Expertise

Mr. Barden is a senior hydrogeologist and has over 30 years of experience as a geologist, environmental consultant and state regulator. He has dealt extensively with hydrogeological evaluation, contaminant transport and fate evaluation, and soil and groundwater modeling, and water supply and water resources projects, and has expertise in risk assessment and the environmental geochemistry and natural attenuation of organic and inorganic contaminants, including explosives and radionuclides. His expertise also includes the use of groundwater, soil, and geochemical models to support decision-making for site characterization and remediation. His experience includes project management, technical direction, characterization, evaluation and review of soil and groundwater conditions and remedial designs for commercial/industrial facilities, CERCLA, RCRA and UST sites and landfills involving chlorinated solvents, petroleum hydrocarbons, metals and radionuclides. Mr. Barden was formerly a senior hydrogeologist with the Wisconsin Department of Natural Resources where he was instrumental in developing regulations and guidance governing investigation and cleanup of contaminated sites. He was a member of a National Academy of Science committee that evaluated the scientific basis for natural attenuation as a remedy, and has been an instructor for numerous training courses on monitored natural attenuation, risk assessment, and modeling for professional organizations and state regulatory agencies. He was formerly an adjunct assistant professor in the University of New Mexico Graduate Toxicology Program for risk assessment and regulatory toxicology.


Education

-B.S. (Geology and Geophysics) University of Wisconsin, Madison. 1982.
-M.S. Program (Geology) Vanderbilt University, Nashville, Tennessee. 1983-1985.

Registrations/Certifications

OSHA 40-Hr HAZWOPER Training, 2013
OSHA 24-Hr HAZWOPER Training for UST Workers, 1991

Representative Experience

• Project manager for site characterization and remediation of LUST site in South Tucson, Arizona. Oversight and technical direction of site characterization, field sampling activities and interpretation of data. Directed and evaluated LNAPL transmissivity testing to evaluate free product recovery. Directed and evaluated soil vapor extraction (SVE) pilot tests. Direction and oversight of design, permitting and installation of SVE and air sparge remediation system and system operation and maintenance.

• Planned and directed soil vapor sampling for vapor encroachment assessment at properties in south Tucson to support Brownfields assessment. Evaluated soil vapor data and performed screening evaluation consistent with ASTM 6200-15.

• Technical direction for evaluation of fluoride-impacted public water supply well in San Simon, Arizona to determine source zones. Developed depth-specific sampling approach.

• Technical direction and project management for remediation and risk-based closure of LUST site near Yuma, Arizona. Oversight and technical direction of site characterization, field sampling activities and interpretation of data for evaluation of natural attenuation and vapor intrusion. Developed conceptual site model, performed data evaluation and interpretation, evaluated contaminant transport and fate, and conducted risk assessment. Performed focused feasibility evaluation of potential remediation alternatives. Performed a Tier 3 risk assessment, prepared documentation and obtained regulatory closure.

• Technical direction and support of hydrogeological investigation for uranium mine in northern Arizona. Provided hydrogeological interpretation and evaluation of groundwater geochemistry and age for seepage water entering the mine shaft. Directed sampling for geochemical parameters, stable isotopes, and multiple dating techniques including chlorofluorocarbons (CFCs), sulfur hexafluoride (SF6), tritium/helium-3 (3H/3He), and radiocarbon (14C) in dissolved inorganic carbon, and interpreted results.

• Expert peer review panel for Rainier Mesa/Shoshone Mountain Corrective Action Unit 99 Underground Test Area Activity, Nevada National Security Site. Review of the groundwater flow and transport model for radionuclides and supporting documentation to determine whether the model, results, interpretations, and documentation are adequate to support risk mitigation decisions. Work included extensive review of area geology and hydrogeology to evaluate groundwater flow and potential contaminant transport pathways across multiple groundwater basins.

• Providing technical direction and support for remedial investigation of Highway 260 and Main WQARF site in Cottonwood, Arizona, involving PCE contamination from multiple sources in a complex alluvial and fractured bedrock aquifer system. Project planning and technical direction for soil and groundwater investigation, including development of sampling plans and quality assurance documents. Technical direction of soil vapor sampling for vapor intrusion assessment and confirmatory indoor air sampling and HVAC evaluation to refine risks.

