Project Faultless is one of a eight nuclear tests that were not done at the Nevada Test Site. Basecamp was originally set up by the Atomic Energy Commission (AEC) to stage the project, but was taken over by the USAF once the AEC determined the site was not suitable for nuclear testing. One intent of Project Faultless was to move atomic testing away from Las Vegas, which was probably bad for business.
In the general area of Project Faultless, there are signs warning about petroleum laden soil. The diesel was not directly used in the drilling, but fuelled machinery. There are no warning signs regarding radioactivity since in theory there is none. The radiation in the general area is no higher than background.
To get to the site, take the Moores Station road from highway 6, located east of Basecamp. Drive until you see the so-called monument, which looks like an ugly water tank from the distance. The coordinates of the monument are posted in State Plane coordinates.. My GPS indicated the monument is at N38 38' 03.2" W116 12' 58.3" at an elevation of 6070ft.
The graffiti on the monument (left photo) is meant to mimic the shadows of bomb victims in Hiroshima and Nagasaki. The photo on the right shows substantial erosion. It may be caused by the shockwave of the nuclear explosion, similar to capturing a wave of sound. You can see the area around the monument is depressed a bit, the intermediate land is relatively level, then the ground drops again. There is yet another ring of erosion around the one shown at the front of the photo. Note that at the time of the blast, the dirt was nearly at the top of the monument, i.e. the dirt settled about 8 feet.
There are several of these markers in the general area. The look pretty old, so perhaps they mark the elevation prior to the blast.
Much of Nevada is covered with toxic waste from abandoned mines with owners who have gone bankrupt, dissolved the corporation, or are hiding in Beatty dealing blackjack. These sites don't get cleaned up. However, the US government is still in business though running a deficit. [Exception being William Jefferson Clinton in FY2000.] The state of Nevada had the feds clean up the dirty soil at Project Faultless. The gory details can be read in DOE/NV-743-REV-1. A few select pages from the document follow. The feds took all the contaminated soil and ...well...dumped it on the Nevada Test Site. I suppose you could call that a clean up.
The next image is from a topo map of the area. Note that the Central Nevada Test Area is known as Area 58. This may come in handy when playing Groom Lake Trivial Pursuit.
More Project Faultless information:
http://www.nbmg.unr.edu/slides/show.php?f=einm&&n=1.jpg
http://www.yuccamountain.org/faultless.html
http://www.atomictraveler.com/Faultless.pdf
http://www.robertwynn.com/Faultless.htm
http://ndep.nv.gov/cnta/cnta.html