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Architecture & Engineering

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March 3, 2021

Mayes Terracon



Mayes Terracon promoted Heath Defoor to principal and Mark Gordon to department manager for its Tacoma office. Defoor will take over the Seattle materials testing and inspection services group, replacing Mike Dolder, who is retiring after 30 years with the firm. Mike Mayes and Tim Beckerle will continue to support Defoor as senior consultants. Defoor has 18 years of experience including the last seven with Mayes Terracon as senior project manager and department manager. He has worked on projects in the Northwest, including the Lincoln Square expansion, 2+U, Expedia Seattle Headquarters Campus, Microsoft Refresh Campus and 333 Dexter. Gordon manages materials testing, laboratory quality control, safety programs and field staff. He is a WABO registered technical director, special inspector and lab and field supervisor. He has over 25 years materials testing and inspection experience with 20 at Mayes Terracon, a consulting engineering firm that provides environmental, facilities, geotechnical and materials services.

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