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• 16E1 <br /> GROUNDWATER MONITORING DATA <br /> Beacon Station No 12474 <br /> 3444 East Main Street,Stockton,California <br /> ethyl- total Depth to TOC GW <br /> Well TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation <br /> Number Date u IL (ug/L (ug/L (u/L u 1L (ug/L (ug/L (ug/L (ug/L (ug/L jug/L)( (ug/L (ug/L u 1L feet feet msi feet msl Comments <br /> VW-7 03/03/00 ns ns ns ns ns ns ns as ns as ns ns ns ns nm nm nm dry <br /> screened 06/22/00 ns ns ns ns ns ns ns as ns as as ns ns ns nm nm dry <br /> interval 09128/00 ns as ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 37.47' 12122/00 ns ns ns ns ns ns ns ns ns ns ns ns as ns nm <br /> nm dry <br /> 03!28101 ns ns as as ns ns ns as as ns ns ns as ns nm nm dry <br /> 06!27101 ns ns as as ns as ns ns ns ns as as ns ns nm nm dry <br /> 09/06/01 as ns as ns ns as ns ns ns as as ns ns ns nm nm dry <br /> 12/04101 ns ns ns ns as ns as as ns as ns ns ns ns nm nm dry <br /> 03101/02 ns ns ns ns ns ns as ns ns ns ns ns ns ns nm nm dry <br /> 05/20/02 ns ns ns ns ns ns ns as ns ns as ns as as nm nm dry <br /> 03107/03 ns ns ns ns ns ns ns as ns ns ns ns as as nm am dry <br /> 06/03/03 ns ns as ns as ns ns ns as ns ns ns as ns nm nm dry <br /> 08/28/03 as ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 11125103 as ns as as ns as ns ns ns ns as ns ns ns nm nm dry <br /> 03/01104 as as ns ns ns as ns ns ns as as ns ns ns nm 2589 nm dry <br /> 06/08/04 ns ns ns ns ns ns as ns as as ns ns ns ns am nm not sampled <br /> 09108/04 as ns ns ns ns ns as ns ns ns ns ns ns ns nm nm not sampled <br /> 12108/04 ns as ns ns as ns as as ns ns ns ns as ns am nm not sampled <br /> 03110/05 ns ns as as ns ns ns ns as ns ns ns ns ns nm nm not sampled <br /> 05/25/05 ns ns as as ns ns ns ns ns ns ns ns ns as nm nm not sampled <br /> 09/01/05 ns ns ns as ns ns ns ns as as as as ns as nm nm not sampled <br /> Notes TPH9=total petroleum hydrocarbons as gasoline DCA=1 2-dichloroethane <=less than indicated reporting limit <br /> MTBE=methyl-tert-butyl ether ED3=1,2tLbmmoethane ns=not sampled <br /> DIPE=diisopropyl ether GW=groundwater nm=not measured <br /> ETRE=ethyl-ten butyl ether TOC=top of casing nc=not calculated <br /> TAME=tert-amyl-methyl ether msl=mean sea level `=does not exhibit a typical chromatographic pattern <br /> TBA=tort butanol <br /> I <br /> i <br /> I <br /> 474gmf05 xis <br /> Protect No 1474 48 Page 18 of 18 HORIZON E"MONMENTAL INC <br />