• Project manager for installation of two new public water supply wells on the San Xavier District south of Tucson for the Tohono O’odham Utility Authority and conducting an aquifer pumping test (step-test) on the wells to evaluate water production and well capacity. Conducted “new source” sampling and data evaluation under the Safe Drinking Water Act.

• Project manager for site characterization and remediation of LUST site in Green Valley, Arizona. Provided oversight and technical direction of site characterization and field sampling activities, including soil vapor sampling, and interpretation of data. Developed conceptual site model, performed data evaluation and interpretation, evaluated contaminant transport and fate, and conducted risk assessment, including vapor intrusion. Oversight of soil vapor extraction (SVE) system installation, operation and maintenance. Analyzed SVE operational data to evaluate mass removal and concentration reduction. Performed a Tier 3 risk assessment, prepared documentation and obtained regulatory closure.

• Technical direction and support for investigation and remediation of lead and other metals contamination at 3rd Ave & Smelter Ave Site in Patagonia, Arizona associated with historical smelting activities. Developed sampling and analysis plan for field investigation work that included extensive x-ray fluorescence readings, and soil and groundwater sample collection and analysis. Provided technical support and risk evaluation for early response actions to remove metals-contaminated soil from residential properties and eliminate dust inhalation hazards.

• Project manager and technical director for evaluation of contamination and compliance alternatives of nitrate-impacted public water supply wells on the Tohono O’odham Nation. Planned and directed investigation and sampling activities; performed and directed hydrogeological and hydrogeochemical evaluation of nitrate in the aquifer, including use of stable isotopes to identify nitrate sources; determined locations for potential new water supply wells; coordinated and directed evaluation of nitrate treatment alternatives and alternative water sources.

• Providing technical direction and support for remedial investigation of Miller Valley & Hillside WQARF site in Prescott, Arizona, involving PCE contamination from multiple sources in a complex alluvial and fractured bedrock aquifer system. Project planning and technical direction for soil and groundwater investigation, including development of sampling plans and quality assurance documents. Technical direction of soil vapor sampling for vapor intrusion assessment and confirmatory indoor air sampling to refine risks.

• Project manager for underground storage tank (UST) closure activities at 16 sites across Arizona, including UST removals and in-place closures. Provided oversight and coordination for managing various subcontractors, permitting, regulatory interaction, conducting UST closure investigation soil sampling, evaluation of laboratory analytical results and completion of ADEQ UST Closure Reports. Additional limited investigation was conducted at several selected sites during the UST closure investigation activities where warranted.

• Technical direction and support for investigation and remediation of Harrison & Millmar Dross WQARF Site in Tucson, Arizona involving metals contamination from past aluminum dross waste disposal activities. Developed sampling and analysis plan for field investigation work that included extensive x-ray fluorescence readings, and soil and groundwater sample collection and analysis. Evaluated contaminant transport and site-related health risks to residents. Provided technical support and risk evaluation for early response actions to remove metals-contaminated soil from residential properties and eliminate dust inhalation hazards.

• Project manager for abandonment of 9 water supply and monitoring wells at abandoned mine site near Bullhead City, AZ for the federal Bureau of Land Management (BLM). Researched ownership and executed transfer to BLM. The work involved coordination with the Arizona Department of Water Resources (ADWR) on well identifications, appropriate abandonment methods, permitting and reporting. Provided oversight of drilling subcontractor during well abandonment work. Provided documentation and reporting.

• Project manager and technical director for evaluation of contamination and compliance alternatives of uranium-impacted public water supply wells in the Tucson, Arizona area. Planned and directed investigation and sampling activities; performed and directed hydrogeological and hydrogeochemical evaluation of uranium mobilization in the aquifer; determined locations for potential new water supply wells; coordinated and directed evaluation of uranium treatment alternatives.

• Expert review and evaluation of petroleum contamination impacting residential water supply wells in a complex fractured bedrock and karstic multi-aquifer setting in southwest Missouri. Provided hydrogeological interpretation and evaluation of contaminant transport. Developed direction for further site characterization and provided appropriate methods for sampling, including soil vapor sampling.

