Christopher Johnson, PG Chg
Aegis Groundwater Consulting, LLC
Downhole video logging is an effective tool for assessing the before and after effects of well rehabilitation. Interpreting the efficacy of the rehabilitation can be more art than science, but there are means and methods for reducing the risks associated with such interpretation. In this final installment of Video Log Interpretation, we'll look at before and after images and video, and present tools for selecting rehabilitation methodology and improved interpretation of the rehabilitation effort efficacy.
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Chris Johnson, President of Aegis Groundwater Consulting, LLC, has been a practicing professional geologist and hydrogeologist for 31 years. Mr. Johnson has extensive experience in aquifer characterization, pumping tests, and in particular with well design, construction, maintenance and rehabilitation. Additionally, Mr. Johnson has developed an expertise in addressing naturally occurring metals such as arsenic and uranium, specifically identifying the presence in the subsurface prior to well construction, and then designing wells that avoid these areas, resulting in water supplies of reduced metals concentrations in areas of significantly elevated groundwater concentrations. Mr. Johnson is also a recognized expert in the field of well rehabilitation and well reconstruction and has published several articles on well rehabilitation for the National Groundwater Association’s “Water Well Journal”.
Dr. Abhishek Singh has over 15 years of research and consulting experience in the areas of water resources planning and management, hydrologic modeling (surface water and groundwater), risk and uncertainty analyses, optimization techniques, geographic information systems (GIS), and data analytics. Dr. Singh earned his MS and PhD in Civil and Environmental Engineering from the University of Illinois, Urbana-Champaign. As INTERA’s Manager of California Operations, Dr. Singh oversees water resources projects for Southern California water agencies and utilities. His projects focus on modeling complex hydrogeologic systems and surface-water/groundwater interactions, groundwater planning under SGMA, mitigation against seawater intrusion, reclamation of brackish groundwater, remediation of contaminated groundwater, and evaluation of climate change impacts on water resources. Dr. Singh also provides a variety of permitting and regulatory support to water agencies.
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