Two probes : 1x single U-Pipe Probe ; double U-Pipe Probe ipe Material PE-HD , SDR11ecution of Drilling :Borehole approx . 120-130m depth , no smaller than 120mm diameterPotential collapse of borehole must be prevented at all times by installation of protectiveonduitBoreholes must be fully refilled by mechanical injection of suitable injection material(manual filling by hand & shovel is not acceptable )Execution of Measurement :Between construction of probe and measurement there has to be sufficient time for soilto settle due to sagging of soilDuration of measurement shall be no less than 72hProvide back-up electricity generator in case of generator failure during measurement .Waterflow has to be constant during entire measuring period .Documentation of Measurements :rovide detailed report on execution of measurement , calculations and resultstailed descrintion of