If you have it chipped, there's a couple of places that I know of around Indy...
First is TIffany's. Seems like every time I went in there (when I was still working over there), there was at least 1-2 bucket/chip trucks that came in to dump. Don't know if it's a free dump or charged, or if they are even still taking chips.
Second place I know of is Green Cycle. They have two locations, one at I-65 and 267 (B'burg exit- exit #133 or 137-- you'd think I'd remember after going through that intersection 5-6 days a week for a year....) on the SE corner. Also have a location on Hanna(?), a few blocks west of Bobcat of Indy (Bluff road store). I'm pretty sure there's a charge for dumping there.