EXHIBIT 3.11

CANADA BUSINESS
CORPORATIONS ACT

     Form 11

ARTICLES OF CONTINUANCE
(Section 181)

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1.   Name of Corporation.

     NORTH AMERICAN CONSTRUCTION LTD.

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2.   Place in Canada where the registered office is to be situated.

     Edmonton, Alberta

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3.   The classes and any maximum number of shares that the corporation is
     authorized to issue.

     See Schedule I attached hereto:

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4.   Restrictions if any on share transfers.
     No shares of the Corporation shall be transferred without the approval of
the directors of the Corporation either by a resolution passed at a Board of
directors meeting or by an instrument or instruments in writing signed by all
the directors.
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5.   Number (or minimum and maximum number) of directors.

Minimum number of directors one (1) maximum number of directors twenty (2

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6.   Restrictions if any on businesses the corporation may carry on.

     None

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7.   (1) If change of name effected     (2) Details of Incorporation
         previous name.
                                        Incorporated under The Companies
         n/a                            Act - March 13, 1969, Continued under
                                        The Business Corporations A (Alberta)
                                        October 31, 1983.

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8.   Other provisions if any.

     See Schedule II attached hereto:

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Date            Signature                        Description of Office


                /s/  [Illegible]
July 20, 1988       -------------------------    Director

                                                 /s/  [Illegible]
                                                     ---------------------------



SCHEDULE I  attached to the Articles of Continuance of
            NORTH AMERICAN CONSTRUCTION LTD.

     The classes and any maximum number of shares that the Corporation is
     authorized to issue.

     3.1  (a)  100 Class "A" Voting Non-Participating Common Shares;

          (b)  1,000 Class "B" Non-Voting Participating Common Shares;

          (c)  100,000 Class "C" Redeemable Preferred Shares;
          shares of any class may be issued in one or more series, and the
          directors shall have authority to determine the designation, rights,
          privileges, restrictions and conditions attaching to the shares of
          each series.

     3.2       The Class "A" and Class "B" Common and Class "C" Redeemable
     Preferred Shares shall have attached thereto the following special rights,
     privileges and restrictions:

          (a)  Dividends: The holders of the Class "C" Redeemable Preferred
               Shares shall only be entitled to a dividend in the event that the
               Directors so designate upon issuance of such shares and then at
               such rate, and having such preference or priority over dividends
               on the Class "B" Common Shares as the directors determine by
               resolution at the time of issuance of the preference shares.

                    The Class "A" Common Shares shall not be entitled to a
               dividend.

                    No dividends shall at any time be declared or paid on or set
               apart for the Class "B" Common Shares in circumstances which
               would result in an impairment of the ability of the Corporation
               to purchase or redeem all of the Class "C" Redeemable Preferred
               Shares.



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          (b)  Premium: Upon the issuance of any series of Class "C" Redeemable
               Preferred Shares, the directors may provide for the payment of a
               premium upon any purchase or redemption of shares of such series
               by the Corporation in excess of the price or consideration at or
               for which such shares have been issued and such additional
               amount, if any, required to be paid by the Corporation on such
               purchase or redemption of any such share is hereinafter referred
               to in these Articles of Continuance as the "Premium" on the
               shares of such series.

          (c)  Redemption of Class "C" Redeemable Preferred Shares: The
               Corporation may upon thirty (30) days notice in writing to any
               holder of Class "C" Redeemable Preferred Shares, redeem at any
               time or from time to time the whole or any part of the then
               outstanding Class "C" Redeemable Preferred Shares on payment for
               each share to be redeemed of the sum of: the issue price thereof,
               the amount of any dividend thereon declared and unpaid or
               accumulated, and the aggregate of the Premiums on the shares to
               be redeemed (the "Redemption Amount"). Where the directors
               determine to redeem less than all of the Class "C" Redeemable
               Preferred Shares outstanding at any time the shares to be
               redeemed at any particular time or from time to time shall be
               selected by lot, or otherwise, in such manner as the Board of
               Directors may determine from time to time.



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               Subject to the laws of Canada, a holder of Class "C" Redeemable
               Preferred Shares shall be entitled to require the Corporation to
               redeem at any time or times all or any of the Class "C"
               Redeemable Preferred Shares registered in the name of such holder
               on the books of the Corporation by tendering to the Corporation
               at its head office a share certificate representing the Class "C"
               Redeemable Preferred Shares which the registered holder desires
               to have the Corporation redeem together with a request in writing
               specifying:

               (i)  that the registered holder desires to have the Class "C"
                    Redeemable Preferred Shares represented by such certificate
                    redeemed by the Corporation and

               (ii) the business day (in this paragraph referred to as the
                    "Redemption Date") on which the holder desires to have the
                    Corporation redeem such Class "C" Redeemable Preferred
                    Shares.

