mmcoal wrote:I know we have gone over coal ash uses, but does anyone know if it is actually safe to keep spreading in a driveway or in a pile in the backyard? Doesn't it produce acid when it gets wet? I have plenty of areas on my property for the ashes, but I want to make sure it won't hurt my ground water in the long run. Thanks, Chris
Yes I think coal ash is somewhat acidic. I used it for years as driveway filler and a traction agent, and never noticed any problems. If you're concerned, I think in a driveway increased acidity can be counteracted by occasional use of calcium carbonate-based ice melt. In the yard or garden, maybe a little baking soda or lime? I'll defer to to a chemist or anyone with real info or experience.