• Senior Hydrogeologist directing hydrogeological and hydrogeochemical characterization for planned deep underground mine and Aquifer Protection Permit application, including determining appropriate monitoring well locations and design; designing aquifer testing approach for mine dewatering and aquifer characterization; and geochemical evaluation of rock-water interactions.

• Project manager for assessment of site conditions, landfill gas composition, distribution and generation, and surface soil properties to support evaluation of proposed redevelopment alternatives for the closed A-Mountain landfill in Tucson, Arizona. Directed placement and installation of multi-level landfill gas probes for landfill gas measurements. Gas pressure measurements were used to evaluate landfill cover soil gas permeability and landfill gas generation rates using numerical modeling.

• Technical support and oversight for site characterization and oil spill modeling to support development of spill prevention, control & countermeasures (SPCC) plans for electrical substations.

• Technical support on hydrogeological and hydrogeochemical evaluation and interpretation for a uranium mill site in southeastern Utah. Site involves nitrate and chloroform solute plumes in sedimentary bedrock aquifer.

• Senior hydrogeologist for remedial investigation of soil and groundwater contamination by chlorinated solvents and hexavalent chromium at West Central Phoenix-North Canal Plume WQARF site in Phoenix, Arizona involving multiple sources and multiple and overlapping groundwater solute plumes. Designed geochemical sampling plan for evaluation of natural attenuation of contaminants and soil vapor sampling plan for vapor intrusion. Performed hydrogeological and geochemical evaluation of contaminant transport and fate, including metals. Performed human health risk assessment for soil vapor and groundwater impacts. Oversaw production of Remedial Investigation report.

• Technical support for Arizona Department of Environmental Quality oversight of TIAA Superfund site in Tucson, Arizona. Document review and critical evaluation for work plans, feasibility studies, models, performance evaluations of remediation systems and capture analysis. Provided critical evaluations of conceptual site models, hydrogeological conditions, and contaminant distribution and transport. Performed technical review of statistical evaluation for chromium background concentrations and quality assurance. Reviewed soil vapor intrusion investigation work plans and soil vapor intrusion risk evaluation reports. Provided support for development of USEPA’s Five Year Review document.

• Senior Hydrogeologist for remedial investigation/feasibility study of extensive chlorinated ethene solute plume and associated petroleum contamination at 7th and Arizona WQARF site in Tucson, Arizona. Interpreted contaminant and geochemical data and performed geochemical evaluation explaining distribution, transport and natural attenuation of chemicals of concern in the aquifer. Developed human health risk assessment for soil and groundwater contamination involving vapor transport and evaluated vapor intrusion. Wrote QAPP and Field Sampling Plan and produced standard operating procedures (SOPs) for sampling. Coauthored Remedial Investigation Report and Feasibility Study Report; participated in public meeting.

• Technical support for seven preliminary investigations conducted for the Arizona Department of Environmental Quality to support listing sites in the state Superfund program. Performed hydrogeological evaluations and developed sampling plans. Performed data evaluation and preliminary hazard assessments.

• Project manager for four petroleum storage tank sites in Winslow, Arizona. Providing oversight and technical direction of site characterization, field sampling activities and interpretation of data. Designing geochemical sampling plans and soil vapor sampling plans. Development of work plans and coordination and scheduling of field operations. Designing and overseeing remediation pilot studies, including in situ chemical oxidation (ISCO), and evaluating remediation options for soil and groundwater contamination. Developing conceptual site models, evaluating contaminant transport and fate, conducting risk evaluations including soil vapor intrusion assessments and evaluating remediation options. Designing remedial actions and directing remediation activities.

• Senior hydrogeologist for remedial investigation of soil and groundwater contamination for extensive chlorinated ethene solute plume impacting municipal wells at the Central & Camelback WQARF site in Phoenix, Arizona area. Performed hydrogeological and geochemical evaluation of contaminant transport and fate, including metals. Evaluated performance of groundwater pump-and-treat system and solute plume capture in source area. Performed human health risk assessment for soil, soil vapor and groundwater impacts. Oversaw production of Remedial Investigation report.

