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 this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. 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 ADDRESS. REPORT DATE (DD-MM-YYYY) PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBERParsons Engineering Science, Inc. 1700 Broadway, Suite 900, Denver, CO SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) AFCEE SPONSOR/MONITOR'S REPORT NUMBER(S)Air Force Center for Environmental Excellence 3300 Sidney Brooks Brooks City-Base, TX 78235 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited SUPPLEMENTARY NOTES ABSTRACTThis slide presentation summarizes the approach to be followed when evaluating the natural attenuation of MTBE and other fuel oxygenate and considers the consequences of the unique physical and chemical characteristics and their resultant behavior in the environment. SUBJECT TERMS
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 this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) AFCEE SPONSOR/MONITOR'S REPORT NUMBER(S)Air Force Center for Environmental Excellence 3300 Sidney Brooks Brooks City-Base, TX 78235 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited SUPPLEMENTARY NOTES ABSTRACTThis report summarizes the results of natural attenuation treatability studies at 14 Air Force sites contaminated with chlorinated solvents and their associated biodegradation daughter products (chlorinated aliphatic hydrocarbons [CAHs]) or a mixture of solvents and other contaminants (principally fuels). The main emphasis of the work described in this report was to evaluate the potential for naturally occurring degradation mechanisms to reduce the concentrations of CAHs dissolved in groundwater to levels that are protective of human health and the environment, and to limit the migration of CAH plumes in groundwater. SUBJECT TERMSnatural attenuation, chlorinated solvents, CAHs, fuels, daughter products, biodegradation, dechlorination, remediation The main emphasis of the work described herein was to evaluate the potential for naturally occurring degradation mechanisms to reduce the concentrations of CAHs dissolved in groundwater to levels that are protective of human health and the environment, and to limit the migration of CAH plumes in groundwater. The TSs were not intended to be contamination assessment reports or remedial action plans; rather, they were designed to provide a scientific evaluation of natural attenuation that could be used by individual Air Force bases and their prime environmental contractor(s) for future remedial decision making. Specific objectives included:• Developing site characterization techniques to more accurately document in situ geochemistry and to maximize the quantity and quality of collected field data while reducing overall expenditures of money and time;• Providing a consistent framework for documenting historical contaminant reductions and geochemical patterns consistent with biodegradation, and determining rates of contaminant degradation;• Identifying those biological processes most responsible for contaminant attenuation in varied subsurface environments;• Using analytical or numerical groundwater flow and solute fate and transport models to predict the effects of natural attenuation, both alone and in combination with engineered remedial technologies, on the future migration and persistence of dissolved CAHs;• Evaluating strat...
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 this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. 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 ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) AFCEE SPONSOR/MONITOR'S REPORT NUMBER(S)Air Force Center for Environmental Excellence 3300 Sidney Brooks Brooks City-Base, TX 78235 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited SUPPLEMENTARY NOTES ABSTRACTThis update report presents the results of work completed to evaluate additional analytical data collected to augment the original fuels weathering study performed for AFCEE. The original report, "light Nonaqueous-Phase Liquid (LNAPL) Weathering at Various Fuel Release Sites" was completed Sep 1999. The existing data set from the original fuels weathering study was augmented with newly-collected data from several additional sites. The expanded data set was used to form a more robust database for estimating fuel LNAPL weathering rates.Both the original study and this update focus primarily on the weathering or natural depletion of BTEX components from free-phase product.
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