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To be presented at 1999 Petroleum Hydrocarbons Conference, Houston, Texa.. <br />1400 <br />1200 <br />1000 <br />800 <br />0 <br />Cd <br />r. <br />600 <br />U <br />C <br />O <br />U <br />400 <br />200 <br />0 <br />hexane - MtBE systems <br />i <br />- �- hexane - bg —o— MtBE - bg <br />a • • hexane - con --0— MtBE - con <br />hexane - sc 0 MtBE - sc <br />0 10 20 30 40 50 60 70 80 90 <br />elapsed time (days) <br />Figure 3. Concentration history of hexane and MTBE in sacrificed batch microcosms. bg <br />= background sediments, con = contaminated sediments, sc = sterilized controls. <br />0410I111 <br />2000 <br />1500 <br />0 <br />0 <br />w <br />1000 <br />0 <br />U <br />500 <br />0 <br />isopentane - MtBE systems <br />- isopentane - bg — 0 MtBE - bg <br />An- - isopentane - con —0 MtBE - con <br />- isopentane - sc —0— MtBE - sc <br />---------- y -_ =-------------■ <br />0 10 20 30 40 50 60 70 80 90 <br />elapsed time (days) <br />Figure 4. Concentration history of isopentane and MTBE in sacrificed batch microcosms. <br />bg = background sediments, con = contaminated sediments, sc = sterilized controls. <br />Page 6 <br />