• Senior hydrogeologist for remedial investigation of soil and groundwater contamination for extensive chlorinated ethene solute plume impacting municipal wells at the Cooper & Commerce WQARF site in Phoenix, Arizona area. Performed hydrogeological and geochemical evaluation of contaminant transport and fate, including metals. Evaluated performance of groundwater pump-and-treat system and solute plume capture in source area. Performed human health risk assessment for soil, soil vapor and groundwater impacts. Oversaw production of Remedial Investigation report.

• Conducted a Phase I Environmental Site Assessment for a golf course and ancillary properties in southern Arizona. The assessment was completed under the US EPA All Appropriate Inquiries requirements and the ASTM 1527-13 standard. Conducted site reconnaissance activities and prepared final report.

• Provided continuing education training courses for New Jersey LSRP program on proper application of SESOIL and AT123D models in developing site-specific soil remediation standards. Assisted New Jersey Department of Environmental Protection with guidance development.

Prior Experience

1997-2012 Geosicence Resources Inc.

• Performed technical evaluation of proposed groundwater remediation to determine feasibility and potential efficacy for petroleum-contaminated site in southeastern Missouri involving extensive light non-aqueous phase liquid (LNAPL) contamination in an alluvial aquifer and extensive methyl tert-butyl ether (MTBE) solute plume impacting municipal water supply.

• Technical support for SESOIL modeling for cleanup level development for industrial site, San Francisco Bay area, California. Evaluated modeling and appropriate representation of volatilization and assisted in negotiating regulatory acceptance.

• Peer review and expert consulting on mercury and chlorinated hydrocarbon contamination at a MSW landfill, central Georgia. Performed comprehensive technical review of available data to evaluate chemical transport & fate for landfill gas and leachate sources and efficacy of monitored natural attenuation (MNA) for complex hydrogeologic and geochemical setting.

• Developed draft regulations for Missouri Department of Natural Resources to implement risk-based corrective action (RBCA) for petroleum storage tank sites. Developed alternative draft regulations for Missouri Petroleum Storage Tank Insurance Fund (PSTIF).

• Expert consulting on karst issues for petroleum release site, southern Missouri. Ongoing project providing review and technical support for site characterization, risk assessment and remedial design for site in karst setting on Missouri-Arkansas border.

• Water availability assessment for proposed subdivision, northern New Mexico. Geohydrologic evaluation of groundwater availability, oversight of well installation and pumping test, analysis of pumping test results and modeling of sustainability and impacts of groundwater withdrawal.

• Project management, expert consulting, expert witness and litigation support for mercury-contamination site in southeastern Wisconsin. Ongoing project involves alleged contamination from fill materials across property line, wetland and surface water impacts, solid waste disposal issues, groundwater-surface water interaction. Providing oversight and directing site characterization activities and coordinating with state and federal civil litigation and Superfund emergency response action.

• Risk assessment for former natural gas processing facility, western Nebraska. Included evaluation of contaminant and non-aqueous phase liquid (NAPL) distribution in fractured bedrock aquifer under influence of irrigation pumping and characterization of exposure from spray irrigation and crop uptake.

• Provided custom training on use of analytical solute transport models for Ohio Bureau of Underground Storage Tank Regulations (BUSTR). Focus on BIOSCREEN and AT123D models, including examination of practical impact of different model representations on results and decision-making.

• Developed guidance document on lines of evidence for evaluating natural attenuation and enhanced remediation of chlorinated solvents for DOE Savannah River Site (with T.H. Wiedemeier & Associates).

• Performed site review and developed risk assessment for TPH and BTEX contamination in soil and groundwater at a Kansas City-area trucking facility (for Williams & Co. Consultants and Missouri PSTIF).

• Provided training and consultation on risk-based decision-making to Missouri Department of Natural Resources and Petroleum Storage Tank Insurance Fund administrators and staff as prelude to administrative rule development.

• Provided training on natural attenuation as a remediation approach for contaminated sites to Canadian environmental professionals and regulators for Environmental Services Association of Alberta.

• Provided training on principles of contaminant transport and fate and parameter estimation for State of California Department of Toxic Substance Control staff.

