Fred D Tillman, Jr., Ph.D.
Fred Tillman joined the USGS Arizona Water Science Center in Tucson, AZ in 2006 after two-plus years as a National Research Council (NRC) fellow with the USEPA Office of Research and Development (ORD) in Athens, Georgia.
Prior to joining the USGS, Fred was a post-doctoral researcher with the Ecosystems Research Division of USEPA’s ORD from 2004 through mid-2006, working with Dr. James W. Weaver on issues related to soil vapor intrusion, particularly from leaking underground storage tanks. Fred joined EPA after completion of his doctoral degree in Environmental Engineering at the University of Virginia in 2003, where he worked with Dr. James A. Smith on the response of volatile organic compound (VOC) vapors in the unsaturated zone to natural barometric pressure fluctuations (barometric pumping).
Education and Certifications
Ph.D. 2003, Environmental Engineering, University of Virginia, Charlottesville, VA
M.S. 1998, Environmental Engineering, University of Virginia, Charlottesville, VA
B.S. 1990, Electrical Engineering, Florida State University, Tallahassee, FL
Science and Products
Filter Total Items: 46
Anthropogenic influence on groundwater geochemistry in Horn Creek Watershed near the Orphan Mine in Grand Canyon National Park, Arizona, USA Anthropogenic influence on groundwater geochemistry in Horn Creek Watershed near the Orphan Mine in Grand Canyon National Park, Arizona, USA
Breccia pipe deposits of the Grand Canyon region contain ore grade copper and uranium. Horn Creek is located near the Orphan Mine mineralized breccia pipe deposit and groundwater emerging from the bedrock in the headwaters of Horn Creek has the highest uranium concentrations in the region. Uranium decreases an order of magnitude between the groundwater at the top of the watershed and the
Authors
Kimberly R. Beisner, Collin Davidson, Fred D. Tillman
Arsenic in groundwater in the Grand Canyon region and an evaluation of potential pathways for arsenic contamination of groundwater from breccia pipe uranium mining Arsenic in groundwater in the Grand Canyon region and an evaluation of potential pathways for arsenic contamination of groundwater from breccia pipe uranium mining
The Grand Canyon in northern Arizona is an international tourist destination, a home or sacred place to many Native Americans, and hosts some of the highest-grade uranium deposits in the United States. Although potential contamination of water resources by uranium from mining activities is a concern, other elements commonly associated with these uranium deposits may pose a greater risk...
Authors
Fred D. Tillman, Kimberly R. Beisner, Casey J.R. Jones
Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type
The total concentration of dissolved constituents in water is routinely quantified by measurements of salinity or total dissolved solids (TDS). However, salinity and TDS are operationally defined by their analytical methods and are not equivalent for most waters. Furthermore, multiple methods are available to determine salinity and TDS, and these methods have inherent differences. TDS is...
Authors
R. Blaine McCleskey, Charles A. Cravotta, Matthew P. Miller, Fred D. Tillman, Paul E. Stackelberg, Katherine J. Knierim, Daniel Wise
A review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin A review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin
The Colorado River is a critical water resource in the southwestern United States, supplying drinking water for 40 million people in the region and water for irrigation of 2.2 million hectares of land. Extended drought in the Upper Colorado River Basin (UCOL) and the prospect of a warmer climate in the future pose water availability challenges for those charged with managing the river...
Authors
Fred D. Tillman, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine Rumsey, Daniel Wise, Patrick C. Longley, Morgan C. McDonnell
An assessment of uranium in groundwater in the Grand Canyon region An assessment of uranium in groundwater in the Grand Canyon region
The Grand Canyon region in northern Arizona is a home or sacred place of origin for many Native Americans and is visited by over 6 million tourists each year. Most communities in the area depend upon groundwater for all water uses. Some of the highest-grade uranium ore in the United States also is found in the Grand Canyon region. A withdrawal of over 1 million acres of Federal land in...
