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i i • TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 F Hammer Lane,Stockton,California Depth to TOC GW Weil TPHg benzene toluene ethoenzene xylenes MTBE DfPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feel mst) (feet msl) Comments VW-8 03/25/99 ns ns ns as ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02199 ns Its ns ns ns ns ns ns ns ns as ns ns ns nm nm dry interval 08131/99 ns ns as ns ns ns ns ns ns ns ns ns ns ns nm nm dry 22 32 12!09199 ns ns ns ns ns ns ns ns ns as ns ns ns ns nm nm dry 03101100 ns ns Its ns ns ns ns ns ns as ns ns ns ns nm nm dry 06106100 ns as as ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/14/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/12100 ns ns ns ns ns ns ns ns ns ns ns as ns ns am nm dry 03/19/01 ns ns ns ns ns ns ns as ns ns ns ns as ns nm nm dry 06119/01 ns ns ns ns ns ns its ns ns Its ns as ns ns am nm dry 09/271DI 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 03!28102 ns ns AS ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06119!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09116102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12126!02 ns ns ns ns ns ns ns ns ns ns ns ns ns Its nm nm dry 03126/03 ns as ns ns ns ns ns ns ns ITS ns ns ns as nm nm dry 06127103 ns ns its AS ns as ns ns ns its ns ns ns ns nm nm dry 09119103 ns ns ns ns ns ns ns ns ns ns ns ns ns as nm nm dry Notes TPHb-total petroleum hydrocarbons as gasoline µg11=micrograms per later(parts per billion or ppb) MTBE=methyl t butyl ether GW=groundwater DIPS=dnsoptapyl ether TOC=tap or casing ETBE-ethyl t butyl ether na=not analyzed TAME-ten butanol nm=not measured TBA-ten butyl alcohol FP-free product 641 qmr ads Proted No 1641 46 Page 9 of 9 HORIZON ENVIRONMENTAL INC