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Thomas Lachmar

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Hydrogeology | Undergraduate Coordinator

Undergraduate Advisor & Faculty

Associate Professor

Contact Information

Office Location: Geology 305
DialPhone: 435.797.1247
SendEmail: tom.lachmar@gmail.com


Educational Background

PhD, Geology, University of Idaho, 1989
MS, Geosciences, Purdue University, 1977
BS, Geology, University of California, Davis, 1975

Publications - Abstracts

  • Gathro, J., Lachmar, T.E, de Lima, C., (2016). Secrets of the subsurface: Surface water recharge from the upper Logan River to ground water in Cache Valley, Utah. Geological Society of America *
  • Lachmar, T.E, McDonough, H.L, (2015). Sources, pathways and fate of metals in ground and surface waters at the abandoned Ramshorn Mine near Challis, Idaho. Geological Society of America *
  • Lachmar, T.E, Freeman, T.G, Sant, C.J, Shervais, J.W, Evans, J.P, (2013). Evaluation of the geothermal potential of the Snake River Plain, Idaho, based on three exploratory coreholes. Geological Society of America *
  • McDonough, H.L, Lachmar, T.E, (2012). Ground water and surface water contributions to metals loadings in the Bayhorse Creek at the abandoned Ramshorn Mine site near Bayhorse, Idaho. Geological Society of America *
  • Lachmar, T.E, Olsen, A.A, (2012). Identification of recharge sources for springs in Cache Valley, Utah. Association of Environmental & Engineering Geologists *
  • Inkenbrandt, P.C, Lachmar, T.E, (2010). Estimates of the hydraulic parameters of aquifers in Cache Valley, Utah and Idaho. Geological Society of America annual meeting
  • Lachmar, T.E, (2010). Ground water monitoring for wellhead protection, case study in a confined to semi-confined aquifer, Salt Lake County, Utah. Geological Society of America annual meeting
  • Lachmar, T.E, (2009). Fracture-flow hydrogeology of the Bunker Hill Mine, Kellogg, Idaho. Geological Society of America annual meeting
  • Inkenbrandt, P.C, Lachmar, T.E, (2009). Compilation of existing estimates and field measurements of aquifer parameters in Cache Valley, Utah and Idaho. Geological Society of America Rocky Mountain section meeting
  • Lachmar, T.E, Nelson, T.P, Randall, K.L, (2007). MODFLOW modeling for a proposed artificial salmon spawning channel extension near Hyder, Alaska. Geological Society of America annual meeting
  • Nelson, T.P, Randall, K.L, Lachmar, T.E, (2007). Feasibility of extending an artificial salmon spawning stream near Hyder, Alaska. Geological Society of America Rocky Mountain section meeting
  • Randall, K.L, Lachmar, T.E, (2007). Geologic and hydrochemical evaluation of the suitability of the Navajo Sandstone for CO2 sequestration in central Utah. Geological Society of America Rocky Mountain section meeting
  • Lachmar, T.E, Olsen, A.A, (2007). Identification of discharge sources to springs in southeastern Cache Valley, Utah. USU Water Initiative Spring Runoff Conference
  • Lachmar, T.E, Olsen, A.A, (2006). Discharge monitoring, chemical characterization, and source identification of springs along the east side of southern Cache Valley, Utah. Geological Society of America Rocky Mountain section meeting
  • Lachmar, T.E, Randall, K.L, (2006). Suitability of the Navajo Sandstone for CO2 sequestration in central Utah. Geological Society of America Rocky Mountain section meeting
  • Kolesar, , Evans, J.P, Lachmar, T.E, Gooseff, M.N, Payn, R., (2006). A tale of two karsts, Bear River Range, Cache National Forest, Utah. USU Water Initiative Spring Runoff Conference
  • Kolesar, P.T, Evans, J.P, Gooseff, M.N, Lachmar, T.E, Payn, R., (2005). A tale of two (or more) karsts, Bear River Range, Cache National Forest, Utah. Geological Society of America annual meeting
  • Gooseff, M.N, Evans, J.P, Kolesar, , Lachmar, T.E, Payn, R., (2005). Determination of hydrologic contributions from springs to the Logan River, Utah. American Geophysical Union spring meeting
  • Lachmar, T.E, Schieb, W.M, Evans, J.P, (2005). Hydraulic testing of a faulted sandstone reservoir - the Big Hole fault in the Navajo Sandstone, northern San Rafael Swell, Utah. Geological Society of America Rocky Mountain section meeting
