Welcome to newmars Tom...
I am not a Mars Society Member but I am for Human space flight and that is not destination dependant in the light of recent Obama initiative to kill the Constellation program all together but that does not give you the information that you seek so here is what I have found.....
I hope you have found the main website for the Utah facility but here it is
http://desert.marssociety.org/The Mars Desert Research Station Contact Us page
http://desert.marssociety.org/MDRS/mdrs03.asp may not be all that helpful....
I would try as well the current expidition pages for a possible in to those at it as well as the engineer for the station as he may have a contact
http://engineering.marssociety.org/If you would like to be a part of the MDRS Project,
http://www.marssociety.org/portal/group ... ason9Apps/There is a ton of info to wade through so enjoy.....