Technischer Bericht NTB 86-08
Sondierbohrung Schafisheim Bau- und Umweltaspekte, Bohrtechnik
The Schafisheim borehole was the fourth borehole in the Nagra deep drilling programme in Northern Switzerland.
The drilling work began on the 26th of November 1983. The final depth of 2006.5 m was reached on June 29th, 1984 and this was followed by a transition to a test phase which lasted until 25th February 1985.
To reach the final depth, the borehole passed through around 1500 m of sediments and 500 m of crystalline rock. More than 50 % of the drilled section, including more or less all of the crystalline rock, was cored.
This report describes the drilling activities, the construction work relating to the Schafisheim site and the measures taken to ensure environmental protection.
The report closes with a chapter dealing with the supervisory commission consisting of members of the federal, cantonal and local authorities and with the report series on the drilling work.
