The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. 1. REPORT DATE (DD-MM-YYYY)2. REPORT TYPE 3. DATES COVERED (From -To) 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER Table 5.1 Summary of the effect of ethane concentration on the percent reduction ratio for microcosms in Site #8, Set I (M8-I), Site #9 (M9) and the enrichment from Site #9 (E9). Grey lines represent abiotic medium controls to account for gas loss during sampling Figure 6.4 16S rRNA gene tree of aerobic VC oxidizing isolates. Sequence HF26 (■) was obtained from the isolated microaerobic VC oxidizing organism, whereas HF13 and HF19 are sequences from the groundwater microcosm clone library. JS sequences are known VC or ethene oxidizers. Strain JS614, a Nocardioides spp., was used as an outgroup in rooting the tree (Coleman et al., 2003). AUTHOR(S) PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)12 LIST OF TABLES LIST OF FIGURES