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Investor Presentaiton

33 EXCELLENCE INNOVATION PEOPLE GROWTH STN TSX NYSE United States millions (C$) $700 $3,000 $600 $2,500 $500 $2,000 $400 $1,500 $300 $1,000 $200 $100 $500 $0 $0 Q4 19 Q4 18 2019 2018 Gross Revenue Net Revenue Quarterly Highlights Continued growth in Transportation, Environmental Services, and Water Ramp-up of renewable Power projects Increased midstream Oil & Gas projects Martin County, Florida Substation Lake Mary, Florida Net revenue growth Q4 19 FY 2019 9.5% 9.8% Organic net revenue growth 9.6% 7.0% Backlog at December 31, 2019 $2.6B

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