Geophysical CSAMT Survey Results and Groundwater Modeling in a Groundwater Appropriation Trial

Tuesday, December 4, 2018: 11:20 a.m.
N109 (Las Vegas Convention Center)
Norman Carlson, PG , Zonge International, Inc, Tucson, AZ
Christopher Wolf, PG , Daniel B. Stephens & Associates, Inc., Albuquerque, NM
Greg Bushner, RG , Vidler Water Co., Carson City, NV

The role of geophysics in groundwater model development becomes particularly important when much of the model domain has alluvial cover, and the presence or absence of important faults that may influence groundwater flow is unknown. We discuss a good recent example at the Campbell Ranch project in New Mexico, in which much of the study area is covered by unconsolidated Quaternary units, but in surrounding areas where bedrock is exposed, the area is complicated with numerous faults and folds, with complex geologic structure. As a result, subsurface structure that may be significant in the groundwater modeling was suspected, but unknown. Since multiple aquifers were present and the depth of interest was moderately deep (> 3,000 ft), a CSAMT (controlled source audio-frequency magnetotellurics) electromagnetic survey was performed along six survey lines in an effort to better understand the subsurface. The CSAMT survey identified multiple buried faults, several of which proved important in calibration of the groundwater modeling that was used to calculate future impacts on existing wells from proposed new wells.The CSAMT results were presented during a groundwater appropriation trial in New Mexico.

Norman Carlson, PG, Zonge International, Inc, Tucson, AZ
Chief Geophysicist of Zonge International, Inc. (1979-present), formerly Quality Control Seismologist and Crew Party Chief at United Geophysical and Western Geophysical Company. Specializes in the application of electrical and electromagnetic geophysical surveys for groundwater, environmental, and other near-surface studies. Field experience includes surveys ranging from winter arctic ice air-gun surveys north of Prudhoe Bay AK to surveys in the southwestern Iranian desert.

Christopher Wolf, PG, Daniel B. Stephens & Associates, Inc., Albuquerque, NM
Christopher Wolf, P.G., specializes in water resource and hydrogeological studies including the design, installation, and evaluation of water supply wells. He applies his background in geology and geochemistry to his water-related projectsincluding water quality issues, well rehabilitation, deep exploratory wells and well field development. He has worked on water resources development and management projects with municipalities and tribes in the western U.S. for more than 23 years. He holds M.S. and B.S. degrees in geochemistry and geology, respectively, from the New Mexico Institute of Mining and Technology.

Greg Bushner, RG, Vidler Water Co., Carson City, NV
Greg Bushner is Vice President of Water Resources Development of Vidler Water Company since 2006. He worked as a consulting hydrogeologist from 2002 to 2006 as Practice Leader for Groundwater Resources, URS Corporation, and Associate Hydrogeologist with HydroSystems, Inc. from 1994 to 2002. Mr. Bushner worked for the Arizona Department of Water Resources from 1985 to 1994. Mr. Bushner specializes in hydrogeology, artificial groundwater recharge projects, water well drilling, and received a B.S. degree in geology from Northern Arizona University, Flagstaff, Arizona, 1983.