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TAB 1 <br /> • <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION #171, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTU TO DEPTH TO PRODUCT CASTING GROUNDWATER <br /> SAMPLED (T'H-g BENZENE TOLUENE Et6yTBenzene XYLENT3 MTT31" GROUNDWATER T?RQUI7CT THICKNESS ELEVATi(JN ET,TE�ATION <br /> (ugn-) (ug/L) (ugIL) ( ) (U91L) (ug/ ) (feet) (feet) ( ) (feet) <br /> 27 39 <br /> 02/09/00 240 <0 3 <0 3 <0 3 <0 5 480 42 02 NP 000 14 63 -3043 <br /> 05/17/00 <50 <0 25 <0 25 <0 25 <05 492 45 06 NP 0 00 14 63 24 94 <br /> 08/23/00 90 92 <02 <0 2 <0 4 563 39 57 NP 000 14 63 <br /> MONITORING WELL#TE-Il <br /> 02/25/99 <50 <0 3 <0 3 <03 <05 <20 3805 NP 000 <br /> DRY <br /> 05114!99 <br /> DRY - <br /> 48118/99 - - - - <br /> MONITORING WELL#TBRI2 <br /> 02125!99 4,400 49 081 <03 2 9 12 000 D - <br /> 70 NP 0 <br /> _ - DRY - <br /> 05/14/99 - <br /> _ DRY - - <br /> 08/18/99 <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/Not available Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> MTBE by 8020 On 8123100 BTEX and MTBE analyzed by EPA Method 8260B <br /> 171 TAB i XL 5 Page 8 of 8 <br /> 9/2fl/00 � <br />