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33 <br /> f/ <br /> presence in groundwater above background at a petroleum hydrocarbon groundwater plume is <br /> strongly indicative of microbial degradation of fuel hydrocarbons Concentrations of CH4 at <br /> the Site are summarized in Table 4 of Appendix E Dissolved methane was detected in <br /> ' samples collected from monitoring wells MW-2 and MW-10 All other samples were <br /> nondetect for dissolved methane The methane data indicates that strong reducing conditions <br /> ' exist in the vicinity of MW-2 and MW-10 and that microbial biodegradation of the plume is <br /> occurring <br /> 1 <br /> 1 <br />