  • Murch, K.L, Lachmar, T.E, Dupont, R.R, (2004). Evaluation of bioremediation suitability at a TCE-contaminated site based on large-scale column tracer and microcosm experiments. Geological Society of America Rocky Mountain and Cordilleran sections joint meeting
  • Burk, N.I, Lachmar, T.E, Kolesar, P.T, (2004). Geochemistry of metals in surface and ground water from an abandoned mine in the north fork of the American Fork River. Geological Society of America Rocky Mountain and Cordilleran sections joint meeting
  • Lachmar, T.E, (2003). Hydrogeochemical characterization of leaking CO2-charged fault zones in east-central Utah. Institut Francais du Petrole, International Conference on Gas-Water-Rock Interactions Induced by Reservoir Exploitation, CO2 Sequestration, and other Geological Storage.
  • Heath, , Evans, J.P, Lachmar, T.E, (2003). Hydrogeochemical characterization of leaking CO2-charged, low net-to-gross fault zones: the Little Grand Wash and Salt Wash fault zones, Emery and Grand Counties, Utah. American Association of Petroleum Geologists, International Conference & Exhibition
  • Heath, j.E, Lachmar, T.E, Shipton, Z.K, Nelson, S., Evans, J.P, (2002). Hydrogeochemical analysis of leaking CO2-charged fault zones: the Little Grand Wash and Salt Wash fault zones, Emery and Grand Counties, Utah. Geological Society of America Abstracts with Programs
  • Bradbury, , Evans, J.P, Yonkee, , Lachmar, T.E, (2002). Structural characterization of folded and fractured sedimentary bedrock aquifers near Park City, Utah. Fractured-Rock Aquifers 2002 Conference
  • Lachmar, T.E, Robinson, J.M, (2001). Hydrostratigraphic and chemical characterization of groundwater and surface water interactions in Cache Valley, Utah. Geological Society of America Rocky Mountain and South-Central sections joint annual meeting
  • Forster, C.B, Evans, J.P, Shipton, Z.K, Lachmar, T.E, (2000). Deformation bands; networks of low permeability systems associated with faults in sandstone:. American Geophysical Union spring meeting
  • Evans, J.P, Lachmar, T.E, Robeson, K., Schieb, B., Shipton, Z., Forster, C.B, Snelgrove, S.S, S.S, (1999). Detailed Three-Dimensional Fault Zone Structure and Hydraulic Properties of the Big Hole Normal Fault, Utah. American Association of Petroleum Geologists annual convention
  • Lachmar, T.E, Hadley, H.K, Kolesar,, P.T, (1997). Chemical and isotopic signatures of ground water and their use in identifying the source of salinity in ground water in southern Juab Valley, Juab County, Utah. Geological Society of America Abstracts with Programs
  • Lachmar, T.E, Hadlock, G.L, McCalpin,, J.P, (1997). The relationship between the water table and the surface flow of a losing stream, lower Medano Creek, Great Sand Dunes National Monument, Colorado. Environmental Geology
  • Lachmar, T.E, Jones, A.V, Hubbell, J.M, (1995). Hydraulic and geochemical evidence for seasonal migration of recharge through the vadose zone at the Idaho National Engineering Laboratory, Idaho:. Geological Society of America Abstracts with Programs
  • Lachmar, T.E, Gadt, J.W, Forster, C.B, (1994). Ground water monitoring for wellhead protection in a confined to semiconfined aquifer, Salt Lake County, Utah. Geological Society of America Abstracts with Programs
  • Lachmar, T.E, Gadt, J.W, (1994). The application of isotopes to delineating wellhead protection areas in a confined to semiconfined aquifer, Salt Lake County, Utah. Geological Society of America Abstracts with Programs
  • Lachmar, T.E, Hadlock, G.L, McCalpin, J.P, (1994). The hydrogeology of lower Medano Creek, Great Sand Dunes National Monument, San Luis Valley, Colorado. Geological Society of America Abstracts with Programs
  • Gadt, J.W, Lachmar, T.E, Forster, C.B, (1993). Ground water monitoring for wellhead protection -- case study in a confined to semiconfined aquifer, Salt Lake County, Utah. American Water Resources Association's 23rd Annual Rocky Mountain Groundwater
  • Lachmar, T.E, (1992). Identification of ground water recharge areas for the Cub River, Franklin County, Idaho:. Geological Society of America Abstracts with Programs
  • Lachmar, T.E, Williams,, R.E, (1988). Analysis of fracture flow at the Bunker Hill Mine. Geological Society of America Abstracts with Programs

