**Exhibit 4.3**

Schedule D 

**PCL EMPLOYEES HOLDINGS LTD.**

**REGULAR EMPLOYEE STOCK PURCHASE PLAN**

**CLASS 2 SERIES ‘10 COMMON NON-VOTING SHARES**

1. Establishment ofPlan. PCL Employees Holdings Ltd. (the “Company”), proposes to sell shares of its Class 2 Series ‘10 Common Non-Voting Shares (the “Plan Shares”) to Eligible Employees (as defined below) pursuant to this Employee StockPurchase Plan (the “Plan”). 

2. Purpose; Nature of Plan. 

(a) The purpose of this Plan is to provide Eligible Employees with a means of acquiring an equity interest in the Company.Because the Company’s shares are not publicly traded and are generally nontransferable except to the Company, Eligible Employees do not have an opportunity to acquire an equity interest in the Company except by purchasing directly from theCompany. The Company, by means of the Plan, seeks to enhance the Eligible Employees’ sense of participation in the affairs of the Company and its subsidiaries, and to provide an incentive for such Eligible Employees to exert maximum efforts forthe success of the Company. 

(b) It is the Company’s practice to determine annually the number, if any,and type of equity interests to be offered to Salaried Employees (as defined below) in that year and to adopt one or more employee stock purchase plans pursuant to which such equity interests will be offered in that year. Those plans generally areof two types: (i) “Universal Plans” under which shares are offered to certain specified Salaried Employees, up to a specified aggregate maximum number of shares, and (ii) “Regular Plans” under which shares are offeredto certain Salaried Employees approved by the Chief Executive Officer of the Company (the “CEO”), the number and class of shares being offered to each such employee being determined by the CEO, based on criteria determined by the board ofdirectors of the Company (the “Board”), including position, performance and existing share ownership. This Plan is a Regular Plan. References in this Plan to “Universal Plans” mean all Universal Plans heretofore or hereafteradopted by the Company and references to “Regular Plans” mean this Plan and all other Regular Plans heretofore or hereafter adopted by the Company. The shares of stock offered each year are identified by a Series designation that indicatesthe year of issuance and a Class designation that indicates whether such shares are voting or nonvoting and whether such shares were offered in Canada or the United States. The Class designations are as follows: 

 

References in this Plan to “CommonShares” includes all of the Company’s common shares of all Series and Classes heretofore or hereafter authorized or issued. 

3. Shares Available for Issuance. A total of 3,300,000 Plan Shares are available forissuance under this Plan. Such number shall be subject to adjustment upon the occurrence of certain events described in Section 10 of this Plan. 

4. Administration. This Plan shall be administered as directed by the Board, unless and until the Board delegates administration of the Plan to a committee appointed by the Board. As used in thisPlan, references to the “Board” shall include any such committee, if such a committee has been established. Subject to the provisions of this Plan, all questions of interpretation or application of this Plan shall be determined by theBoard and its decisions shall be final and binding upon all participants. All expenses incurred in connection with the administration of the Plan shall be paid by the Company. 

5. Eligibility; Participation in the Plan. 

(a) Definitions

i. “Eligible Employee” means a Salaried Employee who has been designated by the CEO, in theCEO’s discretion, as eligible to participate in the Plan. 

ii. “Salaried Employee” means anemployee of the Company or any of its subsidiaries, other than a student, who is paid a salary and not a wage based on an hourly or other periodic basis. 

(b) The Company shall offer Eligible Employees the opportunity to purchase Plan Shares under this Plan on one occasion or more during 2010. The number and class of shares to be offered to each EligibleEmployee shall be approved by the CEO, in the CEO’s discretion, having regard to criteria determined by the Board from time to time, including position, performance and existing share ownership. The Company shall establish such forms andprocedures as it deems appropriate for making that offer and for the acceptance of that offer by Eligible Employees who elect to purchase. The CEO shall have the authority, in his sole discretion, to modify or waive compliance by any EligibleEmployee with any such procedures. 

6. Purchase Price. The purchase price per share at which shares of Common Stockwill be sold pursuant to this Plan shall be determined by the Board in accordance with Section XI of the PCL Employees Holdings Ltd. Unanimous Shareholder Agreement, as amended from time to time (the “Shareholder Agreement”). 

