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i �TAB 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#172, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH It) DEPTH TO PRODUCT CASING 1GROUNDWATER <br /> SAMPLED TPH BENZENE j TOLUENE EthylBenzeue XYLFNF, MTBE GROUNDWATER PRODVCT THICKNESS ELEVATION ELEVATION <br /> (Ug/L) (� ) (uVQ (U�) (41) (411.) (fed) (feet) (feet) (feet) (feet) <br /> MONITORING WELL# VW-5A <br /> 02/18/99 <50 <03 <03 <03 <05 <20 3350 NP 000 <br /> 05/20/99 - - - - <br /> 08/18/99 - DRY - <br /> 11/10/99 - - <br /> 02/23/00 3620 NP 000 <br /> 05/10/00 DRY - <br /> 08/18/00 33 23 NP 000 <br /> 11/09/00 - <br /> MONITORING WELD#VW-6A <br /> 02/18/99 1,200 42 21 <03 87 7 100 3360 NP 000 <br /> 05/20/99 - - - - - - - <br /> 08/18/99 - DRY <br /> 11/10/99 <br /> 02/23/00 3526 NP 000 <br /> 05/10/00 DRY <br /> 08/18/00 3342 NP 000 <br /> 11/09/00 - - <br /> MONITORING WELL#VW-6B <br /> 02/18/99 1,400 60 20 <03 110 8,200 3360 NP 000 <br /> 05/20/99 - - - <br /> 08/18/99 - - - DRY <br /> 11/10/99 <br /> 02/23/00 DRY <br /> 05/10/00 DRY <br /> 08/18/00 DRY <br /> 11/09/00 <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 /> * —MTH6 by 8020 or 8020/8260 Methyl tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8/18100 BTEX and MTBE analyzed by EPA Method 8260B <br /> 172TAB1 XLS Page 9 of 9 11/29/00 <br />