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I TABLE 1 j GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Stroot,Stockton,California ethyl- total Depth to TOC GW well TPHg benzene toluene benzene xylenes MTBE DIPS ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date jug/L) (uglL) (uglL) (uglL) (uglL) 1(ugll-) (uglL) (uglL) (uglL) (uglL) (uglL) (uglL) (uglL) uglL (feet) (feet msl) (feet msl) Comments VW-5 03103!00 ns as as as no as ns no no ns no ns ns ns nm nm am dry screened 06122100 ns ns ns no no no ns no no no no ns ns ns nm nm dry interval 09128!00 no ns no ns no. as ns ns no ns no ns ns as nm nm dry 37-47 12/29100 ns no as as as as ns as no ns ns no ns no. nm am dry 0328101 no as ns as as ns as as ns ns as ns ns as nm nm dry 0627101 no. ns no. ns as as no no no ns no no as no nm am dry 09AMI no ns no ns as as no no ns ns as ns ns no. nm nm dry VW4 03103100 as ns no no as as as as no ns no as no no nm nm nm dry screened 06/22100 ns ns ns ns as as no as ns ns as no ns no nm nm dry interval 0928!'00 ns ns ns na ns ns ns ns ns ns ns ns no ns nm nm dry 23-33` 1222100 no ns ns ns ns ns ns ns no ns ns ns no na nm nm dry 0328101 no as no as no. ns ns no no ns as ns no as nm am dry 0627101 ns ns no. ns as no ns as no ns ns as ns no nm am dry 08106!01 n$ no. as as ns as no as no no ns as ns no. nm nm dry VW-7 03103/00 ns no ns no as no ns as no ns as as as as nm nm nm dry screened 08122100 ns ns as no. ns no ns no no ns no ns no no nm nm dry Interval 09211MO ns no ns ns no ns no. ns no ns no as as no nm nm dry 371T 12/22100 ns ns ns ns ns no no ns ns ns ns no ns ns am nm dry 0328101 ns ns ns ns ns as as ns ns ns ns as ns n9 nm nm dry 0827101 no ns no as no ns no. no; as ns ns no as no. nm am dry 09106101 as ns as ns no no. as as ns no no as ns no am nm dry N01211: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethmm <=less than indicated reporting limit MTBE=metttyl-tert-butyl ether EDB=1.2-dibromoeetane ns=not sampled DtPE a diisWropyl ether GW=groundwater nm=not measured ETRE=ethyl-tart-butyl ether TOC=top of rasing TAME=tart-amyWmythyl ether msl=mean sea level TBA=ted-butanol 4749m00.Ws Page 6 of 6 HORIZON ENVIRONJUSTAL INC. Prosed No,1474 u