• Developed and provided technical training on risk-based approaches to site remediation in cooperation with the Oregon Department of Environmental Quality.

• Provided training in applied transport and fate modeling for risk assessment to State of Kansas Department of Health and Environment remediation programs staff.

• Provided training on natural attenuation as a remediation approach for contaminated sites to Ohio Environmental Protection Agency staff.

• Expert witness in civil litigation regarding appropriate remedial action at a petroleum release site in southeastern Wisconsin.

• Co-developed and providing instruction for NGWA short course on advanced groundwater modeling techniques for evaluating natural attenuation and enhanced bioremediation.

• Expert peer review of feasibility study for PCB-contaminated sediments at the lower Fox River NRDA site in northeastern Wisconsin – performed for U.S. EPA Region 5.

• Expert peer review of groundwater flow model constructed for Ionia Landfill Superfund Site, Michigan – for U.S. EPA Region 5.

• Developed and presented 5-day training on monitored natural attenuation, contaminant transport and fate principles and parameter estimation, and applied soil and groundwater modeling for U.S. Army Corp of Engineers in Alaska.

• Transport and fate evaluation and modeling for risk-based closure of former dry cleaning facility in central Ohio.

• Preliminary assessment for PCB risk-based cleanup levels to support litigation of RCRA claim for a manufacturing facility in northeastern Wisconsin.

• Technical support for natural attenuation evaluation and model development to support RCRA closure at Giant Industries refinery, Bloomfield, NM.

• Strategic planning to incorporate evaluation of natural attenuation into overall facility management for RCRA closure and corrective action for major refinery facility in Texas.

• Technical peer review of modeling and technical basis for landspreading of petroleum-contaminated soil as a remediation alternative for FAA sites in Alaska.

• Site characterization and natural attenuation evaluation to support property transfer of closed dairy facility in Wisconsin with petroleum hydrocarbon contamination.

• Developed course materials and providing instruction for NGWA short courses “Transport and Fate Principles and Parameter Estimation” and “Applied Transport and Fate Modeling for Cleanup Level Determination.”

• Presented short course on natural attenuation for remediation of contaminated sites for Technical University of Denmark in Copenhagen.

• Remedial action feasibility evaluations for Texas UST sites including analysis of soil vapor extraction pilot test data and groundwater pump-test data (for Daniel B. Stephens & Associates).

• Expert witness on soil modeling and risk assessment in litigation regarding a RCRA facility closure in southern California. Contributed to development of Remedial Investigation/Feasibility Study report for site involving chlorinated solvent releases, metal contamination and perchlorate. Evaluation and interpretation of contaminant transformation and transport processes in thick vadose zone and groundwater.

1991-1997 Wisconsin Department of Natural Resources

• Expert witness on natural attenuation for litigation involving remedy selection for a landfill leachate plume at the Rhinelander Landfill. Evaluation of site hydrogeology, source characterization and contaminant distribution, and groundwater geochemistry. Reviewed and evaluated potential efficacy of proposed remedial actions.

• Developed nationally recognized guidance on the application of naturally occurring biodegradation as a remedial action. Provide state-wide oversight and direct the development and implementation of policy and guidance for the application of natural attenuation to cleanup of contaminated soil and groundwater in Wisconsin.

• Coordinated demonstration project for natural attenuation at petroleum release sites in Wisconsin with AMOCO and U.S. EPA Region 5.

• Provided training on use of natural attenuation as a remedial action to WDNR and other Wisconsin state agency staff.

• Invited speaker for American Petroleum Institute (API) Biodegradation Modeling Workshop (1994) on regulatory considerations for application of biodegradation models.

• Provided management and technical oversight of extensive modeling project for development of soil cleanup levels for Wisconsin. Responsibilities included design and development of project, evaluation and selection of appropriate unsaturated zone contaminant transport and fate models, performing and overseeing modeling work, and application of model results for development of generic soil cleanup levels for Wisconsin.

• Provided oversight and contributed to the development of a new user’s manual for the SESOIL model.

