I have been planning to build a small hugel mound on a hill, about 3 feet below a 100 gallon propane tank. Is the presence of the tank anything to be concerned about? Is there a risk of anything toxic leaking down to the bed? The hill faces west, the east is shaded by tall trees. I want to make the bed crescent shaped with the belly facing west, down the hill, so the bed catches water flowing down the hill from above. I am concerned that this shape might also trap cold air flowing down the hill from the shadey east. I also wonder if the propane tank will make the bed colder. I want to make the hugel bed a few feet high, and place a wattle screen in front of the propane tank so it is not visible from the west. Thanks for any input.
Only issues would be if the propane company decides to do maintenance on the tank. Usually soap and paint, but possibly some bug or weed killer.
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The only other thing that might be worth checking is that the placement of the tank is up to "code". The place I live changed some regulations about the tank placements and ours had to be moved 10 feet further away than it was from our dryers duct work. Nothing was in the way but, I'd be miffed if I had food growing there. Just double check to save yourself the headache.