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TABLE 7 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- totalDepth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (u !L (u !L) ((u/L u !L (u 1L u 1L u 1L u !L u !L u 1L (u !L u 1L u !L u 1L feet feet msl feet msl Comments Veenetl 06122!00 n 03103100 as as as as as as as as as as as ns as ns nm nm am dry screens as ns ns ns as as as ns as as as as as nm Interval 09/28100 as as as as ns as as as as ns as as ns as nm nm dry 37-47' 12122100 ns ns as as as as ns ns as ns as as ns ns nm nm dry 03128/01 ns as as ns as as as as as as as as as as nm am dry 06!27/71 as as nm dry ' ns ns ns as ns ns as as as as ns as nm nm dry 09/06/01 ns as ns ns as as as as ns ns as as as ns nm nm d 12/04101 as as ns ns as as as ns as as as as as as nm ry 03101102 as as as ns as nm dry as ns as as ns ns as ns ns nm nm dry O5/2P102 as as ns as as ns ns as ns as as as ns as nm nm dry VW-6 03/03100 as as as ns as ns as ns ns as as ns ns as nm screened 0622100 ns as as ns ns as as ns ns ns ns as n5 as nm nm nm dry interval 09/28/00 ns as as ns as as ns as as ns as ns as as nm nm dry .23.33' 12122/00 ns ns as ns ns ns as ns as as ns as as as am am dry 03128!01 as nm dry � as as as ns as as as as as ns ns as as nm nm dry OWN01 ns ns as as as as as ns ns as as ns as as nm 09106!01 ns as as as ns ns as ns ns ns ns ns n ns nm nm dry 12104101 ns ns as ns as as as as ns as as as as as nm am dry 03101/02 ns as ns ns as ns as as as as ns as as as am nm dry 05120!02 as ns ns ns ns ns as as as as ns ns as as nm nm dry nm dry VW-7 03!03!00 ns ns as as as ns as as as ns ns ns ns as nm nm nm dry screened 06/22100 ns as as ns ns n$ ns ns ns ns as as ns as nm Interval 09128100 as am dry as as ns as as as as as as as as as as nm nm dry ' 3747' 12122!00 as as as ns n$ as as as as as ns as as as nm 03128/01 ns as ns as ns ns ns as as as ns as as .ns nm dry 06!27/01 ns as as as as as ns ns ns ns as nm ns as ns nm nm dry 09/06/01 ns as as ns as as as as as as as as AS ns nm nm dry _ 12104101 as as as as as as as as as as as ns as as nm am dry 03!01102 ns ns as ns as as as as as as ns ns as as am nm dry 05!20102 ns as as as as as 1. ns as as as as as as ns nm nm dry nm dry Notes: TPHg=101al petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane <=less than indlcaled reporting limit MTBE=methyi-tert-butyl ether EPB=1,2-dibromoelhane ns=not sampled RIPE=diisopropyl ether GW=groundwater nm=not measured ETRE=ethyl-left-butyl ether TOC=top of casing TAME=tort-amyl-methyl ether msl=mean sea level TBA=leri-butanol i I I I 4 74gmi00 4, Project No 1474 44 Page 7 of 7 HORIZON ENVIRONMENTAL INC.