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TABLE 7 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 (uglL) (uglL) (ug/L) (uglL) (ug/L) (uglL) (ug/L) (uglL) (ugfL) (ug/L) (uglL) (uglL) (uglL) uglL (feet) (feet msl) (feet msl) Comments j VW-5 1 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry 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 37-47' 12122/00 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 ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-6 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 2333' 12!22100 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 ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry screened 03103100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 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 03/28/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 1 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 DIPE=diisopropyl ether GW=groundwater nm not measured ETRE=ethyl-tert-butyl ether TOC=top of casing TAME=tert-amyl-methyl ether msl=mean sea level THA=tert-butanol I I I f • 474gmrOO kts Project No.1474.4a Page 6 of 6 HORIZON LNVa20N>b$N7'AL INC.