7. Payment of Purchase Price; Issuance of Shares. 

(a) The purchase price for shares purchased under the Plan shall be paid on the purchase date by check drawn on a Canadianfinancial institution or by bank draft, in each case, payable to the Company in Canadian funds. The CEO shall have the authority, in his sole discretion, to modify the means of payment of the purchase price (but not the amount of the purchase priceor the timing of its payment) by any Eligible Employee. 

(b) As promptly as practicable after the purchasedate, the Company shall issue Plan Shares for the participant’s benefit representing the shares purchased. 

 
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8. Use of Proceeds. Proceeds from the sale of shares of Common Stock pursuant to thisPlan shall constitute general funds of the Company. 

9. Termination of Employment. If a participant’s employmentby the Company or any of its subsidiaries is terminated for any reason, including disability or death, prior to the actual issuance of a certificate for any shares, such participant’s rights to purchase Plan Shares shall immediately terminateand any funds received by the Company for the purchase of the shares shall promptly be returned to the participant (or to his or her estate). For purposes of this Section 9, employment of a participant by the Company or any of its subsidiarieswill not be deemed to have terminated in the event of (a) a transfer from the Company to any subsidiary of the Company or from any subsidiary of the Company to the Company or any other subsidiary, or (b) sick leave, military leave, or anyother leave of absence approved by the Board. 

10. Capital Changes. The number of Plan Shares which have beenauthorized for issuance under this Plan but have not yet been issued and the purchase price per share shall be proportionately adjusted for any stock split, stock dividend (but only in the form of Common Shares), recapitalization, combination or anyother increase or decrease in the number of issued and outstanding Common Shares affected without receipt of any consideration by the Company. Such adjustment shall be made by the Board, whose determination shall be final, binding and conclusive.

11. Nonassignability. No rights to purchase or receive Common Shares under this Plan may be assigned, transferred,pledged or otherwise disposed of in any way by the participant. Any attempt to assign, transfer, pledge or otherwise dispose of such rights shall be void and without effect. 

12. Shareholder Agreement; Restriction on Transfer. No participant may purchase shares under this Plan unless and until such participant has signed the Shareholder Agreement and agreed to be boundby the terms and conditions thereof. The shares purchased pursuant to this Plan are subject to the restrictions on transfer and ownership and the repurchase rights of the Company set forth in the Shareholder Agreement. Shares may not be transferredexcept in compliance with all applicable laws, including, without limitation, Canadian and United States securities laws. In addition to any legend required by the Shareholder Agreement, all certificates evidencing shares issued to employees shallbear any legends which, in the Board’s judgment, are necessary to comply with applicable securities laws. 

13.Reports. Within a reasonable time after the end of each fiscal year, the Company shall prepare and distribute a year-end report to its shareholders, which report shall include consolidated financial statements of the Company and itssubsidiaries for the fiscal year. 

14. Limitation of Rights. Neither this Plan nor the grant of the right to purchaseshares hereunder shall confer any right on any employee to remain in the employ of the Company or any subsidiary of the Company, or restrict the right of the Company or any of its subsidiaries to terminate such employee’s employment. Inaddition, no participant shall have any rights as a shareholder of the Company with respect to any Plan Shares awarded to the participant under this Plan until the date shares have been issued to the participant. 

 
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15. Notices. All notices or other communications by a participant under or inconnection with the Plan shall be given as provided in the Shareholder Agreement. 

16. Term; Shareholder Approval. ThisPlan shall become effective on the date on which it is adopted by the Board. This Plan shall be approved by the shareholders of the Company, in any manner permitted by applicable corporate law, within 12 months after the date this Plan is adopted bythe Board. This Plan shall continue until the first to occur of (a) termination of this Plan by the Board (which termination may be effected by the Board at any time) or (b) the end of the Company’s 2010 fiscal year. 

17. Applicable Law. The Plan shall be governed by the substantive laws (excluding the conflict of laws rules) of the Province ofAlberta, Canada. 

18. Amendments or Termination of this Plan. The Board may, at any time, amend, terminate or extendthe term of this Plan, except no amendment may be made without approval of the shareholders of the Company before or within 12 months after the adoption of such amendment if such amendment would: (a) increase the number of shares that may beissued under this Plan, or (b) extend the term of this Plan. 

 
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