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I <br /> Tat <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 Deptb to TOC GW <br /> Number ugIL ug/L ug/L uglL ug/L GW Elevation Elevation Comments <br /> MW-10 12/02/98 2087 Wellhead Survey Data <br /> (screened 12/30/98 180 <0 50 <0 50 <0 50 <0 50 45 84 -2497 no odor/no sheen <br /> interval- 03/26/99 140 0 64 <0 50 <0 50 0 72 4165 -2078 no odor/no sheen <br /> 41'-66') 06/02/99 160 <0 50 <0 50 <0 50 <0 50 4096 -2009 no odor 1 no sheen <br /> 08/31/99 120 <0 50 <0 50 <0 50 <0 50 4574 -2487 no comment <br /> 12/09/99 56 <0 50 <0 50 <0 50 <0 50 4746 -2659 no comment <br /> VW-1 03/26/99 260,000 3,000 1,800 9,100 44,000 4158 nm nm no odor/no sheen <br /> (screened 06/02/99 84,000 2000 56,000 5,400 26,000 4092 nm slight odor/no sheen <br /> interval- 08/31/99 ns ns ns ns ns dry nm Well dry at 43 9 feet <br /> 34'-44') 12/09/99 ns ns ns ns ns dry nm Well Dry <br /> VW-2 03/26/99 ns ns ns ns ns dry nm nm Well dry at 24 0 feet <br /> (screened 06/02/99 ns ns ns ns Its dry nm slight odor/no sheen <br /> interval= 08/31/99 ns ns ns ns ns dry nm Well Dry <br /> 1S'-25) 12/09/99 ns its ns ns ns dry nm Wel I Dry <br /> Notes <br /> TPHg=total petroleum hydrocarbons as gasoline µg/L= micrograms per liter=parts per billion(ppb) nm=not measured <br /> B=benzene E=ethylbenzene GW=Groundwater na=not analyzed <br /> T=toluene X=xylenes TOC=Top Of Casing ns=not sampled <br /> Depths and Elevations recorded in feet <=less than indicated det <-less than indicated det nm=not measured <br /> I <br /> 99QMTable 04 Page 3 of 3 HORIZON ENVIRONMENTAL I17G <br />