A submerged tugboat in the Empire Tract area of San Joaquin County was leaking fuel and oil into the Delta waterway on Monday morning, according to the sheriff’s office. The boat was near Herman and Helen’s Marina, the San Joaquin County Sheriff’s Office said. The sheriff’s office boating safety unit went to the scene trying to contain the spill. Outside agencies — including Environmental Health, Office of Emergency Services, Fish & Wildlife, Woodbridge Fire Department, and the U.S. Coast Guard Pollution Response Team — were also contacted to assist in the spill.