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TAB 1 GROUNDWATER DATA THRIFTY OIL STATION#1171, STOCKTON, CA - DATE ANALYTICAL PARAMETERS IDEPTH TQ DEPTH TO PRODUCT CASING GROUNDWATER SAMPLED TPH-g BENZENE TOLUENEEthyilienaene XYLENE MTBE GROUNDWATER PRODUCT THICKNE$$ ELEVATION ELEVATION (U91L) (1391-) (► ) (ug/1-) (119/L) fug(L) (feet) (feet) `feet) (feet) (feet} 08/12/98 <50 <03 <03 <03 <05 60 41 25 NP 000 93 16 5191 11/10/98 <50 <03 <03 <03 <05 58 5045 NP 000 93 16 4271 02/25/99 <50 <03 <03 <03 <05 76 3801 NP 000 1463 2338 05/14/99 <50 <03 <03 <03 <0 5 22 4200 NP 000 1463 -27 37 08/18199 <50 <0 3 <03 <0 3 <0 5 <20 3818 NP 000 14 63 -23 55 11/16/99 250 031 <0 3 <03 <05 500 4054 NP 000 1463 2591 02/09/00 240 <03 <03 <03 <05 480 4202 NP 000 1463 2739 05/17/00 <50 <0 25 <0 25 <0 25 <0 5 492 45 06 NP 000 1463 -3043 08/23100 90 92 <02 <02 <04 563 3957 NP 000 1463 -2494 11/15/00 <50 <03 <02 <02 <04 31 4350 NP 000 1463 -2987 02/14/01 <50 3 81 <02 <02 <04 14 3975 NP 000 1463 25 12 05/15/01 <50 <03 <02 <02 <04 43 3975 NP 000 1463 -2512 08/15/01 <50 <03 <02 <02 <04 <06 4350 NP 000 1463 -2887 11/06/01 <50 <03 <02 <02 <0 4 <06 4575 NP 000 1463 31 12 02/13/02 214 1 4 <0 2 <0 2 <04 114 4290 NP 000 1463 2827 MONMO)UNG WELL I TB-11 02/25/99 <50 <03 <03 <0 3 <0 5 <20 3805 1 NP L 000 05/14/99 - DRY 08/18/99 DRY MONITORING WELL#T&-I2 02/25/99 4 400 49 0 81 <0 3 2 9 12 000 3970 NP 000 05/14/99 - DRY - 08/18/99 DRY I I 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 I 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 8260B it 171 TAB XLS Page 9 of 9 318102