Park spokesman Al Nash says a 23-year-old man on Tuesday was fined $750 and placed on three years of unsupervised probation for urinating, being off trail in a restricted area and taking items from the area. The man also was banned from Yellowstone for two years.
The second employee's case is pending.
The park's dispatch center was called after someone watching a webcam on the geyser saw six employees leaving the trail and walking on Old Faithful on May 4.
The geyser was not erupting at the time.