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Table 1 -Groundwater Monitoring Data <br /> Beacon Station No.474 <br /> 3443 East Main Street,Stockton,California <br /> Well Date TPHg B T E X MTBE RIPE ETBE TAME TBA Meth. Eth. Depth to TOC GW <br /> Number ug/L ug/L ug/L ug/L u ug/L ug/L ug/L ug/L ug/L ug/L ug/L GW Elevation Elevation Comments <br /> VWrI 09/08/98 170,000 36,000 47,000 3,300 24,000 0.7 <0.50 <0.50 <0.50 <5.0 61.0 6.8 58.88 NM nc strong odor I no sheen <br /> 12/30/98 190,000 34,000 49,000 3,300 24,000 <1000 na na na na na na 57.10 nc Petrol,odor 1 no sheen <br /> VW4., 09/08/98 86,000 19,000 6,900 3,100 20,000 1.4 <0.50 <0.50 <0.50 <5.0 74,0 <5.0 59..10 NM nc strong odor/no sheen <br /> 12/30/98 1 79,000 1 29,000 1,600 3,700 16,0001 na na na na na na 57.28 nc PetroL oder l no sheen <br /> Notes: <br /> TPHg=total petroleum hydrocarbons as gasoline MTBE=methyl tertiary-butyl ether pg/L= micrograms per liter=parts per billion(ppb) <br /> B=benzene RIPE=di-isopropyl ether na=not analyzed GW=Groundwater <br /> T=toluene ETRE=ethyl tertiary butyl ether ns=not sampled TOC=Top Of Casing <br /> E=ethylbenzene TAME=tertiary amyl methyl ether nm=not measured <br /> X=xylenes TBA=tertiary butyl alcohol NM=Not Measured Depths and Elevations recorded in feet <br /> Meth.=methanol nc=not calculated <br /> Eth.—ethanol <br /> 98QM Table 1 (474QMTBL1.xls) Page 2 of 2 HORIZON ENVIRONMENTAL INC. <br />