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Science Research

Waste Management’s professional staff are encouraged to participate in the public and scientific community dialogue on environmental science and the performance of the environmental service facilities and technologies the company employs. Listed below are key contributions our experts have provided:

Foster-Wittig, T.A., Thoma, E.D., Green, R.B., Hater, G.R., Swan, N.D., & Chanton, J.P. (2015). “Development of a mobile tracer correlation method for assessment of air emissions from and landfills and other area sources.” Atmospheric Environment, 102: 323–330. https://doi.org/10.1016/j.atmosenv.2014.12.008

de la Cruz, F. B., R. B. Green, G. R. Hater, J. P. Chanton, E. D. Thoma, T. A. Harvey, & Barlaz, M. A. (2016). “Comparison of field measurements to methane emissions models at a new landfill.” Environmental Science & Technology, 50(17):9432-9441. https://doi.org/10.1021/acs.est.6b00415

Cambaliza, M.O.L., Bogner, J.E., Green, R.B., Shepson, P.B., Harvey, T.A., Spokas, K.A., Stirm, B.H., & Corcoran, M. (2017). “Field measurements and modeling to resolve m2 to km2 CH4 emissions for a complex urban source: An Indiana landfill study.” Elementa: Science of the Anthropocene, 5:36. http://doi.org/10.1525/elementa.145

Kormi, T., Bel Hadj Ali, N., Abichou, T. & Green, R. (2017). “Estimation of landfill methane emissions using stochastic search methods.” Atmospheric Pollution Research, 8(4): 597-605. https://doi.org/10.1016/j.apr.2016.12.020

Kormi, T., Mhadhebi, S., Bel Hadj Ali, N., Abichou, T. & Green, R. (2018). “Estimation of fugitive landfill methane emissions using surface emission monitoring and Genetic Algorithms optimization.” Waste Management, 72: 313-328. https://doi.org/10.1016/j.wasman.2016.11.024

Sparrow, K.J., Chanton, J.P., Green, R.B., Scheutz, C., Hater, G.R., Wilson, L.C., & Abichou, T. (2019). “Stable isotopic determination of methane oxidation: When smaller scales are better.” Waste Management, 97: 82–87. https://doi.org/10.1016/j.wasman.2019.07.032

Bel Hadj Ali, N., Abichou, T., & Green, R. (2020). “Comparing estimates of fugitive landfill methane emissions using inverse plume modeling obtained with surface emission monitoring (SEM), drone emission monitoring (DEM), and downwind plume emission monitoring (DWPEM).” Journal of the Air & Waste Management Association, 70:4, 410-424. https://doi.org/10.1080/10962247.2020.1728423

Abitchou, T., Johnson, T., Mahieu, & Chanton, J.P. (2010). Developing a design approach to reduce methane emissions from California landfills. Proceedings of the 21st Geocongress, West Palm Beach, Florida.

Abitchou, T., Kormi, T., Yuan, L., Johnson, T., & Escobar, F. (2015). Modeling the effects of vegetation on methane oxidation and emissions through soil landfill final covers across different climates. Waste Management, 36, 230–240.

Cabral, A. R., Moreira, J.V., & Jugnia L, B. (2010). Biocover performance of landfill methane oxidation: Experimental results. Journal of Environmental Engineering, August 2010, 785–793.

Johnson, T. (2009). Course on Landfill capping, emissions and methane oxidation — A closer look. Alberta Research Council, Edmonton, Alberta.

Johnson, T. (2009). Presentation on landfill gas control and emissions for landfill cover systems. Minnesota Environmental Initiative (MEI) Stakeholder meeting, St. Paul, MN.

Johnson, T. (2009). Workshop on landfill gas control and emission and ET cover case studies. RWQCB Water Board, Fresno, CA.

Khire, M., et.al. (2012), Estimation of vertical flux in an instrumented earthen cover. Global Waste Management Symposium 2012 Proceedings, Phoenix, AZ.

Letourno M., Cabral, A.R., & Johnson, T. (2011). Evaluation of candidate materials for the construction of a passive methane oxidation biocover. Thirteenth International Waste Management and Landfill Symposium. Sardinia, S. Margherita di Pula, Cagliari, Italy.

McGrath, A.E., Upson, G.L., & Caldwell, M.D. (2007). Evaluation and mitigation of landfill gas impacts on cadmium leaching from native soils. Groundwater Monitoring and Remediation, 4, 99-109.