               The requests in writing shall specify a Redemption Date which
               shall not be less than thirty (30) days after the day on which
               the request in writing is given to the Corporation. Upon receipt
               of a share certificate representing the Class "C" Redeemable
               Preferred Shares which the registered holder desires to have the
               Corporation redeem together with such request the Corporation
               shall, subject to its being able to do so under the laws of
               Canada, on the Redemption Date redeem such Class "C" Redeemable
               Preferred Shares by paying to such registered holder the
               Redemption Amount applicable to each of such shares.



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                    Class "C" Redeemable Preferred Shares tendered to the
               Corporation as aforesaid shall be redeemed on the Redemption Date
               and from and after the Redemption Date the holders thereof shall
               not be entitled to exercise any of the rights of holders of Class
               "C" Redeemable Preferred Shares in respect thereof unless payment
               of the full Redemption Amount applicable to each such share is
               not made on the Redemption Date, in which event the rights of the
               holders of shares so tendered in respect of which the full
               Redemption Amount applicable is not paid shall remain unaffected.
               Until the Corporation has redeemed the shares so tendered in
               full, the shareholder who tendered his shares for redemption
               shall retain the status of a claimant and shall be entitled to be
               paid and have all shares so tendered redeemed in full as soon as
               the Corporation is lawfully able to do so.

          (d)  Purchase of Class "C" Redeemable Preferred Shares: Any holder of
               Class "C" Redeemable Preferred Shares may tender all or any part
               of his shares for purchase by the Corporation at any time.
               Upon receipt of such tender and subject to the purchase being
               permitted by law the Corporation shall purchase the shares so
               tendered for a price equal to the Redemption Amount applicable to
               each such share, and the Corporation shall take such action as is
               required of it by law to effect such purchase.



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          (e)  Voting Rights and Restrictions: The holders of the Class A"
               Common Shares and unless otherwise determined by the Directors
               upon the issuance of the Class "C" Redeemable Preferred Shares,
               also the holders of the Class "C" Redeemable Preferred Shares
               shall be entitled to one vote for each such share held provided
               that any resolution which proposes to vary the rights attaching
               to any class of shares in the capital of the Corporation shall
               only be effective and valid where it is consented to or approved
               by the holders of two thirds of the shares of each class entitled
               to vote at such meeting. Subject always to the laws of Canada,
               holders of the Class "B" Common Shares shall have no voting
               privileges.

          (f)  Issuance of New Shares: The holders of the Class "C" Redeemable
               Preferred Shares shall not be entitled as of right to subscribe
               for or purchase or receive any part of any issue of shares or of
               bonds, debentures or other securities of the Corporation now or
               hereafter authorized.

          (g)  Liquidation, Dissolution, Winding-up: In the event of
               liquidation, dissolution or winding-up of the Corporation or any
               other distribution of assets among the shareholders for the
               purpose of winding up its affairs, the holders of the Class "C"
               Redeemable Preferred Shares shall be entitled to receive the



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               Redemption Amount applicable to each such share before any amount
               shall be paid or any property or assets of the Company
               distributed to the holders of any common shares. After payment to
               the holders of the Class "C" Redeemable Preferred Shares of the
               amounts so payable to them they shall not be entitled to share
               in any further distribution of the property or assets of the
               Corporation.

               The holders of the Class "A" Common Shares shall be entitled to
               receive an amount equal to the issue price of each such share and
               the holders of the Class "B" Common Shares shall be entitled to
               participate pari passu in the assets remaining after the payments
               provided for herein to holders of Class "C" Redeemable Preferred
               Shares and Class "A" Common Shares in the event of the
               liquidation, dissolution or winding-up of the Company or any
               other distribution of assets among shareholders for the purpose
               of winding-up its affairs, provided that any sum reserved for the
               payment of dividends for any class of shares in accordance with
               the provisions of paragraph 3.2(a) above shall be distributed to
               the holders of that class of shares before any distribution of
               assets to the holders of Class "A" and Class "B" Common Shares."



SCHEDULE II attached to the Articles of Continuance of:
            NORTH AMERICAN CONSTRUCTION LTD.

9.   Other provisions if any:

i.   The number of shareholders of the Corporation, exclusive of:

     (a)  persons who are in its employment or that of an affiliate, and

     (b)  persons, who having been formerly in its employment or that of an
          affiliate were, while in that employment, shareholders of the
          Corporation and have continued to be shareholders of that Corporation
          after termination of that employment.

     is limited to not more than fifty (50) persons, two or more persons who are
     joint registered owners of one or more shares being counted as one
     shareholder.

ii.  Any invitation to the public to subscribe for securities of the Corporation
     is prohibited.