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Table Is Groundwater Monitoring Data Beacon Station No.474 3443 East Main Street,Stockton,California I Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Number ug/L ug/L ug/L ug/L ug/L ug/l ug/L ug/L ug/L Comments 09108/98 0.70 <0.50 <0.50 <0.50 <5.0 <5.0 6.8 strong odor/no sheen 12130/98 <1000 na no na na na na Petrol.odor/no sheen 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 no comment 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 03/03M <100 <I00 <100 <100 <1000 <20000 <1000 1,500 5,800 no odor/no sheen 03/03/00 Its ns ns ns ns ns ns ns ns Dry 03/03/00 ns as ns ns ns as ns ns ns Dry 09108198 1.4 <0.50 <0.50 <0.50 <5.0 <5.0 <5.0 strong odor/no sheen 12/30/98 <I00 na 1111 na na na na Petrol.odor 1 no sheen 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 no comment 06/03/99 <0 0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 no comment 08/30/99 86 <20 <20 <20 <200 0000 <200 850 64 no comment 12/10/59 <20 <20 <20 <20 <200 <10000 <200 710 42 no comment 03/03/00 ns as ns ns ns ns ns ns ns Dry 03/03/00 ns ns ns, ns ns ns ns ns ns Dry Bola, MISE-methyl tertiary-butyl ether na=not analyzed DIPE di-isopropyl ether ns=not sampled ETBE=ethyl tertiary butyl ether nm=not measured TAME a tertiary amyl methyl ether NM=Not Measured TBA=tertiary butyl alcohol nc=not calculated Meth.-nwilmnol EtIL Wmnol 990Mtable.04 Page 4 of 4 HORIZON ENVIRONMENTAL INC.