Hi! I read with interest your question about using asphalt grindings for your arena base. I’m on the east side of the Cascades and do not have access to rock smaller than 5/8" but due to road construction nearby, I can get recycled asphalt that my contractor will roll. What did you decide to do for your outdoor arena? Thanks. Keelyn

We ended up doing no base, with the exception of 5/8- in any low areas. We had a pretty good draining clay/sand mix and didn’t want to disturb it too much. It was MUCH cheaper and I am very happy with the return on investment. To be fair, though, our arena has pretty good slope to help with runoff and has great draining soil. I do know of several people with asphalt bases, either hot rolled or just cold compacted.