ONQUEST APPOINTS RANDY KESSLER AS PRESIDENT AND CEO

Experienced Executive Returns to Lead Specialized Combustion Technology Firm

Los Angeles (June 4, 2012) - San Dimas, Calif.-based OnQuest, Inc., a leader in furnace and process technologies for the petroleum and petrochemical industry, has appointed Randolph R. Kessler as President and Chief Executive Officer.

From 2002 to 2010, Kessler was Director of Sales & Marketing for OnQuest, with primary responsibility for the full range of OnQuest's business development and marketing activities, including researching opportunities, client relationship management and proposal management.

He returns to OnQuest from the U.S. operations of global engineering firm Worley Parsons, where he was Vice President - Hydrocarbons from 2011 to 2012, a role primarily focused on client relations and services to companies involved in downstream refining operations.

"We are pleased that Randy Kessler has rejoined OnQuest as its new president and CEO," said Brian Pratt, chairman, president and chief executive officer of Primoris Services Corporation (NASDAQ: PRIM), OnQuest's parent company. "Not only does Randy bring deep experience in furnace and combustion technology from a career in the business, but he also is intimately familiar with OnQuest's clients and our corporate organization."

Kessler joined OnQuest as a principal at the company's inception in April 2002. Prior to joining OnQuest, he held direct sales and client relationship management roles with Los Angeles-based petroleum engineering and construction firm KTI Corporation. At the time of his departure from KTI, Kessler was Vice President of KTI's sales force, reporting directly to the company's CEO.

Prior to his joining KTI in 1985, Kessler was a furnace process engineer for CF Braun, where he also served as a member of the Task Force for the Refinery Modernization and Expansion of Kuwait National Petroleum Company's Mina Abdulla Refinery.

An active member of industry engineering societies, including the American Petroleum Institute, the American Institute of Chemical Engineers, the Gas Processors Suppliers Association, the Pacific Energy Association, and the National Petrochemical & Refiners Association, Kessler was born in New York City and attended Rutgers University, receiving his B.Sc. in Chemical Engineering in 1982. In 1997, he completed the Advanced Management Program at the University of California at Berkeley.