Technischer Bericht NTB 85-12

Sondierbohrung BöttsteinBau- und Umweltaspekte, Bohrtechnik

The exploration well at Böttstein was realized as the first well within the Nagra Deep Drilling Program in Northern Switzerland.

The drilling work was started October 11, 1982. Having reached the final depth of 1501.3 m on June 5, 1983, the test phase was initiated and compleated by January 26, 1984.

The well drilled approx. 315 m of sediments and approx. 1285 m of crystalline rock. Griented cores were taken nearly over the whole length of the well.

The present report presents the drilling activities, civil construction work related to the site and precautions taken to account for environmental protection aspects.

A chapter dealing with the commission representing members of the federal, cantonal and local authorities and about reporting is given at the end of this report.