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TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> ethyl- Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug/L) (ug/L) (uglL) (ug1L) (ug/L) (ug/L) (ug1L) (ug/L)! (feet) (feet sea level) (feet sea level) Comments <br /> VW-2 03/26/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry <br /> screened 06102!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm slight odor 1 no sheen <br /> interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 1 dry nm dry <br /> 15 -25 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 02/21/00 n$ ns ns n$ ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 05/18/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> AS-1 02/21/00 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen <br /> screened 05/18/00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odor/no sheen <br /> interval 09/26/00 54000 2600 5300 590 3200 <5 0 na na na na na na na na 4913 nm slight odor/no sheen <br /> 64-69' <br /> Notes TPHg=total petroleum hydrocarbons as gasoline TAME=tert-amyl methyl ether GW=groundwater pg/L.= micrograms per liter=parts per billion(ppb) <br /> MTBE=methyl-tert butyl ether TBA=tert-butanol TOC=top of casing nm=not measured <br /> DIPE=dttsopropyl ether EDC=ethylene dichloride <=less than indicated reporting limit na=not analyzed <br /> ETBE=ethyl-tert-butyl ether EDB=ethylenL dibromide ns=not sampled <br /> 419gmrOD As <br /> 141941 Page 6 of 6 HORIZON ENVIRONMENTAL.INC <br />