Exhibit 99.2

NORTH AMERICAN ENERGY PARTNERS INC.

Consolidated Financial Statements

For the years ended March 31, 2011, 2010 and 2009

(Expressed in thousands of Canadian Dollars)



---

|     |  |                                                                              |  |                        |  |                                          
|---- |  | ---------------------------------------------------------------------------- |  | ---------------------- |  | -----------------------------------------
|LOGO |  | KPMG LLP Chartered Accountants
10125  102 Street Edmonton AB T5J 3V8
Canada |  | Telephone Fax
Internet |  | (780) 429-7300 (780) 429-7379
www.kpmg.ca

INDEPENDENT AUDITORS REPORT
OF REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Directors of North American Energy Partners Inc.

We have audited North American Energy Partners Inc.s internal control over financial reporting as of March 31, 2011, based on the criteria established
inInternal Control  Integrated Frameworkissued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). North
American Energy Partners Inc.s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in Managements
Report on Internal Control over Financial Reporting in the accompanying Managements Discussion and Analysis for the year ended March 31, 2011. Our responsibility is to express an opinion on North American Energy Partners Inc.s
internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting
Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included
obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit
also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable
detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with
generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention
or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk
that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, North American Energy Partners Inc. maintained, in all material respects, effective internal control over financial reporting as of March 31, 2011,
based on criteria established inInternal Control  Integrated Frameworkissued by the Committee of Sponsoring Organizations of the Treadway
Commission.

We also have audited, in accordance with Canadian generally accepted auditing standards and the standards of the Public Company Accounting
Oversight Board (United States), the consolidated balance sheets of North American Energy Partners Inc. as at March 31, 2011 and 2010, and the consolidated statements of operations and comprehensive (loss) income, changes in shareholders
equity, and cash flows for each of the years in the three-year period ended March 31, 2011, and our report dated June 2, 2011,expressed
an unqualified opinion on those consolidated financial statements.

LOGO

Chartered Accountants

Edmonton,
Canada

June 2, 2011



| |  |                                                                                                                                                                                                                            
| |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |  | KPMG LLP, is a Canadian limited liability partnership and a member firm of the KPMG network of independent member firms affiliated with KPMG International, a Swiss cooperative. KPMG Canada provides
services to KPMG LLP.



|  |  |           |  |                   
|- |  | --------- |  | ------------------
|2 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



|     |  |                                                                              |  |                        |  |                                          
|---- |  | ---------------------------------------------------------------------------- |  | ---------------------- |  | -----------------------------------------
|LOGO |  | KPMG LLP Chartered Accountants
10125  102 Street Edmonton AB T5J 3V8
Canada |  | Telephone Fax
Internet |  | (780) 429-7300 (780) 429-7379
www.kpmg.ca

INDEPENDENT AUDITORS REPORT
OF REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Directors of North American Energy Partners Inc.

We have audited the accompanying consolidated financial statements of North American Energy Partners Inc., which comprise the consolidated balance sheets as at
March 31, 2011 and 2010, and the consolidated statements of operations and comprehensive (loss) income, changes in shareholders equity, and cash flows for each of the years in the three-year period ended March 31, 2011, and notes, comprising a
summary of significant accounting policies and other explanatory information.

Managements
Responsibility for the Consolidated Financial Statements

Management is responsible for the
preparation and fair presentation of these consolidated financial statements in accordance with U.S. generally accepted accounting principles, and for such internal control as management determines is necessary to enable the preparation of
consolidated financial statements that are free from material misstatement, whether due to fraud or error.

Auditors Responsibility

Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We conducted our audits in accordance with Canadian
generally accepted auditing standards and the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we comply with ethical requirements and plan and perform an audit to obtain reasonable assurance
about whether the consolidated financial statements are free from material misstatement.

An audit involves performing procedures to obtain audit
evidence about the amounts and disclosures in the consolidated financial statements. The procedures selected depend on our judgment, including the assessment of the risks of material misstatement of the consolidated financial statements, whether due
to fraud or error. In making those risk assessments, we consider internal control relevant to the entitys preparation and fair presentation of the consolidated financial statements in order to design audit procedures that are appropriate in
the circumstances. An audit also includes evaluating the appropriateness of accounting policies used and the reasonableness of accounting estimates made by management, as well as evaluating the overall presentation of the consolidated financial
statements.

We believe that the audit evidence we have obtained in our audits is sufficient and appropriate to provide a basis for our audit opinion.

Opinion

In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of North American Energy Partners Inc. as at
March 31, 2011 and 2010 and its consolidated results of operations and its consolidated cash flows for each of the years in the three-year period ended March 31, 2011 in accordance with US generally accepted accounting principles.

Other Matter

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the North American Energy Partners
Inc.s internal control over financial reporting as of March 31, 2011, based on the criteria established inInternal Control  Integrated Frameworkissued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated June 2, 2011expressed an unmodified opinion on the effectiveness of the North American Energy Partners Inc.s internal control over financial reporting.

