Exploration, drilling, monitoring. a complete groundwater service from GEO Resources
GEO Resources provide a complete surface groundwater source development service. From initial investigative work and budget management to HSE assessments, we manage the entire process, right through to project completion.
Our firm commitment to delivering a cost-effective, efficient and expert-led service for all our clients makes GEO Resources the perfect choice for your next project. GEO Resources assign experienced engineers to every job. They utilise the latest technology and high-quality equipment on-site, ensuring the best possible outcome for every groundwater operation.
- Surveys
- Budgeting
- Acquisition
- Project supervision
- Exploration programmes
- HSE audits & inspections
- Training and development
- Seismic data quality control
A Complete Groundwater SOURCE development service – from GEO RESOURCES
Drilling and Testing
At GEO Resources, we understand that expert project management underpins the success of groundwater source development projects.
GEO Resources borehole drilling projects encompass borehole siting, design, drilling, development and completion, borehole testing (yield and water quality) and pump installation.
Specialist expertise is essential for the smooth running of a well drilling project, across the procurement and contract management process. GEO Resources always assign an experienced project manager to oversee borehole drilling projects. Each element of the process is closely managed in order that a cost-effective, efficient service is delivered to all clients.
Borehole siting & preparation
Field observations are made of the local geology, hydrogeology and any existing (dry or wet season) water sources. Local consultations on seasonal variances in water yield and quality are undertaken as necessary. Any potential local pollution sources are identified, such as pit latrines, burial grounds, cattle pens or market areas. This fieldwork is always undertaken by a member of the GEO Resources team with extensive previous borehole development experience.
This is undertaken using resistivity or electromagnetic techniques. Must be combined with reconnaissance data and hydrogeological fieldwork. It is important to analyse geophysical data correctly so that it gives good information. Investment in training staff is often beneficial.
For further information on any of our groundwater services, or to speak to a member of our expert team,
call or email GEO Resources today.
Utilised across a range of environments and depths, the electrical resistivity technique of geophysical exploration is suitable for both soundings and profiling. This method is used to explore:
Resistivity Imaging (Tomography)
Resistivity geophysical surveys measure variations in the electrical resistivity of the ground, by applying small electric currents across arrays of ground electrodes. This technology can be used by GEO Resources to obtain images of relatively static subsurface site conditions.
The survey data is processed to produce electrical resistivity tomographs using inversion algorithms. The resistivity sections are correlated with ground interfaces such as soil and fill layers or soil-bedrock interfaces, to provide engineers with detailed information on subsurface ground conditions.
Resistivity imaging, also known as electrical resistivity tomography (ERT) is a particularly useful survey method in clayey ground, where techniques such as Ground Penetrating Radar (GPR) are less effective. The method can also help to identify transitional boundaries in subsurface layers that can be difficult to detect using other geophysical methods and is a useful tool for locating deep seated sinkholes, mine workings and detection of metallic ore bodies.
Resistivity soundings, profiles and ERT are also used to assess the geometry of aquifers and their likely water quality. These tools are particularly useful in
locating water supplies.
Time-Domain Electromagnetic (TDEM) Soundings
Time-Domain Electromagnetic (TDEM) soundings are widely used by GEO Resources in exploration geophysics for mapping subsurface layers. TDEM is a relatively low cost, rapid, and noninvasive reconnaissance tool to locate potential water resources.
The TDEM method is well suited to near-surface hydrological studies as it can be used to differentiate between fresh, brackish, and saline water. It is used to investigate the electrical conductivity of the subsurface through measurements of electromagnetic field over time.
The characteristics of the TDEM responses of the earth due to a pulsed primary signal from a large wire square-loop laid on the ground surface yields information about the variations of the electrical conductivity with depth.
The conductivity of soils and rocks are controlled by mineralogy, clay content, water content, salinity, and porosity. Changes in the conductivity of soils and rocks produce variations in the electromagnetic signature.
A combination of existing well water quality measurements borehole data and surface TDEM can be used to accurately map the subsurface water resources with one caveat: a signal from clay can sometimes produce a response similar to water.
OUR CLIENTS
Groundwater monitoring consists of measuring water levels and the sampling of water for analysis. GEO Resources deliver a complete quality control service for all clients.
GEO Resources conduct appropriate risk assessments, which can include comparison tests against environmental and/or drinking water standards. Long-term monitoring can also be conducted.
In cases where contaminants are deemed to be outside a permissible range, remedial works can then be identified, in order that the appropriate water quality is achieved.
• Monitoring wells and surface water gauge boards installed
• Monitoring of water level
• Water level loggers installed
• Gauging of surface water flow
• Pumping tested
• Sampling of water quality
• Comprehensive data analysis
Groundwater monitoring is the final, crucial element of GEO Resources’ expert water drill project management process. Our rigorous approach to not only delivering optimal value for our clients, but also ensuring safety and quality of the water supply, ensures the success of every groundwater drilling project we undertake.