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TAB#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 Et6ylBenzene XYLENE MTBE GROUNDWATER PRODUCT' THICKNESS ELEVATION ELEVATION <br /> (ugL) (►g) (uP�) (UWL) (aP�) (> L) (feet) (feet) (feet) (feet) (feet) <br /> 05/17/01 SAMPLE BROKEN 38 69 NP 000 13 18 2551 <br /> 05124!01 239,000 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 /> 11/08/01 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 /> 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 [9 38 <br /> 11/20102 5 170 190 18 179 421 32 3409 NP 000 13 18 2091 <br /> 02/12103 <15 <0 22 <0 32 <0 31 <04 31 3256 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 /> D8120103 144 000 2 600 2 910 <15 5 4 36(1 39 500 3852 NP 000 13 18 2534 <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-tent Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8118100 and beginning 2115101 BTEX and MTBE analyzed by EPA Method 8260B <br /> 172TABI?CLS Page 10 of 10 10110103 <br />