Document:

exv10w1

 

EXHIBIT 10.1

ENDEAVOUR INTERNATIONAL CORPORATION

2007 INCENTIVE PLAN

INCENTIVE AWARD AGREEMENT

     THIS INCENTIVE AWARD AGREEMENT (this “Agreement”) is made and entered into by and between
Endeavour International Corporation, a Nevada corporation (the “Company”) and ___, an
individual (“Grantee”) as of the ___day of ___, 200___(the “Grant Date”), pursuant to the
Company’s 2007 Incentive Plan (the “Plan”). The Plan is incorporated by reference herein in its
entirety. Capitalized terms not otherwise defined in this Agreement shall have the meaning given
to such terms in the Plan.

     WHEREAS, Grantee is an employee of the Company, and in connection therewith, the Company
desires to grant to Grantee an Incentive Award, subject to the terms and conditions of this
Agreement, with a view to increasing Grantee’s interest in the Company’s welfare and growth; and

     WHEREAS, Grantee desires to have the opportunity to be a holder of shares of the Company’s
Common Stock subject to the terms and conditions of this Agreement.

     NOW, THEREFORE, in consideration of the premises, mutual covenants and agreements contained
herein, and other good and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows:

     1. Grant of Incentive Award. Subject to the restrictions, forfeiture provisions and
other terms and conditions set forth herein, the Company grants to Grantee an incentive
award equivalent to the value of                      shares of Common Stock (“Incentive Award”). At
the time of vesting of a portion of the Incentive Award as provided herein, such portion of
the Incentive Award shall be paid in shares of Common Stock or cash or a combination
thereof, as determined by the Committee at its sole discretion, to or on behalf of Grantee.
For purposes of cash payment, each share shall have a value equal to the Fair Market Value
on the date of vesting.

     2. Transfer Restrictions.

          (a) Generally. Grantee shall not sell, assign, transfer, exchange, pledge, encumber,
gift, devise, hypothecate or otherwise dispose of (collectively, “Transfer”) the Incentive
Award before vesting. The Incentive Award shall vest as to                     % percent of the Incentive
Award on each anniversary of and beginning on                     , 200___until the Incentive Award
is 100% vested on                     , 200___; provided, however, that, subject to Section 3,
Grantee then is, and continuously since the Grant Date has been, an employee of the Company.

 

 

          (b) Extraordinary Transactions. If there is a Change in Control of the Company (as
defined in the Plan), the transfer restrictions of this Section 2 shall
automatically cease as of the effective date of such Change in Control, and all the
Incentive Award shall thereafter be 100% vested.

     3. Forfeiture.

     Termination of Employment. If Grantee’s employment with the Company is terminated by
the Company or Grantee for any reason, then Grantee shall immediately forfeit all of the
Incentive Award which has not vested and been paid to the Grantee unless the Committee, in
its discretion, determines that any or all of such Incentive Award shall not be so
forfeited.

     4. Tax Requirements.

     Tax Withholding. The Company shall have the power and the right to deduct or withhold,
or require the Grantee to remit to the Company, an amount sufficient to satisfy federal,
state, and local taxes, domestic or foreign, required by law or regulation to be withheld
with respect to any taxable event arising as a result of the Plan and this Agreement.

     5. Miscellaneous.

          (a) Certain Transfers Void. Any purported Transfer of an Incentive Award in breach of
any provision of this Agreement shall be void and ineffectual, and shall not operate to
Transfer any interest or title in the purported transferee.

          (b) No Fractional Shares. All provisions of this Agreement concern whole shares of
Common Stock. If the application of any provision hereunder would yield a fractional share,
such fractional share shall be rounded down to the next whole share if it is less than 0.5
and rounded up to the next whole share if it is 0.5 or more.

          (c) Not an Employment or Service Agreement. This Agreement is not an employment
agreement, and this Agreement shall not be, and no provision of this Agreement shall be
construed or interpreted to create any employment relationship between Grantee and the
Company, its affiliates, its parent, subsidiaries or any of their affiliates.

          (d) Dispute Resolution.

     (i) Arbitration. All disputes and controversies of every kind and nature between any parties
hereto arising out of or in connection with this Agreement or the transactions described herein as
to the construction, validity, interpretation or meaning, performance, non-performance,
enforcement, operation or breach, shall be submitted to arbitration pursuant to the following
procedures:

 

 

          (1) After a dispute or controversy arises, any party may, in a written notice delivered to the
other parties to the dispute, demand such arbitration. Such notice shall designate the name of the
arbitrator (who shall be an impartial person) appointed by such party demanding arbitration,
together with a statement of the matter in controversy.

          (2) Within 30 days after receipt of such demand, the other parties shall, in a written notice
delivered to the first party, name such parties’ arbitrator (who shall be an impartial person). If
such parties fail to name an arbitrator, then the second arbitrator shall be named by the American
Arbitration Association (the “AAA”). The two arbitrators so selected shall name a third arbitrator
(who shall be an impartial person) within 30 days, or in lieu of such agreement on a third
arbitrator by the two arbitrators so appointed, the third arbitrator shall be appointed by the AAA.
If any arbitrator appointed hereunder shall die, resign, refuse or become unable to act before an
arbitration decision is rendered, then the vacancy shall be filled by the method set forth in this
Section for the original appointment of such arbitrator.

          (3) Each party shall bear its own arbitration costs and expenses. The arbitration hearing
shall be held in Houston, Texas at a location designated by a majority of the arbitrators. The
Commercial Arbitration Rules of the American Arbitration Association shall be incorporated by
reference at such hearing and the substantive laws of the State of Texas (excluding conflict of
laws provisions) shall apply.

          (4) The arbitration hearing shall be concluded within ten (10) days unless otherwise ordered
by the arbitrators and the written award thereon shall be made within fifteen (15) days after the
close of submission of evidence. An award rendered by a majority of the arbitrators appointed
pursuant to this Agreement shall be final and binding on all parties to the proceeding, shall
resolve the question of costs of the arbitrators and all related matters, and judgment on such
award may be entered and enforced by either party in any court of competent jurisdiction.

          (5) Except as set forth in Section 5(d)(ii), the parties stipulate that the provisions of this
Section shall be a complete defense to any suit, action or proceeding instituted in any federal,
state or local court or before any administrative tribunal with respect to any controversy or
dispute arising out of this Agreement or the transactions described herein. The arbitration
provisions hereof shall, with respect to such controversy or dispute, survive the termination or
expiration of this Agreement.

No party to an arbitration may disclose the existence or results of any arbitration
hereunder without the prior written consent of the other parties; nor will any party
to an arbitration disclose to any third party any confidential information disclosed
by any other party to an arbitration in the course of an arbitration hereunder
without the prior written consent of such other party.

     (ii) Emergency Relief. Notwithstanding anything in this Section 5(d) to the contrary, any
party may seek from a court any provisional remedy that may be necessary to protect any rights or
property of such party pending the establishment of the arbitral tribunal or its determination of
the merits of the controversy or to enforce a party’s rights under Section 5(d).

 

 

          (e) Notices. Any notice, instruction, authorization, request or demand required
hereunder shall be in writing, and shall be delivered either by personal delivery, by
telegram, telex, telecopy or similar facsimile means, by certified or registered mail,
return receipt requested, or by courier or delivery service, addressed to the Company at the
address indicated beneath its signature on the execution page of this Agreement, and to
Grantee at his address indicated on the Company’s stock records, or at such other address
and number as a party shall have previously designated by written notice given to the other
party in the manner hereinabove set forth. Notices shall be deemed given when received, if
sent by facsimile means (confirmation of such receipt by confirmed facsimile transmission
being deemed receipt of communications sent by facsimile means); and when delivered and
receipted for (or upon the date of attempted delivery where delivery is refused), if
hand-delivered, sent by express courier or delivery service, or sent by certified or
registered mail, return receipt requested.

          (f) Amendment and Waiver. This Agreement may be amended, modified or superseded only
by written instrument executed by the Company and Grantee. Any waiver of the terms or
conditions hereof shall be made only by a written instrument executed and delivered by the
party waiving compliance. Any waiver granted by the Company shall be effective only if
executed and delivered by a duly authorized executive officer of the Company other than
Grantee. The failure of any party at any time or times to require performance of any
provisions hereof, shall in no manner effect the right to enforce the same. No waiver by
any party of any term or condition, or the breach of any term or condition contained in this
Agreement in one or more instances shall be deemed to be, or construed as, a further or
continuing waiver of any such condition or breach or a waiver of any other condition or the
breach of any other term or condition.

          (g) Governing Law and Severability. This Agreement shall be governed by the internal
laws, and not the laws of conflict, of the State of Texas. The invalidity of any provision
of this Agreement shall not affect any other provision of this Agreement, which shall remain
in full force and effect.

          (h) Successors and Assigns. Subject to the limitations which this Agreement imposes
upon transferability of shares of Common Stock, this Agreement shall bind, be enforceable by
and inure to the benefit of the Company and its successors and assigns, and Grantee, and
Grantee’s permitted assigns and upon death, estate and beneficiaries thereof (whether by
will or the laws of descent and distribution), executors, administrators, agents, legal and
personal representatives.

          (i) Community Property. Each spouse individually is bound by, and such spouse’s
interest, if any, in any Shares is subject to, the terms of this Agreement. Nothing in this
Agreement shall create a community property interest where none otherwise exists.

          (j) Entire Agreement. This Agreement together with the Plan supersede any and all
other prior understandings and agreements, either oral or in writing, between the parties
with respect to the subject matter hereof and constitute the sole and only agreements
between the parties with respect to the said subject matter. All prior

 

 

negotiations and agreements between the parties with respect to the subject matter
hereof are merged into this Agreement. Each party to this Agreement acknowledges that no
representations, inducements, promises, or agreements, orally or otherwise, have been made
by any party or by anyone acting on behalf of any party, which are not embodied in this
Agreement or the Plan and that any agreement, statement or promise that is not contained in
this Agreement or the Plan shall not be valid or binding or of any force or effect.

[SIGNATURE PAGE FOLLOWS]

 

 

     IN WITNESS WHEREOF, the parties have caused this Agreement to be executed on the date first
above written.

	 	 	 	 	 
	 	COMPANY:

ENDEAVOUR INTERNATIONAL CORPORATION

 	 
	 	By:  	 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 
	 
	 	Address: 1000 Main Street, Suite 3300

                Houston, Texas 77002

Telecopy No.: (713) 307-8794

Attention: Secretary

 	 
	 	GRANTEE:exv10w4

 

Exhibit 10.4

SHARE PURCHASE AGREEMENT

     This Share Purchase Agreement (this “Agreement”) is made and entered into as of the
5th day of June, 2007 (the “Effective Date”), by and among Willbros Acquisition Canada
Limited, a company incorporated under the laws of British Columbia, Canada (“Purchaser”); AMEC
Inc., a company incorporated under the laws of Canada (“AMEC”); and AMEC Americas Limited, a
company incorporated under the laws of Canada (“AMEC Americas” and, collectively with AMEC,
“Sellers” or, individually, each a “Seller”).

RECITALS

     A. Sellers own all of the issued and outstanding share capital of Midwest Management (1987)
Limited, a company organized under the laws of Saskatchewan, Canada (“Midwest”), which is engaged
in the business of pipeline construction contracting for the oil and gas industry (the “Business”).

     B. Purchaser desires to acquire, and Sellers desire to sell, said share capital of Midwest.

     C. Purchaser and Sellers (the “Parties”) desire to evidence their agreement to the terms and
conditions of the purchase and sale of said share capital of Midwest as set forth in this
Agreement.

     In consideration of the recitals and the representations, warranties and covenants set forth
in this Agreement, the Parties hereby agree as follows:

ARTICLE I

DEFINITIONS

     1.1 Defined Terms. As used in this Agreement, each of the following terms has the meaning
specified below:

     “Accounts Payable” means any and all trade accounts payable of the Midwest Group.

     “Adjustment Statement” means a statement showing Current Assets, Current Liabilities, Working
Capital, Debt Load Adjustment and Other Liabilities Adjustment as of the Closing Date.

     “Affiliate” means, with respect to any Person, each other Person that, directly or indirectly
(through one or more intermediaries or otherwise), controls, is controlled by, or is under common
control with such Person. The term “control” (including the terms “controlled by” and “under
common control with”) means the possession, directly or indirectly, of the actual power to direct
or cause the direction of the management policies of a Person, whether through the ownership of
stock or share capital, by contract, credit arrangement or otherwise.

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     “Agreement” means this Share Purchase Agreement, as amended, supplemented or modified from
time to time.

     “AMEC” has the meaning specified in the introductory paragraph of this Agreement.

     “AMEC Americas” has the meaning specified in the introductory paragraph of this Agreement.

     “Applicable Privacy Laws” means any and all applicable laws relating to privacy and the
collection, use and disclosure of personal information in all applicable jurisdictions, including
the Personal Information Protection and Electronic Documents Act (Canada) and/or any comparable
provincial law including the Personal Information Protection Act (Alberta).

     “Bureau” has the meaning specified in Section 7.1(b).

     “Business” has the meaning specified in the Recitals to this Agreement.

     “Centra Gas Project” means the project involving the construction of approximately 227
kilometers of pipeline for Centra Gas Manitoba Inc.’s Rural Expansion Project and the litigation
arising therefrom, including the litigation in the Manitoba’s Queen’s Bench (Cause Number
C101-01-15699 and C104-02-01236).

     “Claim” has the meaning specified in Section 8.1.

     “Closing” means the consummation of the purchase and sale of the Shares hereunder.

     “Closing Balance Sheet” has the meaning specified in Section 2.3(b)(ii).

     “Closing Date” has the meaning specified in Section 3.1.

     “Closing Date Adjusting Payments” has the meaning specified in Section 2.3(b).

     “Closing Purchase Price” has the meaning specified in Section 2.3(a).

     “Company Contracts” means all written agreements, contracts and commitments (other than
leases) to which Midwest or any of the Subsidiaries is a party, by which Midwest or any of the
Subsidiaries is directly or indirectly bound, or to which any asset of Midwest or any of the
Subsidiaries may be subject, including:

     (a) loan agreements, indentures, letters of credit, mortgages, security agreements,
pledge agreements, deeds of trust, bonds, notes, guarantees, and other agreements and
instruments relating to the borrowing of money or obtaining of or extension of credit;

     (b) licenses, licensing arrangements and other contracts providing in whole or in part
for the use of, or limiting the use of, any Intellectual Property Rights;

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     (c) joint venture, partnership and similar contracts involving a sharing of profits or
expenses (including joint research and development and joint marketing contracts);

     (d) asset and share purchase agreements and other acquisition or divestiture
agreements, including any agreements relating to the sale, lease or disposal of any shares
or assets (other than sales of inventory in the ordinary course of business) or involving
continuing indemnity or other obligations;

     (e) unfulfilled or pending orders and other contracts for the purchase or sale of
materials, supplies, products or services, each of which involves aggregate payments in
excess of $25,000;

     (f) contracts with respect to which the aggregate amount that could reasonably be
expected to be paid or received thereunder in the future exceeds $15,000 per annum or
$25,000 in the aggregate;

     (g) sales agency, manufacturer’s representative, marketing and distributorship
agreements;

     (h) contracts, agreements and arrangements with respect to the representation of
Midwest or any of the Subsidiaries in foreign countries;

     (i) contracts, agreements and commitments with AMEC or AMEC Americas or any of their
employees or Affiliates; and

     (j) any other written contracts, agreements and commitments that are (i) material to
the business or financial condition of the Midwest Group, taken as a whole, and (ii) not
otherwise captured by a defined term used elsewhere herein.

     “Company Employee Benefit Plans” means “employee benefit plans,” including severance pay, sick
leave, vacation pay, salary continuation for disability, retirement, deferred compensation, bonus,
long-term incentive, profit sharing, pension, hospitalization, medical insurance, life insurance
and scholarship programs: (a) maintained by AMEC or AMEC Americas or any of their Affiliates for
the benefit of Midwest or any of the Subsidiaries, (b) maintained by Midwest or any of the
Subsidiaries, or (c) to which Midwest or any of the Subsidiaries has contributed or is obligated to
contribute.

