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TABLE 1 GROUNDWATER MONITORING DATA Quik Stop No.39 2285 Fremont Street,Stockton,California totalTOC GW Well TPHm TPHg B T E X MTBE DIPE ETBE TAME TBA meth eth DCA DBA Pb DTW elev elev Number Date (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)(ug/L)(ug/L)(ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet msi) (feet msl) Comments MW-3 12/15199 na 360 <0.50 <0.50 4.50 <0.50 <5.0 na na na na na na na 44.08 20.38 -23.70 screened 05/19100 na 710 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na na 40.73 -40.73 nocomment Interval 08/31100 na 480 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na na 44.38 -44.38 no comment 40'-60' 11/02/00 na 310 <0.50 <0.50 <0.50 <0.50 <0.50 -0.50 <0.50 <0.50 26 <50 <5.0 160 <0,50 na 44.83 20.40 -24.43 no odor/no sheen 03/26/01 na 270 <0.50 2.1 <0.50 5.4 <0.50 <0.50 <0.50 <0.50 23 na na na na na 42.94 -22.54 no odor/no sheen 06/21/01 na 310 <0.50 4.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 26 <50 <5.0 na na na 44.24 -23,84 no odor/no sheen 09/17/01 na 210 <0.50 1.5 <0.50 <0.50 <5.0 <5.0 na na na na na na na na 47.49 -27.09 no odorino sheen 11/29/01 na 130 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 15 <50 <5.0 na na na 47.55 -27.15 no odor/no sheen OZ18/02 <100 130 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 8.9 <50 <5.0 150 <0.50 6.8 46.22 -25.82 no odorino sheen 05102/02 <100 150 <0.50 0.52 <0.50 <0 50 <0.50 <0.50 <0.50 <0.50 15 <50 <5.0 130 <0.50 na 46.02 20.13 -25.89 no odor/no sheen 08122/02 <100 210 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 19 na na 210 na na 49.98 -29.85 no odor/no sheen 11112102 na 150 <0.50 <0.50 <0,50 1.1 4.50 <0.50 <0.50 <0.50 12 na na 100 na <0.0050' 50.82 -30.69 no odor/no sheen 01131/03 na 140 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 8.5 na na 100 na na 49.17 -29.04 no odorino sheen 05102/03 na 130 <0.50 0.57 <0.50 <0.50 <0.50 <0.50 4.50 <0.50 <5.0 na na 120 na na 47,73 -27.60 no odor/no sheen 08107/03 na 160 <0.50 <0.50 1.2 <0.50 <0.50 4.50 <0.50 <0350 <8.0 na na 100 na na 50.21 -30.08 no odor/no sheen 10128/03 na 110 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 9B na na 51.65 -31.52 no odor/no sheen 02!03104 na 90 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na <5.0 79 na na 50.08 -29.95 no odorino sheen 06115/04 na 66 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na na 86 <0.50 na 50.94 -30.81 no odorino sheen 08/20/04 na 86 <0.50 4.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na na 85 <0.50 na 52.48 -32.35 no odor/no sheen 11/30!04 na 92 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na na 79 <0.50 na 52.68 19.93 -32.75 no odor/no sheen MW-4 11/30104 na <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na na <0.50 4.50 na 54.25 21.53 -32.12 no odor/no sheen screened interval 45'-65' MW-5 11117/04 na <50 <0.50 <0.50 x0.50 <0.50 <0.50 4.50 <0.50 <0.50 <5.0 na na <0.50 <0.50 na 53.41 20.46 -32.95 no-oft/no sheen screened interval 45'-65' MW-6 11/17/04 na <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 4.50 <5.0 na na <0.50 <0.50 na 54.36 21.35 -33.03 no odorino sheen screened interval 45'-65' 11 TPHm.=total petroleum hydrocarbons as motor oil MTBE=methyl tert-butyl ether DCA-1,2-dichloroethane <=less than indicated reporting limit TPHg=total petroleum hydrocarbons as gasoline DIPE=diisopropyl ether DBA=1,2-dibromoethane ns=not sampled B=benzene ETBE=ethyl tert-butyl ether total Pb=total lead nm=not measured T=toluene TAME=tert-amyl methyl ether •=soluble lead DTW=depth to groundwater E=ethylbenzene TBA=tart-butanol GW=groundwater X=total xylenes meth=methanol TOC=top of casing oth=ethanol elev=elevation msl=mean sea level 039gmr04.xl9 7039.45 Page 2 of 2 HORIZON ENVIRONMENTAL INC.