Authors
Fred D. Tillman, Kimberly R. Beisner, Jessica R. Anderson, Joel A. Unema
Recent and projected precipitation and temperature changes in the Grand Canyon area with implications for groundwater resources Recent and projected precipitation and temperature changes in the Grand Canyon area with implications for groundwater resources
Groundwater is a critical resource in the Grand Canyon region, supplying nearly all water needs for residents and millions of visitors. Additionally, groundwater discharging at hundreds of spring locations in and near Grand Canyon supports important ecosystems in this mostly arid environment. The security of groundwater supplies is of critical importance for both people and ecosystems in...
Authors
Fred D. Tillman, Subhrendu Gangopadhyay, Tom Pruitt
Non-USGS Publications**
Tillman, F.D and Weaver, J.W., 2007, Parameter sets for upper and lower bounds on soil-to-indoor-air contaminant attenuation predicted by the Johnson and Ettinger vapor intrusion model. Atmospheric Environment, 41, no. 27, p. 5797–5806.
Tillman, F.D and Weaver, J.W., 2007, Temporal moisture content variability beneath and external to a building and the potential effects on vapor intrusion risk assessment. Science of the Total Environment, 379, no. 1, p. 1-15.
Tillman, F.D and Weaver, J.W., 2006, Uncertainty from synergistic effects of multiple parameters in the Johnson and Ettinger (1991) vapor intrusion model. Atmospheric Environment, 40, no. 22, p. 4098–4112.
Tillman, F.D and Weaver, J.W., 2005, Review of recent research on vapor intrusion. U.S. Environmental Protection Agency Publication No. EPA/600/R-05/106, 40 p.
Weaver, J.W. and Tillman, F.D, 2005, Uncertainty and the Johnson-Ettinger model for vapor intrusion calculations. U.S. Environmental Protection Agency Publication No. EPA/600/R-05/110, 43 p.
Tillman, F.D and Smith, J.A., 2005, Vapor transport in the unsaturated zone, in Lehr, J.H., and Keely, J., eds., Water Encyclopedia: Ground Water. New Jersey, John Wiley & Sons, p. 543–548
Tillman, F.D and Smith, J.A., 2005, Site characteristics controlling airflow in the shallow unsaturated zone at Picatinny Arsenal, NJ. Environmental Engineering Science, 22, no. 1, p. 25–37.
Tillman, F.D, Bartelt-Hunt, S.L., Craver, V.A, Smith, J.A., and Alther, G.R., 2005, Relative metal ion sorption on natural and engineered sorbents: Batch and column studies. Environmental Engineering Science, 22. no. 3, p. 400–410.
Alther, G.R., Tillman, F.D, and Smith, J.A., 2005, Evaluation of Two Organoclays, Clinoptilolite, and Hydroxy-Apatite as Sorbents for Heavy Metal Removal from Water, in Calabrese E.J., Kostecki P.T., Dragun J. (eds) Contaminated Soils, Sediments and Water. Springer, Boston, MA, p. 457–468.
Tillman, F.D, Bartelt-Hunt, S.L., Smith, J.A., and Alther, G.R., 2004, Evaluation of an organoclay, an organoclay-anthracite blend, clinoptilolite, and hydroxy-apatite as sorbents for heavy metal removal from water. Bulletin of Environmental Contamination and Toxicology, 72, no. 6, p. 1134–1141.
Tillman, F.D and Smith, J.A., 2004, Design and laboratory testing of a chamber device to measure total flux of volatile organic compounds from the unsaturated zone under natural conditions. Journal of Contaminant Hydrology, 75, no. 1-2, p. 71–94.
Tillman, F.D, Choi, J.-W., and Smith, J.A., 2003, A comparison of direct measurement and model simulation of total flux of volatile organic compounds from the subsurface to the atmosphere under natural field conditions. Water Resources Research, 39, no. 10, p. 1284–1294.
Choi, J.-W., Tillman, F.D, and Smith, J.A, 2002, Relative Importance of Gas-Phase Diffusive and Advective Trichloroethene (TCE) Fluxes in the Unsaturated Zone under Natural Conditions. Environmental Science and Technology, 36, no. 14, p. 3157–3164.
Olson, M.S., Tillman, F.D, Choi, J.-W., and Smith, J.A., 2001, Comparison of three techniques to measure unsaturated-zone air permeability at Picatinny Arsenal, New Jersey. Journal of Contaminant Hydrology, 53, no. 1-2, p. 1–19.
