Thomas J Mack, PG
Tom Mack has been a hydrogeologist with the USGS since 1983.
Tom has conducted numerous hydrologic investigations from site-specific contaminant studies to regional-scale resource assessments in the Northeastern U.S., Afghanistan, Africa, Emirates, and Madagascar. He specializes in regional groundwater resource assessments in valley-fill and fractured-bedrock settings. Other areas of expertise include: remotely-sensed data and groundwater flow modeling in regional water-availability investigations, analysis of GIS data for regional water and mineral resource evaluation, surface and borehole geophysical techniques, and borehole drilling.
Professional Experience
Program Manager, Los Planes Watershed Water Cycle Augmentation Project, Baja California Sur, Mexico, 2022-present
Program Manager, Afghanistan Project, USDOD-USAID, 2018-2023
Senior Hydrogeologist, Kenya and Ethiopia USAID Groundwater Resources Project, 2016-2018
Groundwater Specialist, New England Water Science Center, 2014-2017
Groundwater Modeler, Abu Dhabi Groundwater Resources Project, United Arab Emirates, 2014-2016
Senior Hydrogeologist, Afghanistan Project, USAID, 2006-2009, USDOD, 2009-2014
Senior Hydrogeologist, Review team member for U.S. Nuclear Regulatory Commission, 2010-2011
Hydrogeologist, Madagascar Minerals Project, 2005-2006
Groundwater Specialist, New Hampshire-Vermont District, 1995-2012
Groundwater Investigations and Research Studies Chief, New Hampshire-Vermont District, 1995-2003
Groundwater Specialist, New England Program Area, 1992-1995
Project Chief, Hydrologist New England USEPA Superfund projects, 1985-1992
Hydrogeologist, Geophysicist, Water Resources Division, Long Island NY Subdistrict, 1983-1985
Education and Certifications
University of New Hampshire, M.S. Hydrology 1982
Hartwick College, New York, B.A. Geology 1980
Certified Professional Hydrogeologist – American Institute of Hydrology - No. 1643
Certified Professional Geologist – New York, USA, No. 24 and New Hampshire, USA, No.159
Science and Products
Preliminary assessment of trends in static water levels in bedrock wells in New Hampshire, 1984 to 2007
Integrated characterization of the Richelieu/Lake Champlain basin
Assessment of Ground-Water Resources in the Seacoast Region of New Hampshire
Hydrogeologic framework and water quality of the Vermont Army National Guard Ethan Allen Firing Range, northern Vermont, October 2002 through December 2003
Geology and preliminary hydrogeologic characterization of the cell-house site, Berlin, New Hampshire, 2003-04
Approximate potentiometric surface of the bedrock aquifer at Great Bay, southeastern New Hampshire, 2001
Geophysical characterization of fractured bedrock at Site 8, former Pease Air Force Base, Newington, New Hampshire
Simulated Ground-Water-Flow Responses to Geohydrologic Characteristics, Corinna, Maine
Geophysical investigations of well fields to characterize fractured-bedrock aquifers in southern New Hampshire
Geophysical surveys near the Charles George Municipal Landfill and Flint Pond, Tyngsboro, Massachusetts
Geophysical surveys of Country Pond and adjacent wetland, and implications for contaminant-plume monitoring, Kingston, New Hampshire, 1998
Borehole-geophysical characterization of a fractured-bedrock aquifer, Rye, New Hampshire
Science and Products
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Filter Total Items: 37
Preliminary assessment of trends in static water levels in bedrock wells in New Hampshire, 1984 to 2007
Analysis of nearly 60,000 reported values of static water level (SWL, as depth below land surface) in bedrock wells in New Hampshire, aggregated on a yearly basis, showed an apparent deepening of SWL of about 13 ft (4 m) over the period 1984–2007. Water-level data were one-time measurements at each well and were analyzed, in part, to determine if they were suitable for analysis of trends in groundAuthorsJoseph D. Ayotte, Brandon M. Kernen, David R. Wunsch, Denise M. Argue, Derek S. Bennett, Thomas J. MackIntegrated characterization of the Richelieu/Lake Champlain basin
No abstract available.AuthorsA. Rivera, C. Rivard, M. Parent, N. Benoit, R. Lefebvre, M.A. Carrier, E. Gloaguen, Richard J. Reynolds, Thomas J. Mack, J.H. Williams, Y. H. BaevskyAssessment of Ground-Water Resources in the Seacoast Region of New Hampshire
