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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOCGW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/1) (ug11) --Lug/1) (ug11) (ug/1) (ug/1) /(ugll) ugll) (ug1l) (ugll) (u (ugA) (ug11) (ug/1) (feet) (feet msl) (feet msl) Comments Vw-8 03125/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 22'-32' 12109/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/06/00 ns ns ns ns ns ns n$ ns ns ns ns ns ns ns nm nm dry 09114/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12113/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03128/02 ns ns ns ns ns ns ns ns ns ns ns ns ns n$ nm nm dry 06119/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/26/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/26/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06!27103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09119103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/26/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/17/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Notes: TPHg=total petroleum hydrocarbons as gasoline g fill=micrograms per liter(parts per billion or ppb) MTJ3E=methyl-t-butyl ether GW=groundwater DfPE=diisopropyl ether TOC=top of rasing ETBE=ethyl-t-butyl ether na=not analyzed TAME=ten-butanol rum=not measured TBA=ten-butyl alcohol FP=free product DCA=1,2-dichloroethane J=biased slightly high,see analytical report EDB=42-dibmmoethane 1141 gmrids Project No.5611.47 Page 11 of 11 HORIZON ENVIRONMENTAL INC.