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N I • • i TABLE 1 , GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California We11 TPH=benzene eth benzene Depth to TOC GW yl xyleRii�� ETBE TAME TBA =methanollB GW Elevation Elevation Number Date u 11 u A u u A u 11 u A ll feet feet msl feet msl Comments VW-8 03125!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns d nm dry Interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 22 32' 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/01100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry rim dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/14100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm ry 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dryry 03/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm d 06/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns d ry 09/27/01 ns ns ns ns ns ns ns Its ns ns ns ns ns ns dry nm dry 12/13/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/28/02 ns ns ns ns ns ns ns ns ns ns ns ns ns __ns dry nm dry 06/19/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/26/02 ns ns ns ns ns ns ns ns ns ns ns ns ns n$ dry nm dry 03/26/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/27/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry dry nm dry Notes TPHg=total petroleum hydrocarbons as 1,asolme pgA=micrograms per Iver(pans per billion or ppb) MTBE—methyl ten butyl ether OW=broundwater RIPE—dusopropyl ether TOC—tap ofcasmg ETBE—ethyl ten butyl ether na—not analyzed TAME=ten amyl methyl ether FP=free product TBA—ten butyt alcohol 641gmr Project No 164146 Page 9 of 9 HORIZON ENVIRONI!n=AL INC