Ok, DH doesn't think the septic tank is an issue. Here's what you do: Block up all the holes (with rocks or something) but one. At the one open hole, you need to reach in a ways and place a little tray of foil. Pour a cup or so of gasoline into the tray, and then block the opening with a large wadded up plastic bag. Go away for 20 minutes or so (you are making fumes). Now you are going to remove the plastic bag, and standing away from the hole (at an angle where you are shielded if someone were to throw a projectile out of the hole), you are going to throw a lit match and run away.
DH then adds, "please DON'T TELL ANYONE I told you to do this! It is dangerous and probably illegal (and very effective). Never stand in front of the hole, where the fire rocket will exit."
I believe if your neighbors see you doing this, they might think you are a true native.![]()
Seriously, though, you should probably just stick with your 22.