Types of Work


Regional and aquifer ground-water availability assessments, including evaluations of geologic setting, aquifer hydraulic characteristics, recharge-discharge balances, historical and projected future pumpage, water level trends, water quality evaluations and potential impacts from development.


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Well and well-field evaluation, including evaluating the historic, current and probable future capacities of large production wells and entire well fields. In addition, assessments have included evaluating well conditions and performance, including evaluating completion methods and zones, determining well efficiencies, evaluating conditions of existing wells, designing and conducting well rehabilitation programs, quantifying long-term production forecasts for current and potential future wells, and providing recommendations as to pumping equipment selections, settings and operations. Additionally, TGI personnel have considerable experience in assessing the integrity of well completion for water wells and injection wells, including evaluating isolation of the producing zone, analyzing cement bond logs, reviewing drilling and construction record, and evaluating production and water-quality characteristics. Water well evaluations have included large-capacity and deep wells in excess of 3,000 feet deep.


Well and well-field planning, including drilling, field-testing, providing project engineers with detailed assistance in designing wells and preparing specifications, and inspecting construction, completion and development of water wells. Wells have ranged from less than 50 to more than 1,700 feet deep, with pumping capacities of between about 10 to 3,000 gallons per minute (gpm).


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Geologic, hydrogeologic and geophysical field investigations, including conducting field investigations involving exploration drilling and coring, collecting geologic samples, obtaining and interpreting downhole geophysical logs, and collecting other pertinent geologic, hydrologic and water-quality information. Field investigations have also included surface geophysical exploration including surface resistivity and electromagnetic conductance (EM) surveys, specifically to locate gravel units favorable for large capacity wells, radial collector wells and infiltration galleries. Additionally, TGI personnel have conducted surface geologic and karst assessments atop the recharge zone of the Edwards aquifer in order to locate and characterize potential recharge features.


Spring water source assessments and development, including providing technical and consulting services with respect to evaluating potential spring water sources to assess the quantity, quality and reliability of such sources. Also, services have included providing technical design recommendations, conducting comprehensive field-testing to assess hydrogeologic settings and ground-water conditions, evaluating potential risks to spring water sources and appraising potential impacts due to development of spring water. Additionally, services have included obtaining regulatory approvals for developing excellent quality spring water sources.


Industrial and mining investigations, including environmental and hydrologic impacts assessments, water-quality monitoring and evaluations, design and operation consultation for dewatering and depressurization wells and water supply development for mining operations and facilities. Experience includes several lignite mines, gravel operations along the Colorado River, and limestone quarries in Hays, Travis and Williamson counties locally, as well as other operations across Texas and other states. Additionally, investigations have included mechanical integrity and potential contamination and impacts from injections wells in the oil industry and uranium mining industry and hydrogeologic assessments and monitoring of landfill sites.


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Ground-water quality and contamination assessments, including designing and completing monitoring well networks and programs, field investigations including drilling, soil sampling and water sampling, and evaluations of water quality with respect to natural aquifer conditions and water bearing zones impacted by contamination. Work experience has included working extensively with laboratories, developing and verifying quality assurance and control procedures and analyzing laboratory results utilizing Piper, Stiff and pattern diagrams and other diagrammatic and statistical methods. Additionally, experience has included distinguishing quality between multiple water-bearing zones, and making determinations whether ground water is directly under the influence of surface water at spring sites and near rivers and lakes.


Modeling, GIS and other computer applications, including analytical and digital flow modeling (MODFLOW), containment and solute transport modeling, creating and managing useful database and interactive GIS systems and generating maps and work products utilizing state-of-the-art CAD and GIS methods and other computer media.


Ground-water resources development and marketing, including providing services for potential buyers and sellers of ground water. TGI personnel have conducted technical reviews and investigations to assess the availability of resources and feasibility of producing large volumes of ground water targeted for transactions including sales and/or leases. Additionally, TGI personnel have conducted evaluations of regulatory and economic settings for the development and marketing of ground-water resources.