• Primary author of Wisconsin regulations for determination of soil cleanup levels (ch. NR 720) and evaluation and selection of remedial options (ch. NR 722) for contaminated sites. Contributed to development of other regulations in the NR 700 series for investigation and remediation of environmental contamination in Wisconsin.

• Developed guidance on determination of soil cleanup levels for polycyclic aromatic hydrocarbons (PAHs).

• Provided oversight and technical support for application and implementation of risk-based corrective action in Wisconsin.

• Provided technical support for remedial design, Wausau Water Supply Superfund site involving VOC contamination from multiple contaminant source areas and multiple groundwater plumes in a complex, heterogeneous river valley aquifer. Reviewed and approved proposed methodology for determination of soil cleanup levels. Provided oversight on development and application of a 3-dimensional groundwater flow model for plume capture analysis and evaluation of groundwater pumping strategies. Provided oversight on development and application of a soil gas contaminant transport model for design of soil remediation system using soil vapor extraction (SVE).

• Project hydrogeologist for National Presto Industries Superfund site. Provide project oversight and review for Remedial Investigation/Feasibility Study (RI/FS) involving VOC contamination from multiple contaminant source areas and multiple groundwater plumes in a complex, heterogeneous buried valley aquifer. Provided oversight for development and application of contaminant transport modeling using SESOIL for determination of soil cleanup levels. Provided oversight on development and application of a groundwater flow model and its use for plume capture analysis and evaluation of groundwater remediation options. Assisted in design of pilot test for large-scale soil vapor extraction (SVE) system and provided review and interpretation of results.

• Provided oversight on development of a 3-dimensional soil vapor transport model for preliminary design and evaluation of SVE system.

• Provided technical support for several additional Superfund sites, including review and interpretation of soil and groundwater sample results defining degree and extent of contamination, determination of background soil concentrations of heavy metals, review and design of sampling plans, and review of risk-based methods used for determination of cleanup levels for soil and groundwater.

• Provided review of risk assessments performed for several RCRA facility closures and corrective action sites. Reviewed and evaluated cleanup level calculations for two (2) Department of Defense (DoD) sites involving complex site conditions and combinations of contaminants, including explosives.

• Management and technical oversight of development and implementation of a comprehensive groundwater monitoring/leak detection program for a chemical UST tank farm at a RCRA facility. Evaluated and designated appropriate statistical methods for analysis and evaluation of groundwater monitoring data.

• Contributed to the development of U.S. EPA’s Soil Screening Guidance for Superfund. Provided technical review of proposed risk-based methodologies and exposure assessment criteria.

• Participated as invited state regulatory representative to U.S. EPA in strategic planning for development of a "National Risk Protocol" associated with the Superfund Reform Act of 1994.

• Provided training to professional staff of WDNR and environmental consulting firms on soil cleanup level determination and risk assessment.

• Instructed graduate and undergraduate students in geology, environmental toxicology, and environmental engineering classes and seminars at the University of Wisconsin - Madison and University of Wisconsin - Milwaukee on application of risk assessment methods in environmental regulation of contaminated sites, principles and application of environmental models in risk assessment and cleanup level determinations, the use of the SESOIL model, and use of natural attenuation as a remedial action for groundwater contamination.

• Provided technical support to WDNR solid waste management program on use of risk-based methods for determining acceptable levels of contamination for beneficial reuse of high-volume industrial solid wastes.

1985-1986 Independent Consulting - Geologist

• Evaluation of petroleum exploration potential for central and western Tennessee, including examination of regional groundwater systems and hydrogeologic implications for potential hydrocarbon accumulations. Optical and X-ray diffraction examination of well cuttings for completion data. Petrographic evaluation of cement-porosity relationships for reservoir rocks, central Appalachian Basin.

PUBLICATIONS:

Wiedemeier, T.H., and M.J. Barden. 2006. Factors affecting the sustainability of monitored natural attenuation. Proceedings of the Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds, May 22-25, 2006, Monterey, CA.

Wiedemeier, T.H., and M.J. Barden. 2006. Lines of evidence for evaluating biological and abiotic degradation of chlorinated solvents. Proceedings of the Fifth International Conference on Remediation of Chlorinated and Recalcitrant Compounds, May 22-25, 2006, Monterey, CA.

