Developments in well construction

Peter Grubert: 
proof of tap water harmless properties of sealing clays by a modified elution method
Robert Haarsma: 
the new KIWA requirements for clays in water well drilling
Gunther Baumann: 
detection of clay barriers and case studies by geophysical measurements
Mona Schiller: 
recent developments of new sealing clays for water wells and geothermal drillings at SSKG
Matthias Schellhorn: 
DIN 4904: a good tool to compare properties of sealing clays for water well construction