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• TAO 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION##171, STOCKTON,CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLED TPTI-g BENZENE TOLUENE EthylSenzene XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION <br /> (ug1L) (ug/L) (ug/1? 091L) Owl-) (ugiL) (feet) (feet) (feet) (meet) (feet) <br /> 08/07/02 <50 <0 08 <0 18 <0 17 <04 <0 07 4632 NP 000 1463 -3169 <br /> 1 U13/02 <50 <0 08 <0 18 <0 17 <0 4 75 4905 NP 000 1463 -3442 <br /> 02/19/03 <15 <0 22 <0 32 <0 31 <0 4 <0 18 4904 NP 000 1463 3441 <br /> 05/14/03 <15 <0 22 <0 32 <0 31 <04 <0 18 44 16 NP 000 1463 2953 <br /> 08/12/03 <15 <0 22 <0 32 <0 31 <0 4 <019 4804 NP 000 14 63 -3341 <br /> 11/24103 <15 <0 22 <0 32 <0 31 <0 4 <0 18 4987 NP 000 1463 -3524 <br /> 02/11/04 <15 <0 22 <0 32 <0 31 <0 4 18 47 14 NP 000 1463 -32 51 <br /> 05/12/04 55 <0 22 <0 32 <0 31 <0 4 13 45 87 NP 000 1463 -3124 <br /> 08/17/04 107 3 3 83 2 1 1 13 62 5056 NP 000 1463 -3593 <br /> MONITORING WELL#TB-11 Screen Intervals=5 to 30 eet and 35 to 60feet <br /> 02/25/99 <50 <0 3 <0 3 <0 3 <0 5 <20 3905 NP 000 - - <br /> 05114l99 DRY - <br /> 08/18/99 DRY <br /> MONITORING WELL#TB-12 Screen Intervals=5 to 30 eet and 35 w 60feet <br /> 02/25/99 4 400 49 081 <0 3 29 12 000 39 70 NP 0 00 <br /> 05/14/99 DRY <br /> 08/18/99 DRY <br /> NOTE ND=Nondetectable 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 /> " '=Not analyzed 1 Not avallable Methyl-cert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> MTBE by 8020 Beginning 8123/00,BTEX and MTBE analyzed by EPA Method 8260B <br /> 171 TABS XLS Page I I of ll 8131104 <br />