POWER OF ATTORNEY

	Know all these presents, that the undersigned hereby
constitutes and appoints Brian Pratt, Chief Executive Officer,
Peter J. Moerbeek, Chief Financial Officer, John P. Schauerman,
Executive Vice President, and John M. Perisich, Senior Vice
President of Primoris Services Corp., a Delaware corporation (the
"Company"), with full power of substitution, as the undersigned's
true and lawful attorney-in-fact to:


1.	prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and
Exchange Commission (the "SEC") a Form ID, including
amendments thereto, and any other documents necessary or
appropriate to obtain codes and passwords enabling the
undersigned to make electronic filings with the SEC of reports
required by Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Act"), Rule 13d-1 of the Act, or any
other rule or regulation of the SEC;


2.	execute for an on behalf of the undersigned, in the
undersigned's capacity as an officer, director, or stockholder
of the Company, Forms 3, 4 and 5 in accordance 3 with Section
16(a) of the Act and the rules thereunder, Schedules 13D and
13G in accordance with Rule 13d-1 of the Act, and any other
forms or reports the undersigned's may be required to file in
connection with the undersigned's ownership, acquisition or
disposition of securities of the Company;


3.	do and perform any and all acts for and on behalf of the
undersigned's which may be necessary or desirable to (i)
complete and execute any such Form 3, Form 4, Form 5, Schedule
13D, Schedule 13G or other forms or reports the undersigned's
may be required to file in connection with the undersigned's
ownership, acquisition or disposition of securities of the
Company, (ii) complete and execute any amendment or amendments
thereto, and (iii) timely file such forms or reports with the
SEC and any stock exchange or similar authority; and


4.	take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-
fact, may be of benefit to, in the best interest of, or
legally required by, the undersigned's, it being understood
that the documents executed by such attorney-in-fact on behalf
of the undersigned's pursuant to this Power of Attorney shall
be in such form and shall contain such terms as such attorney-
in-fact may approve in such attorney-in-facts discretion.


       The undersigned hereby grants to each such attorney-in-fact
full power and authority to do and perform any and every act and
thing whatsoever requisite, necessary, or proper to done in the
exercise of any of the rights and powers herein granted, as fully
to all intents and purposes as the undersigned might or could do
if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of
this Power of Attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorney-in-fact,
in serving in such capacity at the request of the undersigned, are
not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the
Act, Rule 13d-1 of the Act, or any other rule or regulation of the
SEC;


       This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file reports
required by the Act with respect to the undersigned's holdings of
and transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorney-in-fact.


       IN WITNESS WHEREOF, the undersigned's has caused this Power
of Attorney to be executed as of April 14, 2010.


/s/Michael D. Killgore
Michael D. Killgore