Frontier-Kemper JV Receives Notice to Proceed with the CAD$337 Million Kemano Generating Station T2 Tunnel Project

LOS ANGELES–(BUSINESS WIRE)–Tutor Perini Corporation (NYSE: TPC), a leading civil, building and
specialty construction company, today announced that a joint venture
between its subsidiary, Frontier-Kemper Constructors, and Aecon Group
Inc., of which Frontier-Kemper has a 60% share, has received Notice to
Proceed from Rio Tinto for a contract valued at approximately CAD$337
million (USD$274 million) to complete the construction of the remaining
7.6-km section of a 16-km second tunnel at the Kemano Generating Station
in British Columbia. The contract value was included in the Company’s
third quarter 2017 backlog.

The project’s scope of work includes the excavation and boring of new
tunnel segments, tunnel lining, rehabilitation of existing underground
and surface excavations, and installation of intake gates and other
related structures. Design work is progressing with site activities to
commence in late first quarter 2018. The project is expected to reach
completion in the third quarter of 2020.

“We are pleased to work with Rio Tinto on this important project,”
remarked Dave Rogstad, President and CEO of Frontier-Kemper
Constructors. “The project represents our fifth major tunneling project
in British Columbia over the past 12 years, and we look forward to
delivering an outstanding project.”

About Frontier-Kemper Constructors

Frontier-Kemper Constructors, Inc. is a widely recognized leader in
underground and heavy civil construction. Frontier-Kemper builds tunnels
and shafts for highways, mass-transit systems, railroads and
hydroelectric plants, and facilities for water supply and wastewater
transport. In addition, Frontier-Kemper develops and equips underground
mines for coal, salt, copper, gold and other minerals.

About Tutor Perini Corporation

Tutor Perini Corporation is a leading civil, building and specialty
construction company offering diversified general contracting and
design-build services to private clients and public agencies throughout
the world. We have provided construction services since 1894 and have
established a strong reputation within our markets by executing large,
complex projects on time and within budget while adhering to strict
quality control measures.

Contacts

Tutor Perini Corporation
Jorge Casado, 818-362-8391
Vice
President, Investor Relations & Corporate Communications
www.tutorperini.com