     “Company Permits” means any and all permits, licenses, variances, exemptions, orders,
franchises, approvals, consents, registrations and authorizations of all Governmental Authorities
held by Midwest or any of the Subsidiaries relating to the ownership, use or operation of their
businesses or assets.

     “Competition Act Approval” means either (i) the applicable waiting period under section 123 of
the Competition Act (Canada) shall have expired and the Commissioner of Competition

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(“Commissioner”) shall have issued a no-action letter whether pursuant to section 123(1) of the
Competition Act (Canada) or otherwise, to the effect that the Commissioner does not intend to make
an application under section 92 of the Competition Act (Canada) in respect of the transactions
contemplated this Agreement; or (ii) the Commissioner shall have issued an advance ruling
certificate under section 102(1) of the Competition Act (Canada) to the effect that the
Commissioner is satisfied that the Commissioner would not have sufficient grounds upon which to
apply to the Competition Tribunal for an order under section 92 of the Competition Act (Canada) in
respect of the transactions contemplated by this Agreement.

     “Current Assets” means the current assets reflected on the consolidated balance sheet of the
Midwest Group at any date, determined in accordance with GAAP, except for inter-company assets.

     “Current Liabilities” means the current liabilities reflected on the consolidated balance
sheet of the Midwest Group at any given date, determined in accordance with GAAP, except for
inter-company liabilities.

     “Debt Load Adjustment” has the meaning specified in Section 2.3(b)(i)(A).

     “Deposit” has the meaning specified in Section 2.2(a).

     “Disclosed Personal Information” has the meaning specified in Section 5.18.

     “Disclosure Schedule” means the Disclosure Schedule attached hereto and any documents listed
on such Disclosure Schedule and expressly incorporated therein by reference.

     “Dollars” or “$” means Canadian dollars.

     “Effective Date” has the meaning specified in the introductory paragraph of this Agreement.

     “Ellis Drive Property” means the real property located at 510 Ellis Drive, Acheson Industrial
Park, Parkland County, Alberta Plan 7720277, Block 1 Lots 9 and 10.

     “Environmental Law” means any applicable federal, provincial, state, local or foreign statute,
code, ordinance, rule, regulation, policy, guideline, permit, consent, approval, license, judgment,
order, writ, decree, common law, injunction, codes of practice (regardless of whether such
guidelines, standards and codes of practice have been promulgated by statute or regulation) or
other authorization in effect on the date hereof or at a previous time, relating to (a) emissions,
discharges, releases or threatened releases of Hazardous Materials into the natural environment,
including into ambient air, soil, sediments, land surface or subsurface, buildings or facilities,
surface water, groundwater, publicly-owned treatment works, septic systems or land; (b) the
generation, treatment, storage, disposal, use, handling, manufacturing, transportation or shipment
of Hazardous Materials;
(c) occupational health and safety; or (d) otherwise relating to the pollution of the
environment, solid waste handling treatment or disposal, operation or reclamation of oil and gas
operations or mines, or protection of environmentally sensitive areas.

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     “Environmental Reports” means the AMEC Phase I and Phase II reports dated February 2006,
Ecomark Phase I report dated May 23, 2006, Ecomark Phase II report dated April 18, 2007, and
Ecomark Phase III report dated July 7, 2006.

     “Estimated Closing Balance Sheet” has the meaning specified in Section 2.3(b)(i).

     “FCPA” has the meaning specified in Section 5.17.

     “GAAP” means the generally accepted accounting principles and interpretations from time to
time approved by the Canadian Institute of Chartered Accountants, or any successor institute,
applicable as at the date on which date such calculation is made or required to be made in
accordance with generally accepted accounting principles applied on a basis consistent with
preceding years.

     “Golder Associates Work Plan” means the Golder Associates Work Plan and Cost Estimate for a
Phase II Environmental Site Assessment at 510 Ellis Drive, Acheson Industrial Park, Parkland
County, Alberta dated April 25, 2007.

     “Golder Phase I” has the meaning specified in Section 5.19.

     “Golder Phase II” has the meaning specified in Section 5.19.

     “Governmental Authority” means any national, provincial, state, county or municipal
government, domestic or foreign, any agency, board, bureau, commission, court, department or other
instrumentality of any such government, or any arbitrator in any case that has jurisdiction over
Purchaser, either Seller, Midwest or any of the Subsidiaries, as the case may be, or any of their
properties or assets.

     “Hazardous Material” means (a) any hazardous substance, hazardous waste or solid waste, in
each case as defined by applicable Environmental Law; or (b) any solid, hazardous, dangerous or
toxic chemical, material, waste or substance, within the meaning of and regulated by any applicable
Environmental Law; (c) any radioactive material, including any naturally occurring radioactive
material, and any source, special or byproduct material as defined by applicable Environmental Law;
(d) any asbestos-containing materials in any form or condition; (e) any polychlorinated biphenyls
in any form or condition; or (f) petroleum, petroleum hydrocarbons, or any fraction or byproducts
thereof.

     “Indemnified Person” has the meaning specified in Section 8.1.

     “Indemnifying Party” has the meaning specified in Section 8.1.

     “Independent Accounting Firm” has the meaning specified in Section 2.3(c).

     “Intellectual Property Rights” means any and all proprietary and technical information, trade
names (registered and unregistered), trade secrets, patents and patent rights, patent

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applications,
patents pending, service marks (registered and unregistered), trademarks (registered and
unregistered), trademark and service mark registrations and applications, customer and supplier
lists and other information, price lists, advertising and promotional materials, field performance
data, research materials, royalty rights, copyrights, other proprietary intangibles, computer
programs and software, databases, processes, technical know-how, business and product know-how,
engineering and other drawings, plats, surveys, designs, plans, methods, engineering and
manufacturing specifications, technology, inventions, processes, methods, formulas, procedures,
literature and phone numbers, and operating and quality control manuals and data relating to the
Business, including the name and style of “Midwest” and “Midwest Pipelines” and derivations
thereof.

     “Inventory” means any and all inventories of raw materials, supplies, work in process and
finished goods, whether on hand or on order, including all raw materials and other materials used
or consumed in the course of the Business, labeling and packaging, products or goods ordered or
held for shipment or in transit and other finished products and goods.

     “Knowledge” (whether or not capitalized) means with respect to a Person which is a business
entity, the actual knowledge of each of the officers, directors, managers, members and partners of
such entity, after due investigation.

     “Lien” means any lien, mortgage, charge, hypothec, prior assignment, option, warrant, right to
possession claim, security interest, pledge, charge, production payment, restriction, burden on
title, encumbrance, rights of a vendor under any title retention or conditional sale agreement, or
other arrangement substantially equivalent thereto, other than a lease arrangement.

     “Material Adverse Effect” means (a) when used with respect to Sellers or the Midwest Group, a
result or consequence that would materially adversely affect the condition (financial or
otherwise), results of operations, business or prospects of the Midwest Group (taken as a whole) or
the aggregate value of their assets, or would materially impair the ability of the Midwest Group
(taken as a whole) to own, hold, develop and operate their assets or would impair Sellers’ ability
to perform their obligations hereunder or consummate the transactions contemplated hereby; and (b)
when used with respect to Purchaser, a result or consequence that would materially adversely affect
the condition (financial or otherwise), results of operations, business or prospects of Purchaser,
would materially impair the ability of Purchaser to own, hold, develop and operate its assets, or
would impair Purchaser’s ability to perform its obligations hereunder or consummate the
transactions contemplated hereby.

     “Material Claims” means Claims indemnified against under Article 8 or payment obligations
arising under Article 8 that individually exceed ten thousand dollars ($10,000).

     “MGCL Shares” has the meaning specified in Section 4.1(k)(ii).

     “Midwest” has the meaning specified in the Recitals to this Agreement.

     “Midwest Group” means, collectively, Midwest and the Subsidiaries.

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     “Midwest Group Financial Statements” has the meaning specified in Section 4.1(j).

     “MPRI Shares” has the meaning specified in Section 4.1(k)(iii).

     “Northern Territories” means the three territories of Canada, Northwest Territories, Nunavut
and Yukon.

     “Organizational Documents” means, as applicable, the certificate or articles of incorporation,
by-laws, constating documents and similar documents that govern the organization of any entity.

     “Other Liabilities Adjustment” has the meaning specified in Section 2.3(b).

     “Parties” has the meaning specified in the Recitals to this Agreement.

     “Person” (whether or not capitalized) means any natural person, individual, corporation,
company, limited or general partnership, joint stock company, joint venture, association, limited
liability company, trust, bank, trust company, business trust, union or other entity or
organization, whether or not a Governmental Authority, and the heirs, executors, administrators or
other legal representatives of an individual.

     “Personal Information” means information about an individual transferred to one party by
another in accordance with this Agreement and/or as a condition of the transaction contemplated
hereby.

     “Post Closing Date Adjusting Payments” has the meaning specified in Section 2.3(d).

     “Prohibited Property” means any property the fair market value of which is wholly or partly
attributable to, or the fair market value of which is determined primarily by reference to, the
fair market value of any of the property owned by the Midwest Group on the Closing Date, or the
proceeds of disposition therefrom, but does not include money.

     “Purchase Price” means the Closing Purchase Price as adjusted pursuant to Section 2.3

     “Purchaser” has the meaning specified in the introductory paragraph of this Agreement.

     “Purchaser Representative” means any employee, agent, advisor (including legal, accounting and
financial advisors), Affiliate or other representative of Purchaser.

     “Related persons” (whether or not capitalized) has the meaning specified in Section 8.1.

     “Resolution Period” has the meaning specified in Section 2.3(c).

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     “Responsible Officer” means, with respect to any corporation or other entity having officers,
the Chief Executive Officer, President, Chief Operating Officer, Chief Financial Officer or any
Vice President of such corporation or entity.

     “Sellers” and “Seller” have the meanings specified in the introductory paragraph of this
Agreement.

     “Seller Representative” means any employee, agent, advisor (including legal, accounting and
financial advisors), Affiliate or other representative of either Seller.

     “Shares” means 21 shares of the common share capital and 1,820,889 Class B shares of Midwest.

     “Subsidiaries” means the subsidiaries of Midwest: Midwest General Contractors Ltd., a company
organized as a federal corporation under the laws of Canada (“MGCL”), and Midwest Pipelines Rental
Inc., a company organized as a federal corporation under the laws of Canada (“MPRI”).

     “Tangible Personal Property” means all plant, equipment (including construction, shop and
office equipment), vehicles, machinery, manufacturing and laboratory equipment, testing equipment,
gauges, valves, compressors, tanks, motors, parts, tools, tooling, pumps, controls, materials and
supplies, computers, communications equipment, furnishings, furniture and other tangible property
owned, leased or used by the Midwest Group.

     “Target Working Capital” means $3,500,000.

     “Target Working Capital Adjustment” has the meaning specified in Section 2.3(b)(i)(B).

     “Tax Act” means the Income Tax Act (Canada), R.S.C. 1985 c.1 (5th
Supplement) and
the regulations thereto, all as amended from time to time.

     “Tax Returns” has the meaning specified in Section 4.1(ee).

     “Taxes” means all taxes, charges, fees, levies, imposts and other assessments, including all
income, sales, use, goods and services, value added, capital, capital gains, alternative, net
worth, transfer, profits, withholding, payroll, employer health, excise, franchise, real property
and personal property taxes, and any other taxes, customs duties, fees, assessments or similar
charges in the nature of a tax including Canada Pension Plan and provincial pension plan
contributions, unemployment insurance payments and worker’s compensation premiums, together with
any installments with respect
thereto, and any interest, fines and penalties imposed by any Governmental Authority, whether
disputed or not.

     “Third-Party Consent” means the consent or approval of any Person other than any of Sellers,
Purchaser, the Midwest Group or any Governmental Authority.

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     “Threshold Amount” has the meaning specified in Section 8.3(f).

     “Western Canada” means the provinces of Alberta, British Columbia, Manitoba and Saskatchewan
in Canada.

     “Working Capital” means Current Assets less Current Liabilities at any given date.

     1.2 Other Definitional Provisions.

     (a) All references in this Agreement to Exhibits, Schedules, Articles, Sections,
subsections and other subdivisions refer to the corresponding Exhibits, Schedules, Articles,
Sections, subsections and other subdivisions of or to this Agreement unless expressly
provided otherwise. Titles appearing at the beginning of any Articles, Sections,
subsections or other subdivisions of this Agreement are for convenience only, do not
constitute any part of this Agreement, and shall be disregarded in construing the language
hereof.

     (b) Exhibits and Schedules to this Agreement are attached hereto and by this reference
incorporated herein for all purposes.

     (c) The words “this Agreement,” “herein,” “hereby,” “hereunder” and
“hereof,” and words
of similar import, refer to this Agreement as a whole and not to any particular subdivision
unless expressly so limited. The words “this Article,” “this Section” and “this
subsection,” and words of similar import, refer only to the Article, Section or subsection
hereof in which such words occur. The word “or” is not exclusive, and the word “including”
(in its various forms) means including without limitation.

     (d) Pronouns in masculine, feminine or neuter genders shall be construed to state and
include any other gender, and words, terms and titles (including terms defined herein) in
the singular form shall be construed to include the plural and vice versa, unless the
context otherwise requires.

ARTICLE II

PURCHASE AND SALE

     2.1 Purchase and Sale. At the Closing, Purchaser shall purchase from Sellers, and Sellers
shall sell to Purchaser, the Shares on the terms and subject to the conditions set forth in this
Agreement.

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     2.2 Deposit.

     (a) On the date hereof, Purchaser shall pay to Sellers, by wire transfer to the account
designated by Sellers, in immediately available funds, a deposit in the amount of $1,000,000
(the “Deposit”).

     (b) In the event that this Agreement is terminated pursuant to Section 7.1(a), 7.1(b)
or 7.1(c) and Purchaser has fulfilled all of its covenants under Section 5.4, the Deposit
shall be returned to Purchaser within 10 days following such termination of this Agreement.

     2.3. Purchase Price; Adjustment; Dispute.

     (a) Contemporaneous with the conveyance and delivery of the Shares to Purchaser at the
Closing, Purchaser shall pay to Sellers, by wire transfer to the account designated by
Sellers, in immediately available funds, the sum of $22,000,000 (the “Closing Purchase
Price”), less the amount of the Deposit. The Closing Purchase Price shall be subject to
adjustment as set forth in Sections 2.3(b) and 2.3(c).

     (b) The Closing Purchase Price was determined based on the assumption that the Working
Capital at the Closing Date will be equal to the Target Working Capital. The Closing
Purchase Price is subject to adjustment as follows (without duplication):

     (i) Closing Date Adjusting Payments. No later than June 22, 2007, Sellers
shall have provided to Purchaser an estimated consolidated balance sheet of the
Midwest Group as at the Closing Date (“Estimated Closing Balance Sheet”). The
Closing Purchase Price shall be adjusted, as calculated based on the Estimated
Closing Balance Sheet (the “Closing Date Adjusting Payments”), as follows:

     (A) The Closing Purchase Price shall be reduced by the amounts of any
remaining interest bearing debt of the Midwest Group as of the Closing Date,
including all short-term and long-term debt, if any, together with any
remaining inter-company indebtedness, whether or not interest-bearing, if
any (the “Debt Load Adjustment”).

     (B) The Closing Purchase Price shall be adjusted by an amount equal to
the difference, if any, between Working Capital at the Closing Date and the
Target Working Capital as follows (the “Target Working Capital Adjustment”):

     (1) upward by the amount by which Working Capital, as reflected
on the Estimated Closing Balance Sheet, exceeds the Target Working
Capital, or

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     (2) downward by the amount by which Working Capital, as
reflected on the Estimated Closing Balance Sheet, is less than the
Target Working Capital.

     (C) The Closing Purchase Price shall be reduced by the amount of any
liabilities of the Midwest Group not included in those liabilities which
comprise the Debt Load Adjustment or the Target Working Capital Adjustment,
excluding long-term future income/deferred taxes of approximately $2,500,000
(the “Other Liabilities Adjustment”).

     (ii) Closing Balance Sheet. Within 80 days following the Closing Date,
Purchaser will cause the Midwest Group to prepare and provide to Sellers the
financial statements of the Midwest Group as of the Closing Date (the “Closing
Balance Sheet”) and the Adjustment Statement.

