Boskalis CSR report 2017

Appendix CSR 2017 – BOSKALIS 78 INDEPENDENT LIMITED ASSURANCE STATEMENT To the Stakeholders of Royal Boskalis Westminster N.V. Introduction and objectives of work Bureau Veritas Inspection & Certification The Netherlands B.V. (Bureau Veritas) was engaged by Royal Boskalis Westminster N.V. (Boskalis) to provide limited assurance over selected performance indicators to be presented in its Corporate Social Responsibility Report 2017 (“the CSR Report”). This Assurance Statement applies to the related information included within the scope of work described below. Scope of work The scope of our work was limited to assurance over the following information included within Boskalis’ CSR Report for the period 1st of January to the 31st of December 2017 (the “Selected Information”): ‚ ‚ Direct greenhouse gas (GHG) emissions and fuel consumption (MGO/MDO) from the fleet; ‚ ‚ Number of employees broken down by: - employment contract (permanent or temporary contract) and by gender; - employment type (part-time, full-time) and by gender; - country and number of nationalities; ‚ ‚ Inflow and outflow of employees broken down by age (<30, 30-50, >50) and gender, and outflow by reason; ‚ ‚ Percentage of employees covered by collective bargaining agreements broken down by gender; ‚ ‚ Composition of workforce broken down by gender and by age (<30, 30-50, <50); ‚ ‚ Number of training hours broken down by gender and by job category (management, office staff, project staff, crew/yard staff); ‚ ‚ Talent management and engagement; ‚ ‚ Lost Time Injury Frequency (LTIF) and Total Recordable Injury Rate (TRIR); ‚ ‚ Number of LTIs and fatalities; ‚ ‚ Prevention of occupational and other diseases; ‚ ‚ Spend represented by strategic suppliers; and ‚ ‚ Percentage of strategic suppliers who have signed the Boskalis Supplier Code of Conduct. Limitations and Exclusions The scope of the verification work did not include information relating to activities outside the defined reporting period, statements of a descriptive or interpretative nature, or of opinion, belief, aspiration or commitment to undertake future actions. This limited assurance engagement relies on a risk based selected sample of CSR data and the associated limitations that this entails. The reliability of the reported data is dependent on the accuracy of metering and other production measurement arrangements which is not addressed as part of this assurance. This independent statement should not be relied upon to detect all errors, omissions or misstatements that may exist. Responsibilities The preparation and presentation of the Selected Information in the CSR Report are the sole responsibility of the management of Boskalis. The responsibilities of Bureau Veritas were to: ‚ ‚ Obtain limited assurance over the Selected Information; ‚ ‚ Form an independent conclusion based on the assurance procedures performed and evidence obtained; and ‚ ‚ Report our conclusions to the Board of Management. Assessment Standard We performed our work in accordance with International Standard on Assurance Engagements (ISAE) 3000 Revised, Assurance Engagements Other than Audits or Reviews of Historical Financial Information (effective

for assurance reports dated on or after December 15, 2015), issued by the International Auditing and Assurance Standards Board. Summary of work performed As part of our independent verification, our work included: 1. Conducting interviews with relevant personnel of Boskalis; 2. Reviewing the data collection and consolidation processes used to compile the Selected Information, including assessing assumptions made, collection processes, and the data scope and reporting boundaries; 3. Reviewing documentary evidence produced by Boskalis; 4. Confirming the accuracy of a selection of the Selected Information to the corresponding source documentation; 5. Reviewing Boskalis systems for quantitative data aggregation and analysis; 6. Performing analytical procedures of the Selected Information; 7. Re-performing aggregation calculations of the Selected Information; and 8. Assessing the disclosure and presentation of the Selected Information to ensure consistency with assured information. Conclusion On the basis of our methodology and the activities described above, nothing has come to our attention to indicate that the Selected Information is not fairly stated in all material respects. Statement of Independence, Integrity and Competence Bureau Veritas is an independent professional services company that specialises in quality, environmental, health, safety and social accountability with over 185 years’ history. Its assurance team has extensive experience in conducting verification over environmental, social, ethical and health and safety information, systems and processes. Bureau Veritas operates a Quality Management System which complies with the international standards and accordingly maintains a comprehensive system of quality control including documented policies and procedures regarding compliance with ethical requirements, professional standards and applicable legal and regulatory requirements. Bureau Veritas has implemented and applies a Code of Ethics, which meets the requirements of the International Federation of Inspections Agencies (IFIA)1, across the business to ensure that its employees maintain integrity, objectivity, professional competence and due care, confidentiality, professional behaviour and high ethical standards in their day-to-day business activities.

The assurance team for this work does not have any involvement in any other Bureau Veritas projects with Boskalis.

Bureau Veritas Inspection & Certification The Netherlands B.V.

Sebastiaan ter Horst, CER Director Benelux & UK Amersfoort, 7 March 2018

1 International Federation of Inspection Agencies – Compliance Code – Third Edition