Site Works Execution All site works are performed under the supervision of De Smet Engineers & Contractors (DSEC) specialists headed by the Site Manager who is in permanent contact with our project management staff in order to constantly monitor quality, and compliance with the budget and timetable of all on-site sub-contracted work. At construction completion, the Site Manager will organise start-up and commissioning procedures with the help of in-house start-up engineers and vendor specialists.