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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u 1L u !L u IL u 1L u 1L u 1L u IL (u 1L u 1L u 1L u 1L u !L u 1L u 1L feet feet ms l feet msi Comments VW-5 03103100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nnn screened 06!22100 ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09128!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nns ns ns ns nm m nm dry 37-47' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns nm dry ns ns ns nm nm dry 8701 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 06127!01 ns ns ns ns ns ns ns ns ns ns ns nm dry 09106101 ns ns ns ns nm nm dry ns ns ns ns ns ns ns ns ns ns - 12l04101 ns ns ns ns ns ns ns ns ns ns nm dry 03/01102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm ns nm dry 05/20/02 ns ns ns ns ns ns nm nm dry ns ns ns ns ns ns ns ns ns ns ns nm nm dry _ - VW 1i 03!03!00 ns ,ns _ ns ns ns ns ns ns ns ns ns ns ns ns nm nm screened 06!22!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09128!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12122100 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!27701 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09!06101 ns ns ns ns ns ns ns r ns ns ns nm dry 12!04101 ns ns ns ns ns ns Ds ns ns ns ns ns ns ns nm nm dry 03!01102 ns ns ns ns ns ns ns ns ns ns ns nm dry 05120/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm dry VW-7 03103100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06!22!00 ns ns ns ns ns ns ns ns ns as ns ns ns ns nm dry interval 09/28100 ns ns ns ns ns ns ns ns ns ns ns nm dry 3747' 12122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nrn dry 03!28!01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06127101 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 nm nrn dry ns ns ns ns ns ns ns ns ns 12!04!01 ns ns ns ns ns ns nm nm dry PS ns ns ns ns ns ns ns ns ns ns nm 03701!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05!20!02 ns ns ns ns ns ns ns ns ns ns ns nm dry ns ns ns nm nm dry Notes: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane c— less than indicated reporting limit MTBE=methyl-tert-butyl ether — EDB=1,2-dibromoethane ns not sampled RIPE=diisopropyl ether GW groundwater ETRE=ethyl-tert-butyl ether g nm=not measured TOC=top of casing TAME=tert-amyl-methyl ether msl=mean sea level TBA=terf-butanol 474ci-00.xls Project No,1474.44 Page 6 of 8 HORIZON ENVIRONMLN'1'AL INC.