Publications - Books & Book Chapters

    Book Chapters

  • Heath, J.E, Lachmar, T.E, Evans, J.P, Kolesar, P.T, Williams, A.P, (2009). Hydrogeochemical characterization of leaking carbon-dioxide charged fault zones in east-central Utah, with implications for geologic carbon storage: Sequestration and Its Role in the Global Carbon Cycle. Geophysical Monograph Series
  • Lachmar, T.E, Schieb, W.M, (2007). Impact of the Big Hole fault on fluid flow in the Navajo Sandstone, northern San Rafael Swell, Utah. Guidebook to the Geology of Central Utah, Utah Geological Association
  • Lachmar, T.E, Gadt, J.W, Robinson, J.M, (2004). Isotopic characterization of ground water in Salt Lake and Cache Valleys, Utah. Ground Water in Utah: Resource, Protection, and Remediation, Utah Geological Association
  • Lachmar, T.E, Myers, B., Robinson, J.M, (2004). Updated conceptual and MODFLOW ground-water models of Cache Valley, Utah and Idaho. Ground Water in Utah: Resource, Protection, and Remediation, Utah Geological Association

* Has not been peer reviewed

Publications - Fact Sheets

    * Has not been peer reviewed

    Publications - Curriculum

      * Has not been peer reviewed

      Publications - Journal Articles

        Academic Journal

      • Lachmar, T.E, Burk, N.I, Kolesar, P.T, (2006). Groundwater contribution of metals from an abandoned mine to the North Fork of the American Fork River, Utah. Water, Air, and Soil Pollution, 173, 103-120.
      • Berkey, J.S, Lachmar, T.E, Doucette, W.J, Dupont, R.R, (2003). Tracer studies for evaluation of in situ air sparging and in-well aeration system performance at a gasoline-contaminated site. Journal of Hazardous Materials, B98, 127-144.
      • Lachmar, T.E, Bradbury, K.K, Evans, J.P, (2002). Structure and hydrogeology of deformed sedimentary bedrock aquifers, western Summit County, Utah. Environmental & Engineering Geoscience, 8:3, 219-236.
      • Hall, B.L, Lachmar, T.E, Dupont, R.R, (2001). Field monitoring and performance evaluation of a field-scale in-well aeration system at a gasoline-contaminated site. Journal of Hazardous Materials, B82, 197-212.
      • Hall, B.L, Lachmar, T.E, Dupont, R.R, (2000). Field monitoring and performance evaluation of an in situ air sparging system at a gasoline-contaminated site. Journal of Hazardous Materials, B74, 165-186.
      • Hall, B.L, Lachmar, T.E, Baldwin, C.K, Dupont, R.R, (2000). Instrumentation design and installation for monitoring air injection technologies. Ground Water Monitoring & Remediation, XX:2, 46-54.
      • Lachmar, T.E, Forster, C.B, Oliver, D.S, (1997). Comparison of models for delineating wellhead protection areas in confined to semiconfined aquifers in alluvial basins. Ground Water, 35:4, 689-697.
      • Lachmar, T.E, Gadt, J.W, (1995). Identification of recharge areas for irrigation water in carbonate terranes: Journal of Soil and Water Conservation. Journal of Soil and Water Conservation, 50:4, 378-382.
      • Lachmar, T.E, (1994). Application of fracture-flow hydrogeology to acid-mine drainage at the Bunker Hill Mine, Kellogg, Idaho. Journal of Hydrology, 155:1-2, 125-149.
      • Lachmar, T.E, El-Bihery, M.A, (1994). Groundwater quality degradation as a result of overpumping in the delta Wadi El-Arish area, Sinai Peninsula, Egypt:. Environmental Geology, 24:4, 293-305.
      • Lachmar, T.E, Gadt, , Forster, , (1993). Ground water management for wellhead protection in a confined to semiconfined aquifer, Salt Lake County, Utah: Management of Irrigation and Drainage Systems: Integrated Perspectives. American Society of Civil Engineers, 289-296.
      • Lachmar, T.E, (1993). The influence of fracture properties on ground water flow at the Bunker Hill Mine, Kellogg, Idaho. Bulletin of the Association of Engineering Geologists, XXX:4, 395-407.
      • Professional Journal

      • Nelson, T.P, Lachmar, T.E, (2013). Design of a ground water model to determine the feasibility of extending an artificial salmon-spawning stream: case study for Marx Creek near Hyder, Alaska. Applied Water Science/Springer, 3:3, 613-624. doi: 10.1007/s13201-013-0119-9
      • Shervais, J.W, Nielson, D.L, Evans, J.P, Lachmar, T.E, Christiansen, E.H, Morgan, L., Shanks, W.P, Delahunty, C., Schmitt, D.R, Liberty, L.M, Blackwell, D.D, (2012). Hotspot: The Snake River Geothermal Drilling Project -- Initial Report. Geothermal Resources Council Transactions, 36, 767-772.
      • Lachmar, T.E, Freeman, T., Shervais, J.W, Nielson, D.L, (2012). Preliminary Results: Chemistry and Thermometry of Geothermal Water from MH-2B Test Well. Geothermal Resources Council Transactions, 36, 689-692.

