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TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Deptlt to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol ED, EDB GW Elevation Elevation Number Date NO) {ugA) (ug/1) {ugll) (uglq (ug/l) {ugll) (ugll) (Ug/1) (uglf) (ug/1) (ug/1) (ug)) (ugll) (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 nm dry screened 06/02199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry 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 12109!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03101!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09114!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03119!01 ns ns ns ns ns ns ns ns P$ ns ns ns ns ns dry nm dry 06/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/27/01 ns ns ns ns ns ns ns ns 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 AS ns ns ns dry nm dry 06!19102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/16/02 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 ns dry nm dry 03!26103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry Notes TPH6=total petroleum hydrocarbons as gasoline p&4=micrograms per liter(pans per billion or ppb) MTBF=methyl Cert buivl ether GW=groundwater PIPE-dusopropyl ether TOC=top of easing ETBE=ethyl ten butyl ether na-not analyzed TAME=tert amyl methyl ether FP=free product TBA=ten butyl alcohol I 641grrw xis Project No 1641 46 Page 9 of 9 HORIZON ENVIRONMENTAL INC