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TAN? 1 • <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#172, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATE <br /> SAMPLED TPH BENZENE TOLUENE EthylBenzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> (ug(L) (WJL.) (ug1L) (uglL) (ug(L) (ug1L) (feet) (feet) (feet) (feet) (feet) <br /> 08118/49 140 000 28 000 32,000 1 500 17,000 1 100 35 63 NP 000 13 18 -2245 <br /> 11/10/99 28 000 4,700 4300 <60 2 900 1 200 37 16 NP 000 13 18 -2398 <br /> 02123/00 5 000 1 440 l 240 <12 1 420 *1 280/1 110 38 69 NP 000 13 18 -2551 <br /> 05/10/00 2 140 19 <0 25 <0 25 19 1 350 3065 NP 000 13 18 1747 <br /> 08118/00 <50 <5 <5 <5 <5 1,460 3483 NP 000 13 18 2165 <br /> 11/09/00 <50 <0 18 <0 14 <0 18 <0 26 772 35 62 NP 000 13 18 2244 <br /> 02/15101 <50 <03 <02 <02 <04 976 31 82 NP 000 13 18 1864 <br /> 05117/01 SAMPLE BROKEN 3869 NP 000 13 18 -25 51 <br /> 05/24/01 239 000 55 800 73 600 10000 58 600 2 900 - - 13 18 - <br /> 08/16101 151 000 6 880 8 930 927 4 910 367 4023 NP 000 13 18 -2705 <br /> 11/08101 9 100 341 44 J <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 37 51 NP 000 13 18 2433 <br /> 05/22/02 127 000 18 300 25 100 1 530 11,500 786 3185 NP 000 13 18 1867 <br /> 08/14/02 49 900 12,100 10 500 <17 8 800 783 32 56 NP 000 13 18 1938 <br /> 11/20102 5 170 190 18 174 421 32 3409 NP 000 13 18 2091 <br /> 02/12/03 <15 <0 22 <0 32 <0 31 <04 31 32 56 NP 000 13 18 -1938 <br /> 05/21/03 61 700 9 820 9 000 1581 4 690 4 500 3947 NP 000 13 18 -2629 <br /> 08/20/03 144 000 2 600 2 910 <15 5 4 360 39 500 38 52 NP 000 13 18 -25 34 <br /> 11/26/03 38 600 5 670 8 150 397 3 180 127 3926 NP 000 13 18 -2608 <br /> NOTE ND=Nondetectable <br /> '=Not analyzed 1 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 tent Butvl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8118100 and begmnmg 2115/01 BTEX and MTBE analyzed by EPA Method 8260B <br /> i <br /> I <br /> I <br /> 172TABI XLS Page 10 of 10 12/11/03 <br />