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Tabu <br /> Groundwater Monitoring Data <br /> Beacon Station No 419 <br /> Stockton, California <br /> Well Date MTBE DIPE ETRE TAME TBA Methanol Ethanol EDC EDB comments <br /> Number ug/L ug/l, ug/L ug/L uglL ug/L ug/L ug/L ug/L <br /> MW-1 03/31/98 <5 0 no no no no no no na no <br /> (screened 06/10/98 <5 0 no na no no na na no na <br /> interval= 09/08/98 <0 50 <0 50 <0 50 <0 50 17 <50 <5 0 no na no odor/no sheen <br /> 65'.85) 12/30/98 <5 0 no na no no no no no no no odor/no sheen <br /> 03/26/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <10 no na no odor/no sheen <br /> 06/02/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 78 <0 50 no odor/no sheen <br /> 08/31/99 <0 50 <0 50 <0 50 <0 50 16 <50 <5 0 130 <0 50 no comment <br /> 12/09/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 59 <0 50 no comment <br /> AM-2 03/31/98 <5 0 no no no no na no na no <br /> (screened 06/10/98 <5 0 no no na no no no no no <br /> interval= 09/08/98 <0 50 <0 50 <0 50 <0 50 24 <50 <5 0 no no no odor/no sheen <br /> 651-851) 12/30/98 <5 0 no no no no no na no no no odor I no sheen <br /> 03/26/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na no no odor/no sheen <br /> 06/02/99 <0 50 <0 50 <0 50 <0 50 97 <50 <5 0 160 <0 50 no odor/no sheen <br /> 08/31/99 <0 50 <0 50 <0 50 <0 50 74 <50 <5 0 65 <0 50 no comment <br /> 12/09/99 15 <0 50 <0 50 <0 50 <5 0 <50 <5 0 42 <0 50 no comment <br /> MW-3 03/31/98 <5 0 no na na no na no no no <br /> (screened 06/10/98 <5 0 no na no no no no na no <br /> interval= 09/08/98 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no Petroleum odor/no sheen <br /> 651-851) 12/30/98 <5 0 no no no na no no no no slight odor/no sheen <br /> 03/26/99 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 na no slight odor/no sheen <br /> 06/02/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 31 <0 50 slight odor/no sheen <br /> 08/31/99 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 48 <0 50 no comment <br /> 12/09/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 12 <0 50 no comment <br /> MW4 03/31/98 <5 0 na no na no no na no no <br /> (screened 06/10/98 <5 0 no na no no no na no na no odor/no sheen <br /> interval= 09/08/98 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no no odor/no sheen <br /> 48'-70) 12/30/98 <5 0 na no no no no na na no no odor/no sheen <br /> 03/26/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na no odor/no sheen <br /> 06/02/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 32 <0 50 no odor/no sheen <br /> 08/31/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 43 <0 50 no comment <br /> 12/09/99 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 49 <0 50 no comment <br /> A <br /> 990Mtable 04 Page 1 of 2 HORIZON ENVIRONMENTAL INC <br /> I <br />