You are one lucky man to have all that knappable material right in your own backyard!
Not to mention all the other miscellaneous rock you might find.
I would HIGHLY recommend you create some out-of-the-way special area out by your
shop, or somewhere, for knapping and your new rock collection hobby. Not so much
because the chips and flakes would slice your tires, but more because you don't want to
create a mound you have to drive over to get to your shop! I think you will be amazed
to discover how much refuse is created trying to make even the smallest points and how
quickly your pile of rocks will grow. It would probably be best to keep it all together and
out of the way. You don't want to have to move those rocks around very often either.
Have Fun,
Joe