Terracon continues growing with acquisitions



Photo by americasroof / Wikimedia Commons / Terracon was retained by KCPL to provide construction observation and testing services for the Iatan 2 Power Plant construction project near Weston, Mo.


Olathe, Kan.-based Terracon, a leading provider of environmental, facilities, geotechnical and materials services, this week announced the acquisition of two companies on opposite ends of the country.

Terracon said it had acquired Mayes Testing Engineers of Lynnwood, Wash., retaining all 115 Mayes employees. It also acquired ROC Geotechnical Consulting Engineers of Rochester, N.Y., That four-person firm offers geotechnical and soils testing capabilities.

Terracon now has more than 130 offices from coast to coast.

Mayes Testing Engineers was formed in 1991 through acquisition of Boss Testing, originally established in 1984. Locally owned and operated for the past 25 years, Mayes is known as one of the largest providers of construction quality-assurance services in the Pacific Northwest with in-depth welding, concrete, soils, masonry, asphalt and non-destructive testing experience.

“This acquisition allows us to significantly expand our presence and service offering in the Pacific Northwest,” said David Gaboury, P.E., president and CEO of Terracon. “We believe Mayes’ materials expertise and local area knowledge complement our existing services and enhance the value and depth of resources we bring to our clients regionally and nationally.”

The transition is effective immediately. The company operates as Mayes Testing Engineers, A Terracon Company.

The Mayes team provides special inspections, materials testing, condition surveys and other materials consulting for owners, developers, architects, contractors, and structural engineers.

“This is a great opportunity for our company, our employees and our clients,” said Michael Mayes, president of Mayes Testing Engineers. “Joining forces with a nationwide leader like Terracon allows us to provide additional services, including geotechnical, environmental and building envelope consulting to our regional clients.”

Terracon’s expansion brings together the acquired resources of Mayes, RGA Environmental, and Argus Pacific, all in the Pacific Northwest. Terracon companies now combine to include six Seattle/Tacoma and two Portland, Ore., locations. The move also becomes Terracon’s fifth acquisition in the western United States in the past two years, having also acquired NORCAL Geophysical Consultants and Neil O. Anderson and Associates.

The ROC acquisition allows Terracon to further strengthen its service offerings and geographic presence in Rochester and across upstate New York. Terracon’s existing Rochester location opened in 2015 and has grown to 20 employees. Employees from both offices will remain at their current locations before eventually integrating into one office.

“This opportunity allows us to further strengthen our presence in the area and draw upon the excellent regional history and reputation of an established upstate New York firm,” said David Gaboury, Terracon’s president and CEO. “Gaining this area expertise aligns with our commitment to bring even greater resources to our clients.”

With more than 70 combined years of geotechnical experience, the partners of ROC formed the company in 2011 through an acquisition of Tierney Geotechnical Engineering. ROC’s services include subsurface exploration, geotechnical engineering-design recommendations and laboratory analyses and geotechnical field-inspection services.

ROC services clients across the public and private sectors and boasts a project history spanning across the commercial, healthcare, energy and government markets.

“ROC has an incredible background in the region, having provided services on countless recognizable projects,” said Bob Pavlicek, Terracon’s northeast division manager. “Gaining these resources helps us provide clients with cost-effective consulting supported by powerful, site-specific information and regional expertise.”