Morris, J.W.F., Caldwell, M.D., Obereiner, J.M., O’Donnell, S.T., Johnson, T.R., & Abichou, T. (2018). Modeling methane oxidation in landfill cover soils as an indicator of functional stability with respect to gas management. Journal of the Air & Waste Management Association, DOI: 10.1080/10962247.2018.1500403

Nandanga, E., Cabral, A.R., Bradley, R. & Johnson T. (2013). Potential effect of vegetation on methane oxidation efficiency of biocovers: Laboratory and field experiment. Fifteenth International Waste Management and Landfill Symposium. Sardinia, S. Margherita di Pula, Cagliari, Italy.

Roncato, C., Letourneau, M., & Cabral, A.R. (2010). Comparison between field and laboratory methane oxidation rates. Proceedings of the 21st Geocongress, West Palm Beach, Florida.

Gross, B., et. al. (2011). Numerical examination of runoff in the water balance of an evapotranspirative cover. Journal of Environmental Quality (pending journal review).

Hardt, C. (2008). Numerical evaluation of preferential flow through evapotranspirative landfill covers. Master’s thesis, Department of Civil & Environmental Engineering, Michigan State University.

Johnson, T. (2009). Ecological restoration plan, ET covers, stormwater controls and wildlife habitat. Dickinson LF IDNR Meeting, Des Moines, IA.

Johnson, T. (2009). Workshop on ET cover technology. WDNR Meeting, Madison, WI.

Johnson T. (2010). Modern landfill water balance, and alternative final covers and landfill gas and emission control. USEPA ET Cover Workshop, Austin, TX.

Johnson, T. (2011). ET cover role in ecological restoration. IDNR Offices, Des Moines, IA.

Johnson, T. (2011). Modern landfill water balance, and case studies from Waste Management’s alternative final cover program. USEPA ET Cover Workshop, Denver, CO.

Kaushik, T., Khire, M.V., Johnson, T.J., & Caldwell, M.D. (2014). Surface runoff at an instrumented catchment-scale water balance final cover. ASCE Geo-Congress Symposium, Atlanta, GA, (accepted).

Khire, M., et.al. (2014). Catchment-scale hydrology of a water balance final cover located in Texas. Global Waste Management Symposium Proceedings, Orlando, FL.

Khire, M. & Johnson, T. (2010). Effect of geocomposite drainage layer on water balance of evapotranspiration cap lysimeters, Global Waste Management Symposium Proceedings, San Antonio, TX.

Khire, M., & Mijares, M. (2008), Influence of waste layer on percolation estimates for earthen caps in sub-humid climates. GeoCongress, American Society of Civil Engineers, New Orleans, LA.

Khire, M.V. (2016). Geoclimatic design of water balance covers for municipal solid waste landfills in Texas. Lone Star Chapter of SWANA.

Mijares, M., Khire, M. & Johnson, T. (2009). Soil water storage in lysimeters versus actual earthen caps for landfill applications. GeoFlorida, American Society of Civil Engineers, West Palm Beach, FL. In preparation.

Mijares, R. G., Khire, M. V., & Johnson, T. R. (2011). Field scale evaluation of lysimeters versus actual caps. Geotechnical Testing Journal, 35(1).

Mijares, R., Khire, M., Benson, M., & Simunek, J. (2009). Preferential flow through earthen caps. Water Resources Research. In preparation.

Bull, L.P. (2009). Alternative landfill covers — Technical and regulatory considerations for continued progress. Colorado Department of Public Health and Environment (CDPHE) Workshop, Denver, CO.

Bull, L.P., & Dwyer, S.F. (2006). Evaluating the VADOSE/W model for deployment of evapotranspiration (ET) covers in cold and wet climates. Waste Tech Symposium, Phoenix, AZ.

Bull, L.P., & Dwyer, S.F. (2008). Establishing a practical flux performance criterion for Subtitle D alternative final cover systems. Global Waste Symposium, Copper Mountain, CO.

Bull, L.P. & Dwyer, S.F. (2008). Performance criteria for alternative final cover systems on lined RCRA Subtitle D landfills. Global Waste Symposium, Copper Mountain, CO.

Bull L.P., Dwyer, S.F., & Wampler, S. (2010). Alternative final cover (AFC) design report. Prepared for U.S. EPA and Tribal EPA, Tooele County, UT.

Johnson, T. (2008). Alternative covers workshop. International Phytotechnology Society, Raleigh, NC.

