Seeing as how my lawn is burning up for the lack of water due to the water company recommended 3 day max on watering I'd gladly wash my car on the lawn if I could but that would require me to cut down a 30 year old pine tree and that would probably get the tree huggers on my case! Moozooma, this is how the fire marshall explained it. We were filling in some old gas tanks at my old shop, we couldn't remove them (building was over them) so the EPA guy gave us a permit to fill them in place with sand. Fire marshall insisted they be fill with concrete instead of sand. when the contractor asked where that requirement was written the guy said it wasn't but he had the authority to require what "he" determined nessasary on a case by case basis. Could we of fought it, sure, but that would of shut down the whole operation for months and I couldn't afford to wait since I had a big hole blocking the bay doors. When asked why he thought it needed concrete he said so we wouldn't be tempted to dig the sand out and start using the tanks again! Good logic again.