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TABLE 1 ' CUMULATIVE RESULTS OF GROUNDWATER SAMPLING AND ANALYSES QUIK STOP MARKET NO.132 3555 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) (ug/L) (ug/L) (ug/L) (ug/L) (mg1L) (ft above MSL) (feet) (ft above MSL) Well MW-5(copse'd) ' 03/17/93 280 <0.50 <0.50 0.6 0.7 12.85 -9.47 06118/93 500 1 <0.50 <0.50 <0.50 12.36 -8.98 12/17/93 <50 <0.50 <0.50 <0.50 <0.50 13.2 -9.82 03/25/94 <50 <0.50 <0.50 0.50 <0,30 12.82 -9.44 ' 06/21/94 <50 <0.50 <0.50 <0.50 <M012.69 -9.31 09/02194 53 <0.50 <0.50 <0.50 <0.50 12.85 -9.47 09/13/94 <50 <0.50 <0.50 <0.50 <0.50 13.14 -9.76 12109/94 56 <0.50 <0.50 <0.50 <0,50 13.74 -10.36 02/22/95 <50 <0.50 <0.50 <0.50 <0.5012.18 -8.80 03/16/95 <50 <0.50 <0.50 <0.50 <0,50 t 1.37 -7.99 05/26/95 <50 <0.50 <0.50 <0.50 <0,50 NR NR 06/22/95 <50 <0.50 <0.50 <0.50 <0.50 11.36 -7.98 ' 09/26/95 <50 <0.50 <0.50 <0.50 <0.50 790 12.35 -8.97 12/21/95 <50 <0.50 <0.50 <0.50 <0.50 750 12.24 -6.86 03/06/96 <250 <2.50 <2.50 <1.50 <2.50 1,100 670 10.67 -7.29 06/04/96 <125 <1.2 <1.2 <1.2 <1.2 660 NR 10.25 -6.87 09/17/96 <50 <0.5 <0.5 <0.5 <0.5 510 NR 11.2 -7.82 12/09/96 <50 <0.5 <0.5 <0.5 <0.5 350 NR 11.29 -791 02/11/97 <50 <0.5 <0.5 <0.5 <M 340 NR 8.75 -5.37 06/09/97 <50 <0.5 <0.5 <0.5 <0.5 220 NR 9.66 -6.28 09/03/97 <50 <0.5 <0.5 <0.5 <0.5 1,100 NR 3.38 10,34 -6.96 12/04197 <50 <1.5 <0.5 <0.5 <0.5 880 NR 10.75 -7.37 03/10/98 <50 <0.5 <0.5 <03 <0.5 1,400 NR 6.95 -3.57 ' 06/08198 <50 <0.5 <0.5 <0.5 <0.5 1,600 NR 7.76 -4.38 09/22/98 <50 <0.5 <0J <0.5 <0.5 2,100 NR 9.25 -5.87 12/03/98 <50 <0.5 <0.5 <0.5 <0.5 2,500 NR 9.48 -6.10 03/17/99 <50 <0.5 <0.5 <0.5 <0.5 1,970 NR 8.84 -5.46 ' 06/07/99 4,700 <25 <25 <25 <25 2,900 NR 8,40 -5.02 09/02/99 1,700 5.0 Q.5 4.5 <2.5 7,800 NR 9.48 -6.io 12/09/99 4,600 <15 32 <25 55 6,300 NR 10.02 -6.64 ' 03/27/00 2,500 <12.5 <12.5 <12.5 <12.5 7,000 NR 7.36 -3.98 06/15/00 <5000 <50 <50 <50 <50 5,500 NR 8.21 -4.83 09/18/00 3,100 <10 <10 <10 <10 2,500 NR 9.39 -6.01 11/30/00 2,700 27 39 <25 <25 3,400 NR 9.84 -6.46 02/23/01 2,800 <0.5 <0.5 <0,5 64 3,400 NR 9.75 -6.37 05/22/01 1,000 <10 <10 <10 <10 2,000 NR 9.00 -5.62 08/23/01 1,600 <10 <10 <10 <10 2,400 NR 10.02 -6.64 11/30101 <1000 <70 <20 <20 QO 2,800 NR 10.58 -7.20 02/27102 <1000 <10 <i0 <10 <20 2,200 NR 9.70 -6.32 05131102 <500 <5.0 <5.0 <5.0 <10 1,500 NR 9.55 -6,17 08/30/02 <2500 <25 <25 <25 <50 2,200 NR 10.36 -6.98 11/19102 <2500 <25 <25 <25 <50 2,100 NR 10.84 -7,46 03/06103 16001 <10 <10 <10 <20 1,800 NR 10.58 -7.20 05/28/03 <1000 <10 <10 <10 <20 2,200 NR 10.39 -7,01 09/11/03 1300^ <10 <10 <10 <20 1,300 NR 10.99 -7.61 ' 01/30104 610^ <5.0 <5.0 <5.0 <10 730 NR 10.54 -7.16 03/30/04 960^ <5.0 <5.0 <5.0 <10 1,100 NR 10.03 -6.65 06/17/04 800^ 05.0 <5.0 <5.0 <10 L 740 1 NR I0.11 1 -6.73 2:v�1latrvu1G sip t625111lu.�c 132 Page 6 of 10