I'll throw another recommendation for switching to a maul. A sledge on wedge is a piercing sound, and while I think the whole situation is ridiculous, that does definitely travel farther than the swish of a maul thru wood. Unfortunately, a maul is usually not the best way to tackle real big stuff, so you'll be saving your larger rounds until the weekend, when you can go back to wedge and sledge. I'll point out also that, technically, you're not doing "yard work". Splitting wood for heat has nothing to do with maintaining your yard. So, if the ordinance is written with respect to mowing, trimming, and general yard work, it does not apply.