      * Has not been peer reviewed

      Publications - Literary Journal

        * Has not been peer reviewed

        Publications - MultiMedia

          * Has not been peer reviewed

          Publications - Technical Reports

            * Has not been peer reviewed

            Publications - Translations & Transcripts

              Publications - Other

                * Has not been peer reviewed

                Scheduled Teaching

                GEO 2250 - Introductory Internship/Co-op, Spring 2017

                GEO 1110 - Physical Geology, Spring 2017

                GEO 4900 - Special Problems, Spring 2017

                GEO 4900 - Special Problems, Spring 2017

                GEO 2500 - Geology Field Excursions, Fall 2016

                GEO 5510 - Groundwater Geology, Fall 2016

                GEO 1110 - Physical Geology, Fall 2016

                GEO 4900 - Special Problems, Fall 2016

                GEO 4900 - Special Problems, Summer 2016

                GEO 4900 - Special Problems, Spring 2016

                GEO 4900 - Special Problems, Spring 2016

                GEO 4900 - Special Problems, Spring 2016

                GEO 5520, 6520 - Techniques of Groundwater Investigations, Spring 2016

                GEO 5510 - Groundwater Geology, Fall 2015

                GEO 1110 - Physical Geology, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 1115 - Physical Geology Laboratory, Fall 2015

                GEO 4800 - Senior Seminar, Fall 2015

                GEO 4900 - Special Problems, Fall 2015

                GEO 2250 - Introductory Internship/Co-op, Summer 2015

                GEO 4900 - Special Problems, Spring 2015

                GEO 5520 - Techniques of Groundwater Investigations, Spring 2015

                GEO 6520 - Techniques of Groundwater Investigations, Spring 2015

                GEO 5510 - Groundwater Geology, Fall 2014

                GEO 1110 - Physical Geology, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 1115 - Physical Geology Laboratory, Fall 2014

                GEO 4900 - Special Problems, Fall 2014

                GEO 4250 - Advanced Internship/Co-op, Spring 2014

                GEO 1110 - Physical Geology, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 1115 - Physical Geology Laboratory, Spring 2014

                GEO 4800 - Senior Seminar, Spring 2014

                GEO 4900 - Special Problems, Spring 2014

                GEO 4900 - Special Problems, Spring 2014

                GEO 5510 - Groundwater Geology, Fall 2013

                GEO 4800,6820 - Senior Seminar, Fall 2013

                GEO 4900 - Special Problems, Fall 2013

                GEO 4800 - Senior Seminar, Spring 2013

                GEO 4900 - Special Problems, Spring 2013

                GEO 5520 - Techniques of Groundwater Investigations, Spring 2013

                GEO 5510 - Groundwater Geology, Fall 2012

                GEO 1110 - Physical Geology, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 1115 - Physical Geology Laboratory, Fall 2012

                GEO 4900 - Special Problems, Fall 2012

                GEO 4250 - Advanced Internship/Co-op, Spring 2012

                GEO 2250 - Introductory Internship/Co-op, Spring 2012

                GEO 5520,6520 - Techniques of Groundwater Investigations, Spring 2012

                GEO 2500 - Geology Field Excursions, Fall 2011

                GEO 5510 - Groundwater Geology, Fall 2011

                GEO 1110 - Physical Geology, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 1115 - Physical Geology Laboratory, Fall 2011

                GEO 4900 - Special Problems, Summer 2011

                GEO 1110 - DYNAMIC EARTH (BPS), Spring 2011

                GEO 5600 - GEOCHEMISTRY, Spring 2011

                GEO 2250 - INTRO INTERN/CO-OP, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 1110 - LABORATORY, Spring 2011

                GEO 4900 - SENIOR SEMINAR, Spring 2011

                GEO 5650 - SENIOR THESIS, Spring 2011

                GEO 4900 - SPECIAL PROBLEMS: UG RESEARCH, Spring 2011

                GEO 5510 - Groundwater Geology, Fall 2010

                GEO 1115 - Physical Geology Laboratory, Fall 2010

                GEO 5650 - Senior Thesis, Fall 2010

                GEO 4900 - Special Problems, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                GEO 1110 - The Dynamic Earth: Physical Geology, Fall 2010

                USU 1010 - University Connections, Fall 2010


                Graduate Students Mentored

                Skyler Sorsby, Geology, August 2016
                Hannah McDonough, Geology, August 2010 - February 2015
                Thomas Freeman, Geology, August 2010 - December 2013
                P Inkenbrandt, 2010
                T Nelson, 2010
                K Randall, 2009
                A Olsen, 2007
                J Heath, 2004
                N Burk, 2004
                W Schieb, 2004
                B Myers, 2003
                K Murch, 2003
                J Robinson, 1999
                A Jones, 1995
                G Hadlock, 1995
                J Gadt, 1994
                M El-Bihery, 1993