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r.. <br /> TABLE l <br /> GROUNDWATER MONITORING DATA <br /> Beacon Station No.474 <br /> 3440 East Main Street,Stockton,California <br /> I <br /> i <br /> ethyl- total Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (u L) (u IL) (u L) (u /L) (u /L) (u IL) (ug/L) (u IL) (u /L) (ug/L) (ug/L) (u IL) (uglL) (ug/L) (feet) (feet msl) (feet mst) Comments <br /> VW-2 03/03/00 ns ns Its Its Its Its Its Its ns Its nm Hs Its Its 11111 11111 dry <br /> VW-3 03/03/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns mn 11111 dry <br /> VW-4 09/08/98 86,000 19,000 b,900 3,100 20,000 IA <0.50 <0.50 <0.50 <5.0 740 <5.0 59.10 11111 11111 strong odor I nu sheen <br /> screened 12/30/98 79,000 29,000 1(,00 3,700 16,000 <100 Ila Ila na na Ila Ila 5729 Hn1 Petrol Will 111u sheen <br /> interval 03/25/99 89,000 14,000 2,700 3,200 13,000 <5.0 <5.0 <5 0 <5.0 <50 <500 <50 55.23 11111 no col11menI <br /> 50'-65' 06/03/99 39,000 10,000 1,600 2,900 11,000 <0 50 <0.50 <0 50 <0,50 <5.0 <50 <5.0 930 120 5444 11111 no C011111em <br /> 08/30/99 50,000 9,200 1,500 3,500 12,000 86 <20 <20 <20 <200 <2000 <200 850 64 5653 11111 nntolnmenl <br /> 12/10/99 64,000 9,300 2,200 2,800 9,700 QD <20 <20 <20 <200 <10000 <200 710 42 5661 111], Iu1 coHnncill <br /> 03/113/00 ns its us ns Hs ns Its its 11s ns ns us Its Its Hill nnl dry <br /> 06!22100 Its ns ns ns ns ns ns Its Its Its ns us Its Its 11111 nu, d1% <br /> VW-5 03!03/00 ns ns tts ns ns Its Its Its ns ns ns ns Its ns nn1 11111 do <br /> VW-6 03/03/00 Its Its ns ns ns ns its ns ns Its its ns ns 11s nm null dry <br /> VW-7 owwoj ns ns ns ns ns ns ns ns Its ns Its Its us its nm nm do <br /> Notes: TPlig=total petroleum hydrocarbons as gasoline EiDC= 1,2-dichtoroethane <—less than indicated reporting limit <br /> WBE=methyl ten-butyl ether EDB= 1,2-dibronlnethane its=not sampled <br /> DIPG=diisopropyl ether GW=groundwater nun—not measured <br /> li'fI3E=ethyl tort-butyl ether 'FOC=top of casrtlg <br /> 'rAME=tert-amyl methyl ether nisi=mean sea level <br /> !3A=tert-butanol <br /> 474gmr00.xls <br /> 147443 Page 4 of 4 HORIZON ENVIRONMENTAL INC. <br />