You probably wont run into any trouble. But, that's only because no-one else will be there! I talked to Bitterend about pipeline a little on the 21st, and he said he did talk to the right people and found that the peirce co parks dept. is not going to allow this at all ("not even squirt guns!")! He did say he'd pass on the names and numbers if you want to try your self. You might also talk to Micha from TAC, I know he's been working on this as well. Good luck!