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Ta • A Groundwater Monitoring Data Beacon Station No.474 3443 East Main Street,Stockton,California Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Number ug/L ug/L ug/L ug/L ug/L ug/1 ug/L ug/L ug/L Comments MW-9 03/31/98 <5.0 na na na na na na reported as MW-lA screen 06/10/98 <5.0 na na na na na na reported as MW-lA interval 09/08/98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 <5.0 no odor/no sheen 56'-76' 12/30/98 <0.50 na na na na na na no odor/no sheen 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <500 <5.0 no comment 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.3 <0.50 no comment 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.66 <0.50 no comment 12/10/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.81 <0.50 no comment VW-1 09/08/98 0.70 <0.50 <0.50 <0.50 <5.0 <5.0 6.8 strong odor/no sheen screen 12/30/98 <I000 na na na na na na Petrol.odor/no sheen interval 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 no comment 50'45' 06/03/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 140 520 no comment 08/30/99 <50 <50 <50 <50 <500 <5000 <500 160 620 no comment 12/10/99 <100 <100 <100 <100 <1000 <10000 <2000 160 590 no comment VW4 09/08/98 1.4 <0.50 <0.50 <0.50 <5.0 <5.0 <5.0 strong odor/no sheen screen 12/30/98 <100 na na na na na na Petrol.odor/no sheen interval: 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 no comment 56'45' 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 no comment 08/30/99 86 <20 <20 <20 <200 X2000 <200 850 64 no comment 12/10/99 <20 <20 <20 <20 <200 <10000 <200 710 42 no comment Notes: MTBE=methyl tertiary-butyl ether na=not analyzed DIPS=di-isopropyl ether ns=not sampled ETBE=ethyl tertiary butyl ether nm=not measured TAME=tertiary amyl methyl ether NM=Not Measured TBA=tertiary butyl alcohol nc=not calculated Meth.=methanol Eth.=ethanol 99QMtable.Q4 Page 3 of 3 HORIZON ENVIRONMENTAL INC.