Tillman, F.D, Choi, J.-W., Katchmark, W., Smith, J. A., and Wood, H.G.III, 2001, Unsaturated-zone airflow: Implications for natural remediation of ground water by contaminant transport through the subsurface, in Smith, J.A., and Burns, S.E., eds., Physicochemical Groundwater Remediation. New York, Kluwer Academic/Plenum Publishing, ISBN 978-0-306-46928-2, p. 307–340.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 46
Anthropogenic influence on groundwater geochemistry in Horn Creek Watershed near the Orphan Mine in Grand Canyon National Park, Arizona, USA Anthropogenic influence on groundwater geochemistry in Horn Creek Watershed near the Orphan Mine in Grand Canyon National Park, Arizona, USA
Breccia pipe deposits of the Grand Canyon region contain ore grade copper and uranium. Horn Creek is located near the Orphan Mine mineralized breccia pipe deposit and groundwater emerging from the bedrock in the headwaters of Horn Creek has the highest uranium concentrations in the region. Uranium decreases an order of magnitude between the groundwater at the top of the watershed and the
Authors
Kimberly R. Beisner, Collin Davidson, Fred D. Tillman
Arsenic in groundwater in the Grand Canyon region and an evaluation of potential pathways for arsenic contamination of groundwater from breccia pipe uranium mining Arsenic in groundwater in the Grand Canyon region and an evaluation of potential pathways for arsenic contamination of groundwater from breccia pipe uranium mining
The Grand Canyon in northern Arizona is an international tourist destination, a home or sacred place to many Native Americans, and hosts some of the highest-grade uranium deposits in the United States. Although potential contamination of water resources by uranium from mining activities is a concern, other elements commonly associated with these uranium deposits may pose a greater risk...
Authors
Fred D. Tillman, Kimberly R. Beisner, Casey J.R. Jones
Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type
The total concentration of dissolved constituents in water is routinely quantified by measurements of salinity or total dissolved solids (TDS). However, salinity and TDS are operationally defined by their analytical methods and are not equivalent for most waters. Furthermore, multiple methods are available to determine salinity and TDS, and these methods have inherent differences. TDS is...
Authors
R. Blaine McCleskey, Charles A. Cravotta, Matthew P. Miller, Fred D. Tillman, Paul E. Stackelberg, Katherine J. Knierim, Daniel Wise
A review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin A review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin
The Colorado River is a critical water resource in the southwestern United States, supplying drinking water for 40 million people in the region and water for irrigation of 2.2 million hectares of land. Extended drought in the Upper Colorado River Basin (UCOL) and the prospect of a warmer climate in the future pose water availability challenges for those charged with managing the river...
Authors
Fred D. Tillman, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine Rumsey, Daniel Wise, Patrick C. Longley, Morgan C. McDonnell
An assessment of uranium in groundwater in the Grand Canyon region An assessment of uranium in groundwater in the Grand Canyon region
The Grand Canyon region in northern Arizona is a home or sacred place of origin for many Native Americans and is visited by over 6 million tourists each year. Most communities in the area depend upon groundwater for all water uses. Some of the highest-grade uranium ore in the United States also is found in the Grand Canyon region. A withdrawal of over 1 million acres of Federal land in...
Authors
Fred D. Tillman, Kimberly R. Beisner, Jessica R. Anderson, Joel A. Unema
Recent and projected precipitation and temperature changes in the Grand Canyon area with implications for groundwater resources Recent and projected precipitation and temperature changes in the Grand Canyon area with implications for groundwater resources
Groundwater is a critical resource in the Grand Canyon region, supplying nearly all water needs for residents and millions of visitors. Additionally, groundwater discharging at hundreds of spring locations in and near Grand Canyon supports important ecosystems in this mostly arid environment. The security of groundwater supplies is of critical importance for both people and ecosystems in...