     (c) Dispute Resolution. The Adjustment Statement and any associated Purchase Price
adjustment shall become final and binding upon the Parties 30 days following the delivery to
Sellers of the Adjustment Statement, unless, within said 30-day period, Sellers notify
Purchaser of their objection thereto in writing, which objection may only be that the
Adjustment Statement was not properly prepared or computed in accordance with this
Agreement. Any notice of objection shall specify in reasonable detail the reasons for
objection. If Sellers so notify Purchaser of their objection to the Adjustment Statement,
Purchaser and Sellers shall negotiate in good faith to resolve any differences. If, within
30 days following the giving of such notice by Sellers to Purchaser (the “Resolution
Period”), any of such differences have not been resolved, then either Purchaser or Sellers
may submit the dispute to an independent accounting firm chosen by mutual agreement between
the Parties (the “Independent Accounting Firm”). The Independent Accounting Firm will
conduct its own review and evaluate those items or amounts in the Adjustment Statement
relevant to the calculation of the Current Assets, Current Liabilities, Working Capital,
Debt Load Adjustment and Other Liabilities Adjustment as of the Closing Date and shall
determine only those items still in dispute at the end of the Resolution Period and shall
determine whether such items have been prepared in accordance with the terms of this
Agreement. The Independent Accounting Firm will be granted reasonable access to all records
of Midwest and the Subsidiaries necessary for the conduct of such review, including the
Closing Balance Sheet, and the Parties agree to follow such procedures and make such
submissions to the Independent Accounting Firm as it may request in conducting its review
and making its determination under this Section 2.3(c). If so requested by the Independent
Accounting Firm, each Party agrees to execute a reasonable engagement letter. The
Independent Accounting Firm’s determination shall be made within 45 days after its
engagement, or as soon thereafter as possible, shall be set forth in a written statement
delivered to Purchaser and Sellers and shall become final, conclusive, non-appealable and
binding for all purposes hereunder upon delivery to Purchaser and Sellers. The
determination of the Independent Accounting Firm shall not be deemed an award subject to
review under any statute. The fees and expenses of the Independent Accounting Firm in
resolving any differences pursuant to this Section 2.3(c)
shall be paid by the Parties as

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determined by the Independent Accounting Firm, which
determination shall be made based on the resolution of the disputed items and the relative
degree of success of each Party in such disputes.

     (d) Post Closing Date Adjusting Payments. The Debt Load Adjustment, Target Working
Capital Adjustment and Other Liabilities Adjustment shall be re-calculated based upon the
Closing Balance Sheet (the “Post Closing Date Adjusting Payments”), and either (i) Purchaser
shall pay to Sellers any amount by which the Post Closing Date Adjusting Payments exceed the
Closing Date Adjusting Payments, or (ii) Sellers shall pay to Purchaser any amount by which
the Closing Date Adjusting Payments exceed the Post Closing Date Adjusting Payments. Any
Post Closing Date Adjusting Payments shall be paid to the relevant Party by certified check
or wire transfer to the account designated by such Party, in immediately available funds,
within 10 days after the Adjustment Statement becomes final.

ARTICLE III

CLOSING

     3.1 Closing. The Closing will take place at the offices of Blake, Cassels & Graydon LLP in
Calgary, Alberta, on June 29, 2007, to be effective July 1, 2007, at 12:01 a.m. Alberta time, or,
if the conditions to Closing set forth in this Agreement have not been satisfied by such date, on
the third business day following the day on which all such conditions have been satisfied or
waived, or at such other time and place as the Parties may mutually agree (the “Closing Date”). At
the Closing, Purchaser shall deliver the Closing Purchase Price, less the amount of the Deposit, by
wire transfer in immediately available funds, to Blake, Cassels & Graydon LLP, and Sellers shall
deliver the share certificates evidencing the Shares, together with duly executed assignments
separate from certificate, to Borden Ladner Gervais LLP, in each case to be held in escrow until
July 3, 2007, when these closing items shall be delivered to the Parties.

     3.2 Closing Obligations. At the Closing:

     (a) Sellers shall deliver to Purchaser:

     (i) The share certificates evidencing the Shares, together with duly executed
assignments separate from certificate, assigning and transferring the Shares to
Purchaser, free and clear of any and all Liens;

     (ii) Board of Director’s resolutions of AMEC, AMEC Americas and Midwest,
approving the transactions contemplated by this Agreement;

     (iii) Evidence, satisfactory to Purchaser in its sole discretion, of releases of
any and all Liens relating to the assets of the Midwest Group;

     (iv) Resignations and releases of all directors and officers of Midwest and the
Subsidiaries;

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          (v) The original books and records of the Midwest Group (including minute books
and all minutes and other records of meetings of directors and shareholder meetings);

          (vi) Fully executed Closing documents related to the internal restructuring of
the Midwest Group; and

          (vii) Such other certificates and instruments as Purchaser may reasonably
request to effectuate the transactions contemplated under this Agreement.

     (b) Purchaser shall deliver, or cause to be delivered, to Sellers:

          (i) The Closing Purchase Price, less the amount of the Deposit, by wire transfer
to the account designated by Sellers, in immediately available funds;

          (ii) Board of Director’s resolutions of Purchaser, approving the transactions
contemplated by this Agreement; and

          (iii) Such other certificates and instruments as Sellers may reasonably request
to effectuate the transactions contemplated under this Agreement.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES

     4.1 Representations and Warranties of Sellers. AMEC and AMEC Americas, jointly and severally,
hereby represent and warrant to Purchaser as follows:

     (a) Organization of Sellers.

          (i) AMEC is a corporation, duly organized, validly existing and in good standing under
the laws of Canada and has all requisite power and authority to own the Shares and to enter
into and perform its obligations under this Agreement and the other agreements and
instruments to be executed and delivered by it in connection with the transaction
contemplated hereby.

          (ii) AMEC Americas is a corporation, duly organized, validly existing and in good
standing under the laws of Canada and has all requisite power and authority to own the
Shares and to enter into and perform its obligations under this Agreement and the other
agreements and instruments to be executed and delivered by it in connection with the
transaction contemplated hereby.

     (b) Authority. Sellers have full power and authority to execute and deliver this Agreement
and to perform their obligations hereunder. Sellers have the lawful capacity to enter into this
Agreement without the need for consent or authorization of any other Person. No further action

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is
necessary on the part of Sellers for Sellers to execute and deliver this Agreement and to
consummate and perform their obligations hereunder.

     (c) Validity and Binding Effect. This Agreement has been duly executed and delivered on
behalf of Sellers and constitutes the legal, valid and binding obligation of Sellers, enforceable
against Sellers in accordance with its terms, except as the same may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the enforcement of
creditors’ rights generally and general equitable principles, regardless of whether enforceability
is considered in a proceeding at law or in equity.

     (d) Noncontravention. Except as set forth in Section 4.1(d) of the Disclosure Schedule,
neither the execution and delivery of this Agreement, nor the consummation of the transactions
contemplated hereby and compliance by Sellers with the provisions hereof will conflict with, result
in any violation of or default (with or without notice or lapse of time or both) under, give rise
to a right of termination, cancellation or acceleration of any obligation or to the loss of a
material benefit under any provision of (i) the certificate or articles of incorporation or bylaws
of AMEC and AMEC Americas; (ii) any loan or credit agreement, note, bond, mortgage, indenture,
lease, permit, concession, franchise, license, or other contract, agreement or instrument
applicable to AMEC or AMEC Americas; or (iii) any judgment, order, decree, statute, law, ordinance,
rule or regulation applicable to AMEC or AMEC Americas or any of their properties or assets.

     (e) Consents and Approvals. Except as set forth in Section 4.1(e) of the Disclosure Schedule:
(i) no consent, approval, order or authorization of, registration, declaration or filing with, or
permit from, any Governmental Authority is required by or with respect to either Seller, Midwest or
any of the Subsidiaries in connection with the execution and delivery of this Agreement by Sellers
or the consummation by Sellers of the transactions contemplated hereby, except for the filing of a
pre-merger notification under the Competition Act (Canada) and the expiration or termination of the
applicable waiting period thereunder; and (ii) no Third-Party Consent is required by or with
respect to either Seller, Midwest or any of the Subsidiaries in connection with the execution and
delivery of this Agreement or the consummation of the transactions contemplated hereby. Neither
Midwest nor any of the Subsidiaries provides any of the services or engages in any of the
activities of a business described in subsection 14.1(5) of the Investment Canada Act.

     (f) Title to the Shares. The Shares are held beneficially and of record by Sellers and are
being conveyed to Purchaser free and clear of any Lien, restriction on transfer (other than any
restrictions under applicable securities laws or as contained in the articles of incorporation of
Midwest), option, warrant, purchase right or other contract or commitment (other than this
Agreement).

     (g) Organization of Midwest and the Subsidiaries.

     (i) Midwest is a corporation duly organized, validly existing and in good standing
under the laws of Saskatchewan, Canada, and has the requisite corporate power and authority
to own, lease and operate its properties and to conduct its business as it is presently
being conducted. Midwest is duly qualified to do business in each jurisdiction where the
character

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of the properties owned or leased by it or the nature of its activities makes such
qualification necessary. Copies of the organizational documents of Midwest have heretofore
been delivered to Purchaser, and such copies are accurate and complete as of the date
hereof.

     (ii) MGCL is a Canadian federal corporation duly organized, validly existing and in
good standing under the laws of Canada, owned 100 percent by Midwest, and has the requisite
corporate power and authority to own, lease and operate its properties and to conduct its
business as it is presently being conducted. MGCL is duly qualified to do business in each
jurisdiction where the character of the properties owned or leased by it or the nature of
its activities makes such qualification necessary. Copies of the organizational documents of
MGCL have heretofore been delivered to Purchaser, and such copies are accurate and complete
as of the date hereof.

     (iii) MPRI is a Canadian federal corporation duly organized, validly existing and in
good standing under the laws of Canada, owned 100 percent by Midwest, and has the requisite
corporate power and authority to own, lease and operate its properties and to conduct its
business as it is presently being conducted. MPRI is duly qualified to do business in each
jurisdiction where the character of the properties owned or leased by it or the nature of
its activities makes such qualification necessary. Copies of the organizational documents of
MPRI have heretofore been delivered to Purchaser, and such copies are accurate and complete
as of the date hereof.

     (h) Investments. Except as set forth in Section 4.1(h) of the Disclosure Schedule: (i)
neither Midwest nor any of the Subsidiaries owns any equity interest in any other corporation,
general or limited partnership, joint venture, limited liability company or other business entity;
and (ii) neither Midwest nor any of the Subsidiaries has conducted any business other than the
Business.

     (i) Assets. Except as set forth in Section 4.1(i) of the Disclosure Schedule, Midwest and the
Subsidiaries have title to all of their properties and assets, both real and personal, tangible and
intangible, free and clear of any and all Liens. All of the assets used by the Midwest Group to
operate the Business in the manner in which the Business has been operated by the Midwest Group
prior to the Closing are owned or leased from an unrelated third party by the Midwest Group.

     (j) Financial Statements. Sellers have provided to Purchaser true and correct copies of (i)
the unaudited consolidated balance sheets of the Midwest Group as of December 31, 2005 and 2006,
and the unaudited statements of income for the Midwest Group for the years then ended; and (ii) the
unaudited consolidated balance sheet of the Midwest Group as of March 31, 2007, and the unaudited
consolidated statement of income for the Midwest Group for the three-month period then ended
(collectively, the “Midwest Group Financial Statements”). The Midwest Group Financial Statements
were prepared in accordance with GAAP applied on a consistent basis during the periods involved
(except, with respect to unaudited or interim statements, for the absence of footnotes and subject
to normal, recurring adjustments) and fairly present in all material respects the consolidated
financial position and results of operations of the Midwest Group as of their respective dates and
the results of operations of the Midwest Group for the periods presented therein. As of the
Effective Date, the Midwest Group has no liability or obligation of any nature (whether absolute,
accrued,

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contingent or otherwise) except as and to the extent (x) reflected or reserved against in
the Financial Statements or (y) disclosed in Section 4.1(j) of the Disclosure Schedule. Neither
Midwest nor any of the Subsidiaries has engaged in any hedging transactions. Neither AMEC, AMEC
Americas, Midwest nor any of the Subsidiaries has received written notice from any Governmental
Authority concerning noncompliance with, or deficiencies in, the financial reporting practices of
the Midwest Group. All material transactions have been properly recorded in the accounting records
underlying the Midwest Group Financial Statements. To the Knowledge of Sellers, no member of the
management of the Midwest Group or any other employee with a significant role in the internal
control of the Midwest Group over financial reporting has committed any act of fraud having a
material effect on the Midwest Group Financial Statements or has engaged in any transaction in
which such member of management of the Midwest Group or other employee with a significant role in
the internal control of the Midwest Group over financial reporting has had a personal financial
interest.

     (k) Capital Structure.

          (i) The authorized share capital of Midwest consists of an unlimited number of common shares
and Class B shares, of which only the Shares are issued and outstanding. All of the Shares were
validly issued and are fully paid and nonassessable. There are no other securities of Midwest of
any class authorized or outstanding. There are outstanding (A) no securities of Midwest or any
other Person convertible into or exchangeable or exercisable for equity interests in Midwest; and
(B) no subscriptions, options, warrants, calls, rights (including preemptive rights), commitments,
understandings or agreements to which Midwest is a party or by which it is bound obligating Midwest
to issue, deliver, sell, purchase, redeem or acquire equity interests in Midwest (or securities
convertible into or exchangeable or exercisable for equity interests in Midwest) or obligating
Midwest to grant, extend or enter into any such subscription, option, warrant, call, right,
commitment, understanding or agreement. Midwest is not subject to any proxy, voting trust
agreement or other contract, agreement, arrangement, commitment or understanding restricting or
otherwise relating to the voting, dividend, disposition or other rights with respect to the Shares,
except as set out in its articles of incorporation.

          (ii) The authorized share capital of MGCL consists of an unlimited number each of Class A
common voting shares, Class B common non-voting shares, Class P preferred shares and Class Q
preferred shares, of which only 100 shares of Class A common shares are issued and outstanding (the
“MGCL Shares”). All of the MGCL Shares were validly issued and are fully paid and nonassessable.
There are no other securities of MGCL of any class authorized or outstanding. There are
outstanding (A) no securities of MGCL or any other Person convertible into or exchangeable or
exercisable for equity interests in MGCL; and (B) no subscriptions, options, warrants, calls,
rights (including preemptive rights), commitments, understandings or agreements to which MGCL is a
party or by which it is bound obligating MGCL to issue, deliver, sell, purchase, redeem or acquire
equity interests in MGCL (or securities convertible into or exchangeable or exercisable for equity
interests in MGCL) or obligating MGCL to grant, extend or enter into any such
subscription, option, warrant, call, right, commitment, understanding or agreement. The MGCL
Shares are not subject to any proxy, voting trust agreement or other contract, agreement,
arrangement, commitment or understanding restricting or otherwise relating to the voting, dividend,

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disposition or other rights with respect to the MGCL Shares, except as set out in its articles of
incorporation.

          (iii) The authorized share capital of MPRI consists of an unlimited number of common shares
and an unlimited number of preferred shares, of which only 283,581 common shares are issued and
outstanding (the “MPRI Shares”). All of the MPRI Shares were validly issued and are fully paid and
nonassessable. There are no other securities of MPRI of any class authorized or outstanding.
There are outstanding (A) no securities of MPRI or any other Person convertible into or
exchangeable or exercisable for equity interests in MPRI; and (B) no subscriptions, options,
warrants, calls, rights (including preemptive rights), commitments, understandings or agreements to
which MPRI is a party or by which it is bound obligating MPRI to issue, deliver, sell, purchase,
redeem or acquire equity interests in MPRI (or securities convertible into or exchangeable or
exercisable for equity interests in MPRI) or obligating MPRI to grant, extend or enter into any
such subscription, option, warrant, call, right, commitment, understanding or agreement. The MPRI
Shares are not subject to any proxy, voting trust agreement or other contract, agreement,
arrangement, commitment or understanding restricting or otherwise relating to the voting, dividend,
disposition or other rights with respect to the MPRI Shares, except as set out in its articles of
incorporation.

