LAKE ARROWHEAD, Calif. He was last seen wearing a white shirt, khaki pants, snow boots and a beanie hat. Anyone with information is asked to call the San Bernardino County Sheriff’s department at (909)387-8313. He did not bring a phone or other personal property with him. (KABC) — A search was underway Saturday for the son of San Bernardino County Fire Chief Mark Hartwig.Dawson Hartwig, 20, was last seen around 5 p.m. Friday when he left for a walk from a rented cabin near Lake Arrowhead. Rescue crews and volunteers are searching the area near the lake as well as a dive team looking in the lake itself.Hartwig is described as 6 feet 4 inches, 160 pounds, with blonde hair and brown eyes.