Works carried out by us

The works carried out by the company GEOtest Brno:

• Interpretation of satellite images
• Hydrogeological mapping of the vicinity of the town of Mandalgobi and the Dundgobi Aimak
• Geophysical work
• Drilling work
• Hydrodynamic tests
• Laboratory analyses
• Optical documentation of boreholes
• Installation of pumping equipment
• Installation of water treatment plants
• Installation of automatic pressure stations
• Construction work
• Training, presentations and evaluation reports

Interpretation of Landsat-7 satellite images was the starting basis for orientation concerning tectonics as well as hydrogeology.

Hydrogeological mapping of the wider vicinity of the town of Mandalgobi was conducted within the extent of Sheet L-48-81 (Mandalgobi) on a scale of 1:100 000, which was divided into 4 sections (A, B, C and D) on a scale of 1:50 000 for field investigation. Within these sections, all hydrogeological (wells, boreholes, etc.) and hydrological (springs, streams, lakes, etc.) structures were mapped.

Geophysical work was performed at the selected sites inside the urban area of the town of Mandalgobi and about 5 km south of the town of Mandalgobi. It delineated a pore-permeable aquifer of the Cretaceous Age and verified tectonic zones of a granite massif.

Within the drilling work, 3 hydrogeological wells GS 6001 to GS 6003 were installed to depths of 118, 75 and 175 m respectively. The wells passed through sediments of a Cretaceous basin and were drilled into the granite bedrock. Two of them were located inside the urban area of the town of Mandalgobi, well GS 6002 4.5 km south of the town.

Hydrodynamic tests started in 2003 in the catchment area of Olgoin Gov, which is located 30 km north of Mandalgobi and serves as a second source of water for the town. In 2004 - 2005, hydrodynamic tests were conducted in wells GS 6001 to GS 6003 and exploitable groundwater resources were verified in the town in an amount of 12 l/s of high-quality drinking water.

A total of 55 groundwater samples were subjected to laboratory analyses in 2002 - 2005. They were analysed in the laboratories of GEOtest Brno, a.s. and in laboratories of the Mongolian State University in Ulaanbaatar. Laboratory analyses were evaluated in detail.

To assess the quality of the drilling work and the technical state of old catchment structures, newly drilled wells GS 6001 - GS 6003 and existing wells 5222, 31, H1 and H4 were optically documented by camera GeoVISION of the company Marks Products, INC.

New wells GS 6001 and GS 6003 were equipped with pumps, delivery piping, cables for electric power supply to the pumps, and PVC hoses for the measurement of groundwater levels. The new water sources were connected to the existing water main in the town.

Water treatment plants - disinfection stations were installed in a hospital in Mandalgobi and in front of a water reservoir on the water feeder from the catchment area of Olgoin Gov, where the water was impounded in an underground tank to protect it from climatic effects.

Automatic pressure stations were placed on new wells GS 6001 and GS 6003 and on existing well 5222. Each automatic pressure station consists of an underground accumulation tank of 15 m³ in volume and the technology placed in the structures above the wells. The automatic pressure stations equalise pressure changes in the water-supply network.

The construction work comprised the repair of the structure on existing well 5222, the construction of 3 structures on new wells GS 6001 - GS 6003, including the fencing of the protection zone around water sources GS 6001 and GS 6003.

During the project-work implementation, several courses of training were successively held for the state administration personnel and water managers both in Mongolia and in the Czech Republic, which related to the application of hydrogeological maps, water sampling, the optimal exploitation of water resources, occupational safety and the operation of the installed technologies. Every year, a presentation of the accomplished works took place before the state administration personnel and organisations concerned in Mongolia and Czechia. Every year, annual reports were evaluated; then, at the end of the project, a final report of the project. These elaborates comprise the evaluation of all accomplished works.

The project Technological Equipment for Drinking Water Supply in Mandalgobi ended in 2005; all works were implemented, all set goals were fulfilled and all installed structures were presented in functional state to the Mongolian party.