Investor Presentaiton

9 SOCIAL AND ENVIRONMENTAL RESPONSIBILITY We are highly focused on investing in our workforce, health and safety programs, social initiatives, and improvements to our environmental stewardship. Health & Safety Diversity & Inclusion Environmental Stewardship • • • • Compliance-driven approach Industry-leading safety performance over the last four years1 • Average total recordable incident rate: 2.48 Average days away rate: 0.52 Proactive and precautionary COVID-19 measures in place Comprehensive Employee Assistance Program ("EAP") Monthly Safety Plan Meetings, 'No Days. Away' Safety Awards, and employee Safety Day Strive for continuous improvement ☐ Northwest Pipe Company • Focused on recruiting diverse leadership across the Company • 46% of U.S. employees from underrepresented racial/ethnic groups 11% of U.S. employees are female Affirmative Action Program with goals for equal representation in the markets in which we operate • Strive to ensure pay equity for all • • • Continuing to invest in improvements to drive efficiencies and reduce carbon footprint • Enhanced coating and lining. processing to reduce emissions Upgraded facility lighting Comply with environmental laws and regulations while minimizing waste employees regardless of identity Aim to increase transparency on employee representation Note: As of December 31, 2021. 1. Calculated in accordance with the Occupational Safety and Health Administration's record keeping requirements.

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