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S+ �ffif, <br /> Given this wide varietyof 'indigenous microorganisms found <br /> g 9 <br /> ubiquitously in soils, it seemed reasonable to put these <br /> ^t organisms to work to remediate gasoline contaminated <br /> groundwaters. This was, in fact, first demonstrated by <br /> i <br /> Litchfield and Clark in 1973 (16) who noted a <br /> correlation between :he numbers of bacteria in groundwater and <br /> the amount of petroleum products. These authors developed a <br /> medium for tr.sting for hydrocarbonociastic bacteria and <br /> identified many of the organisms listed in fable 1. Their work <br /> confirmed the studies of NcKee et al . on the Los Angeles River ; <br /> In 1975, Jamison et al . (8) reported the. biudgg'radation. of <br /> gasoline contaminating the water supply .of,4h arch Township, <br /> PR, Further details of the remediation fef rt w e .published in j <br /> 1976 (9) listing -,the'types of batter ved in the <br /> remediation and ,the effectivene: o� emoval of.the gasoline <br /> ( <br /> adsorbed.oito soil particles,� the in situ bioremediation ' <br /> technique. Laboratory :..co1�?t dies to demonstrate the <br /> effectiveness of chis t n e were pc-rfcrmed and reported as .. <br /> successful by Raymond et a (10) . Since then , numerous studies <br /> have been published in which they describe the effectiveness of <br /> using ISS. <br /> M people developed experience with IS8 they realized that <br /> ` ox$9en,;:in the form of air, was. limiting microbial activity. <br /> This. resulted iri: a series of studies by the Teras Research <br /> s ' <br /> . .. Institute (Tn1,' in 1982 and :aS5 (11, 12) in which they reported <br /> the effi+.acy of{using-hyd.rogen--peroxide-as the-sur agate Touygen <br /> source, Aerobic microorganisms contain :either peroxidase or <br /> -23- � <br /> 4 <br /> y <br /> �-� t�cksL.aTa• -nm.ww ,-.....,..��.F,..-:a<:x.::d':;.A.A ixir - ,..,.., ,.k .,.>_.3 ,.+<.._ ,,.._.. ,._......�,. ... ._..__ ,.,, <br /> 3. <br /> :t -:, <br /> S <br /> 5 <br /> C <br /> h - <br />