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EXHIBIT A <br />Written onsent of the Board of Directors .in Lieg of an Annual ele� <br />dated June 1 2017 <br />FURTHER RESOLVED, that Melanie Lefebvre ("Lefebvre"), Christina Imbrogno <br />("Imbrogno") and Tammy Yergey ("Yergey"), as authorized persons, are hereby authorized, <br />empowered and directed, by and on behalf of the Corporation to execute and deliver in the name <br />and on behalf of the Corporation product bids and product contracts for the sale of inorganic <br />coagulants for the Industry and Water Segment, excluding industrial customers for oil and gas <br />applications. <br />A-1 <br />