Question
I have an area of land approximately 12,000 sq feet that was recently cleared
of brush, etc.  However there is a ridiculous amount of rocks that are
preventing me from being able to plant grass.  If I were to remove all of the
large rocks from the site and left the smaller rocks, could I just get a large
amount of topsoil to bury them?  How much depth of topsoil would I need to
be able to plant grass?

Answer
Hi Chris, I'd want a minimum of 8".  The soil needs to be the same type soil you have, except without the rocks.  You do not want to use a different type or texture of soil.  It will create a watering nightmare.  Also, if there are roots from desirable trees in the area, you cannot add soil on top of their rootzone.  It will damage or kill the trees.
If it were mine, I'd remove the large rocks, till it, rake it out and sow your grass seed at the appropriate time and not add any additional loose soil that may wash.  Jim