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TABLE 1 GROUNDWATER DATA THRIFTY OIL STATION#171,STOCKTON, CA DATE ANALYTICAL PARAMETERS DEPTH TO DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENE EthYlBenzene XYLEM~ MTBE GROUNDWATER PRODUCT THICKNESS ELEVATION ELEVATION (ug/L) (ugfL) (UgA) (ug/L) (u€/L) €u€(L) (feet) (feet) (feet) (feet) (feet) 08115/01 <50 <03 <02 <0 2 <0 4 <06 4350 NP 000 1463 -28 87 11/06101 <50 <0 3 <0 2 <02 <0 4 <06 45 75 NP 000 1463 -31 12 02/13/02 214 14 <0 2 <02 <0 4 114 4290 NP 000 1463 -2827 05/07/02 <50 <0 3 <02 <0 2 <04 <0 6 43 45 NP 000 1463 -28 82 08/07/02 <50 <0 08 <0 18 <017 <04 <0 07 4632 NP 000 1463 31 69 11/13/02 <50 <0 08 <018 <017 <04 75 4905 NP 000 1463 -3442 02!19/03 <15 <0 22 <0 32 <033 <04 <0 18 4904 NP 000 1463 -3441 05/14/03 <15 <022 <0 32 1 <0 31 <0 4 <0 18 44 16 NP 000 1463 2953 08/12103 <15 <0 22 <0 32 <0 31 <0 4 <0 18 4804 NP 000 1463 3341 11124/03 <15 <0 22 <0 32 <0 31 <0 4 <018 4987 NP 000 1463 3524 02111!04 <15 <0 22 <0 32 <0 31 <04 18 47 14 NP 000 1463 -32 51 05172/04 55 <0 22 <0 32 <0 31 <0 4 13 45 87 NP 000 1463 -3124 08/17/04 107 3 3 83 2 1 J 13 62 50 56 NP 000 1463 -35 93 11/23/04 110 <0 22 <032 <0 31 <04 38 5149 NP 000 1463 -3685 MONITORING WELL#TB-11 Screen Intervals=5 to 30 eel and 35 to 60feet 02/25/99 <50 <0 3 <0 3 <0 3 1 <0 5 <20 3905 NP 000 05/14/99 DRY - 08/18/99 DRY - MONITORING WELL#TB-12 Screen Intervals=5 to 30 eel and 35 to 6© eel 02!25!99 4 400 49 0 81 <0 3 29 12 000 3970 NP 000 05/14/99 - - - DRY - 08/18/99 DRY ]A- - NOTE ND=Nondetectable Benzene toluene ethlybenzene and xylene analyzed by EPA method 8020 NP=No free hydrocarbon product Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015 modified for gasoline Not analyzed)Not available Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 * =MTBE by 8020 Beginning 8123100 BTEX and MTBE analyzed by EPA Method 8260E 171 TAB 1 XL S Puge I/of/1 12/10/2004