Authors
Fred D. Tillman, Subhrendu Gangopadhyay, Tom Pruitt
Non-USGS Publications**
Tillman, F.D and Weaver, J.W., 2007, Parameter sets for upper and lower bounds on soil-to-indoor-air contaminant attenuation predicted by the Johnson and Ettinger vapor intrusion model. Atmospheric Environment, 41, no. 27, p. 5797–5806.
Tillman, F.D and Weaver, J.W., 2007, Temporal moisture content variability beneath and external to a building and the potential effects on vapor intrusion risk assessment. Science of the Total Environment, 379, no. 1, p. 1-15.
Tillman, F.D and Weaver, J.W., 2006, Uncertainty from synergistic effects of multiple parameters in the Johnson and Ettinger (1991) vapor intrusion model. Atmospheric Environment, 40, no. 22, p. 4098–4112.
Tillman, F.D and Weaver, J.W., 2005, Review of recent research on vapor intrusion. U.S. Environmental Protection Agency Publication No. EPA/600/R-05/106, 40 p.
Weaver, J.W. and Tillman, F.D, 2005, Uncertainty and the Johnson-Ettinger model for vapor intrusion calculations. U.S. Environmental Protection Agency Publication No. EPA/600/R-05/110, 43 p.
Tillman, F.D and Smith, J.A., 2005, Vapor transport in the unsaturated zone, in Lehr, J.H., and Keely, J., eds., Water Encyclopedia: Ground Water. New Jersey, John Wiley & Sons, p. 543–548
Tillman, F.D and Smith, J.A., 2005, Site characteristics controlling airflow in the shallow unsaturated zone at Picatinny Arsenal, NJ. Environmental Engineering Science, 22, no. 1, p. 25–37.
Tillman, F.D, Bartelt-Hunt, S.L., Craver, V.A, Smith, J.A., and Alther, G.R., 2005, Relative metal ion sorption on natural and engineered sorbents: Batch and column studies. Environmental Engineering Science, 22. no. 3, p. 400–410.
Alther, G.R., Tillman, F.D, and Smith, J.A., 2005, Evaluation of Two Organoclays, Clinoptilolite, and Hydroxy-Apatite as Sorbents for Heavy Metal Removal from Water, in Calabrese E.J., Kostecki P.T., Dragun J. (eds) Contaminated Soils, Sediments and Water. Springer, Boston, MA, p. 457–468.
Tillman, F.D, Bartelt-Hunt, S.L., Smith, J.A., and Alther, G.R., 2004, Evaluation of an organoclay, an organoclay-anthracite blend, clinoptilolite, and hydroxy-apatite as sorbents for heavy metal removal from water. Bulletin of Environmental Contamination and Toxicology, 72, no. 6, p. 1134–1141.
Tillman, F.D and Smith, J.A., 2004, Design and laboratory testing of a chamber device to measure total flux of volatile organic compounds from the unsaturated zone under natural conditions. Journal of Contaminant Hydrology, 75, no. 1-2, p. 71–94.
Tillman, F.D, Choi, J.-W., and Smith, J.A., 2003, A comparison of direct measurement and model simulation of total flux of volatile organic compounds from the subsurface to the atmosphere under natural field conditions. Water Resources Research, 39, no. 10, p. 1284–1294.
Choi, J.-W., Tillman, F.D, and Smith, J.A, 2002, Relative Importance of Gas-Phase Diffusive and Advective Trichloroethene (TCE) Fluxes in the Unsaturated Zone under Natural Conditions. Environmental Science and Technology, 36, no. 14, p. 3157–3164.
Olson, M.S., Tillman, F.D, Choi, J.-W., and Smith, J.A., 2001, Comparison of three techniques to measure unsaturated-zone air permeability at Picatinny Arsenal, New Jersey. Journal of Contaminant Hydrology, 53, no. 1-2, p. 1–19.
Tillman, F.D, Choi, J.-W., Katchmark, W., Smith, J. A., and Wood, H.G.III, 2001, Unsaturated-zone airflow: Implications for natural remediation of ground water by contaminant transport through the subsurface, in Smith, J.A., and Burns, S.E., eds., Physicochemical Groundwater Remediation. New York, Kluwer Academic/Plenum Publishing, ISBN 978-0-306-46928-2, p. 307–340.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.