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' r r � TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date jug/L) (uglL) (uglL) (uglL) (uglL) jug/L) jug/L) (uglL) (uglL) (uglL) (uglL) (ug1L) (uglL) uglL (feet) (feet msi) (feet msl) Comments VW-5 03/03/00 ns as ns ns ns ns as ns ns ns as ns ns as nm am nm dry screened 06/22100 ns as as ns ns ns ns ns ns ns ns ns ns as nm nm dry interval 09128M ns ns ns ns ns ns ns ns ns ns ns ns ns as nm nm dry 37-47' 12/22/00 ns ns as ns ns as ns ns ns ns ns ns as as nm am dry 03128MI ns ns ns ns ns ns as ns ns ns ns ns AS as nm nm dry 06/27/01 ns ns as ns ns ns ns ns ns as ns ns ns as nm nm dry 09/06/01 ns ns ns ns ns ns ns ns ns ns ns as as ns nm nm dry 12/04/01 as ns ns ns ns ns ns ns ns ns ns as as as nm nm dry VW-6 03/03/00 ns ns ns ns as ns ns ns ns ns ns ns as as am nm nm dry screened 06122100 ns as as as ns as as ns ns ns ns ns ns ns nm am dry interval 09/28/00 ns ns ns ns ns as ns ns ns as ns ns ns ns nm nm dry 2333' 12/22100 ns ns ns ns ns as ns ns ns as ns ns ns ns nm nm dry 03/28101 ns ns ns ns as ns ns ns ns as ns as ns ns nm nm dry 06127/01 ns ns ns ns as ns ns ns ns ns as ns ns ns nm nm dry 09/06/01 ns as ns ns ns ns ns as as ns ns ns ns as nm nm dry 12/04/01 ns as as as ns ns as ns ns ns ns as ns ns am nm dry VW-7 03103MG AS as AS as ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06122100 as ns as ns as ns ns ns ns ns ns ns as ns nm nm dry interval 09/26/00 ns ns ns ns as ns ns ns ns as ns ns ns ns nm nm dry 37-47' 12/22/00 ns ns ns as as ns ns ns ns ns ns ns as ns nm nm dry 03/28/01 as ns ns ns ns ns ns ns ns ns as ns ns as nm nm dry 06/27101 ns ns ns ns ns ns ns ns ns ns as ns ns ns nm nm dry 09106/01 ns as ns ns ns ns ns ns ns ns as ns ns ns nm nm dry 12104/01 as as ns ns ns ns as as ns ns ns ns ns ns am am dry I Ngte&: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane <=less than indicated reporting limit MTBE=methyl-tert-butyl ether EDB=1.2-dibromoethane ns=not sampled RIPE=diisopropyl ether GW=groundwater nm=not measured ETRE=ethyl-tert-butyl ether TOC=top of casing TAME=ten-amyl-methyl ether msl=mean sea level TBA=tert-butanol o- 4 PrL74,44 Page 7 of 7 HORIZON 6NVIROMMLNTAL INC. "Ct G NNo.t14