POWER OF ATTORNEY

       	Know all by these presents, that the undersigned hereby
constitutes and appoints each of Chris Miller, Ann Lucchesi, Matt
Tachouet, Veronica Sanchez and Anthea Fernandes, or either of them
signing singly, and with full power of substitution, the
undersigned's true and lawful attorney-in-fact to:

 (1)	execute for and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director
of Core-Mark Holding Company, 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;

(2)		do and perform any and all acts for and on behalf of
the undersigned 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

(3)	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, it being understood that the documents
executed by such attorney-in-fact on behalf of the
undersigned 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 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 be 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 attorneys-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 Securities Exchange Act of 1934.

       	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4, and
5 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
attorneys-in-fact.

       	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 23 day of May, 2017.


	 /s/Jordana Daryl
Kammerud  			Signature

		Jordana Daryl
Kammerud
			Print Name





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WEIL:\95721002\2\39021.0001
 to be executed as of this 23 day of May, 2017.


	 /s/Jordana Daryl
Kammerud  			Signature

		Jordana Daryl
Kammerud
			Print Name





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