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• Tqe 1 • <br /> Groundwater Monitoring Data <br /> Beacon Station No 641 <br /> 1210 E. Hammer Lane,Stockton,California <br /> Well Date TPHg B T E X MTBE DIPE ETBE TAME TBA Meth Eth EDC EDB Depth to TOC GW <br /> Number ug/L ug/L ug/L ug/L u&LL ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L GW Elevatio Elevaho Comments <br /> VW-S 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm <br /> screen 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm <br /> interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm 0 05 ft FP/sheen <br /> 22'-32' 12/09/99 100,000 1 13,000 10,000 570 16,000 31,000 X20 <20 <20 <200 <2000 X200 <20 <20 4570 nm no comment <br /> VW-6 03/25/99 ns ns ns ns ns ns ns ns ns ns ns its its ns nm nm nm <br /> screen 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm <br /> interval 08/31/99 ns its ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm sheen <br /> 401-50l' 12/09/99 ns Its ns as ns ns ns ns ns ns ns ns ns ns dry nm no comment <br /> VW-7 03/25/99 25,000 5,700 3,300 1,500 1,700 2,000 <5 0 <5 0 <5 0 200 <50 <5 0 na na 4167 nm nm slight odor/no sheen <br /> screen 06/02/99 11,000 3,300 320 1,100 230 1,700 <5 0 <5 0 <5 0 92 <100 <5 0 <5 0 <5 0 41 94 nm slight odor I no sheen <br /> interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4735 nm 0 21 ft FP/sheen <br /> 401-W 12/09/99 87,000 2,300 1,000 1,500 5,400 6,400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment <br /> VW-8 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm well dry Q 3175 <br /> act 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm well dry @ 3175 <br /> inteml 08/31/99 ns ns ns ns ns ns ns ns ns ns ns its ns ns dry nm no comment <br /> 21-32' 12/09/99 ns I as ns ns its ns ns ns ns ns ns ns ns ns dry nm no comment <br /> Notes <br /> TPHg-total petroleum hydrocarbons as gasoline The seven oxygenated fuel additive compounds by EPA Method 82608 µg/L= micrograms per liter=parts per billion(ppb) <br /> B=benzene MTBE=methyl tertiary butyl ether TBA=tertiary butyl alcohol GW=Groundwater <br /> T=toluene DIPS=dt isopropyl ether Meth =methanol TOC=Top Of Casing <br /> E=ethyibenzene ETRE=ethyl tertiary butyl ether Eth =ethanol na=not analyzed <br /> X=xylenes TAME=tertiary amyl methyl ether Depths and Elevations recorded in feet <br /> FP=free phase product <br /> gggmtbl 641 Page 3 of 3 HORIZON ENVIRONMENTAL INC <br />