DESCRIPTION

The conducting of hydraulic tests and the taking of water samples in bore-holes are common tools in hydrogeological investigation. For some years now, the traditional pumping tests have been supplemented with other more specific ones, fundamentally aimed at the characterisation of media of moderate to low permeability, for which it is essential to have equipment that is likewise specific.

AITEMIN has a Mobile Hydrogeology Unit, of its own design, for carrying out highly specialised works in bore-holes located in zones that are difficult of access. Conceived with the aim of minimising the time needed for conducting tests in bore-holes, the vehicle permits the hydraulic testing and taking of water samples between plugs in bore-holes with an inclination of up to 45º and a depth of up to 500 m, the conducting of basic physical and chemical analyses of water samples and the installation of special devices, temporary or permanent, for the piezometric and hydrochemical control of aquifers.

The hydrogeology area also has complete field equipment for the in situ obtaining of the main hydrogeological parameters of interest.

AVAILABLE EQUIPMENT

• Equipment for the unit
• Electricity generating unit with rated output of 7.3 kVA and 230 V
• Winch equipped with two-speed transmission, 500 m of cable and maximum pulling capacity of 350 kgf
• Crane with a load capacity of more than 450 kgf
• Electronic panel with the necessary elements for the execution and control of the tests: data gathering systems, remote control systems for valves, and electrical power supply required for the functioning of the above.
• Injection system for specific conducting of level injection or constant flow tests and regulation of the flow in extraction tests.
• Pressure system for control of the inflating/deflating of plugs, opening of pneumatic valves of the instrumentation for the hydraulic testing and pressurisation of the pressure tank for conducting the injection tests.
• Refrigerator for the conservation of samples.
• Complementary field equipment
• Modular system for instrumentation of bore-holes of diameters between 76 and 150 mm.
• Water-level probes for measurements down to depths of 300 m.
• Submersible pressure sensors of combined precision ±0.1% (repeatability, linearity and hysteresis) and ranges 5 to 60 bar.
• Campbell Data recorders (datalogger) for continuous measurement.
• Submersible pumps of different ranges for taking of water samples and conducting of pumping tests at low flow.
• "Ruttner" type bottles and pressurised bottles for the taking of water samples in bore-holes of depth down to 300 m.
• Probes for the conducting of conductivity and temperature profiles in bore-holes of depth down to 200 m.
• Portable equipment for taking field measurements of conductivity, pH, redox potential and oxygen dissolved in water.
• Colorimetric equipment DR890 from Hach for water analysis in the field
• Khrone electromagnetic flowmeters with analog and digital output, with different ranges, for measurement of flows of up to 125 l/min.
• OTT current meter and Nautilus 2000 electromagnetic sensor for gauging of surface water.
• Hollow screw auger for the sinking of drill-holes of depths 3 or 4 m in unconsolidated materials.
• Ring infiltrometer
• Differential GPS system, Legacy of JAVAD, for taquimetry and topographical levelling, with maximum errors of 15 mm in X and Y and 20 mm en Z.