Exhibit 10.19

ASSUMPTION AND INDEMNITY AGREEMENT

This Assumption and Indemnity Agreement made as of December 18, 1992 by and
between Interprovincial Pipe Line Inc. (“IPL”) and Interprovincial Pipe Line
System Inc., formerly 159569 Canada Ltd., (“System”), both corporations duly
incorporated under the Canada Business Corporations Act;

WITNESSETH:

WHEREAS, IPL, Lakehead Pipe Line Company, Inc., a Delaware corporation (the
“Company”), and Lakehead Pipe Line Partners, L.P., a Delaware limited
partnership (the “Partnership”), are parties to a Distribution Support
Agreement, dated as of December 27, 1991 (the “Support Agreement”), pursuant to
Section 2.6(a) of which IPL agreed to cause the Company to comply on a timely
basis with its obligations under Article II of the Support Agreement, including
the Company’s obligation to purchase APIs (as defined in the Amended and
Restated Agreement of Limited Partnership of the Partnership) if necessary; and

WHEREAS, in accordance with the Plan of Arrangement (the “Plan of Arrangement”)
made pursuant to Section 192 of the Canada Business Corporations Act involving
IPL, its shareholders and System, which Plan of Arrangement was approved by
IPL’s Board of Directors on March 11, 1992, IPL’s shareholders on May 6, 1992,
and the Court of Queen’s Bench of Alberta on December 9, 1992, whereby IPL
transferred ownership of all of its assets other than the Canadian Main Line
System and the outstanding capital stock of the Company to System; and

WHEREAS, System and IPL desire that System assume the obligations of IPL under
the Support Agreement;

NOW THEREFORE, in consideration of the premises the parties agree as follows:

 

1. With the consent of IPL, System hereby assumes all of the duties, obligations
and liabilities of IPL under Section 2.6(a) of the Support Agreement and agrees
to perform and discharge the same in accordance with all of the terms and
conditions of the Support Agreement.

 

2.

System hereby agrees to indemnify and hold harmless IPL from and against any
loss, claim, damage or liability, or any action in respect thereof, to which IPL
may become subject, insofar as such loss, claim, damage, liability or action
arises out of, or is based upon, the breach or nonperformance by System of any
of its duties, obligations or liabilities hereunder, and shall reimburse IPL
promptly upon demand for any legal or

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other expenses reasonably incurred by IPL in connection with investigating or
defending or preparing to defend against any such loss, claim, damage, liability
or action as such expenses are incurred.

IN WITNESS WHEREOF, the parties have executed this Assumption and Indemnity
Agreement as of the date first written above.

 

INTERPROVINCIAL PIPE LINE INC. By:   /s/ D. P. Truswell By:   /s/ D. B.
MacDermott   Donald B. MacDermott   [ILLEGIBLE] INTERPROVINCIAL PIPE LINE SYSTEM
INC. By:   /s/ D. B. MacDermott   President By:   /s/ B. G. Melnyk  

 

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