Investor Presentaiton

9 EXCELLENCE INNOVATION PEOPLE GROWTH STN TSX NYSE Environmental Services Q4 19 YTD Organic net revenue growth 13.2% 13.1% Net revenue growth 15% of Consolidated Net Revenue 12.9% 18.1% Lower Powers Creek West Kelowna, British Columbia Net revenue by sector ■Transportation Mining ■Community Development ■ Buildings Net revenue by geography ■ Global ■ Canada ■ Power ■ Water ■ Private ■ Public ■ Oil & Gas ■ United States

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