     (l) Indebtedness and Guarantees. Except as set forth in Section 4.1(l) of the Disclosure
Schedule and except for Current Liabilities in the ordinary course of business, there are no notes,
mortgages, indentures, bonds, debentures, security agreements or other obligations or instruments
for or related to any borrowing effected by Midwest or any of the Subsidiaries or which have been
assumed or guaranteed by Midwest or any of the Subsidiaries. Except as set forth in Section 4.1(l)
of the Disclosure Schedule and/or in the Midwest Group Financial Statements, neither Midwest nor
any of the Subsidiaries is a party to any agreement of guarantee, indemnification or assumption of
the obligations of a third party, or other like commitment, contingent or otherwise, including
endorsements, inter-company guarantees (other than guarantees by Midwest of obligations of the
Subsidiaries and vice versa) and other contingent liabilities (whether written or oral).

     (m) Absence of Certain Changes or Events. Except as set forth in Section 4.1(m) of the
Disclosure Schedule or in the Midwest Group Financial Statements or as specifically contemplated by
this Agreement, since December 31, 2006, Midwest and the Subsidiaries have operated the Business
only in the usual and ordinary course and consistent with past practices, and neither Midwest nor
any of the Subsidiaries have done any of the following:

          (i) discharged or satisfied any Lien or paid any obligation or liability, absolute or
contingent, other than current liabilities incurred and paid in the ordinary course of
business and consistent with past practices;

          (ii) amended or taken any action to amend its certificate or articles of incorporation
or by-laws or constating documents or other governing documents;

          (iii) sold, leased, transferred, assigned or otherwise disposed of any assets that,
individually or in the aggregate, had a value at the time of such lease, transfer,
assignment or

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disposition of an aggregate of $50,000 or more, other than products sold,
leased, transferred, assigned or otherwise disposed of in the ordinary course of business
and consistent with past practices;

          (iv) made any investment in or contribution, advance, guarantee or loan to any Person
(other than investments, contributions or advances, or commitments with respect thereto,
less than $10,000 in the aggregate, made in the ordinary course of business and consistent
with past practices);

          (v) paid, loaned or advanced any amounts to, or sold, transferred or leased any of its
assets to, or entered into any other transactions with, any of its Affiliates outside the
Midwest Group;

          (vi) made any material change in any of the accounting principles followed by the
Midwest Group;

          (vii) made or entered into a commitment to increase benefits or benefit plan costs or
change bonus, insurance, pension, compensation or other benefit plans or arrangements or
grant any bonus or increase in wages, salary or other compensation or made any other change
in employment terms to any officers, directors or employees of Midwest or any of the
Subsidiaries;

          (viii) suffered any material adverse change in its financial condition (including
changes in working capital, assets, properties, liabilities, obligations or reserves) or
experienced any event or failed to take any action which reasonably could be expected to
result in such a material adverse change;

          (ix) suffered any loss, damage, destruction or other casualty (whether or not covered
by insurance) or loss of officers, employees, dealers, distributors, independent
contractors, customers, or suppliers or other favorable business relationships which
reasonably could be expected to result in a material adverse change of the kind referred to
in clause (viii) above;

          (x) issued, sold or otherwise disposed of any of its share capital or granted any
options, warrants or other rights to purchase or obtain (including upon conversion, exchange
or exercise) any of its share capital;

          (xi) made any loan to, or entered into any other transaction with, any of its
shareholders, directors, officers, or employees outside the ordinary course of business;

          (xii) delayed or postponed the payment of Accounts Payable or Current Liabilities
outside the ordinary course of business;

          (xiii) made or entered into or modified the terms of any oral or written employment or
collective bargaining agreement;

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          (xiv) granted any license or sublicense of any rights under or with respect to any
intellectual property; or

          (xv) agreed, whether in writing or otherwise, to do any of the foregoing.

     (n) Commitments. Neither AMEC, AMEC Americas, Midwest nor any of the Subsidiaries has entered
into any commitment (whether or not in writing) which may prevent or impede the transactions
contemplated by this Agreement.

     (o) Compliance with Laws. Except as set forth in Section 4.1(o) of the Disclosure Schedule:
(i) neither Midwest nor any of the Subsidiaries is in any material respect in violation of, or in
default under, and no event has occurred that (with notice or the lapse of time or both) would
constitute a material violation of or default under any applicable law, rule, regulation, order,
writ, decree or judgment of any Governmental Authority; and (ii) no investigation or review by any
Governmental Authority with respect to Midwest or any of the Subsidiaries is pending or, to the
knowledge of Sellers or the Midwest Group, threatened with respect to the Midwest Group or the
Business. Except as set forth in Section 4.1(o) of the Disclosure Schedule, neither Midwest nor
any of the Subsidiaries has received notice of any default which remains unremedied under any of
the provisions of the laws of Canada or any Province thereof or other applicable laws which, in the
aggregate, would have a Material Adverse Effect on the Midwest Group.

     (p) Permits. Section 4.1(p) of the Disclosure Schedule sets forth a full and complete list of
the Company Permits. The Midwest Group has obtained and holds all of the Company Permits. Except
as set forth in Section 4.1(p) of the Disclosure Schedule: (i) the Midwest Group and the
Subsidiaries are in compliance with the terms of the Company Permits; and (ii) Sellers are not
aware of any other permits, licenses, variances, exemptions, orders, franchises, approvals,
consents, registrations or authorizations of any Governmental Authorities that are required for the
lawful ownership, use and operation of the business and assets of the Midwest Group as currently
owned, used and operated.

     (q) Litigation. Except as set forth in Section 4.1(q) of the Disclosure Schedule: (i) no
litigation, arbitration, investigation or other proceeding of any Governmental Authority is pending
or, to the knowledge of Sellers or the Midwest Group, threatened against Midwest or any of the
Subsidiaries or any of their assets, with respect to any liability relating to any pending or
completed construction project or similar cause of action or otherwise; (ii) neither Midwest nor
any of the Subsidiaries is subject to any outstanding injunction, judgment, order, decree or
ruling; and (iii) during the past five years, neither Midwest nor any of the Subsidiaries has been
a party to any litigation, arbitration or other proceeding. There is no litigation, proceeding or
investigation pending
or, to the knowledge of AMEC, AMEC Americas or the Midwest Group, threatened against or affecting
AMEC, AMEC Americas or the Midwest Group that questions the validity or enforceability of this
Agreement or any other document, instrument or agreement to be executed and delivered by AMEC, AMEC
Americas or the Midwest Group in connection with the transactions contemplated hereby.

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     (r) No Restrictions. Except as set forth in Section 4.1(r) of the Disclosure Schedule,
neither Midwest nor any of the Subsidiaries is a party to any agreement, contract or commitment
limiting in any respect its ability to compete with any Person or otherwise conduct business of any
line or nature or in any geographical area.

     (s) Environmental Matters. Except as set forth in Section 4.1(s) of the Disclosure Schedule,
or as disclosed in the Environmental Reports:

          (i) Midwest and the Subsidiaries have conducted their businesses and owned and operated
their assets, and are conducting their businesses and operating their assets, in compliance
with all Environmental Laws;

          (ii) Neither Midwest nor any of the Subsidiaries has been notified by any Governmental
Authority or other third party that any of its operations or assets is the subject of any
investigation or inquiry by any Governmental Authority or other third party evaluating
whether any material remedial action is needed to respond to a release of any Hazardous
Material or to the improper storage or disposal (including storage or disposal at off-site
locations) of any Hazardous Material;

          (iii) Neither Midwest nor any of the Subsidiaries, nor, to the knowledge of Sellers or
the Midwest Group, any other Person has filed any notice under any federal, provincial,
state or local law indicating that (A) Midwest or any of the Subsidiaries is responsible for
the improper release into the environment, or the improper storage or disposal, of any
Hazardous Material, or (B) any Hazardous Material is or has been improperly stored or
disposed of upon any property owned, leased or operated or formerly owned, leased or
operated by Midwest or any of the Subsidiaries;

          (iv) To the Knowledge of Sellers, no property now or previously owned, leased or
operated by Midwest or any of the Subsidiaries is listed on any Governmental Authority list
as a site requiring investigation or cleanup;

          (v) There are no sites, locations or operations at which Midwest or any of the
Subsidiaries is currently undertaking, or has completed, any removal, remedial or response
action relating to any disposal or release, as required by Environmental Laws; and

          (vi) Sellers have accurately disclosed to Purchaser the presence and location of all
the underground storage tanks and underground holding/collection tanks.

     (t) Intellectual Property. Section 4.1(t) of the Disclosure Schedule sets forth a complete
and accurate list of all Intellectual Property Rights that are held by the Midwest Group and that
are used in the operation of the Business as currently conducted by the Midwest Group. Except as
set forth in Section 4.1(t) of the Disclosure Schedule: (i) Midwest or a Subsidiary holds valid
and continuing authority in connection with the use of such Intellectual Property Rights; (ii) the
conduct of the Business and the use of the Intellectual Property Rights do not infringe any
intellectual property right or any other proprietary right of any Person; (iii) neither AMEC, AMEC

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Americas, Midwest nor any of the Subsidiaries has received any written notice from any Person
pertaining to or challenging the right of Midwest or any of the Subsidiaries to use any of the
Intellectual Property Rights; (iv) Midwest and the Subsidiaries do not own or use any Intellectual
Property Right pursuant to a license and have not granted any Person any rights to use Intellectual
Property Rights; (v) to the Knowledge of Sellers, no employee of Midwest or any of the Subsidiaries
is subject to any agreement with a prior employer or other Person that in any way adversely affects
or will adversely affect the Business or the performance of the employee’s duties as an employee;
and (vi) Midwest and the Subsidiaries have taken all reasonable precautions to protect the secrecy,
confidentiality and value of their trade secrets and other confidential Intellectual Property
Rights.

     (u) Insurance. Section 4.1(u) of the Disclosure Schedule sets forth a complete and accurate
list of all insurance policies maintained by Sellers or Sellers’ Affiliates which are material and
relevant to the Midwest Group, along with an indication of which policies are maintained by the
Midwest Group and which are maintained by Sellers or other Persons for the Midwest Group. None of
such policies or binders was obtained through the use of materially false or misleading information
or the failure to provide the insurer with all information requested in order to evaluate the
liabilities and risks insured. There is no default by the Midwest Group with respect to any
provision contained in any such policy or binder, and the Midwest Group has not failed to give any
notice or present any claim under any such policy or binder in due and timely fashion. There are
no billed but unpaid premiums past due under any such policy or binder. Section 4.1(u) of the
Disclosure Schedule also sets forth a complete and accurate list of all liability insurance
policies maintained by or for the Midwest Group during the past five years.

     (v) Contracts and Agreements. Section 4.1(v) of the Disclosure Schedule contains a complete
and accurate list of the Company Contracts and any and all oral agreements, contracts and
commitments of the same nature as those written agreements, contracts and commitments listed in the
definition of Company Contracts in Section 1.1. Except as described in Section 4.1(v) of the
Disclosure Schedule: (i) each Company Contract is in full force and effect and is enforceable in
accordance with its terms; (ii) Midwest and the Subsidiaries have performed in all material
respects all the obligations required to be performed by them under the Company Contracts; (iii) to
the Knowledge of Sellers, there has been no threatened cancellation or termination of any of the
Company Contracts and there are no outstanding disputes thereunder; (iv) each of the Company
Contracts is with an unrelated third party and was entered into on an arm’s-length basis; (v) no
event, act or omission has occurred which (with or without notice, lapse of time or the happening
or occurrence of any other event) would result in a material default by Midwest or any of the
Subsidiaries thereunder or would cause the termination thereof; (vi) neither Midwest nor any of the
Subsidiaries has received notice of the exercise or attempted exercise of premature termination or
force majeure rights by any other party to a Company Contract; (vii) no consent of any third party
is required under any Company Contract as a result of or in connection with, and the enforceability
of any Company Contract will not be affected in any manner by, the execution, delivery and
performance of this Agreement; and (viii) all projects of the Midwest Group that are under contract
have been adequately bonded and/or insured.

     (w) Customers/Clients and Suppliers. Section 4.1(w) of the Disclosure Schedule contains a
complete and accurate list of (i) the five largest customers/clients of the Midwest Group

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(based on
2005 and 2006 sales), together with the volume of the revenues received from each such
customer/client during 2005 and 2006, and (ii) the 10 largest suppliers to the Midwest Group (based
on 2005 and 2006 purchases), together with the volume of the purchases made from each such supplier
during 2005 and 2006. To the knowledge of AMEC, AMEC Americas and the Midwest Group, none of such
customers/clients or suppliers intends to cease working with, or selling to, the Midwest Group or
to materially alter the amount of such transactions or projects as a result of the transactions
contemplated hereby or otherwise. Except for investments(s) in publicly traded entities (any such
investment individually not exceeding one percent of the equity of such entity) or investments in
government bonds or securities, neither AMEC nor AMEC Americas has any direct or indirect interest
in any competitor, supplier or customer of the Midwest Group or in any person from whom or to whom
the Midwest Group leases any real or personal property, or in any person with whom the Midwest
Group has any contract, agreement, understanding, business arrangement or relationship.

     (x) Real Property. Section 4.1(x) of the Disclosure Schedule sets forth a complete and
accurate list of all real property and facilities owned, leased or operated by Midwest and the
Subsidiaries at the present time or at any time during the past five years. Except as set forth in
Section 4.1(x) of the Disclosure Schedule:

     (i) The real property currently owned or under lease to Midwest and the Subsidiaries
constitutes all the interests in real property held for use or used in connection with the
business of the Midwest Group as presently conducted;

     (ii) There are no eminent domain or other similar proceedings pending or, to the
Knowledge of Sellers and the Midwest Group, threatened affecting any portion of the real
property currently owned or under lease to Midwest or any of the Subsidiaries;

     (iii) There is no writ, injunction, decree, order or judgment outstanding, nor any
action, claim, suit or proceeding, pending or, to the Knowledge of Sellers and the Midwest
Group, threatened, contesting, prohibiting or restricting the ownership, lease, use,
occupancy or operation by the Midwest Group of any such real property;

     (iv) The use and operation of the owned or leased real property in the present conduct
of the business of the Midwest Group do not violate in any material respect any instrument
of record or agreement affecting such real property, and there is no violation of any
covenant, condition, restriction, easement or order of any Governmental Authority having
jurisdiction over such property or of any other Person entitled to enforce the same
affecting such real property or the use or occupancy thereof; and

     (v) All covenants and obligations set forth in the Caveat regarding Restrictive
Covenant registered as Instrument No. 762 103 305 have been complied with.

     (y) Leases. Section 4.1(y) of the Disclosure Schedule contains a true and complete list of
all leases of real and personal property to which Midwest or any of the Subsidiaries is a party.
Each such lease is valid, binding and enforceable in accordance with its terms and is in full force
and

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effect. Except as set forth on Section 4.1(y) of the Disclosure Schedule, neither Midwest nor
any of the Subsidiaries has violated the terms of any capital or operating lease to which such
entity is a party, and there are no equipment leases with a legal requirement to purchase such
leased equipment prior to the expiration of the lease term as a result of over-hour charges on the
leased equipment.

     (z) Inventory. The Inventory reflected on the consolidated balance sheets of the Midwest
Group included in the Midwest Group Financial Statements, and any other inventory acquired by or
for the Midwest Group since the date thereof consists of items of a quality, quantity and condition
usable in the ordinary course of business by the Midwest Group, except for obsolete, unusable, not
readily saleable or below-standard quality items, all of which have been either written off or
written down to net realizable value in the Midwest Group Financial Statements.

     (aa) Employee Benefit Plans.

          (i) Section 4.1(aa) of the Disclosure Schedule sets forth a complete and accurate list
of all Company Employee Benefit Plans. Except for the Company Employee Benefit Plans,
neither Midwest nor any of the Subsidiaries has any fixed or contingent liability with
respect to any employee benefit, pension or other plan (whether written or oral). No
bonuses, incentive awards or fringe benefits, other than those listed in Section 4.1(aa) of
the Disclosure Schedule, have been promised (either orally or in writing) to any employee,
director, officer or agent of Midwest or any of the Subsidiaries.

