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TABLE
<br /> CUMULATIVE RESULTS OF GROUNDWATER SAMPLING AND ANALYSES
<br /> . QUIK STOP MARKET NO.132
<br /> 3555 WEST HAMMER LANE
<br /> STOCKTON,CALIFORNIA
<br /> Ethyl- Total Wets Depth to Groundwater
<br /> Date TPW-G Semens Toluene benzene Xylenes MTBE CO2 evationGroundwater Elevatlon
<br /> Sam led u IL u !L u IL u IL u !L u 1L m 1L �ftEbl
<br /> aove MSL feet ft above MSL
<br /> Well M1N 5
<br /> 04108!91 210 3.4 <0.50 <0.50 2.1 3.38 14.2 -10,82
<br /> 07131191 1,900 28 8.5 30 7.1 15.27 -11.89
<br /> 09111/91 1,100 2.6 1.9 18 2.3 15.45 -12.07
<br /> 10115/91 4,200 <0.50 3.3 24 1.3 15.66 -12.28
<br /> 12118191 1,200 <0.50 1.3 1.7 0.6 15.66 -12.28
<br /> 03118/92 670 <0.50 <0.50 <0.50 <0.50 14.72 -11.34
<br /> 05/05/92 610 <0.50 <0.50 <0.50 <0.50 14.76 -11.38
<br /> 06116192 650 2.9 <0.50 <0.50 <0.50 15.11 -11.73
<br /> 09/22/92 310 50.50 <0.50 0.63 <0.50 15.59 -12.21
<br /> 10!26!92 330 <0.50 1 0.94 0.72 NA NA
<br /> 12/21/92 350 <0.50 0.7 0.6 0.7 17.79 -14.41
<br /> 03/17/93 280 <0,50 <0.50 0.6 0.7 12.85 -9.47
<br /> 06118/93 500 1 <0.50 <0,50 <0.50 12.36 -8.98
<br /> 12/17/93 <50 <0,50 <0.50 <0.50 <0.50 13.2 -9.82
<br /> 03/25/94 <50 40.50 <0.50 <0.50 <0.50 12.82 -9.44
<br /> 06/21194 <50 <0,50 <0.50 <050 <0.50 12.69 -9.31
<br /> 08102194 53 -40.50 50.50 <0.50 <0.50 12.85 -9.47
<br /> 09113194 <50 <0.50 <0,50 -40.50 <0.50 13.14 -9.76
<br /> 12109/94 56 <0.50 <0.50 <0.50 <0,50 13.74 -10.36
<br /> 02!22195 <50 <0.50 <0.50 <0.50 <0.50 12.18 -8.80
<br /> 03/16/95 <50 <0.50 <0.50 50.50 <0.50 11.37 -7.99
<br /> 05/26/95 450 50.50 <0.50 <0.50 <0.50 NR NR
<br /> 06/22/95 <50 <0.50 40.50 -40.50 <0.50 11.36 -7.98
<br /> 09/26/95 <50 -40.50 <0.50 -40.50 <0.50 790 12.35 -8.97
<br /> 12/21/95 <50 <0.50 <0.50 <0.50 <0.50 750 12.24 -8.86
<br /> 03/06/96 -250 <2.50 <2.50 <2.50 <2.50 1,100 670 10.67 -7.29
<br /> 06/04/96 -125 41.2 <1.2 <1.2 <1.2 660 NR 10.25 -6.87
<br /> • 09/17/96 <50 <0.50 <0.50 <0.50 40.50 510 NR 11.2 -7.82
<br /> 12/09196 <50 <0.50 <0.50 <0.50 -40.50 350 NR 11.29 -7.91
<br /> 02/11197 <50 <0.50 <0.50 <0.50 <0.50 340 NR 8.75 -5.37
<br /> 06/09/97 <50 <0.50 <0.50 <0.50 -40.50 220 NR 9.65 -6.28
