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TABLE 1 GROUNDWATER DATA THRIF FY OIL STATION #171, STOCKTON, CA DATE ANALYTICAL PARAMETERS I1LPTiI TO I) PII T PRODUCT CASING GRt)FfIN4'1'ATEI2 SAMPLED BENZENE TOLUENE FtbAWMzeke XYLENE h4TRE GROUNDWATER PItf1I3iTCI TIIICKNM ELEVATION EI1;VpA1T4N {c� } fes) ( OWL) (� } (fir) (feet (feet) 017 � } 05/14/99 <50 <0 3 <0 3 <03 <0 5 22 4200 NP 000 1463 -2737 08/18/99 <50 <03 <0 3 <03 <0 5 <20 38 18 NP 000 1463 -23 55 11/16/99 250 031 <03 <03 <05 500 4054 NP 000 1463 -2591 02/09/00 240 <03 <0 3 <03 <0 5 480 4202 NP 000 1463 -27 39 05/17/00 <50 <0 25 <0 25 <0 25 <05 492 4506 NP 000 1463 3043 08/23/00 90 92 <02 <02 <04 563 3957 NP 000 1463 2494 11/15/00 <50 <03 <02 <02 <04 31 43 50 NP 000 1463 -2887 02/14/01 <50 3 8I <02 <0 2 <04 14 3975 NP 000 1463 -2512 05/15/01 <50 <03 <02 <02 <04 43 39 75 NP 000 1463 -25 12 08/15/01 <50 <03 <0 2 <02 <04 <0 6 4350 NP 000 1463 -2887 11/06/01 <50 <0 3 <02 <02 <04 <06 45 75 NP 000 1463 -3112 02/13/02 214 14 <02 <02 <0 4 114 4290 NP 000 1463 -2827 05/07/02 <50 <03 <02 <0 2 <04 <06 4345 NP 6 00 1463 -28 82 08/07/02 <50 <0 08 <018 <0 17 <04 <0 07 4632 NP 000 1461 -3169 11/13/02 <50 <0 08 <0 18 <0 17 <04 75 4905 NP 000 1463 -3442 02/19/03 <15 <0 22 <0 32 <0 31 <04 <0 18 4904 NP 000 1463 3441 MONITORING SLI.M-11 02/25/99 <50 <03 <03 <0 3 <0 5 <20 3805 NP 000 051l4199 DRY 08/18/99 DRY MOXITORMG WELL#TB-I2 02/25/99 4 400 49 081 <0 3 29 12 000 39 70 NP 000 05/14/99 - - DRY 08/18/99 1 - DRY LEE- NOTE ND=Nondeteetable 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 tett Butyl Ether(MTBE)analyzed by EPA method 8020 or 8260 "•"=MTBE by 8020 Beginning 8123100,BTEX and MTBE analyzed by EPA Method 8260B I I I 171 TAB 1 XL S Page 10 of 10 3120103