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i 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 DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number[ Date (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) 1(ug1L)1(ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L)(ug1L (feet) (feet msI) (feet msl) Comments VW-5 03/03/00 ns I ns ns ns ns ns ns ns ns ns ns ns ns ns d screened 0612211)0 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm nm ry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 3747' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03128/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06!27101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09106/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm 12104101 ns ns ns ns ns ns ns ns ns ns dry ns ns ns ns nm nm dry 03/01/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 05/20/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm dry VW-6 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns --iii--ns 1 nm nm nm screened 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm dry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12/22/10 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28101 ns ns ns ns ns nsn ns ns ns ns ns ns ns ns nm m dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12104/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01102 ns ns ns nm dry ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05120/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-7 03/03/00 ns ns ns ns ns ns ns ns ns IS ns ns --Ts- ns nm nm nm screened 06!22100 ns ns ns ns ns dry ns ns ns ns ns ns ns Interval 09/28/00 ns ns ns nm dry ns ns ns ns ns nm ns ns ns ns ns ns ns ns nm nm dry 3747' 12122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns ns -ns ns ns ns ns ns ns ns ns n$ ns nm nm dry 06127/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns AS nm nm dry 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05120/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry i nm dry Notes: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichtoroethane <=less than indicated reporting limit MTBE=methyl-tert-butyl ether EDB=1,2-dibromoethane ns=not sampled DIPE=diisopropyl ether GW=groundwater nm=not measured FTSE=ethyl-tert-butyl ether TOC=top of casing TAME=tert-amyl-methyl ether msl=mean sea level TBA=fart-butanol I I i 474gnu90.xla Prujed No.1474.44 Page 8 of 8 HORIZON ENVIRONMENTAL INC.