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Exhibit 10.19

FIRST AMENDING AGREEMENT

THIS AGREEMENT is made as of March 1, 2005

BETWEEN:

RANGELAND PIPELINE COMPANY, an unlimited liability company existing under the
laws of the Province of Nova Scotia (hereinafter referred to as the "Borrower"),

        OF THE FIRST PART,

—and—

ROYAL BANK OF CANADA, BANK OF AMERICA, N.A. CANADA BRANCH, BANK OF MONTREAL, THE
BANK OF NOVA SCOTIA, BNP PARIBAS (CANADA), CONGRESS FINANCIAL CORPORATION
(CANADA) and UNION BANK OF CALIFORNIA, N.A., CANADA BRANCH (hereinafter referred
to collectively as the "Lenders" and individually as a "Lender"),

        OF THE SECOND PART,

—and—

ROYAL BANK OF CANADA, a Canadian chartered bank, as agent of the Lenders
(hereinafter referred to as the "Agent"),

        OF THE THIRD PART.

        WHEREAS the parties hereto have agreed to amend and supplement certain
provisions of the Credit Agreement as hereinafter set forth;

        NOW THEREFORE THIS AGREEMENT WITNESSES that in consideration of the
covenants and agreements herein contained and other good and valuable
consideration, the receipt and sufficiency of which are hereby conclusively
acknowledged by each of the parties hereto, the parties hereto covenant and
agree as follows:

1.     Interpretation

        1.1.  In this Agreement and the recitals hereto, unless something in the
subject matter or context is inconsistent therewith:

        "Agreement" means this agreement, as amended, modified, supplemented or
restated from time to time.

        "Credit Agreement" means the credit agreement made as of May 11, 2004
between the Borrower (by its predecessor, RPC Acquisition Company), the Lenders
and the Agent.

        1.2.  Capitalized terms used herein without express definition shall
have the same meanings herein as are ascribed thereto in the Credit Agreement.

        1.3.  The division of this Agreement into Sections and the insertion of
headings are for convenience of reference only and shall not affect the
construction or interpretation of this Agreement. The terms "this Agreement",
"hereof", "hereunder" and similar expressions refer to this Agreement and not to
any particular Section or other portion hereof and include any agreements
supplemental hereto.

        1.4.  This Agreement shall be governed by and construed in accordance
with the laws of the Province of Alberta and the federal laws of Canada
applicable therein.

2.     Amendments and Supplements

        2.1.  Definition of "Change of Control". The existing definition of
"Change of Control" contained in Section 1.1(1) of the Credit Agreement is
hereby amended to delete the references to "The Anschutz Corporation" in the
third line of subparagraph (b) thereof, in the fourth and fifth lines of
subparagraph (c) thereof, in the fifth line of subparagraph (d) thereof and in
the fifth line of subparagraph (e) thereof and to substitute therefor, in all
cases, "LB Pacific, LP". The parties hereto hereby confirm and agree that all
references to the term "The Anschutz Corporation" in the definition of "Change
of Control" shall hereinafter be references to "LB Pacific, LP".

3.     Representations and Warranties

        The Borrower hereby represents and warrants as follows to each Lender
and the Agent and acknowledges and confirms that each Lender and the Agent is
relying upon such representations and warranties:

        (a)   Capacity, Power and Authority

(i)It is duly amalgamated and is validly subsisting under the laws of its
jurisdiction of amalgamation and has all the requisite corporate capacity, power
and authority to carry on its business as presently conducted and to own its
property; and

(ii)It has the requisite corporate capacity, power and authority to execute and
deliver this Agreement.

        (b)   Authorization; Enforceability

It has taken or caused to be taken all necessary action to authorize, and has
duly executed and delivered, this Agreement, and this Agreement is a legal,
valid and binding obligation of it enforceable against it in accordance with its
terms, subject to applicable bankruptcy, reorganization, winding up, insolvency,
moratorium or other laws of general application affecting the enforcement of
creditors' rights generally and to the equitable and statutory powers of the
courts having jurisdiction with respect thereto.

        (c)   Compliance with Other Instruments

None of the authorization, execution or delivery of this Agreement or
performance of any obligation pursuant hereto requires or will require, pursuant
to applicable law now in effect, any approval or consent of any Governmental
Authority having jurisdiction (except such as has already been obtained and are
in full force and effect) nor is in conflict with or contravention of:

(i)the Borrower's or any Subsidiary's articles, by laws or other constating
documents or any resolutions of directors or shareholders or the provisions of
its partnership agreement or declaration of trust or trust indenture (as
applicable); or

(ii)the provisions of any other indenture, instrument, undertaking or other
agreement to which the Borrower or any of its Subsidiaries is a party or by
which they or their properties or assets are bound, the contravention of which
would have or would reasonably be expected to have a Material Adverse Effect.

