They are really stretching the facts there to try to make a point. Yucca Mountain, and the Armargosa Valley they mention, are about 25 miles from Death Valley National Park. Death Valley gets its name for a reason. It is a very inhospitable place, with very hot summers and almost no rain. Same for Yucca Mountain. It is a big stretch to try to call the Amargosa Valley some kind of agricultural paradise.
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You sure do not know your own facts. Death Valley is on the west side of the 8,000 foot high Amargosa Mountain Range, and the Amargosa Valley is on the east side of the Amargosa Mountain Range. Death Valley is below sea level, while Amargosa Valley is about 2,600 foot elevation. And the Yucca Mountain site is east of Amargosa Valley. Yucca Mountain is at an elevation of over 6,000 feet.
Amargosa Valley has agriculture and several small towns.
Here is one of the many DOE and USGS evaluations of Yucca Mountain as a nuclear waste repository:
https://pubs.usgs.gov/circ/1184/pdf/c1184.pdf
The USGS clearly calls out the seepage of water into the repository as an issue.
In Appendix A1:
In particular, paleoseismic data show that the 140,000- year seismic-moment-release rate for the faults in and around Yucca Mountain (Whitney, 1996) corresponds to an average of one M=6.4 earthquake per 10,000 years.
Jaak