Jefferson Chamber of Commerce Terracon Consultants Inc. Share: EngineeringEnvironmental Terracon Consultants Inc. Visit Website 524 Elmwood Park Blvd. Harahan, LA 70123 (504) 818-3638 Hours: Office Hours: 8am-5pm, Monday-FridayOperational Hours: 24 hours per day, 7 days per week About Map About Terracon is a 100% employee-owned consulting engineering firm, specializing in environmental, facilities, geotechnical, and materials services. Terracon currently has more than 5,000 employees in more What's Nearby? Distance: 5 10 15 20 25 50 mi.