Lakhouit, A., Shirmer, W., Johnson, T., Cabana, H., & Cabral, A.R. (2014). Evaluation of the efficiency of an experimental biocover to reduce BTEX emissions from landfill biogas. Chemosphere, 97, 98–101.

Obereiner, J (2009). Alternative landfill covers — building a sustainable final cover at Greater Wenatchee Regional Landfill WDOE and CDHD meeting. Wenatchee, WA.

Prucha, C.P., & Johnson, T.J. (2008). Alternative landfill covers — Current practice and key technical considerations. Presentation at Federation of New York Solid Waste Associations Annual Conference.

Bull, L.P., Obereiner,. J, Verwiel, M., & Wampler, S. (2004). Reducing potential for landfill gas impacts to groundwater, another potential advantage of alternative landfill covers. SWANA, 9th Annual Landfill Symposium, Monterey, CA.

Bull, L.P., & Wampler, S.W. (2006). Landfill impacts to shallow groundwater: What is the real issue? Presentation at Colorado SWANA Conference.

Caldwell, M.D., & Fischer, D.A. (2008). Remote analytical and telemetry systems for groundwater monitoring. Global Waste Management Symposium, Copper Mountain, CO.

Caldwell, M.D., & Baker, J.A. (2006). Aerobic bioremediation of vinyl chloride in groundwater at a solid waste landfill using a vadose zone air injection trench. WasteTech Landfill Technology Conference Proceedings, Phoenix, AZ.

Caldwell, M.D., & Wallis, E.E. (2006). An empirical evaluation of impacts to groundwater from Subtitle D-lined solid waste disposal cells, WasteTech Landfill Technology Conference Proceedings, Phoenix, AZ.

McGrath, A.E., Upson, G.L., & Caldwell, M.D. (2007). Evaluation and mitigation of landfill gas impacts on cadmium leaching from native soils. Groundwater Monitoring and Remediation, 4, 99–109.

Morell, D., Verwiel, M., Thrupp, G., & Fowler, W. (2007). Study of basalt dikes influence on groundwater flow, Waimanalo Gulch Sanitary Landfill, Oahu, Hawaii. International Solid Waste Symposium, Sardinia, Italy.

Ramaley, S.B. (2011). Use of investigative tools to evaluate the source of landfill impacts to groundwater. Clemson Hydrogeology Symposium.

Verwiel, M., Obereiner, J., & Seyfried, S. (2000). Effects of landfill gas on groundwater quality at a municipal solid waste facility. Arizona Solid Waste Conference, Tucson, AZ.

Verwiel, M., & Prucha, C.P. (2006). The effects of well integrity on groundwater monitoring and conceptual model development. Presentation at Engineering Society of Detroit Annual Conference, Detroit, MI.

Verwiel, M., Thrupp, G., & Purdy, S. (2001). Landfill expansion beneath the water table in central Arizona, May 2001. International Landfill Symposium Proceedings, Sardinia, Italy.

Hagedorn, B., Kerfoot, H., Verwiel, M., & Matlock, B. (2016). Assessing landfill gas age and attenuation characteristics — Geochemical constraints from a municipal solid waste landfill in Southern California. Proceedings G WMS, Indian Wells, CA.

Kerfoot, H., Hagedorn, B., & Verwiel, M. (2013). Evaluation of the age of landfill gas methane in landfill gas–natural gas mixtures using co-occurring constituents. Environmental Science: Processes & Impacts.

Kerfoot, H., & Verwiel, M. (2012). Evaluation of Methane Sources in Mixtures of Natural Gas and Biogas. Battelle Conference, Monterey, CA.

Verwiel, M. (2008). Case Study on the Role of Monitoring Well Structural Integrity on a VOC Monitoring Program at a Hazardous Waste Facility in the Western United States. ESD 17th Annual Michigan Solid Waste Conference.

Bull L.P., & Franc, M. (2015). NORM/TENORM waste acceptance considerations. White paper prepared for U.S. EPA and Tribal EPA. Tekoi Landfill, Tooele County, UT.

Foody, P.E, Kevin, Funderburg, M., & Whittington, B. (2019). Advantages of single source contracting in-plant CCR services. World of Coal Ash Conference. St. Louis, MO.

Gibbons, R.D., & Bull, L.P. (2006). Statistically based data evaluation methodologies for municipal solid waste leachate. Waste Tech Landfill Technology Conference. Phoenix, AZ.