Numerical ground-water-flow models were developed for a 160-square-mile area of coastal New Hampshire to provide insight into the recharge, discharge, and availability of ground water. Population growth and increasing water use prompted concern for the sustainability of the region's ground-water resources. Previously, the regional hydraulic characteristics of the fractured bedrock aquifer in the SAuthorsThomas J. MackHydrogeologic framework and water quality of the Vermont Army National Guard Ethan Allen Firing Range, northern Vermont, October 2002 through December 2003
The Ethan Allen Firing Range of the Vermont Army National Guard is a weapons-testing and training facility in a mountainous region of Vermont that has been in operation for about 80 years. The hydrologic framework and water quality of the facility were assessed between October 2002 and December 2003. As part of the study, streamflow was continuously measured in the Lee River and 24 observation welAuthorsStewart F. Clark, Ann Chalmers, Thomas J. Mack, Jon C. DennerGeology and preliminary hydrogeologic characterization of the cell-house site, Berlin, New Hampshire, 2003-04
At the cell-house site, thin, generally less than 20-foot thick overburden, consisting of till and demolition materials, overlies fractured crystalline bedrock. Bedrock at the site consists of gneiss with thin discontinuous lenses of chlorite schist and discontinuous tabular pegmatite. Two distinct fracture domains, with principal trends to the west and northwest, and to the north, overlap near thAuthorsJames R. Degnan, Stewart F. Clark, Philip T. Harte, Thomas J. MackApproximate potentiometric surface of the bedrock aquifer at Great Bay, southeastern New Hampshire, 2001
Ground-water elevations (heads) in 265 wells were used to map the potentiometric-head surface in the fractured-bedrock aquifer adjacent to Great Bay, N.H. Remotely sensed data, spring-water temperatures and specific conductances, land-surface elevations, and simulated heads were also used to guide construction of the potentiometric surface. Heads in the bedrock aquifer locally varied more than 2AuthorsRobert M. Roseen, J.R. Degnan, L.K. Brannaka, T.P. Ballestero, Thomas J. MackGeophysical characterization of fractured bedrock at Site 8, former Pease Air Force Base, Newington, New Hampshire
Borehole-geophysical logs collected from eight wells and direct-current resistivity data from three survey lines were analyzed to characterize the fractured bedrock and identify transmissive fractures beneath the former Pease Air Force Base, Newington, N.H. The following logs were used: caliper, fluid temperature and conductivity, natural gamma radiation, electromagnetic conductivity, optical andAuthorsThomas J. Mack, James R. DegnanSimulated Ground-Water-Flow Responses to Geohydrologic Characteristics, Corinna, Maine
Ground-water-flow simulations of an idealization of surficial and bedrock aquifers of the East Branch Sebasticook River Valley, in Corinna, Maine, were done to test the effects of known or hypothesized geohydrologic characteristics on the local and regional ground-water-flow system. The purpose of the simulations was to develop a better understanding of the aquifer system to aid in planning for thAuthorsThomas J. Mack, Robert W. DudleyGeophysical investigations of well fields to characterize fractured-bedrock aquifers in southern New Hampshire
Bedrock-fracture zones near high-yield bedrock wells in southern New Hampshire well fields were located and characterized using seven surface and six borehole geophysical survey methods. Detailed surveys of six sites with various methods provide an opportunity to integrate and compare survey results. Borehole geophysical surveys were conducted at three of the sites to confirm subsurface features.AuthorsJames R. Degnan, Richard Bridge Moore, Thomas J. MackGeophysical surveys near the Charles George Municipal Landfill and Flint Pond, Tyngsboro, Massachusetts
No abstract available.AuthorsJ. D. Ayotte, Thomas J. Mack, C. M. JohnstonGeophysical surveys of Country Pond and adjacent wetland, and implications for contaminant-plume monitoring, Kingston, New Hampshire, 1998
No abstract available.AuthorsJ. D. Ayotte, Thomas J. Mack, C. M. JohnstonBorehole-geophysical characterization of a fractured-bedrock aquifer, Rye, New Hampshire
Borehole geophysical logs collected from six wells were analyzed to characterize a high-yield bedrock aquifer in the Town of Rye, New Hampshire. Video camera, caliper, fluid temperature and conductivity, natural gamma, and deviation logs were used to identify and characterize the fractured bedrock. More advanced geophysical tools included acoustic televiewer and borehole radar, which were used toAuthorsC. D. Johnson, A.H. Dunstan, Thomas J. Mack, J.W. Lane - Science
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