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TABLE 1 <br /> GROUNDWATER DATA <br /> THRIFTY OIL STATION #172, STOCKTON, CA <br /> DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER <br /> SAMPLED TPH BENZENE TOLUENE EthylBenzene XYLENE MTBE PRODUCT GROUNDWATER THICKNESS ELEVATION ELEVATION <br /> (ug/L) (ug/L) (ug/L) (ugh) (ug/L) (ug/L) (feet) (feet) (feet) (feet) (feet) <br /> 11/27/07 <5.6 <0.18 <0.24 <0.21 <0.45 <0.19 NP 37.85 0.00 11.52 -26.33 <br /> 02/20/08 <6.6 <0.18 <0.24 <0.21 <0.45 <0.19 NP 34.96 0.00 11.52 -23.44 <br /> 05/22/08 55 <0.18 <0.24 <0.21 <0A5 <0.19 NP 33.47 0.00 11.52 -21.95 <br /> 08/20/08 <6.6 <0.18 <0.24 <0.21 <0.45 <0.19 NP 34.80 0.00 11.52 -23.28 <br /> 11/05/08 <6.6 <0.18 <0.24 <0.21 <0.45 <0.19 NP 34.77 0.00 11.52 -23.25 <br /> NOTE: ND=Nondetectable Benzene,toluene,ethlybenzene,and xylene analyzed by EPA method 8020, <br /> =Not analyzed/Not available Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015 modified for gasoline <br /> NP=No free hydrocarbon product Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 <br /> MTBE by 8020 or 8020/8260 On 8/18/00 and beginning 2/15/01 BTEX and MTBE analyzed by EPA Method 8260B { <br /> 172TAB1.XLS Page 2 of 2 <br />