Orhun Serhat Yarar

Jan De Nul, Al Omairah Project, UAE
Dates (e.g., Jan 2023 – Present)

• Leading the execution of rock and Accropode™ II installation works for a major marine infrastructure project, overseeing a multidisciplinary team of ~200 personnel, including 8 superintendents across three subteams: rock installation, Accropode™ II installation, and stockpile management.
• Developed and implemented weekly work plans in coordination with the Construction Manager, aligning daily operations through regular briefings with superintendents and team leaders.
• Managed workforce planning and recruitment in collaboration with the HR department; assigned manpower, equipment, and materials according to evolving project needs and work zones.
• Supervised all rock and Accropode™ II installation activities, ensuring adherence to planning, technical drawings, tolerances, and specifications, including coordination with the CLI team for 3D model verification (Seabim software).
• Coordinated inspections and obtained client approvals for completed works; maintained close interface with engineering, workshop, logistics, and other departments for seamless execution.
• Oversaw stockpile operations and material movement planning; prepared 7-day lookahead schedules for rock and Accropode™ II deliveries to offshore locations.
• Participated in daily coordination meetings with project management team and client (ADNOC), reporting progress, resolving issues, and aligning on execution strategies.
• Ensured full compliance with HSE standards by conducting routine safety inspections and promoting a proactive safety culture across all teams.

• Overall management of the main breakwater caisson superstructure construction which consist of wave wall, slab, and three oil terminal berths with a total of 72.500 m3 concrete production.
• Preparation of monthly and weekly work plans in accordance with the contractual schedule.
• Monitoring the progress of the works by visiting the site regularly on daily basis, taking the necessary actions to ensure that the work continues according to the planning.
• Attending meetings with project management and the client, providing information on the work schedule, progress and technical issues.
• Leading a team of 210 personnel in total including 2 site engineers, 3 site technician, foreman and workers.
• Assisting in the preparation of method statements and technical documents in coordination with the technical office.
• Keeping track of material stock and orders to ensure an efficient work flow.
• Conducting safety inspections in coordination with project HSE team in order to ensure a safe work environment for the site team.
• Implementing quality guidelines in coordination with project QA/QC team.

The installation of a total of 148 caissons (two different types of caissons with weights of 8500 tons and 6000 tons), which constitute the part of the main breakwater between PM 1508 and PM 4238 meters, was successfully completed two months ahead of the project schedule.

The summary of the critical duties as caisson transfer and installation manager is given below:

• Managed the end-to-end transfer and installation operations of large precast concrete caissons (each measuring 30 m x 20 m x 25.5 m and weighing approx. 8,500 tons), forming the main breakwater structure of the port. Scope included coordination of all related marine engineering studies such as ballasting procedures, stability analyses, towing/mooring arrangements, and naval simulations, in collaboration with international marine consultants.
• Oversaw the design and implementation of temporary marine structures including access platforms, winch supports, and pump rack systems.
• Developed detailed operational plans aligned with weather forecast windows to optimize execution during favorable sea conditions.
• Coordinated all preparatory activities such as caisson skidding, top-side equipment installation, anchor positioning, marine vessel allocation (tugboats, barges), and client inspections.
• Prepared and managed the caisson towage plan to ensure smooth integration with other concurrent marine activities.
• Participated actively in all towage operations, ensuring strict compliance with approved procedures.
• Supervised the entire liquid ballasting process of both semi-submersible barge and the caisson, ensuring precise execution per engineering specifications.
• Led final positioning and setting of caissons, achieving required tolerances and alignment with seabed installation criteria.
• Ensured full adherence to HSE standards throughout all marine operations, implementing proactive risk mitigation strategies.

As marine works superintendent, supervised and controlled the offshore vibrocompaction works with the below listed tasks:

• Supervision of the execution of vibrocompaction works (with a total quantity of 7.500.000 m3) and CPT tests.
• Preparation of the work plans and organizing the barge positions in coordination with the marine base team and soil improvement works subcontractor.
• Checking the progress payment documents and analyzing the claims of the subcontractors.
• Obtaining the required work permits from the client.
• Preparation of the purchase orders for the necessary materials.

• Organizing and planning breakwater construction activities in coordination with construction manager by following up weather forecasts, as project location was open to adverse sea conditions in Atlantic Ocean.
• Supervising the placement and profiling works of core (1-500 kg), armour rock (0,5-1,5 t/1-2 t/2-4 t/4-6 t) materials and placement of the Accropode and Antifer blocks with Echoscope® 3D sonar system.
• Following and organizing the soil improvement activities at site, in coordination with subcontractor team (Keller Foundations).
• Keeping all site records for potential contractual claims.
• Determining the requisition of materials, consumables and making the purchase orders accordingly.

• Prepared the contract documents of awarded tenders of subcontractors.
• Analyzed the claims of subcontractors and reported to contract manager.
• Attended the contract meetings to reach agreements with the subcontractors in contractual claims.
• Controlled the progress payments of subcontractors in terms of contractual aspect.

As site engineer supervised the site activities such as:

• Driving of inclusion piles to improve the soil conditions below the north and south tower foundations (195 pieces for each foundation, 34,25 m in length and Ø2000 mm in diameter).
• Removal of Temporary Dry Dock (for Caisson Fabrication) (Extraction of 517 numbers of sheet piles by using vibratory hammer.)
• Deep excavation for North Anchorage Structure (22 meters of excavation height at its deepest locations).
• Soil Improvement (by Jet Grouting method) works for North Side Span Pier Structure

• Organization and supervision of the soil investigation works at various construction sites in Turkey and Azerbaijan.