POWER OF ATTORNEY

The undersigned (the "Reporting Person") hereby constitutes and
appoints Cynthia M. Durrett, Kyle S. Ramachandran and Christopher
M. Powell, and each of them, as the Reporting Person'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 or any rule or
regulation of the SEC;

(2)  execute for and on behalf of the Reporting Person, in the
Reporting Person's capacity as an officer or director of Solaris
Oilfield Infrastructure, Inc. (the "Company"), Forms 3, 4 and 5
in accordance with Section 16(a) of the Securities Exchange Act
of 1934 and the rules thereunder;

(3)  do and perform any and all acts for and on behalf of the
Reporting Person which may be necessary or desirable to complete
and execute any such Form 3, 4 or 5, complete and execute any
amendment or amendments thereto, and timely file such form 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 Reporting Person, it being understood that the
documents executed by such attorney-in-fact on behalf of the
Reporting Person pursuant to this Power of Attorney shall be in
such form and shall contain such terms and conditions as such
attorney-in-fact may approve in such attorney-in-fact's
discretion.

The Reporting Person grants to such attorney-in-fact full power
and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein granted, as fully
to all intents and purposes as the Reporting Person might or
could do if personally present, with full power of substitution
or revocation, hereby ratifying and confirming all that such
attorney-in-fact shall lawfully do or cause to be done by virtue
of this Power of Attorney and the rights and powers herein
granted.  The Reporting Person acknowledges that the foregoing
attorney-in-fact, in serving in such capacity at the request of
the Reporting Person, is not assuming, nor is the Company
assuming, any of the Reporting Person's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in effect until the Reporting
Person is no longer required to file Forms 3, 4 and 5 with
respect to the Reporting Person's holdings of, and transactions
in securities issued by, the Company, unless earlier revoked by
the Reporting Person in a signed writing delivered to the
attorney-in-fact.



IN WITNESS WHEREOF, the Reporting Person has caused this Power of
Attorney to be executed on August 13, 2018.



/s/ Ray N. Walker, Jr.
Name: Ray N. Walker, Jr.