API 4761 : 2007

TECHNICAL PROTOCOL FOR EVALUATING THE NATURAL ATTENUATION OF MTBE

American Petroleum Institute

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1 INTRODUCTION
  1.1 Purpose and Objectives of Document
  1.2 Regulatory Status of MNA of MtBE
  1.3 Anticipating and Addressing Stakeholder Concerns
  1.4 MtBE Attenuation State-of-the-Science
      1.4.1 Physio-Chemical Mechanisms of MtBE Attenuation
      1.4.2 MtBE Biodegradation
2 DEVELOPING A NATURAL ATTENUATION EVALUATION STRATEGY
  2.1 Overview of MNA as a Remediation Tool
      2.1.1 Overview of Existing MNA Guidance
      2.1.2 Applicability of Site Characteristics to MNA
  2.2 Tiered Approach for Evaluating the Natural Attenuation of
      MtBE and Required Supporting Data
      2.2.1 Tier 1 - Evaluation of Plume Behavior
      2.2.2 Tier 2 - Geochemical Data
      2.2.3 Tier 3 - Supplemental Data
  2.3 An Integrated Approach for Utilizing the Three Tiers of
      Data
      2.3.1 Tier 1 Data are Adequate to Evaluate Natural
            Attenuation
      2.3.2 Tier 2 Data are Collected
      2.3.3 Tier 3 Data are Collected
      2.3.4 Site Characterization and Conceptual Model
            Development
      2.3.5 Sites That Have Adequate Site Characterization Data
      2.3.6 Sites That Do Not Have Adequate Site Characterization
            Data
  2.4 Mass Flux Estimates
3 SAMPLE COLLECTION AND ANALYSIS
  3.1 Sampling Location and Frequency
  3.2 Sample Preservation
  3.3 Laboratory Analytical Methods
      3.3.1 MtBE
      3.3.2 Breakdown Products of MtBE and Other Associated
            Chemicals
      3.3.3 Geochemical Data
      3.3.4 Compound Specific Stable Isotope Analyses
      3.3.5 Laboratory Microcosms
      3.3.6 Molecular Microbial Community Analysis
4 MtBE MNA DATA EVALUATION AND PRESENTATION
  4.1 Tiered Approach for Evaluating the Natural Attenuation of
      MtBE
  4.2 Tier 1 Data Analysis
      4.2.1 Hydrogeologic Evaluation
      4.2.2 Hydrogeologic Data Presentation
      4.2.3 Evaluation of Source Strength and Composition
      4.2.4 Techniques for Evaluating Plume Stability
  4.3 Tier 2 Data Analysis
      4.3.1 Biogeochemistry Evaluation
      4.3.2 Presentation of Spatial/Temporal Changes in
            Geochemical Parameters
  4.4 Tier 3 Data Analysis
      4.4.1 Compound Specific Isotope Analysis
      4.4.2 Microcosm Study Data
      4.4.3 Presentation of Microcosm Study Data
5 REFERENCES
APPENDIX A - BIODEGRADATION MECHANISMS
APPENDIX B - PHYSIOCHEMICAL ATTENUATION MECHANISMS
APPENDIX C - ESTIMATING MASS FLUX
APPENDIX D - FIELD DATA COLLECTION PROTOCOLS
APPENDIX E - DATA QUALITY ASSURANCE
APPENDIX F - EXAMPLE MANN-KENDALL ANALYSIS
APPENDIX G - EXAMPLE FIRST ORDER RATE CALCULATION
APPENDIX H - SUMMARY OF THE RESULTS OF TBA
             NAPL/AQUEOUS PARTITIONING EXPERIMENTS