 <0 26 772 3562 NP 000 13 18 -2244 <br /> 02/15/01 <50 <03 <02 <02 <04 976 3182 NP 000 1319 -1864 <br /> 05117/01 SAMPLE BROKEN 3869 NP 000 1318 25 51 <br /> 05124101 239 000 55 800 73 600 10,000 58 600 2 900 - - 13 18 - <br /> 08/16/01 151,000 6,880 8,930 927 4 910 367 4023 NP 000 13 18 -2705 <br /> t 1108101 9 100 341 441 <20 <40 5 570 4059 NP 000 13 18 -2741 <br /> 02/21/02 141,000 17,500 26,100 2 850 15,300 932 3751 NP 000 13 18 2433 <br /> 05122/02 127 000 18 300 25 100 1,530 11 500 786 31 85 NP 000 13 18 1867 <br /> 08/14/02 49 900 12,100 10,500 <17 8 800 783 3256 NP 000 13 18 -1938 <br /> 11/20/02 5,170 190 18 179 421 32 3409 NP 000 13 18 -2091 <br /> 02/12/03 <15 <022 <032 <031 <04 31 3256 NP 000 1318 1938 <br /> 05/21/03 61 700 9,820 9,000 158 1 4,690 4,500 3947 NP 000 13 18 -2629 <br /> 08/20/03 144000 2,600 2,910 <15 5 4 360 39,500 3852 NP 000 13 18 -2534 <br /> 11!26103 38 600 5 670 8 150 397 3 180 127 3926 NP 000 13 18 2608 <br /> 02/05/04 61,000 3 550 7 000 5 380 31,400 156 3793 NP 000 13 18 -2475 <br /> NOTE ND=Nondetectable <br /> =Not analyzed/Not available Benzene toluene,ethlybenzene,and xylene analyzed by EPA method 8020 <br /> NP=No free hydrocarbon product Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015 modified for gasoline <br /> MTBE by 8020 or 8020/8260 Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8118100 and beginning 2115101 BTEX and MTBE analyzed by EPA Method 8260E <br /> 172TAB 1 XtS Page 10 of 10 311104 <br /> i <br />