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TABLE 1A <br /> Groundwater Monitoring Data <br /> Beacon Station No.419 <br /> Stockton,California <br /> Well MTBE DIPE ETBE TAME TBA Methanol Ethanol EDC EDB comments <br /> Number Date u L u L u L u L u L u L u 1L u L u /L <br /> MW-7 12/30/98 <5 0 na na na na na na na na no odor/no sheen <br /> (screened 03!260 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 na na no odor/no sheen <br /> interval= 06102/99 11 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 no odor/no sheen <br /> 41'-66) 08/31/99 12 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 no comment <br /> 12/09199 <br /> <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 no comment <br /> 02121100 <0 50 <0 50 --050 <0 50 84 <50 <5 0 96 <0 50 no odor/no sheen <br /> 05/18/00 <0 50 .4050 <0 50 <0 50 68 <50 <5 0 na na no odor 1 no sheen <br /> MW-8 12130!98 <5 0 na na na na na na na na no odor/no sheen <br /> (screened 03@6/99 51 <0 50 <0 50 <0 50 <5 0 <50 <10 na na no odor 1 no sheen <br /> interval= 06/02/99 29 <0 50 <0 50 <0 50 <5 0 <50 <5 0 86 <0 50 no odor 1 no sheen <br /> 41'-66') 08/31199 16 <0 50 <0 50 <0 50 <50 <50 <50 54 <0 50 no comment <br /> 12/09/99 14 <0 50 <0 50 <0 50 <5 0 <50 <5 0 60 <0 50 no comment <br /> 42121100 2 <0 50 <0 50 <0 50 <5 0 <50 <5 0 69 <0 50 no odor 1 no sheen <br /> 05/18/00 1 8 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na no odor/no sheen <br /> I <br /> MW-9 12/30/98 <25 0 na na na na na na na na slight odor 1 no sheen <br /> (screened 03/26/99 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na no odor/no sheen <br /> interval= 061020 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 no odor/no sheen <br /> 41'-66') 08131199 055 <0 50 <0 50 <0 50 9 3 <50 <5 0 4 2 <0 50 no comment <br /> 12/09/99 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 no comment <br /> 02121/00 055 <0 50 <0 50 <0 50 10 <50 88 9 5 <0 50 slight odor 1 no sheen <br /> 05118100 <0 50 <0 50 <0 50 <0 50 12 <50 <50 na na slight odor 1 no sheen <br /> MW-10 12/30/98 <5 0 na na na na na na na na no odor 1 no sheen <br /> (screened 03/26/99 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na no odor/no sheen <br /> interval= 06/02/99 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 no odor/no sheen <br /> 41'-66) 08131/99 <0 50 <0 50 <0 50 <0 50 93 <50 <50 65 <0 50 no comment <br /> 12109!99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 26 <0 50 no comment <br /> 02/21/00 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 no odor/no sheen <br /> 05/18/00 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na no odor 1 no sheen <br /> Page 3 of 4 <br /> 419gmr11002 xis HORIZON ENVIRONMENTAL INC <br /> 41941 <br />