Wiedemeier, T.H., M.J. Barden, P.E. Haas, and W.Z. Dickson. 2006. Designing monitoring programs to effectively evaluate the performance of natural attenuation, in Practical Handbook of Ground-Water Monitoring (2nd edition), D.M. Nielsen (ed.), Lewis Publishers, Boca Raton, FL.

Wiedemeier, T.H., M.J. Barden, W.Z. Dickson, and D. Major. 2004. Multiple Lines of Evidence Supporting Natural Attenuation: Lines of Inquiry Supporting Monitored Natural Attenuation and Enhanced Attenuation of Chlorinated Solvents. U.S. Department of Energy, Office of Scientific and Technical Information, Oak Ridge, TN, WSRC TR 2003 00331.

National Research Council (contributing author). 2000. Natural Attenuation for Groundwater Remediation. National Academy Press, Washington, DC. 274 p.

Barden, M.J. 1997. Soil Cleanup Levels for Polycyclic Aromatic Hydrocarbons (PAHs) -- Interim Guidance. Wisconsin Department of Natural Resources, Bureau for Remediation and Redevelopment. PUBL RR-519 97, March 1997.

Yang, X., H. Glasser, R. Stoelting, M. Barden, G. Mickelson, J. Delwiche, and G. Alvarez. 1997. Natural attenuation demonstration in Wisconsin, in Fourth International Symposium on In-Situ and On-Site Bioremediation, v. 4(1). Battelle Press, Columbus, OH.

Barden, M.J. 1993 (revised 1994). Naturally Occurring Biodegradation as a Remedial Action Option -- Interim Guidance. Wisconsin Dept. of Natural Resources.

Hetrick, D.M., S. Scott, and M.J. Barden. 1992 (1994 revised). The New SESOIL User’s Guide. Wisconsin Dept. of Natural Resources, Bureau of Solid and Hazardous Waste Management, Emergency and Remedial Response Section, Publication PUBL SW-200 (revised 1994).

INVITED TALKS AND PRESENTATIONS:

Mobilization of Naturally Occurring Uranium to Supply Wells: Maris Water Conference, Tucson, AZ, April 16-18, 2018.

Mobilization of Naturally Occurring Uranium to Water Supply Wells, Southern Tucson Basin: NGWA Conference on Groundwater Issues and Science Affecting Policy and Management in the Southwest, Albuquerque, NM, February 26-27, 2018.

Practical Use of Statistics for Natural Attenuation Trend Analysis EST-0101. Environmental Institute for Continuing Education, 2003.

Natural Attenuation as a Remediation Approach – Responsible Risk Management. NMED UST Conference, Albuquerque, NM, November 16-17, 1998.

Evolving biogeochemical concepts for solute plumes in groundwater -- Natural attenuation as a remedial action. SETAC Midwest Chapter Spring Meeting, Green Bay, WI, 1997.

Natural attenuation as a remedial action -- What it is, how it works, and what's needed to use it. Wisconsin Water Well Association Annual Conference, Stevens Point, WI, February 6, 1997.

Summary of regulatory considerations and concerns for natural attenuation as a remedial action option for chlorinated organics, in U.S. EPA/Air Force Symposium on Natural Attenuation of Chlorinated Organics in Groundwater, Dallas, TX, September 11-13, 1996.

Wisconsin's approach to natural attenuation. ASTSWMO Annual Superfund Managers Conference, Phoenix, AZ, August 19-21, 1996.

Wisconsin’s Guidance on Naturally Occurring Biodegradation as a Remedial Action Option, in U.S. EPA/USGS Symposium on Intrinsic Bioremediation of Groundwater, Denver, CO, August 30 - September 1, 1994. EPA/540/R-94/515, p. 170, 1994.

Regulatory application of SESOIL for development of generic soil cleanup levels for Wisconsin. 8th National Conference on Contaminated Soils, University of Massachusetts, Amherst, MA, September 20-23, 1993.

Considerations for application of SESOIL to soil contamination field scenarios. 8th National Conference on Contaminated Soils, University of Massachusetts, Amherst, MA, September 20-23, 1993.