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TAO 1 a <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION#172, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GRO[INDWAT <br /> SAMPLED TPH BENZENE TOLUENE EthylBeaxene XYLENE MTBE GR'DIU DV4ATER I'RQ)JIJGT THICKNESS ELEVATION ELEVATIgN <br /> (ugIL) (w ) (ug/L) (um) (ug(L) (ttgtl) (t et) Met) <br /> 02/21/02 - - - - - _ <br /> 05/22/02 <br /> 08/14/02 <br /> 11/20102 <br /> 02/12/03 <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-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> On 8118100 and beginning 2/15101 BTEX and MTBE analyzed by EPA Method 8260B <br /> 172TA61 XLS Page 13 of 13 34Y03 <br />