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Table 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 419 <br /> 2350 Waterloo Road,Stockton,California <br /> Well Date TPHg Benzene Toluene E-benzene Xylenes Depth to TOC GW <br /> Number ug/L ug/L ug/L ug/L ug/L GW Elevation Elevation Comments <br /> MW-7 11/12/98 2055 Wellhead Survey Data <br /> 12/30/98 340 48 10 7 4 2 2 4543 -24 88 no odor/no sheen <br /> MW-8 11/12/98 20.38 Wellhead Survey Data <br /> 12/30/98 68 12 076 <0 50 081 4536 -2498 no odor/no sheen <br /> MW-9 11/12/98 2065 Wellhead Survey Data <br /> 12/30/98 1,500 73 18 160 64 4559 -24 94 slight odor/no sheen <br /> MW-10 12/02/98 2087 Wellhead Survey Data <br /> 12/30/98 180 <0 50 <0 50 <0 50 <0 50 4584 -2497 1 no odor/no sheen <br /> Notes <br /> TPHg=total petroleum hydrocarbons as gasoline pg/L= micrograms per liter=parts per billion(ppb) <br /> B=benzene GW=Groundwater <br /> T=toluene TOC=Top Of Casing <br /> E=ethylbenzene na=not analyzed <br /> X=xylenes Depths and Elevations recorded in feet <br /> 98QM Table 1 Page 2 of 2 HORIZON ENVIRONMENTAL INC. <br />