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Table 1-Groundwater Monitoring Data Beacon Station No.474 11 3443 East Main Street,Stockton,California �L l Well Date Mg. B T E X MTBE DIPE ETRE TAME TBA Meth Efh Dem to TOC GW Nuatlber YA WL ESIL uWL WA a GW Elevation Elevation Comments MW-8 03/31/98 100 : <D.50 <0.50 m.50 <0.50 <5.0 na na na na na na 61.51 25.68 -35.83 reported as MW-3A screen 06/10/98 80 0.9 <0.50 IC50 <0.50 <5.0 na na na na na na 58.86 -33.18 reported as MW-3A tWerval 09/0$198 79 0.57 <0,50 <0.50 <0.50 <0.50 <0.50 m.50 <0.50 <5.0 <50 <5.0 58.97 -33.29 slight odor/no sheen 56'-76' 12/30/98 51 2.4 0.69 <0.50 <0.50 <5.0 na na na na na na 57.13 -31.45 slight odor/no sheen 03/25/99 <50 <0.50 <0.50 40.50 <0.50 40.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.09 -29.41 no comment MW-9 03/31/98 <50 <0.50 x0.50 <0.50 <0.50 G5.0 na na na na na na 62.59 26.58 -36.01 reported as MW-1A screen 06/10/'98 66 <030 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.91 -33.33 reported as MW-1A interval 09/08/98 <50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.99 -33.41 no odor/no sheen 56'-76' 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na 59.0I -3I.43 no odor/no sheen 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 56.02 -29.44 no oomment VW 1 09/08/98 170,000 36,000 47,000 3,300 24,000 0.7 <D.50 <0.50 <0.50 <5.0 61.0 6.8 58.88 NM ncstrong odor/no sheen screen 12/30/98 190,000 34,000 49,000 3,300 24,000 <I000 na na na na na na 57.10 no PetroL odor/no sheen 50'-65' 03/25/99 260,000. 37,000 55,000 4,800 32,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.05 no no cocmnent 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 no strong odor/na sheen screen 12/30/98 79,000 29,000 1,600 3,700 16,000 <100 na na na na na na 57.28 no PetroLodor/no sheen 50-65' 03/25/999 89,000 14,000 2,700 3,200 13,000 <5.0 1 <5.0 <5.0 1 <5.0 <50 1 <500 <50 55.23 no no comment Notes: TPHg=total petroleum hydrocarbons as gasoline MTBE=methyl tertiary-butyl ether µg11,- micrograms per liter=parts per billion(ppb) B=benzene DIPE=di-isopropyl ether na=not analyzed GW=Groundwater T=toluene ETBE=ethyl tertiary butyl ether ns=not sampled TOC=Top Of Casing E=ethylbenzene TAME=tertiary amyl methyl ether nm=not measured X=xylenes TBA=tertiary butyl alcohol NM=Not Measured Depths and Elevations recorded in feet j Meth.-methanol no=not calculated Eth.=ethanol I u n I � i { .r 990MTeble.01 Page 2 of 2 HORIZON ENVIRONMENTAL INC. I I I;