Terranext engineers, hydrogeologists, and geophysicists provide water supply consulting services dedicated to the protection and development of ground water and surface water resources. Terranext uses state of the practice technology and highly skilled personnel to provide water supply services, which include:
Well Field Design/Ground Water Modeling
Metropolitan Utilities District
Terranext personnel completed the design of a 42 well water supply well field, near Omaha, Nebraska. The well field design included comprehensive planning and engineering, including: development of well designs, instrumentation and analysis of aquifer tests, evaluation of the Platte River as a source of recharge to the well field, and ground water modeling. Terranext personnel developed a ground water model, using the USGS MODFLOW code, to assist with project planning and evaluating the potential impact of the well field on other ground water users, including: other municipal well fields, local irrigators, and the hydraulic containment wells of a nearby Superfund site. The ground water model was reviewed by two districts of the United States Army Corps of Engineers (USACE), The USACE Hazardous, Toxic and Radioactive Waste Center of Expertise, the United States Environmental Protection Agency (USEPA) Region Seven, and the USEPA Center for Subsurface Modeling Support.
Well Field Design/
River Bank Filtration System Design
Lewis and Clark Rural Water System
Sioux Falls, South Dakota
Terranext completed a pre-design study for a 50 million gallon per day ground water well field near Sioux Falls, South Dakota. The well field is located adjacent to the Missouri River and will obtain most of the raw water from induced infiltration of the Missouri River. The well field design includes vertical, angle, and radial collector water supply wells. Terranext analyzed the impact of the Missouri River as a source of recharge to the well field, determined the appropriate well spacing to minimize well interference, and evaluated the impact of well field operations on the flow in the Missouri River. Additional activities performed include: development of plans and specifications for water supply wells, analysis of 72 hour pumping tests, and development of a ground water flow model. The ground water model was used to estimate the safe yield of the aquifer.
HIGH CAPACITY WATER WELL EXPLORATION
Central Iowa Water Association
Terranext personnel completed a geophysical exploration survey to determine bedrock fracture locations for a high capacity municipal water supply in central Iowa. A bedrock fracture trace analysis was conducted to determine potential fracture trace orientations and locations as Phase I of the geophysical survey. Following the results of the bedrock fracture trace analysis a surface geophysical survey was conducted to determine specific orientation, location and depth of the bedrock fractures. An electrical resistivity survey was chosen as the geophysical method of choice based on the high resistivity contrast of fracture zones. Based on Terranext’s work, two different fracture zone locations were identified. Drilling the first test well location revealed numerous large fractures and test well production from the location was over 2,000 gallon per minute (gpm). Drilling of a test well on the second location is currently being conducted.
Former Lead and Cobalt Mine
In 2003, Terranext prepared a Characterization Study Workplan and Baseline Risk Assessment for properties along a creek that flows from the former tailings area. The plan was approved by EPA and Terranext is conducting the study which includes screening of residential yards and city parks for metals using an X-Ray Fluorescence unit, collection of soil, sediment and surface water samples and coordination of access and screening of over 150 properties. Terranext is currently responsible for negotiating access and provides coordination of field activities between EPA Region 7, local residents, property owners and city personnel including dissemination of screening information and reports. Project value is approximately $2,000,000.
Project value was $88,000.
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