          (ii) There is no material violation of applicable law with respect to the filing of
applicable reports, documents and notices regarding any Company Employee Benefit Plan with
any Governmental Authority or the furnishing of such documents to the participants or
beneficiaries of the Company Employee Benefit Plans.

          (iii) With respect to the Company Employee Benefit Plans, there exists no condition or
set of circumstances that could be expected to result in liability under any applicable law.

          (iv) With respect to the Company Employee Benefit Plans, individually and in the
aggregate, there are no unfunded benefit obligations (including severance obligations) which
have not been accounted for by reserves, or otherwise properly footnoted in accordance with
GAAP, on the Midwest Group Financial Statements.

          (v) Except as set forth in Section 4.1(aa) of the Disclosure Schedule: (A) Midwest and
the Subsidiaries have performed all obligations, whether arising by operation of law or by
contract required to be performed by them in connection with the Company Employee Benefit
Plans, and, to the Knowledge of Sellers and the Midwest Group, there have been no defaults
or violations by any other party to any of the Company Employee Benefit Plans; (B) all
reports, returns, notices, disclosures and other documents relating to the Company Employee
Benefit Plans required to be filed with or furnished to governmental entities, plan
participants or plan beneficiaries have been timely filed or furnished in accordance with
applicable law and each Company Employee Benefit Plan has

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been administered in compliance
with its governing documents; (C) there are no actions, suits or claims pending (other than
routine claims for benefits) or, to the Knowledge of Sellers and the Midwest Group,
contemplated or threatened against, or with respect to, any of the Company Employee Benefit
Plans or their assets; (D) all contributions required to be made to the Company Employee
Benefit Plans have been made timely; (E) no act, omission or transaction has occurred which
could result in imposition on Midwest or any of the Subsidiaries of breach of fiduciary duty
liability damages, a civil penalty assessed or a tax imposed pursuant to applicable law; (F)
there is no matter pending with respect to any of the Company Employee Benefit Plans before
any Governmental Authority; (G) each of the Company Employee Benefit Plans complies, in form
and operation with applicable law; (H) neither Midwest nor any of the Subsidiaries has any
liabilities or other obligations, whether actual or contingent, with respect to any Company
Employee Benefit Plan, including liability for post-retirement medical benefits,
post-retirement life insurance benefits, continuation coverage or severance benefits; and
(I) neither AMEC, AMEC Americas, Midwest nor any of the Subsidiaries nor any present or
former director or officer of, or any employee or other agent of, Midwest or any of the
Subsidiaries has made any written or oral representations or promises to any present or
former director, officer, employee or other agent concerning his or her terms, conditions or
benefits of employment, including the tenure of any such employment or the conditions under
which such employment may be terminated by Midwest or any of the Subsidiaries, which will be
binding upon or enforceable against Midwest or any of the Subsidiaries after the Closing.

          (vi) Neither Midwest, any of the Subsidiaries nor any of the Company Employee Benefit
Plans has any obligation or commitment with respect to retirees.

          (vii) The Company Employee Benefit Plans have been maintained, in all material
respects, in accordance with their terms and in accordance with all applicable laws, and
neither Midwest, any of the Subsidiaries, nor any “party in interest” or “disqualified
person” with respect to the Company Employee Benefit Plans, has engaged in any prohibited
transaction under applicable law.

          (viii) Neither the execution and delivery of this Agreement nor the consummation of the
transactions contemplated hereby will result in any payment becoming due to any employee or
group of employees of Midwest or any of the Subsidiaries.

          (ix) True, correct and complete copies of each of the Company Employee Benefit Plans,
and related trusts, if applicable, including all amendments thereto, have been furnished to
Purchaser.

          (x) Except as set forth in Section 4.1(aa) of the Disclosure Schedule, no employee of
Midwest or any of the Subsidiaries is currently on a leave of absence due to sickness or
disability and no claim is pending or expected to be made by an employee, former employee or
independent contractor of Midwest or any of the Subsidiaries for workers’ compensation or
similar benefits.

Share Purchase Agreement (Final)

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       (bb) Employment Contracts. Except as set forth in Section 4.1(bb) of the Disclosure Schedule,
or as contemplated by this Agreement:

          (i) Neither Midwest nor any of the Subsidiaries is subject to or obligated under any
agency, consulting, employment, severance, termination or similar arrangement, or any share
option, share purchase or similar plan or other similar arrangement, entered into or
maintained for the benefit of its employees or any other Person, or any agreement that
provides for a payment on termination other than what would be implied under common law; and

          (ii) No employee of Midwest or any of the Subsidiaries or any other Person owns, or has
any right granted by Midwest or any of the Subsidiaries to acquire, any interest in any of
the assets or the business of Midwest or any of the Subsidiaries.

       (cc) Labour Matters.

          (i) Sellers have previously provided to Purchaser a complete and accurate list of all
of the employees of Midwest and the Subsidiaries, showing each such employee’s position and
total compensation.

          (ii) Section 4.1(cc) of the Disclosure Schedule contains a true and correct list of
all collective bargaining agreements and other labour agreements with any labour union or
employee association affecting the Midwest Group. Except as set forth in Section 4.1(cc) of
the Disclosure Schedule: (A) such agreements are in full force and effect, (B) neither
Midwest nor any of the Subsidiaries is in breach or default under any of such agreements,
and (C) there is no pending or, to the Knowledge of Sellers or the Midwest Group, threatened
labour dispute, grievance, strike or work stoppage by the employees of Midwest or any of the
Subsidiaries. Except as set forth in Section 4.1(cc) of the Disclosure Schedule, neither
Midwest nor any of the Subsidiaries has made any commitments to or conducted negotiations
with any labour union or employee association with respect to any future agreements and
there have not been any attempts to organize, certify or establish any labour union or
employee association.

          (iii) Midwest and the Subsidiaries are in compliance with all laws, rules, regulations
and orders relating to the employment of labour, including all such laws, rules, regulations
and orders relating to wages, hours, collective bargaining, occupational health and safety,
workers’ hazardous materials, employment standards, pay equity, language of work and
workers’ compensation. There are no outstanding inquiries, charges or complaints against
Midwest or any of the Subsidiaries relating to unfair labour practices, unjust dismissal,
non-compliance with any legal obligation in relation to any employees, discrimination,
harassment, non-compliance with health and safety in the workplace legislation or under any
legislation to any employees. Each of Midwest and the Subsidiaries has paid in full all
amounts owing under all applicable workers’ compensation legislation in the provinces in
which it conducts operations, and the workers’ compensation claims

Share Purchase Agreement (Final)

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experienced in connection
with the operation of the businesses of the Midwest Group would not entail additional
monetary obligations for the period ending at the Closing.

          (iv) With respect to any termination of employment of any employee of Midwest or any
Subsidiary which has occurred before the Closing, each of Midwest and the Subsidiaries, as
applicable, has paid, or accrued on the Financial Statements, in full all amounts,
obligations and debts owing to any such terminated employees, including all wages, salary,
bonuses, commissions, vacation, holiday pay and severance amounts in lieu of notice of
termination.

       (dd) Accounts Receivable. All of the accounts, notes and loans receivable that have been
recorded on the books of the Midwest Group are bona fide and represent accounts receivable validly
due for services rendered in the ordinary course of business.

       (ee) Taxes. Except as set forth in Section 4.1(ee) of the Disclosure Schedule:

          (i) Midwest and each of the Subsidiaries have (A) timely filed with all applicable tax
authorities all federal, provincial and local returns, reports, designations, elections and
statements required to be filed by it or on its behalf with respect to any Taxes (“Tax
Returns”), and all such Tax Returns dated after 2001 have been provided to Purchaser and are
true, complete and accurate in all material respects; and (B) timely withheld from employee
wages and payments to non-residents and paid over to the proper Governmental Authorities all
amounts required to be so withheld and paid over. Each of Midwest and the Subsidiaries has
fulfilled all requirements under the Tax Act and the regulations thereto, the Canada Pension
Plan, the Employment Insurance Act (Canada) and any other applicable provincial legislation,
providing for the payment or withholding of any sum, fee, assessment or other payment in
relation to the employees of Midwest and the Subsidiaries and has remitted all amounts
withheld to the appropriate authorities within the prescribed times;

          (ii) None of Sections 79, 80, 80.01, 80.02, 80.03 or 80.04 of the Tax Act, or any
equivalent provision of the tax legislation of any province or any other jurisdiction, have
applied or will apply to Midwest or any of the Subsidiaries at any time up to and including
the Closing Date;

          (iii) Midwest and each of the Subsidiaries has paid to all applicable tax authorities
all Taxes and all installments of Taxes required to be paid by it, and no portion of any
such Taxes is outstanding;

          (iv) Neither Midwest nor any of the Subsidiaries is subject to or a party to any audit,
assessment, reassessment, determination of loss, reclassification of assets, objection, or
appeal with respect to any Taxes or any matter required to be disclosed in any Tax Return or
to any agreement to extend the time to file any Tax Return or limitation period for the
assessment or collection of any taxes, and to the best of Sellers’ knowledge, no tax
authority has threatened to initiate or is considering initiating any such action with
respect to Taxes or Tax Returns; and

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          (v) Each of Midwest and the Subsidiaries is duly registered for the purposes of Part IX
of the Excise Tax Act (Canada) with respect to goods and services tax and Midwest’s
registration number is 12341 7438 RT0001, MGCL’s registration number is 12830 5638 RT0001
and MPRI’s registration number is 89472 8567 RT0001.

       (ff) Tangible Personal Property. Section 4.1(ff) of the Disclosure Schedule contains a true
and complete list of each item of Tangible Personal Property which the Midwest Group owns or
purports to own having a fair market value of $37,500 or greater.

       (gg) Absence of Certain Business Practices. Neither Midwest nor any of the Subsidiaries, nor
any of their partners, officers, directors, managers, employees or agents, nor any other Person
acting on any of their behalf, has, directly or indirectly, given or agreed to give any gift or
similar benefit (other than with respect to bona fide payments for which adequate consideration has
been given) to any customer, supplier, governmental employee or other Person who is or may be in a
position to help or hinder the business of Midwest or any of the Subsidiaries (or assist Midwest or
any of the Subsidiaries in connection with any actual or proposed transaction): (i) which might
subject Midwest or any of the Subsidiaries or their Affiliates to any damage or penalty in any
civil, criminal or governmental litigation or proceeding, including with respect to the FCPA; (ii)
which, if not continued in the future, would have a Material Adverse Effect on the Midwest Group or
which might subject Midwest or any of the Subsidiaries to suit or penalty in any private or
governmental litigation or proceeding; or (iii) for establishment or maintenance of any concealed
fund or concealed bank account. Neither Midwest nor any of the Subsidiaries has received or
otherwise had or obtained Knowledge of any complaint, allegation, assertion or claim, whether
written or oral, alleging fraud or suspected fraud affecting Midwest or any of the Subsidiaries.

     (hh) Books and Records. All books, records and files of the Midwest Group (i) have been
prepared, assembled and maintained in accordance with usual and customary policies and procedures;
and (ii) fairly and accurately reflect the ownership, use, enjoyment and operation by Midwest and
the Subsidiaries of their assets and the Business. The minute books of Midwest and the
Subsidiaries contain complete and accurate records of the actions of the shareholders and directors
of Midwest and the Subsidiaries.

     (ii) Powers of Attorney; Authorized Signatories. Section 4.1(ii) of the Disclosure Schedule
lists (i) the names and addresses of all persons holding powers of attorney on behalf of Midwest or
any of the Subsidiaries; and (ii) the names of all banks and other financial institutions in which
Midwest or any of the Subsidiaries currently has an account, deposit or safe deposit box, along
with the account numbers and the names of all persons authorized to draw on such accounts or
deposits or to have access to such boxes.

     (jj) Agreements with Sellers. Except as set forth in Section 4.1(jj) of the Disclosure
Schedule, there are no agreements or contracts in existence between AMEC, AMEC Americas or any of
their Affiliates (other than the Midwest Group) and Midwest or any of the Subsidiaries which extend
beyond the Closing.

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     (kk) Bankruptcy and Insolvency Matters. No action or proceeding has been commenced or filed
by or against AMEC, AMEC Americas, Midwest or any of the Subsidiaries or which seeks or may lead to
receivership, bankruptcy, a consumer proposal or any other similar proceeding in respect of AMEC,
AMEC Americas, Midwest or any of the Subsidiaries, the adjustment, compromise or composition of
claims against AMEC, AMEC Americas, Midwest or any of the Subsidiaries or the appointment of a
trustee, receiver, liquidator, custodian or other similar officer for AMEC, AMEC Americas, Midwest
or any of the Subsidiaries or any portion of their assets. No such action or proceeding has been
authorized or is being considered by or on behalf of AMEC, AMEC Americas, Midwest or any of the
Subsidiaries and no creditor of AMEC, AMEC Americas, Midwest or any of the Subsidiaries has
threatened to commence or advised that it may commence, any such action or proceeding.

     (ll) Resident of Canada. Neither AMEC nor AMEC Americas is a non-resident of Canada for
purposes of the Tax Act.

     (mm) Unanimous Shareholder Agreements. Any and all prior unanimous shareholder, pooling,
escrow or similar agreements respecting Midwest and the Subsidiaries have been terminated.

     (nn) Remuneration of Certain Persons. Except for payment or reimbursement of expenses,
repayment of loans, payment of management fees, dividends and salaries payable in the ordinary
course, consistent with past practice (the details of which have been provided to Purchaser), no
payments have been made or authorized since December 31, 2006, by Midwest or any of the
Subsidiaries to any of their officers, directors, shareholders or employees, or former officers,
directors, shareholders or employees, or to any Person or company not dealing at arm’s length (as
such term is defined in the Tax Act) with Midwest or any of the Subsidiaries, or any such Person.

     (oo) Delivery of Documents. True and complete copies of all written instruments described or
listed on the Disclosure Schedule have been delivered or made available to Purchaser.

     (pp) Disclosure. No representation or warranty of AMEC or AMEC Americas set forth in this
Agreement or in any of the Schedules or Exhibits hereto, or other statement in writing or
certificate furnished or to be furnished to Purchaser by or on behalf of AMEC or AMEC Americas in
connection with the transactions contemplated hereby, contains any untrue statement of a material
fact or omits to state a material fact necessary in order to make the statements contained herein
or therein not misleading in light of the circumstances in which they are made.

     4.2. Representations and Warranties of Purchaser. Purchaser hereby represents and warrants to
Sellers as follows:

     (a) Organization of Purchaser. Purchaser is a corporation duly organized, validly existing
and in good standing under the laws of British Columbia, Canada, and has all requisite power and
authority to own its properties and to enter into and perform its obligations under this Agreement
and the other agreements and instruments to be executed and delivered by it in connection with the
transaction contemplated hereby.

Share Purchase Agreement (Final)

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     (b) Authority. Purchaser has full power and authority to execute and deliver this Agreement
and to perform its obligations hereunder. The execution, delivery and performance of this
Agreement by Purchaser have been duly authorized by all necessary corporate and other action, and
no further corporate or other action is necessary on the part of Purchaser for Purchaser to execute
and deliver this Agreement and to consummate and perform its obligations hereunder.

     (c) Validity and Binding Effect. This Agreement has been executed and delivered on behalf of
Purchaser and constitutes the legal, valid and binding obligation of Purchaser, enforceable against
Purchaser in accordance with its terms, except as the same may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the enforcement of creditors’
rights generally and general equitable principles, regardless of whether enforceability is
considered in a proceeding at law or in equity.

     (d) Noncontravention. The execution and delivery of this Agreement do not, and the
consummation of the transactions contemplated hereby and compliance by Purchaser with the
provisions hereof will not, conflict with, result in any violation of or default (with or without
notice or lapse of time or both) under, give rise to a right of termination, cancellation or
acceleration of any obligation or to the loss of a material benefit under, any provision of (i) the
Certificate or Articles of Incorporation or Bylaws of Purchaser; (ii) any loan or credit agreement,
note, bond, mortgage, indenture, lease, permit, concession, franchise, license or other contract,
agreement or instrument applicable to Purchaser; or (iii) any judgment, order, decree, statute,
law, ordinance, rule or regulation applicable to Purchaser or any of its properties or assets.

