Stonehenge has it right.
Although there is some letters to write before hand to notify proper authorities of your intentions. I find that this often makes things happen, just writing the letter. There is a standardized process to do this, and the information is available (although, unfortunately I cannot tell you where to get this). I attended a seminar on this in Pittsburgh a few years back and they gave all the information out, but stated that it is available on the net.