Scope of work: Construction of drinking water well. Grab excavation borehole D=1200 to 45.0 m, installation of DIA900 steel protective casings to a depth of 45.0 m including cementing. Confirmation of complete filling by geophysical tests. Extension of borehole by rotary airlift flush drilling from 45.0 to 112.0 m depth. Consolidation of filter gravel by patented water pressure impulse generator (hypop®), pump performance trials at 350 m³/h throughput. Installation of well shaft including instrumentation, fittings as well as transfer pipeline and earthworks.