From the Richland Police Facebook page:

James Adams, 71 and Tyler Buntin, 25 were in a verbal altercation at the gravel parking area between the baseball fields and dog park on Keene Road. James was in possession of a firearm that he fired into the ground. The altercation became physical and Buntin was shot in the foot, while taking possession of the firearm. Both parties then left the location and were treated at separate hospitals for injuries.

The investigation is ongoing and the dog park is open for use.