     (e) Consents and Approvals. No consent, approval, order or authorization of, registration,
declaration or filing with, or permit from, any Governmental Authority is required by or with
respect to Purchaser in connection with the execution and delivery of this Agreement by Purchaser
or the consummation by Purchaser of the transactions contemplated hereby, except for the filing of
a pre-merger notification under the Competition Act (Canada) and the expiration or termination of
the applicable waiting period thereunder. No Third-Party Consent is required by or with respect to
Purchaser in connection with the execution and delivery of this Agreement or the consummation of
the transactions contemplated hereby.

     (f) Litigation. There is no litigation, proceeding or investigation pending or, to the
knowledge of Purchaser, threatened against or affecting Purchaser that questions the validity or
enforceability of this Agreement or any other document, instrument or agreement to be executed and
delivered by Purchaser in connection with the transactions contemplated hereby.

     (g) Funding. Purchaser has available adequate funds in an aggregate amount sufficient to pay
(i) all amounts required to be paid to Sellers upon and following the Closing under this Agreement,
and (ii) all expenses incurred or which will be incurred by Purchaser in connection with this
Agreement and the transactions contemplated hereby.

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     (h) Investment Intent. Purchaser is acquiring the Shares for its own account for investment
and not with a view to, or for sale in connection with, any distribution thereof, except in
compliance with applicable securities laws.

     (i) Disclosure. No representation or warranty of Purchaser set forth in this Agreement or in
any of the Schedules or Exhibits hereto, or other statement in writing or certificate furnished or
to be furnished to Sellers by or on behalf of Purchaser in connection with the transactions
contemplated hereby, contains any untrue statement of a material fact or omits to state a material
fact necessary to make the statements contained herein or therein not misleading in light of the
circumstances in which they are made.

ARTICLE V

COVENANTS

     5.1 Conduct of Business by the Midwest Group Pending Closing. During the period from the
Effective Date to the Closing, Sellers shall cause Midwest and the Subsidiaries to operate their
businesses in the ordinary course and shall use all commercially reasonable efforts to preserve in
all material respects the business organizations (subject to Section 5.8), assets, prospects and
advantageous business relationships of the Midwest Group and to maintain satisfactory relationships
with the licensors, licensees, suppliers, contractors, distributors, customers and others having
advantageous business relationships with the Midwest Group, and except as may be contemplated by
this Agreement or with the prior written consent of Purchaser, which consent shall not be
unreasonably withheld or delayed, shall not permit Midwest or any of the Subsidiaries to take any
of the following actions:

     (a) authorize or effect any change in its Organizational Documents (subject to Section
5.8);

     (b) grant any options, warrants or other rights to purchase or obtain any of its share
capital or issue, sell or otherwise dispose of any of its share capital;

     (c) issue any note, bond or other debt security or create, incur, assume or guarantee
any indebtedness for borrowed money or capitalized lease obligation;

     (d) impose any security interest upon any of its assets;

     (e) make any capital investment in, make any loan to, or acquire the securities or
assets of any other Person;

     (f) make any change in employment terms for any of its directors, officers or employees
outside the ordinary course of business;

     (g) enter into, adopt or amend any employment agreement or pension plan, or grant, or
become obligated to grant, any increase in the compensation payable or to become payable to
any of its officers, managers or directors or any general increase in the

Share Purchase Agreement (Final)

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compensation
payable or to become payable to its employees, except for such actions as are otherwise
specifically provided for herein;

     (h) acquire (including by lease) any material assets or properties or dispose of,
mortgage or encumber any material assets or properties, other than in the ordinary course of
business;

     (i) waive, release, grant or transfer any material rights or modify or change in any
material respect any material existing license, lease, contract or other document, other
than in the ordinary course of business and other than actions otherwise contemplated by
this Agreement;

     (j) make any capital expenditure, unless such expenditure is disclosed in Section 5.1
of the Disclosure Schedule or is less than $50,000;

     (k) issue any bid or enter into, change or modify a Company Contract;
or

     (l) commit to any of the foregoing.

     5.2 Access to Assets, Personnel and Information.

     (a) From the date hereof until the Closing, Sellers will afford to Purchaser, at
Purchaser’s sole risk and expense, access at reasonable times to any of the assets, books
and records, contracts, facilities, audit work papers and payroll records of the Midwest
Group and shall, upon request, furnish promptly to Purchaser (at Purchaser’s expense) a copy
of any file, book, record, contract, permit, correspondence, or other written information,
document or data concerning the Midwest Group (or its assets) that is within the possession
or control of AMEC, AMEC Americas or the Midwest Group. During such period, Sellers will
make available to Purchaser office space and facilities at the office facilities of the
Midwest Group. Notwithstanding the foregoing, no investigation pursuant to this Section
5.2(a) will affect or be deemed to modify any of the representations or warranties made by
Sellers in this Agreement. The confidentiality of all such documents and information
furnished to Purchaser
shall be maintained by Purchaser and treated the same as Purchaser would treat its own
confidential information.

     (b) Purchaser shall have the right and opportunity to make a physical assessment of the
assets of the Midwest Group and, in connection therewith, shall have the right to enter and
inspect such assets and all buildings and improvements thereon. Sellers shall be provided
48 hours prior notice of any such inspection, and Sellers shall have the right to witness
all such inspections; provided, however, that Purchaser shall cause the Purchaser
Representatives to conduct themselves at all times while on premises of the Midwest Group in
a manner likely to cause the least possible disruption to the business activities of the
Midwest Group. Purchaser shall keep any data or information acquired by any such
examinations and the results of any analyses of such data and information strictly
confidential and will not disclose any of such data, information or results to any Person

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unless otherwise required by law or regulation and then only after written notice to Sellers
of the determination of the need for disclosure. Purchaser shall indemnify, defend and hold
Sellers harmless from and against any and all claims to the extent arising out of or as a
result of the activities of Purchaser on the assets of the Midwest Group in connection with
conducting such physical assessment, except to the extent of and limited by the negligence
or willful misconduct of AMEC, AMEC Americas or the Midwest Group or any representative of
AMEC, AMEC Americas or the Midwest Group.

     (c) From the date hereof until the Closing, Sellers shall cause the Midwest Group to
fully and accurately disclose to Purchaser and the Purchaser Representatives all information
that is (i) reasonably requested by Purchaser or any of the Purchaser Representatives, (ii)
known to Midwest or any of the Subsidiaries, and (iii) relevant in any manner or degree to
the value, ownership, use, operation, development or transferability of the assets of the
Midwest Group.

     (d) Each of AMEC and AMEC Americas agrees that it will not (and will cause its
directors and officers not to), and Purchaser agrees that it will not (and will cause the
officers of Purchaser not to), use any information obtained pursuant to this Section 5.2 for
any purpose unrelated to the consummation of the transactions contemplated by this
Agreement.

     5.3 No Solicitation. Immediately following the execution of this Agreement, Sellers shall
not, and shall not permit the Midwest Group to, solicit, initiate, knowingly encourage the
submission of, or conduct discussions or negotiations with respect to any offer or proposal to
acquire all or any part of the Shares or all or any material portion of the assets or business of
the Midwest Group (other than the transactions contemplated by this Agreement), whether by merger,
purchase of assets, tender offer, exchange offer or otherwise. Sellers shall notify Purchaser
immediately if any third party makes any offer with respect to the foregoing.

     5.4 Additional Arrangements. Subject to the terms and conditions herein provided, each of the
Parties shall take, or cause to be taken, all actions and shall do, or cause to be done, all things
necessary, appropriate or desirable under any applicable laws and regulations or under applicable
governing agreements to consummate and make effective the transactions contemplated by this
Agreement, including using reasonable efforts to obtain all necessary waivers, consents and
approvals and effecting all necessary registrations and filings. Each of the Parties shall take,
or cause to be taken (including actions which Sellers shall cause the Midwest Group to take), and
in the case of Purchaser, shall use reasonable efforts to take or cause to be taken, all actions or
shall do, or cause to be done, or in the case of Purchaser, shall use reasonable efforts to do or
cause to be done all things necessary, appropriate or desirable to cause the covenants and
conditions applicable to the Closing of the transactions contemplated hereby to be performed or
satisfied as soon as practicable. In addition, if any Governmental Authority shall have issued any
order, decree, ruling or injunction, or taken any other action that would have the effect of
restraining, enjoining or otherwise prohibiting or preventing the consummation of the transactions
contemplated hereby, each of the Parties shall use reasonable efforts to have such order, decree,
ruling or injunction or other action declared ineffective as soon as practicable.

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     5.5 Payment of Expenses. Except as otherwise provided herein, each of the Parties shall bear
its own expenses in connection with the transactions contemplated herein, including all fees and
expenses of agents, representatives, counsel and accountants engaged by it.

     5.6 Public Announcements. Sellers and Purchaser shall consult with each other before issuing
any press release or otherwise making any public statement with respect to the transactions
contemplated by this Agreement and shall not issue any press release or make any such public
statement prior to obtaining the approval of the other Party; provided, however, that such approval
shall not be required where such release or announcement is required by applicable law, securities
regulations or stock exchange rules; and provided further, that either Sellers or Purchaser may
respond to inquiries by the press or others regarding the transactions contemplated by this
Agreement, so long as such responses are consistent with such Party’s previously issued press
releases.

     5.7 Tax Returns. Sellers shall prepare and provide to Purchaser a draft stub period Tax
Return which shall assume that the pre-closing transactions, if any, contemplated by Section 5.8
had not occurred. In the event that the transactions contemplated by Section 5.8 have occurred
prior to Closing, Purchaser shall prepare a Tax Return taking such transactions into account. Prior
to filing any Tax Return required to be filed by any of Midwest or the Subsidiaries for any period
ending on or before the Closing Date, Sellers shall be entitled to review such Tax Return no later
than 30 days prior to the date such Tax Return is due to be filed and Purchaser shall incorporate
any resulting requests to amend such Tax Return received by it no later than 10 days prior to such
due date as Purchaser considers reasonable.

     5.8 Pre-Closing Transactions. Prior to the Closing Date, Purchaser may request that any of
Midwest or the Subsidiaries establish one or more subsidiary corporations and/or one or more
limited partnerships between members of the Midwest Group and transfer all or any portion of the
businesses of the Midwest Group related to the Business or otherwise to such subsidiary
corporations or partnerships. Sellers agree, at Purchaser’s expense, to comply with such request
and cause the members of the Midwest Group to undertake such transactions, including the execution
of the necessary agreements and tax elections, provided that: (i) Purchaser bears all the costs of
completing
such transactions; (ii) Sellers and their counsel, acting reasonably, are of the view that
such transactions do not violate any statutory, contractual or equitable obligation of any member
of the Midwest Group; (iii) Purchaser agrees to fully indemnify Sellers for all losses (including
for certainty, any Taxes) in respect of such transactions, including the unwinding of such
transactions; (iv) Purchaser agrees to forego the indemnity of Sellers for all losses (including
for certainty any Taxes) in respect of such transactions; (v) Purchaser and its counsel prepare
all agreements, conveyances, resolutions and similar documents necessary to undertake such
transactions; and (vi) Purchaser prepares all necessary tax elections required to complete such
transactions on a tax-deferred basis.

     5.9 Further Assurances. From time to time after the Closing, each of the Parties will execute
and deliver such further instruments of conveyance and transfer and take such other action as the
other Party may reasonably request in order more effectively to convey and transfer the Shares and
to assist in completing the transactions contemplated by this Agreement.

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     5.10 Taxes. Except for any Taxes of any nature resulting from the transactions described or
contemplated under Section 5.8: (i) Sellers shall bear and pay any applicable sales, use and/or
other transfer taxes payable in connection with this Agreement and the transactions contemplated
hereby; (ii) Sellers shall be responsible for remitting all such taxes to the appropriate
Governmental Authority; (iii) Sellers shall be responsible for all Taxes resulting from any
inter-company financial transactions completed prior to the Closing for the purpose of eliminating
inter-company balances or redeeming any preferred shares; and (iv) Sellers shall be responsible for
any income taxes resulting from the transactions contemplated in this Agreement, except for any
Taxes of any nature resulting from the transactions described or contemplated under Section 5.8.

     5.11 Confidentiality.

     (a) Prior to the Closing, Sellers agree that they will not use or disclose to any third
party, excluding Seller Representatives, any confidential information with respect to
Purchaser. Sellers acknowledge and agree that non-public information concerning the
progress of the transaction contemplated by this Agreement is confidential information. For
a period of two years after the Effective Date, Sellers shall hold, and shall cause their
Affiliates and the Seller Representatives to hold, confidential all information pertaining
to the business or assets of the Midwest Group which is non-public, confidential or
proprietary in nature, except to the extent (a) such information is of record with any
public agency; (b) such information is or becomes public knowledge through no action of
AMEC, AMEC Americas, their Affiliates or any of the Seller Representatives; or (c) AMEC,
AMEC Americas, any of their Affiliates or any of the Seller Representatives is required by
law, securities regulations or stock exchange rules to disclose.

     (b) Prior to the Closing, Purchaser agrees that it will not use or disclose to any
third party, excluding Purchaser Representatives, any confidential information with respect
to Sellers or the Midwest Group. Purchaser acknowledges and agrees that non-public
information concerning the progress of the transaction contemplated by this Agreement is
confidential information. For a period of two years after the Effective Date, Purchaser
shall
hold, and shall cause its Affiliates and the Purchaser Representatives to hold, confidential
all information pertaining to the business or assets of Sellers (other than information
relating to the Midwest Group) which is non-public, confidential or proprietary in nature,
except to the extent (a) such information is of record with any public agency; (b) such
information is or becomes public knowledge through no action of Purchaser, its Affiliates or
any of the Purchaser Representatives; or (c) Purchaser, any of its Affiliates or any of the
Purchaser Representatives is required by law, securities regulations or stock exchange rules
to disclose; provided, however, that upon the Closing, Purchaser shall not owe Sellers a
duty to keep confidential information of the Midwest Group to the extent that such
information does not include information confidential or proprietary to Sellers.

     5.12 Noncompetition. Each Seller agrees that, for a period of five years from the date of the
Closing, it will not, directly or indirectly, in any way (a) compete with Purchaser or the Midwest
Group in Western Canada or the Northern Territories by engaging in the Business (by soliciting

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Purchaser’s customers or otherwise) or operating, holding an equity or debt interest in, or
extending financial assistance to any person or entity (other than Purchaser or the Midwest Group)
which is then engaged in the Business as it is conducted by the Midwest Group on the date of the
Closing or during the three-year period prior to the Closing Date; or (b) solicit any employee of
the Midwest Group for employment by AMEC or AMEC Americas or any of their Affiliates or any
undertaking with which AMEC or AMEC Americas or any of their Affiliates is associated. For
purposes of this Section 5.12, the term Purchaser shall also include Affiliates of Purchaser.
Nothing herein shall prevent AMEC, AMEC Americas or their Affiliates from owning up to two percent
of the outstanding share capital of any publicly traded entity, regardless of the business in which
such entity might be engaged.

     5.13 Employees. All employees of the Midwest Group as of the Closing Date will remain
employed by the Midwest Group, and shall maintain their seniority and salary levels; provided,
however, that the continued employment by such employees beyond the Closing Date shall be subject
to normal management prerogatives. From and after the Closing Date, neither AMEC nor AMEC Americas
shall be responsible for any employment-related obligations for the Midwest Group employees,
including, for the avoidance of doubt, any severance obligations.

     5.14 Brokers’ Fees. Each of AMEC and AMEC Americas, on the one hand, and Purchaser, on the
other, represents and warrants to the other that, it has not incurred any liability for brokerage
fees, finder’s fees, agent’s commissions, or other similar forms of compensation in connection with
or in any way related to the transactions contemplated by this Agreement, except that Crown Capital
has acted as an advisor to Purchaser in connection with the transaction contemplated under this
Agreement, and Purchaser acknowledges its sole responsibility for payment of any associated fees
payable to Crown Capital. Each of Purchaser, on the one hand, and AMEC and AMEC Americas, on the
other, agrees to indemnify, defend and hold the other and its related persons harmless from any
claim or demand for any commission, fee or other compensation by any broker, finder, agent or
similar intermediary claiming to have been employed by or on behalf of the indemnifying party, and
to bear the cost of attorneys’ fees and expenses incurred in defending against any such claim.

