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TABLE 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#171, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTHTO PRODIXT CASING GROL1t <br /> SAMPLED TPH-g BENZENE TOLUENE Ethylllenzeae XYLENE MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELFWA,TION <br /> (ugA ) (ug/L) (ug/L) (UgIL) 091L) (ug/L) Owt) (feet) (feet) (feet) (feet) <br /> 08/12/98 <50 <03 <0 3 <03 <05 60 4125 NP 000 93 16 5191 <br /> 11/10/98 <50 <03 <0 3 <03 <05 58 5045 NP 000 93 16 4271 <br /> 02/25/99 <50 <0 3 <03 <03 <05 76 3$O1 NP 000 14 63 23 38 <br /> 05/14/99 <50 <03 <03 <0 3 <05 22 4200 NP 000 1463 -2737 <br /> 08/18/99 <50 <03 <0 3 <0 3 <05 <20 3818 NP 000 1463 -23 55 <br /> 11/16/99 250 031 <0 3 <03 <05 500 4054 NP 000 1463 2591 <br /> 02/09/00 240 <0 3 <0 3 <03 <05 480 4202 NP 000 1463 -2739 <br /> 05/17/00 <50 <0 25 <0 25 <0 25 <0 5 492 4506 NP 000 1463 -3043 <br /> 08/23/00 90 92 <02 <02 <04 563 39 57 NP 000 1463 -2494 <br /> 11/15/00 <50 <0 3 <02 <02 <04 31 4350 NP 000 1463 2887 <br /> 02/14/01 <50 3 8 J <02 <02 <04 14 3975 NP 000 1463 -2512 <br /> 05/15/01 <50 <0 3 <02 <02 <04 43 3975 NP 000 1463 -25 12 <br /> MONITORING WELL#TB-II <br /> 02/25/99 <50 <03 <03 <0 3 <05 <20 3805 NP 000 <br /> 05/14/99 - - - - - DRY - <br /> 08/18/99 DRY <br /> MONITORING WELL#TB-I2 <br /> 02/25/99 4 400 49 0 81 <0 3 29 12 000 39 70 NP 000 <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 I Not available Methyl tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> MTBE by 8020 Beginning 8123100 BTEX and MTBE analyzed by EPA Method 8260B <br /> 171 TAB i XL S Page 9 of 9 616101 <br />