[asac][almanews] ALMA Memo 408 Released

[Stacy Oliver]

ALMA Memo #408

Geotechnical Study Chajnantor Site, II Region, Chile
Nobeyama Radio Observatory

Luis Rojas (Geo Ambiental Consultores Ltda.)

March 2000

The present Report is written by Geo Ambiental Consultores Ltda. and
summarizes the
geotechnical study of the Nobeyama Radio Observatory Authority Chajnantor
Site in
the II Region, Chile.
The site is a fairly flat area (pampa) at high altitude (approximately 5,000
m above sea
level), located at the foot of the Chajnantor and Chascón Mountains, not far
from The
Jama Pass International Road, about 80 km from the town of San Pedro de
Atacama.
The Nobeyama Radio Observatory Authority plans to install an array of large
parabolic
antennas at the site. Thus, the foundation engineers require the
geotechnical
characteristics of the subsurface for their design work. The NRO
representatives
indicated a total of six locations to drill and investigate.
The following Sections summarize the field and laboratory work developed for
the project,
give a geological description for the area and indicate the design
parameters requiered for
the development of the infrastructure for the antennas at the six locations.
Finally, the
Consultant makes recommendations for future developments in the area of the
study.
Boring logs and photographs of the rock cores are presented in the Appendix.


View a pdf version of ALMA Memo 408.
http://www.alma.nrao.edu/memos/html-memos/alma408/memo408.pdf

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