<br /> 09/03/97 <50 <0.50 <0.50 <0.50 <0.50 1,100 NR 3.38 10.34 -6.96
<br /> 12104/97 450 <0.50 <0.50 <0,50 <0.50 880 NR 10.75 -7.37
<br /> 03110/98 <50 <0,50 <0,50 <0.50 <0.50 1,400 NR 6.95 -3.57
<br /> 06108!98 <50 <0.50 <0.50 <0.50 .40.50 1,600 NR 7.76 -4.38
<br /> 09/22/98 <50 40.50 <0.50 <0.50 <0.50 2,100 NR 9.25 -5.87
<br /> 12103/98 <50 <0,50 <0.50 <0.50 -40.50 2,500 NR 9.48 -6.10
<br /> 03/17/99 <50 <0.50 -40.50 <0.50 <0.50 1,970 NR 8.84 -5.46
<br /> 06!07199 4,700 <25 <25 <25 <25 2,900 NR 8.40 -5.02
<br /> 09/02/99 1,700 5.0 <2.5 -2.5 <2.5 7,800 NR 9.48 -6.10
<br /> 12/09/99 4,600 <25 32 <25 55 6,300 NR 10.02 -6.64
<br /> 03/27/00 2,500 <12.5 <12.5 <12.5 <12.5 7,000 NR 7.36 -3.98
<br /> 06/15/00 -45000 -50 <50 <50 <50 5,500 NR 8.21 -4.83
<br /> 09/18/00 3,100 <10 <10 <10 <10 2,500 NR 9.39 -6.01
<br /> 11130/00 2,700 27 39 <25 <25 3,400 NR 9.84 -6.46
<br /> 02!23101 2,800 -0.50 <0.50 <0.50 64 3,400 NR 9.75 -6.37
<br /> 05122101 1,000 <10 <10 <10 410 2,000 NR 9.00 -5.62
<br /> 08123101 1,600 <10 <10 <10 <10 2,400 NR 10.02 -6.64
<br /> 11130/01 -41000 <20 <20 <20 <20 2,800 NR 10.58 -7.20
<br /> 02127102 <1000 <10 <10 <10 <20 2,200 NR 9.70 -6.32
<br /> 05/31/02 4500 <5.0 <5.0 <5.0 <10 1,500 NR 9.55 -6.17
<br /> 0873002 <2500 <25 <25 <25 <50 2,200 NR 10.36 -6.98
<br /> 11/19/02 42500 <25 <25 <25 <50 2,100 NR 10.84 -7.46
<br /> 03/06/03 1600^ <10 <10 410 <20 1,800 NR 10.58 -7.20
<br /> 05128/03 <1000 410 <10 <10 <20 2,200 NR 10.39 -7.01
<br /> 09111103 1300^ 410 <10 <10 <20 1,300 NR 10.99 -7,61
<br /> 01/30/04 610A <5.0 <5.0 <5.0 <10 730 NR 10.54 -7.16
<br /> 03130/04 960^ <5.0 <5.0 <5,0 <10 1,100 NR 10.03 -6.65
<br /> 06/17/04 800^ <5.0 45.0 -5.0 <10 740 NR 10.11 -6.73
<br /> 09/30104 660^^ <5.0 <5.0 <5.0 <10 570 NR 11.18 -7.80
<br /> 12/14104 730^ <5.0 <5.0 45.0 <10 310 NR 10.81 -7.43
<br /> 03/14/05 NR NR NR NR NR 190 NR 9.17 -5.79
<br /> 05/24/05 NR NR NR NR NR 410 NR 9.10 -5.72
<br /> 08!24105 NR NR NR NR NR 200 NR 9.84 -6.46
<br /> • 08124105 NR NR NR NR NR 190 NR micropurge 9 B4 -6.46
<br /> 11130/05 <50 -40.50 <0.50 <0.50 <1.0 92 NR 10.68 -7.30
<br /> Page 5 of 9
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