        (d)   No Default

No Default or Event of Default has occurred or is continuing.

        The representations and warranties set out in this Agreement shall
survive the execution and delivery of this Agreement and the making of each
Drawdown, notwithstanding any investigations or examinations which may be made
by or on behalf of the Agent, the Lenders or Lenders' Counsel. Such
representations and warranties shall survive until the Credit Agreement has been
terminated.

4.     Condition Precedent

        The amendments and supplements to the Credit Agreement contained herein
shall be effective upon each Guarantor executing and delivering to the Agent and
the Lenders a Confirmation of Guarantee in the form attached hereto.

5.     Confirmation of Credit Agreement and other Documents

        The Credit Agreement and the other Documents to which the Borrower is a
party and all covenants, terms and provisions thereof, except as expressly
amended and supplemented by this Agreement, shall be and continue to be in full
force and effect and the Credit Agreement as amended and supplemented by this
Agreement and each of the other Documents to which the Borrower is a party are
hereby ratified and confirmed and shall, from and after the date hereof,
continue in full force and effect as herein amended and supplemented, with such
amendments and supplements being effective from and as of the date hereof upon
satisfaction of the condition precedent set forth in Section 4 hereof.

6.     Further Assurances

        The parties hereto shall from time to time do all such further acts and
things and execute and deliver all such documents as are required in order to
effect the full intent of and fully perform and carry out the terms of this
Agreement.

7.     Enurement

        This Agreement shall enure to the benefit of and shall be binding upon
the parties hereto and their respective successors and permitted assigns in
accordance with the Credit Agreement.

8.     Counterparts

        This Agreement may be executed in any number of counterparts, each of
which shall be deemed to be an original and all of which taken together shall be
deemed to constitute one and the same instrument, and it shall not be necessary
in making proof of this Agreement to produce or account for more than one such
counterpart. Such executed counterparts may be delivered by facsimile
transmission and, when so delivered, shall constitute a binding agreement of the
parties hereto.

        IN WITNESS WHEREOF the parties hereto have executed this Agreement.

 
 
RANGELAND PIPELINE COMPANY
 
 
By:
 
/s/  GERALD A. TYWONIUK      

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Name: Gerald A. Tywoniuk
Title: Sr. Vice President, CFO and Treasurer
 
 
By:
 

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Name:
Title:

 
 
LENDERS:
 
 
ROYAL BANK OF CANADA
 
 
By:
 
/s/  CHRIS L. FONG      

--------------------------------------------------------------------------------

Name: Chris L. Fong
Title: Authorized Signatory
 
 
By:
 
/s/        

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Name:
Title:
 
 
BANK OF AMERICA, N.A., CANADA BRANCH
 
 
By:
 
/s/  MEDINA SALES DE ANDRADE      

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Name: Medina Sales de Andrade
Title: Assistant Vice President
 
 
By:
 
/s/        

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Name:
Title:
 
 
BANK OF MONTREAL
 
 
By:
 
/s/  R.P. HEINRICHS      

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Name: R.P. Heinrichs
Title: Vice President
 
 
By:
 
/s/        

--------------------------------------------------------------------------------

Name:
Title:
 
 
THE BANK OF NOVA SCOTIA
 
 
By:
 
/s/  MATTHEW VAN REMMEN      

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Name: Matthew van Remmen
Title: Associate Director
 
 
By:
 
/s/  DAN LINDQUIST      

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Name: Dan Lindquist
Title: Director

 
 
BNP PARIBAS (CANADA)
 
 
By:
 
/s/  MICHAEL GOSSELIN      

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Name: Michael Gosselin
Title: Managing Director
 
 
By:
 
/s/  EDWARD PAK      

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Name: Edward Pak
Title: Assistant Vice President
 
 
CONGRESS FINANCIAL CORPORATION (CANADA)
 
 
By:
 
/s/  NIALL H. HAMILTON      

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Name: Niall H. Hamilton
Title: Senior Vice President
 
 
By:
 
/s/        

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Name:
Title:
 
 
UNION BANK OF CALIFORNIA, N.A., CANADA BRANCH
 
 
By:
 
/s/  JAMES G. CHEPYHA      

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Name: James G. Chepyha
Title: Vice President
 
 
By:
 
/s/        

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Name:
Title:
 
 
AGENT:
 
 
ROYAL BANK OF CANADA, in its capacity as Agent
 
 
By:
 
/s/  GAIL WATKIN      

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Name: Gail Watkin
Title: Manager, Agency

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FIRST AMENDING AGREEMENT