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Table 1 Cumulative Results of Groundwater Sampling and Analyses Quik Stop Market No. 132 2555 West Hammer Lane Stockton, California Ethyl- Total Well Depth to Groundwater Date TPH-G Benzene Toluene benzene Xylenes MTBE CO2 Elevation Groundwater Elevation Sampled (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (uglL) (mall.) (ft above MSL) (feet) (ft above MSL) Well MW-7(Cont.) 12/17/93 <50 <0.50 <0.50 <0.50 <0.50 13.52 -10.3 03/25/94 <30 <0.50 <0.50 <0.50 <0.50 13.25 -10.03 + 06/21/94 <50 <0.50 <0.50 <0.50 <0.50 13.21 -9.99 09/13/94 <50 <0.50 <0.50 <0.50 <0.50 13.65 -10.43 12/09/94 <50 <0.50 <0.50 <0.50 <0.50 14.02 -10.8 03/16/95 <50 <0.50 <0.50 <0.50 <0.50 11.6 -8.38 06/22/95 <50 <0.50 <0.50 <0.50 <0.50 11.8 -8.58 09/26/95 <50 <0.50 <0.50 <0.50 <0.50 740 12.65 -9.43 12/21/95 <50 <0.50 <0.50 <0.50 <0.50 700 12.55 -9.33 03/06/96 <50 <0.50 <0.50 <0.50 <0.50 <2.5 690 10.82 -7.6 06/04/96 <50 <0.50 <0.50 <0.50 <0.50 <2.5 NR 10.57 -7.35 09/17/96 <50 <0.50 <0.50 <0.50 <0.50 <2.5 NR 11.53 -8.31 12/09/96 <50 <0.50 <0.50 <0.50 <0.50 <2.5 NR 11.42 -8.2 02/11/97 <50 <0.50 <0.50 <0.50 <0.50 <2.5 NR 9 -5.78 06/09/97 NR NR NR NR NR NR NR 9.87 -6.65 09/03/97 NR NR NR NR NR NR NR 10.56 -7.34 12/04/97 NR NR NR NR NR NR NR 10.84 -7,62 03/10/98 NR NR NR NR NR NR NR 7.11 -3.89 06/08/98 <50 <0.50 <0.50 <0.50 <0.50 <5 NR 7.73 4.51 09/22/98 <50 <0.5 <0.5 <0.5 <0.5 <5.0 NR 9.28 -6.06 12/03/98 1 <50 1 <0.5 1 <0.5 1 <0.5 1 <0.5 I <5.0 NR 9.42 -6.20 Notes: 1PH-G denotes total petroleum hydrocarbons as gasoline MTBE denotes methyl-tent-butyl ether R denotes analysis not requested ug/1 denotes micrograms per liter CO2 denotes carbon dioxide ft denotes feet mg/l denotes milligrams per liter NA denotes not available MSL denotes mean sea level <denotes not detected above listed detection limit for the method The 12-3-98 MTBE analyses for all wells performed by EPA Method 8260 r PLS\H,1LEHRMANRQUEKSTOP1l321GwsamplTABLE 1 Page 7 of 7