ROXAS, Isabela – A 40-year-old missing barangay watchman was found dead inside a concrete septic tank in a farm in Barangay San Placido here on Friday, Aug. 7.Police said the victim, Allen, was discovered after they received information about his possible whereabouts.Police Major Christian Caoile, chief of the Roxas Municipal Police Station, said responders excavated a portion of the septic tank recently covered with gravel and sand.The victi…