Khire, M.V., Saravanathiiban, D.S., Verwiel, M., Prucha, C.P., & Johnson, T.J. (2015). Stormwater sediment filtration using sand versus synthetic fibers. American Society of Civil Engineers, Geotechnical Special Publication.

Nash, K., Funderburg, M., & Kamp, R. (2019). Best practices during closure. World of Coal Ash Conference. St. Louis, MO.

Ramaley, S.B., Wiseman, L., Sterling, L., Gabel, C., & Foster, J. (2015). Challenging traditional regulatory approaches to landfill permitting and construction. Presentation at WASTECON.

Suchomel, M., Verwiel, M., & Thrupp, G. (2011). A new method for calculating waste acceptance criteria for soil at landfills. International Solid Waste Symposium. Sardinia, Italy.

Verwiel, M., Cetrullo, J., Baquerizo, E., Jercan, M., & Caldwell, M. (2007). Applied Landfill Informational Analysis System (ALIAS): Development of a relational database system used to analyze the effects of landfill operational performance characteristics. International Solid Waste Symposium. Sardinia, Italy.

Caldwell, M.D., Obereiner, J., & Morris, J.W. (2016). Case study for prediction of a performance-based PCC term for LFG collection systems using passive controls. Global Waste Management Symposium. Indian Wells, CA.

Gibbons, R.D., Morris, J., Prucha, C., Caldwell, M.D., & Staley, B. (2014). Longitudinal data analysis in support of functional stability concepts for leachate management at closed municipal landfills. Waste Management, 34(9), 1674–1682.

Gibbons, R.D., Prucha, C.P., & Caldwell, M.D. (2007). Longitudinal analysis of leachate data from closed MSW landfill cells. WasteTech Landfill Technology Conference Proceedings. Miami, FL.

Morris, J.W., Caldwell, M.D., & Bull, L.P. (2008). Leachate trends, end use, and the ‘sustainable’ landfill. SWANA Landfill Symposium. Palm Springs, CA.

Morris, J.W., Caldwell, M.D., & Bull, L.P. (2012). Application of a performance-based methodology to evaluate optimization and completion of post-closure care at a municipal landfill. Global Waste Management Symposium. Phoenix, AZ.

Morris, J.W., Caldwell, M.D., Bull, L.P., Crest, M., & Ackerman, A. (2013). Functional stability and completion of post-closure care at municipal landfills: Findings from application of a performance- based methodology. International Waste Management and Landfill Symposium. Sardinia, Italy.

O’Donnell, S.T., Caldwell, M.D., Barlaz, M. A., & Morris, J. W.F. (2018). Case study comparison of functional stability vs. organic stability approaches for assessing threat potential at closed landfills in the USA. Waste Management, 75, 415–426.

Prucha, C.P. (2004). Ending post closure care. Presentation at Waste Management, Niagara Frontier Section Annual Meeting.

Verwiel, M., & Baker, J. (2005). Implementation of the EREF guidance for post closure care modifications: A case study of Olympic View Sanitary Landfill. Waste Expo. Las Vegas, NV.

Bull, L. (2010). Sustainable remediation panel — Is it cost-effective and feasible to implement renewable energy solutions at remediation sites? Remediation, 20, 33–138.

Holland, K. S., Lewis, R.E., Tipton, K., Karnis, S., Dona, C., Petrovskis., E., Bull, L. P., Taege, D., & Hook, C. (2011). Framework for integrating sustainability into remediation projects. Remediation, 21(3), 7–38.

Lowe, J., Funderburg, M., & Fedorka, B. (2019). Excavation and beneficiation considerations. World of Coal Ash Conference, St. Louis, MO.

Caldwell, M.D., Delfino, T., & Green, R. (2018). Evaluating landfill liquids to predict elevated temperature conditions. Global Waste Management Symposium. Indian Wells, CA.

Johnson, T., Khire, M., & Holt, R. (2018). Heat generation and heat transfer in MSW landfills using geothermal modeling. Global Waste Management Symposium. Indian Wells, CA.

Khire, M., Johnson, T., & Holt, R. (2020). Geothermal modeling of elevated temperature landfills. ASCE GeoCongress 2020. Minneapolis, MN.

Robinson, S. (2019). The precarious state of recycling as China closes its door to imports. EM: The Magazine for Environmental Managers. March 2019, 7–11.

Caldwell, M. (2008). Air injection into the vadose zone to aerobically degrade volatile organic compounds in groundwater and inhibit subsurface landfill gas migration. US Patent No. 7,618,547. Washington, DC: U.S. Patent and Trademark Office.