This week I received a reply from Chipotle, and they said that they would not be able to grant me an interview, and that I should look at their website for any info that I wanted.  So that was not the ideal reply, but at least they got back to me relatively soon.  I am now exploring different topics to do my presentation on including no-till farming, and other innovations that have appeared in the farming world recently.  I know a few farmers who manage their fields using no-till methods, so I think that will probably be the route that I chose.