ONQUEST TO DESIGN KHT HEATER
FOR MARATHON AT CANTON REFINERY

Second Win of Furnace Retrofit after Success at Marathon Garyville

Los Angeles, CA (August 28, 2012) Marathon Petroleum Co. L.P., has chosen San Dimas, Calif.-based OnQuest, Inc. to provide engineering design and procurement for the retrofit of the kerosene hydrotreater heater (KHT heater) at Marathon's Ohio Refining Division in Canton, announced OnQuest's president & CEO Randy Kessler today.

OnQuest is a world leader in revamps and retrofits of combustion units used in various applications in the chemical and petrochemical refining industry. The company won the Canton project in early July after conducting an on-site review and appraisal of the KHT heater earlier in the year, recommending a retrofit that would replace the supports in the radiant and convection sections and the coils in the convection section.

"This win at Marathon Canton follows our successful retrofit for the company at its massive Garyville facility in Louisiana," said Kessler. "It reflects Marathon's confidence in OnQuest's technical expertise, our deep familiarity with these types of heaters, and our success rate in effecting revamps and retrofits in tight turnaround times."

OnQuest will provide procurement and supply services alongside the engineering, and will oversee the retrofit.

Established in 2002, OnQuest engineers and designs specialized process plants for the new world of energy production, including for LNG, waste-to-energy, hydrogen and syngas plants. OnQuest has expertise in execution from engineering and design to delivery, including procurement, turnkey project management and construction supervision. OnQuest also designs direct-fired heaters and waste heat recovery units, burner management systems and other clean-air and NOx reduction technologies.

OnQuest's principal offices are in San Dimas, Calif., and Calgary, Alberta, and the company has sales and project offices in Houston, Tex., and San Francisco, Calif. OnQuest has sales representatives worldwide. OnQuest is a subsidiary of Primoris Services Corporation (NASDAQ: PRIM), one of the nation's largest specialty civil construction companies.