The Citgo Petroleum Refinery in Lake Charles, Louisiana is one of the largest producers of gasoline in the United States. For the Substation 70 project, Advanced Engineering Resources provided civil and structural design associated with the upgrade of electrical equipment in an existing refinery process unit. AER designed a 4000 square foot switchgear building, new cable tray support structures over plant roads, cable tray road trenches and numerous additions and modifications to existing structures to accommodate new cable trays installed throughout the process unit.