     5.15 Mutual Cooperation. Each Party shall cooperate with the other Parties, which cooperation
shall include the furnishing of testimony and other evidence, permitting access to employees and
providing information regarding the whereabouts of former employees, as reasonably requested by the
other Party in connection with the prosecution or defense of any claims or other matters relating
to the transactions contemplated herein.

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     5.16 Preservation of Files and Records. For a period of five years after the date of the
Closing: (a) Purchaser shall preserve, or cause the Midwest Group to preserve, all files and
records relating to the Midwest Group that are less than five years old, shall allow Sellers or
their designee reasonable access to such files and records and the right to make copies and
extracts therefrom at any time during normal business hours and shall not dispose of any thereof
without first offering them to Seller; and (b) Sellers shall preserve all files and records
relating to the Midwest Group that are less than five years old and that are retained by AMEC and
AMEC Americas, shall allow Purchaser or its designee reasonable access to such files and records
relating to the Midwest Group as may be in the possession of AMEC or AMEC Americas and the right to
make copies and extracts therefrom at any time during normal business hours and shall not dispose
of any thereof without first offering them to Purchaser; provided, however, that, after the
expiration of the five years following the Closing Date, each Seller shall, and Purchaser shall or
shall cause the Midwest Group to, as applicable, preserve all files and records which relate to or
are necessary or useful for the prosecution, defense or investigation of any matter (whether or not
such matter is a Claim subject to any Party’s obligation to indemnify any other Party) for the
earlier of (i) the expiration of the statute of limitations applicable to such matter and (ii) the
period of time reasonably requested by the prosecuting, defending or investigating Party. A Party
shall not have obligations to preserve files and records for the extended period provided for in
the foregoing proviso unless any other Party has notified such Party of its need or potential need
for such records prior to the expiration of the five years following the Closing Date.

     5.17 Compliance with Law and Rules. The Parties acknowledge that Purchaser, Purchaser’s
Affiliates and all of their employees, officers, directors and representatives are subject to the
United States Foreign Corrupt Practices Act of 1977 (the “FCPA”), and that, accordingly, all of
Sellers’ activities under or in connection with this Agreement are subject to the requirements of
the FCPA. Each Seller warrants and agrees that, in connection with the transaction contemplated by
this Agreement, neither it nor anyone acting on its behalf has violated the FCPA by paying,
offering or giving anything of value to any government official, political party or political
candidate, any public international organization official or any other person with the knowledge
that the payment, promise or gift, in whole or in part, would be passed on to any of the foregoing
in order to influence an official act or decision that would assist AMEC, AMEC Americas, Purchaser
or the Midwest Group in securing an improper advantage or in obtaining or retaining business or in
directing business to any other Person. Each Seller certifies that, in connection with the
transaction contemplated by this Agreement: (a) its conduct is consistent with the FCPA and (b) it
has not engaged in any conduct contrary to the FCPA.

     5.18 Privacy Matters.

     (a) Disclosed Personal Information. The Parties acknowledge that they are responsible
for compliance at all times with Applicable Privacy Laws which govern the collection, use
and disclosure of Personal Information acquired by or disclosed to any Party pursuant to or
in connection with this Agreement (the “Disclosed Personal Information”).

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     (b) No Unrelated Use. No Party shall use the Disclosed Personal Information for any
purposes other than those related to the performance of this Agreement and the completion of
the transactions contemplated hereby.

     (c) Necessary Disclosure. Each Party acknowledges and confirms that the disclosure of
Personal Information is necessary for the purposes of determining if the Parties shall
proceed with the transactions contemplated hereby, and that the disclosure of Personal
Information relates solely to the carrying on of the business and the completion of the
transactions contemplated hereby.

     (d) Applicable Measures. Each Party acknowledges and confirms that it has and shall
continue to employ appropriate technology and procedures in accordance with applicable law
to prevent accidental loss or corruption of the Disclosed Personal Information, unauthorized
input or access to the Disclosed Personal Information, or unauthorized or unlawful
collection, storage, disclosure, recording, copying, alteration, removal, deletion, use or
other processing of such Disclosed Personal Information.

     (e) Duty to Keep Confidential. Each Party shall at all times keep strictly
confidential all Disclosed Personal Information provided to it, and shall instruct those
employees or advisors responsible for processing such Disclosed Personal Information to
protect the confidentiality of such information in a manner consistent with the Parties’
obligations hereunder. Each Party shall ensure that access to the Disclosed Personal
Information shall be restricted to those employees or advisors of the respective Party who
have a bona fide need to access to such information in order to complete the transactions
contemplated hereby.

     (f) Duty to notify. Each Party shall promptly notify the other Parties of all
inquiries, complaints, requests for access, and claims of which the Party is made aware in
connection with the Disclosed Personal Information. The Parties shall fully co-operate with
one another, with the persons to whom the Personal Information relates, and any Authorized
Authority charged with enforcement of Applicable Privacy Laws, in responding to such
inquiries, complaints, requests for access, and claims.

     (g) Duty to Return or Destroy. Upon the expiry or termination of this Agreement, or
otherwise upon the reasonable request of any Party hereto, the other Parties shall forthwith
cease all use of the Personal Information acquired by such other Parties in connection with
this Agreement and will return to the requesting Party or, at the requesting Party’s
request, destroy in a secure manner, the Disclosed Personal Information (and any copies).

     5.19 Environmental Inspection.

     (a) During the period from the Effective Date to the Closing, Sellers shall permit
Purchaser to conduct environmental inspections of the operations and assets of the Midwest
Group, including all properties owned or leased by the Midwest Group.

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     (b) Purchaser may retain Golder Associates to conduct, at Purchaser’s sole expense, a
Phase I Environmental Site Assessment (“Golder Phase I”) and a Phase II Environmental Site
Assessment (the “Golder Phase II”) to perform the scope of work identified in the Golder
Phase I and the resulting Golder Associates Work Plan as well as any follow-up delineation
investigation, inspection and/or audit of the above ground storage tanks and underground sump
holding/collection tank. Purchaser shall provide Sellers with a copy of the Golder Phase I
and II reports once obtained.

     5.20 Environmental Remediation; Further Inspection. Sellers shall perform, at Sellers’ sole
expense, the following remediation activities at the Ellis Drive Property:

     (a) Removal of the two fuel and/or diesel underground storage tanks and
surrounding soil under the environmental supervision and direction of Golder
Associates or subcontractors recommended by Golder Associates, and following removal
of the underground storage tanks, any remediation required as a result of inspection
by Golder Associates, at Sellers’ expense, of such removal site;

     (b) Remediation and removal of the surficial staining in the parking areas,
maintenance areas and other stained areas in the equipment storage yard as
identified in the Golder Phase II; and

     (c) Decommissioning of the monitoring wells located on the Ellis Drive Property
in consultation and with oversight by Golder Associates.

Sellers shall make reasonable efforts to perform the items set forth above prior to Closing.
Sellers shall also perform any other Phase III remediation activities which are recommended as a
result of the Golder Phase II. Sellers may contest the findings of the Golder Phase II report by
giving notice to Purchaser within 14 days after receipt of the Golder Phase II report. Should
notice be properly given, the Golder Phase II report may be submitted, at Sellers’ sole expense, to
a qualified, independent environmental consultant, approved by Purchaser, who shall provide advice
to Purchaser, who will decide, acting reasonably, whether the recommended remediation from the
Golder Phase II report is justified.

     5.21 Inter-company Indebtedness. Prior to the Closing, Sellers shall cause all inter-company
accounts, indebtedness, guarantees and indemnities between the Midwest Group and AMEC or AMEC
Americas, or any Affiliate of Sellers, to be reduced to zero. Additionally, prior to the Closing,
Sellers shall present to Purchaser trial balances of Midwest, MGCL and MPRI evidencing
that the aforementioned debt obligations have been reduced to zero, along with an accurate
description on how such accounts were reduced to zero.

     5.22 Competition Act. Each Party shall cooperate with the other Parties regarding the filing
of the pre-merger notification required by the Competition Act (Canada). Each of Sellers on the
one hand, and Purchaser on the other hand, shall bear one-half the cost of the $50,000 pre-merger
notification filing fee payable under the Competition Act (Canada).

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     5.23 Prohibited Acquisitions.

     (a) No Seller or its Affiliates (excluding any Affiliate acquiring the shares of AMEC
plc, a corporation organized under the laws of the United Kingdom, through merger) has
acquired or will acquire any property that is (i) Prohibited Property, (ii) shares of
Willbros Group, Inc., or (iii) debt issued by Willbros Group, Inc., for a period of at least
four years after the date of this Agreement.

     (b) To the best of Sellers’ knowledge as of the date of this Agreement, no shareholder
owning an interest of 10 percent or greater in AMEC plc has acquired or intends to acquire
property that is Prohibited Property.

ARTICLE VI

CONDITIONS

     6.1 Conditions to Each Party’s Obligation to Proceed with Closing. The respective obligations
of each Party to proceed with Closing shall be subject to the satisfaction, at or prior to the
Closing Date, of the following conditions:

     (a) Approvals. All filings required to be made prior to the Closing with, and all
consents, approvals, permits and authorizations required to be obtained prior to the Closing
from, any Governmental Authority in connection with the execution and delivery of this
Agreement and the consummation of the transactions contemplated hereby by the Parties shall
have been made or obtained (as the case may be), except where the failure to obtain such
consents, approvals, permits and authorizations would not be reasonably likely to result in
a Material Adverse Effect on the Midwest Group or on Purchaser, as the case may be, or to
materially adversely affect the consummation of the transaction contemplated by this
Agreement. Prior to the Closing, Competition Act Approval shall have been obtained.

     (b) No Injunctions or Restraints. No temporary restraining order, preliminary or
permanent injunction or other order issued by any court of competent jurisdiction or other
legal restraint or prohibition preventing the consummation of the transaction contemplated
by this Agreement shall be in effect; provided, however, that, prior to invoking this
condition, each Party shall use all reasonable efforts to have any such decree, ruling,
injunction or order vacated, and, if necessary, the Closing shall be delayed for up to 30
days while such efforts are taking place.

     6.2 Conditions to Obligations of Purchaser. The obligations of Purchaser to proceed with
Closing are subject to the satisfaction of the following conditions, any or all of which may be
waived in whole or in part by Purchaser:

     (a) Representations and Warranties. The representations and warranties of AMEC and
AMEC Americas set forth in Section 4.1 shall be true and correct in all material respects as
of the Closing Date as though made on and as of that time (except that any such
representations and warranties which expressly relate only to an earlier date shall be true
and

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correct on the Closing Date as of such earlier date), and Purchaser shall have received
a certificate signed by a Responsible Officer of AMEC and AMEC Americas to such effect.

     (b) Performance of Covenants and Agreements by Seller. AMEC and AMEC Americas shall
have performed in all material respects all covenants and agreements required to be
performed by it under this Agreement at or prior to the Closing Date, and Purchaser shall
have received a certificate signed by a Responsible Officer of AMEC and AMEC Americas to
such effect.

     6.3 Conditions to Obligations of Seller. The obligations of Sellers to proceed with the
Closing is subject to the satisfaction of the following conditions, any or all of which may be
waived in whole or in part by Sellers:

     (a) Representations and Warranties. The representations and warranties of Purchaser
set forth in Section 4.2 shall be true and correct in all material respects as of the
Closing Date as though made on and as of that time (except that any such representations and
warranties which expressly relate only to an earlier date shall be true and correct on the
Closing Date as of such earlier date), and Sellers shall have received a certificate signed
by a Responsible Officer of Purchaser to such effect.

     (b) Performance of Covenants and Agreements by Purchaser. Purchaser shall have
performed in all material respects all covenants and agreements required to be performed by
it under this Agreement at or prior to the Closing Date, and Sellers shall have received a
certificate signed by a Responsible Officer of Purchaser to such effect.

ARTICLE VII

TERMINATION

     7.1 Termination Rights. This Agreement may be terminated at any time prior to the Closing:

     (a) By mutual written agreement of Purchaser and Sellers;

     (b) By either Sellers or Purchaser if (i) except as provided in clause (ii) below, the
Closing has not occurred by July 5, 2007 (provided, however, that the right to terminate
this Agreement pursuant to this clause (i) shall not be available to any Party whose breach
of any
representation or warranty or failure to perform any covenant or agreement under this
Agreement (which, in the case of Sellers, shall include breach or failure by the Midwest
Group) has been the cause of or resulted in the failure of Closing to occur on or before
such date); (ii) the Closing has not occurred by July 5, 2007, solely because the
Competition Act Approval has not yet been obtained; provided, however, that if the
Commissioner of Competition, Industry Canada Competition Bureau (the “Bureau”) has indicated
that it requires or requests additional information upon which to evaluate the transaction,
each of the Parties, during the 30 days following July 5, 2007, shall provide such
information or otherwise reasonably cooperate with the Bureau to cause the Bureau to reach
its

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determination and this Agreement shall not be subject to termination until the
expiration of such 30 days; or (iii) any Governmental Authority shall have issued an order,
decree or ruling or taken any other action permanently restraining, enjoining or otherwise
prohibiting Closing and such order, decree, ruling or other action shall have become final
and nonappealable (provided, however, that the right to terminate this Agreement pursuant to
this clause (iii) shall not be available to any Party until such Party has used all
reasonable efforts to remove such injunction, order or decree and such efforts may continue
up to 30 days after the Effective Date);

     (c) By Purchaser if either Seller has failed to comply in any material respect with any
of such Seller’s covenants or agreements contained in this Agreement and such failure has
not been, or cannot be, cured within 10 business days after notice and demand for cure
thereof;

     (d) By Sellers (i) if Purchaser has failed to comply in any material respect with any
of Purchaser’s covenants or agreements contained in this Agreement, and such breach or
failure has not been, or cannot be, cured within 10 business days after notice and a demand
for cure thereof; or

     (e) By either Sellers or Purchaser in the event that the Closing has not occurred prior
to August 6, 2007.

     7.2 Effect of Termination. If this Agreement is terminated by either Sellers or Purchaser
pursuant to the provisions of Section 7.1, this Agreement shall forthwith become void without
liability to any Party to this Agreement except for, and there shall be no further obligation on
the part of any Party or its respective Affiliates except pursuant to, the provisions of Sections
2.2(b) (with respect to the Deposit), 5.2(b) (but only to the extent of the confidentiality and
indemnification provisions contained therein), 5.5 (regarding payment of expenses), 5.8 (with
respect to the indemnification provisions contained therein), 5.11(a) and 5.11(b) (with respect to
the confidentiality provisions contained therein) and 5.15 (with respect to the indemnification
provisions contained therein), which shall continue pursuant to their terms; provided, however,
that a termination of this Agreement shall not relieve any Party from any liability for damages
incurred as a result of a breach by such Party of its covenants, agreements or other obligations
hereunder occurring prior to such termination; and provided further, in no event will any Party be
liable to any other Party for incidental, consequential, exemplary, punitive or special damages of
any kind or for lost or imputed profits. If this Agreement is
terminated by Purchaser, Purchaser shall reimburse Sellers for the reasonable costs incurred by
Sellers related to the unwinding of the pre-closing transactions described in Section 5.8. Upon
such termination, Sellers shall be free to immediately enjoy all rights of ownership and to sell,
transfer, encumber or otherwise dispose of the Shares to any other Person without any restriction
under this Agreement.

ARTICLE VIII

INDEMNIFICATION AND THIRD PARTY CLAIMS

     8.1 Indemnification. Subject to the limitations set forth in Section 8.3, each of AMEC

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and
AMEC Americas (jointly and severally) and Purchaser (each an “Indemnifying Party”) hereby agrees to
indemnify, defend and hold harmless the other Party, and its directors, officers, employees and
controlled and controlling persons (hereinafter, collectively, “related persons”), from and against
all Claims (other than Claims described in Section 8.3(b), 8.3(c) or 8.3(d)) asserted against,
resulting to, imposed upon or incurred by such Party or such Party’s related persons (an
“Indemnified Person”), to the extent resulting from: (a) the inaccuracy or breach of any
representation or warranty of the Indemnifying Party contained in or made pursuant to this
Agreement, or (b) the breach of any covenant of the Indemnifying Party contained in or made
pursuant to this Agreement. AMEC and AMEC Americas (jointly and severally) hereby agree to
indemnify, defend and hold harmless Purchaser and its related persons from and against all Claims
asserted against, resulting to, imposed upon or incurred by Purchaser or Purchaser’s related
persons to the extent resulting from any Taxes payable by Midwest or any of the Subsidiaries, or in
each such case, their successors and assigns, under the Tax Act or other applicable law for
taxation years ending on or before the Closing Date (or the portion of such Taxes for any taxation
year or period ending on or after the Closing Date that is attributable to the portion of such year
ending on the Closing Date), in all such cases to the extent those Taxes are not reflected as a
Current Liability or do not arise directly as a result of those transactions described in Section
5.8. As used in this Article VIII, the term “Claim” shall mean: (x) all debts, liabilities and
obligations; (y) all losses, damages, costs and expenses, including pre- and post-judgment
interest, Taxes, penalties, court costs and attorneys’ fees and expenses; and (z) all demands,
claims, actions, costs of investigation, causes of action, proceedings, arbitrations, judgments,
settlements and assessments, whether or not ultimately determined to be valid.

     8.2 Defense of Third Party Claims.

     (a) In the event any Claim is asserted against any Indemnified Person by a third party,
the Indemnified Person shall with reasonable promptness notify the Indemnifying Party of
such Claim. If the Indemnified Person does not so notify the Indemnifying Party within 15
days after becoming aware of such Claim, then the Indemnifying Party shall, if such delay
materially prejudices the Indemnifying Party with respect to the defense of such Claim, be
relieved of liability hereunder in respect of such Claim to the extent of the damage caused
by such delay. In any such proceeding, following receipt of notice properly given, the
Indemnifying Party shall be entitled, at its sole discretion, to assume the entire defense
of such Claim (with counsel selected by it which is reasonably satisfactory to the
Indemnified Person or Persons), and the Indemnifying Party shall bear the entire cost of
defending such Claim.
The Indemnifying Party shall not have the right to settle any such Claim without the written
consent of the Indemnified Person or Persons, unless the settlement of such Claim involves
only the payment of monetary damages and no future affect whatsoever on any Indemnified
Person. In the event of the assumption of the defense by the Indemnifying Party, the
Indemnifying Party shall not be liable for any further legal or other expenses subsequently
incurred by the Indemnified Persons in connection with such defense unless otherwise agreed
to in writing by the Indemnifying Party or as herein provided; provided, however, the
Indemnified Persons shall have the right to participate in such defense, at their own cost,
and the obligation to cooperate therewith.

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Share Purchase Agreement (Final)

 

     (b) Sellers shall assume responsibility for the existing Claims relating to the Centra
Gas Project; provided, that Purchaser shall cause the Midwest Group and its employees to
cooperate, to the extent reasonable, at Sellers’ expense, in Sellers’ defense of such
Claims. Such matters shall not be subject to any of the limitations set forth in Section
8.3(f) but shall be subject to the limitations set forth in Section 8.3(e).

     (c) Sellers shall also assume responsibility for the litigation matters set forth in
Section 4.1(q) of the Disclosure Schedule; provided, that Purchaser shall cause the Midwest
Group and its employees to cooperate, to the extent reasonable, at Sellers’ expense, in
Sellers’ defense of such Claims. Such matters, other than those relating to the Centra Gas
Project, shall be subject to the limitations set forth in Section 8.3(f).

     8.3 Limit on Indemnity Obligations.

     (a) No Indemnified Person shall be entitled to seek indemnification from any
Indemnifying Party pursuant to this Article VIII with respect to any Claim (other than a
Claim under Section 8.2(b) or 8.2(c)) unless such Indemnified Person notifies such
Indemnifying Party of such Claim within (i) two years following the Closing Date, with
respect to Claims other than those arising from a breach of Sellers’ representations and
warranties contained in Section 4.1(s) or Section 4.1(ee) (related to environmental matters
or Taxes); or (ii) 30 days after the expiration of the applicable statute of limitations (as
the same may have been extended or waived) with respect to Claims arising from a breach of
Sellers’ representations and warranties contained in Section 4.1(ee) (related to Taxes); or
(iii) four years following the Closing Date with respect to Claims arising from a breach of
Sellers’ representations and warranties contained in Section 4.1(s) (related to
environmental matters).

     (b) For any Claim against Midwest or any of the Subsidiaries that is in the nature of a
warranty claim, a claim for re-work, a complaint concerning workmanship, or a claim for
charge-back, liability and/or indemnification asserted under the terms of any contract or
subcontract, and which arises from any project for which a majority of the work (measured by
revenue) was performed on or prior to the Closing Date:

     (i) For which insurance coverage, which has been accepted by the insurance
carrier of Sellers and their affiliates, responds to the Claim, Sellers shall accept
financial
responsibility for all amounts covered by insurance, and financial responsibility for
the deductible amount will be divided between the Parties, with 25 percent retained
by the Midwest Group and 75 percent assumed by Sellers;

     (ii) For which no insurance coverage responds to the Claim, financial
responsibility shall be divided between the Parties with 25 percent retained by the
Midwest Group and 75 percent assumed by Sellers; and

     (iii) The cumulative total of Claims, including insurance deductible amounts,
for which the Midwest Group shall be required to share 25 percent of responsibility
shall be capped at $2,000,000; therefore, the maximum liability of the Midwest Group

Share Purchase Agreement (Final)

-43-

 

with respect to these Claims shall be $500,000, and Sellers shall be responsible for
100 percent of all Claims in excess of a cumulative total of $2,000,000; provided,
that Sellers’ liability for these Claims shall be limited as set forth in Section
8.3(e) and 8.3(f), although any amounts not indemnified pursuant to Section 8.3(f)
shall be applied to the calculation of the $500,000 maximum liability of Purchaser.
Purchaser shall cause the Midwest Group and its employees to cooperate, to the extent
reasonable, at Sellers’ expense, in Sellers’ defense of Claims for which Sellers are
liable.

     (c) The Midwest Group shall assume liability for any Claim arising from projects for
which a majority of the work (measured by revenue) was performed after the Closing Date.

     (d) Sellers shall assume no liability for any Claim arising from work performed after
the Closing Date.

     (e) The obligations of Sellers under this Article VIII shall be limited to 50 percent
of the aggregate Purchase Price.

     (f) Notwithstanding anything to the contrary contained in this Agreement, Sellers shall
not be obligated to indemnify Purchaser pursuant to Section 8.1 or 8.2, or to pay any
amounts under Section 8.3(b) (except with respect to any Claims arising from Sellers’
representations and warranties in Section 4.1(ee), Claims described in Section 8.2(b) and
Claims arising from any breach of any covenant of Sellers, including the covenants set forth
in Sections 5.19 and 5.20): (i) for any Claim that is not a Material Claim and (ii) unless
and until the aggregate amount of all Claims other than Material Claims exceeds one hundred
thousand dollars ($100,000) (the “Threshold”) and then only to the extent that the aggregate
amount of the Claims other than Material Claims exceeds the Threshold.

     8.4 Bonding. Purchaser shall indemnify and hold Sellers harmless from and against any and all
claims, losses, costs, liabilities, damages, demands and expenses, judgments, interest, fines,
penalties, amounts paid in settlement, assessments, payments and/or other obligations of Sellers
under or in respect of any performance, payment or other bond or performance guarantee outstanding
as of the Closing Date with respect to projects that are subject to completion by the Midwest Group
after the Closing Date, if and to the extent arising as a result of the non-performance, faulty
performance or
non-payment of the Midwest Group post-Closing, or arising out of any other reason for which a
claim is made or may be made under such bonds or performance guarantees. This indemnity by
Purchaser, without limiting the foregoing, shall extend to and include all costs and expenses to
defend any such claims on behalf of Sellers and its sureties, whether or not any such claim is
valid.

     8.5 Other Indemnification Rights. The foregoing indemnification provisions are in addition
to, and not in derogation of, any statutory, equitable, or common law remedy that an Indemnified
Person may have for breach of any representation, warranty, covenant or agreement;

Share Purchase Agreement (Final)

-44-

 

provided, that,
in the absence of fraud, the limitations on rights of indemnification set forth in Section 8.3
shall apply to such remedies.

     8.6 Survival. The representations, warranties, covenants and agreements made in this
Agreement or in any certificate or instrument delivered in connection herewith shall be in full
force and effect notwithstanding any investigation made by or disclosure made to either Party,
whether before or after the date hereof, shall survive the execution and delivery of this
Agreement, and shall survive the Closing and continue to be applicable and binding thereafter for
the period set forth in Section 8.3(a), at which time the same shall terminate and be extinguished.
The representations, warranties, liabilities and indemnities created in this Agreement shall be
deemed to apply to all assignments, conveyances, transfers and other documents conveying the Shares
from AMEC and AMEC Americas to Purchaser. There shall not be any merger of any of such
representations, warranties, liabilities or indemnities in such assignments, transfers or other
documents.

ARTICLE IX

MISCELLANEOUS

     9.1 Governing Law. This Agreement shall be governed by and construed in accordance with the
substantive law of the Province of Alberta and the federal laws of Canada without giving effect to
the principles of conflicts of law thereof.

     9.2 Counterparts. This Agreement may be executed in multiple counterparts, each of which
shall be an original, but all of which together shall constitute one and the same agreement.

     9.3 Assignment; Binding Effect. Neither this Agreement nor any of the rights, interests or
obligations hereunder shall be assigned by either of the Parties (whether by operation of law or
otherwise) without the prior written consent of Sellers if such assignment is sought by Purchaser,
or Purchaser, if such assignment is sought by Sellers, except that Purchaser may assign its rights
and obligations hereunder to any of its Affiliates; provided, however, that any such assignment
shall not relieve Purchaser from any of its obligations hereunder. Subject to the preceding
sentence, this Agreement will be binding upon, inure to the benefit of and be enforceable by the
Parties and their respective successors and assigns.

     9.4 Entire Agreement. This Agreement (including the Exhibits and Schedules hereto)
constitutes the entire agreement between the Parties, and supersedes any prior understandings,
agreements, arrangements and representations between the Parties, written or oral, to the
extent they related in any way to the subject matter hereof.

     9.5 Notices. All notices, requests, demands, claims and other communications required or
permitted to be given hereunder shall be in writing and shall be given by (a) personal delivery
(effective upon delivery), (b) facsimile (effective on the next business day after transmission),
(c) recognized overnight delivery service (effective on the next business day after delivery to the
service), or (d) registered or certified mail, return receipt requested and postage prepaid
(effective on the third business day after being so mailed), in each case addressed to the intended
recipient as set forth below:

Share Purchase Agreement (Final)

-45-

 

If to Purchaser:

Willbros Acquisition Canada Limited

Suite 2600

Three Bentall Centre

595 Burrard Street

Vancouver V7X 1L3

British Columbia

Canada

with copies to:

c/o Willbros MSI Canada Inc.

2415 – 101 Street SW

Edmonton

Alberta

Canada T6X 1A1

Facsimile: +1-780-577-2743

Attention: Company Secretary

and

c/o Willbros USA, Inc.

4400 Post Oak Parkway, Suite 1000

Houston, Texas 77027

U.S.A.

Facsimile: +1-713-403-8136

Attention: General Counsel

and

Conner & Winters, LLP

4000 One Williams Center

Tulsa, Oklahoma 74172-0148

U.S.A.

Facsimile: +1-918-586-8625

Attention: Robert A. Curry

If to Seller:

Share Purchase Agreement (Final)

-46-

 

AMEC Inc.

2020 Winston Park Drive

Suite 700

Oakville, Ontario

Canada L6H 6X7

Facsimile: 905-403-5034

Attention: Tarun Bafna

With copies to:

AMEC Inc.

2020 Winston Park Drive

Suite 700

Oakville, Ontario

Canada L6H 6X7

Facsimile: 905-403-5034

Attention: Charles Caza, General Counsel

and

Borden Ladner Gervais LLP

Scotia Plaza

40 King Street West

Toronto, Ontario

Canada M5H 3Y4

Facsimile: 416-361-7082

Attention: Paul G. Findlay

and

Thompson & Knight LLP

333 Clay Street, Suite 3300

Houston, Texas 77002

Facsimile: 713.654.1871

Attention: Vivienne Schiffer

Either Party may change its address for receiving notices by giving written notice of such change
to the other Party in accordance with this Section 9.5.

     9.6 Amendment. This Agreement may be amended by the Parties at any time only by a written
instrument signed on behalf of each of the Parties.

     9.7 Severability. Any term or provision of this Agreement that is invalid or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such invalidity or
unenforceability without rendering invalid or unenforceable the remaining terms and provisions of
this Agreement or affecting the validity or enforceability of any of the terms or

Share Purchase Agreement (Final)

-47-

 

provisions of
this Agreement in any other jurisdiction. If any provision of this Agreement is so broad as to be
unenforceable, such provision shall be interpreted to be only so broad as is enforceable. If any
of the provisions of this Agreement are determined to be invalid, illegal or unenforceable in any
respect, the validity, legality and enforceability of the other provisions shall not in any way be
effected or impaired thereby.

     9.8 Waivers. The Parties may, to the extent legally allowed: (a) extend the time for the
performance of any of the obligations or other acts of the other Party, (b) waive any inaccuracies
in the representations and warranties contained herein or in any document delivered pursuant
hereto, and (c) waive performance of any of the covenants or agreements, or satisfaction of any of
the conditions, contained herein. Any agreement on the part of a Party to any such extension or
waiver shall be valid only if set forth in a written instrument signed on behalf of such Party.
Except as provided in this Agreement, no action taken pursuant to this Agreement, including any
investigation by or on behalf of either Party, shall be deemed to constitute a waiver by the Party
taking such action of compliance with any representations, warranties, covenants or agreements
contained in this
Agreement. The waiver by either Party of a breach of any provision hereof shall not operate
or be construed as a waiver of any prior or subsequent breach of the same or any other provisions
hereof.

     9.9 Enforcement of Agreement. The Parties agree that irreparable damage could occur in the
event that any provision of this Agreement was not performed in accordance with the terms hereof or
was otherwise breached. Accordingly, the Parties hereby agree that each Party shall be entitled to
an injunction to prevent a breach of this Agreement and shall be entitled to specific performance
of the terms and provisions hereof in addition to any other remedy at law or in equity.

[Signatures on following page.]

Share Purchase Agreement (Final)

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     IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by their duly
authorized representatives as of the date first above written.

	 	 	 	 	 	 	 	 	 	 	 
	“Purchaser”	 	 	 	“Sellers”	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	Willbros Acquisition Canada Limited	 	 	 	AMEC Inc.	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	By:

	 	/s/ Gay Stanley Mayeux
	 	 	 	By:
	 	/s/ Tarun Bafna	 	 
	 

	 	 

Gay Stanley Mayeux
	 	 	 	 	 	 

Tarun Bafna
	 	 
	 

	 	Attorney-in-Fact
	 	 	 	 	 	Authorized Signer	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	AMEC Americas Limited	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	By:
	 	/s/ Tarun Bafna	 	 
	 

	 	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	 	 	Tarun Bafna	 	 
	 

	 	 	 	 	 	 	 	Authorized Signer	 	 

Guarantee

Willbros Group, Inc. hereby guarantees the performance by Purchaser of all obligations, agreements
and covenants of Purchaser set forth in the above and foregoing Agreement, including the
indemnification obligations.

	 	 	 	 	 	 	 	 	 	 	 
	By:

	 	/s/ Gay Stanley Mayeux
	 	 	 	By:
	 	/s/ William L. Pardue	 	 
	 

	 	 

Gay Stanley Mayeux
	 	 	 	 	 	 

William L. Pardue
	 	 
	 

	 	Attorney-in-Fact
	 	 	 	 	 	Deputy Corporate Secretary	 	 

Disclosure Schedule *

 

* Omitted. Willbros Group, Inc. agrees to furnish supplementally a copy of the Disclosure Schedule
to the Securities and Exchange Commission upon request.

Share Purchase Agreement (Final)

-49-

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