LOGO

Chartered Accountants

Edmonton,
Canada

June 2, 2011



| |  |                                                                                                                                                                                                                            
| |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |  | KPMG LLP, is a Canadian limited liability partnership and a member firm of the KPMG network of independent member firms affiliated with KPMG International, a Swiss cooperative. KPMG Canada provides
services to KPMG LLP.



|                   |  |           |  |  |   | 
|------------------ |  | --------- |  |  | - | 
|2011 Annual Report |  | |    NOA| |  |  | 3 | 



---

Consolidated Balance Sheets

As at March 31

(Expressed in thousands of Canadian Dollars)



|                                                                                                                                                                      |  |      |          |   |  |  |  |      |  |  |          |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---- | -------- | - |  |  |  | ---- |  |  | -------- | -
|                                                                                                                                                                      |  | 2011 |          |   |  |  |  | 2010 | 
|Assets                                                                                                                                                                |  |      |          |   |  |  |  |      |  |  |          |  
|Current assets                                                                                                                                                        |  |      |          |   |  |  |  |      |  |  |          |  
|Cash and cash equivalents                                                                                                                                             |  |      | $722     |   |  |  |  |      |  |  | $103,005 |  
|Accounts receivable, net (note 7 and 22(d))                                                                                                                           |  |      | 128,482  |   |  |  |  |      |  |  | 111,884  |  
|Unbilled revenue (note 8)                                                                                                                                             |  |      | 102,939  |   |  |  |  |      |  |  | 84,702   |  
|Inventories (note 9)                                                                                                                                                  |  |      | 7,735    |   |  |  |  |      |  |  | 3,047    |  
|Prepaid expenses and deposits (note 10)                                                                                                                               |  |      | 8,269    |   |  |  |  |      |  |  | 6,881    |  
|Investment in and advances to unconsolidated joint venture (note 11)                                                                                                  |  |      | 1,488    |   |  |  |  |      |  |  |         |  
|Deferred tax assets (note 18)                                                                                                                                         |  |      | 1,729    |   |  |  |  |      |  |  | 3,481    |  
|                                                                                                                                                                      |  |      | 251,364  |   |  |  |  |      |  |  | 313,000  |  
|Property, plant and equipment, net (note 13)                                                                                                                          |  |      | 321,864  |   |  |  |  |      |  |  | 331,355  |  
|Other assets (note 12(a))                                                                                                                                             |  |      | 26,908   |   |  |  |  |      |  |  | 22,154   |  
|Goodwill (note 5)                                                                                                                                                     |  |      | 32,901   |   |  |  |  |      |  |  | 25,111   |  
|Deferred tax assets (note 18)                                                                                                                                         |  |      | 49,920   |   |  |  |  |      |  |  | 15,300   |  
|Total Assets                                                                                                                                                          |  |      | $682,957 |   |  |  |  |      |  |  | $706,920 |  
|Liabilities and Shareholders Equity                                                                                                                                  |  |      |          |   |  |  |  |      |  |  |          |  
|Current liabilities                                                                                                                                                   |  |      |          |   |  |  |  |      |  |  |          |  
|Accounts payable                                                                                                                                                      |  |      | $86,053  |   |  |  |  |      |  |  | $66,876  |  
|Accrued liabilities (note 14)                                                                                                                                         |  |      | 32,814   |   |  |  |  |      |  |  | 47,191   |  
|Billings in excess of costs incurred and estimated earnings on uncompleted contracts                                                                                  |  |      |          |   |  |  |  |      |  |  |          |  
|(note 8)                                                                                                                                                              |  |      | 2,004    |   |  |  |  |      |  |  | 1,614    |  
|Current portion of capital lease obligations (note 15)                                                                                                                |  |      | 4,862    |   |  |  |  |      |  |  | 5,053    |  
|Current portion of term facilities (note 16(b))                                                                                                                       |  |      | 10,000   |   |  |  |  |      |  |  | 6,072    |  
|Current portion of derivative financial instruments (note 22(a))                                                                                                      |  |      | 2,474    |   |  |  |  |      |  |  | 22,054   |  
|Deferred tax liabilities (note 18)                                                                                                                                    |  |      | 27,612   |   |  |  |  |      |  |  | 16,781   |  
|                                                                                                                                                                      |  |      | 165,819  |   |  |  |  |      |  |  | 165,641  |  
|Capital lease obligations (note 15)                                                                                                                                   |  |      | 3,831    |   |  |  |  |      |  |  | 8,340    |  
|Long term debt (note 16(a))                                                                                                                                           |  |      | 286,970  |   |  |  |  |      |  |  | 225,494  |  
|Derivative financial instruments (note 22(a))                                                                                                                         |  |      | 9,054    |   |  |  |  |      |  |  | 75,001   |  
|Other long term obligations (note 17(a))                                                                                                                              |  |      | 25,576   |   |  |  |  |      |  |  | 19,642   |  
|Deferred tax liabilities (note 18)                                                                                                                                    |  |      | 44,441   |   |  |  |  |      |  |  | 31,744   |  
|                                                                                                                                                                      |  |      | 535,691  |   |  |  |  |      |  |  | 525,862  |  
|Shareholders equity                                                                                                                                                  |  |      |          |   |  |  |  |      |  |  |          |  
|Common shares (authorized  unlimited number of voting common shares; issued and outstanding  March 31, 2011 
36,242,526 (March 31, 2010  36,049,276) (note 19(a)) |  |      | 304,854  |   |  |  |  |      |  |  | 303,505  |  
|Additional paid-in capital                                                                                                                                            |  |      | 7,007    |   |  |  |  |      |  |  | 7,439    |  
|Deficit                                                                                                                                                               |  |      | (164,536 | ) |  |  |  |      |  |  | (129,886 | )
|Accumulated other comprehensive loss                                                                                                                                  |  |      | (59      | ) |  |  |  |      |  |  |         |  
|                                                                                                                                                                      |  |      | 147,266  |   |  |  |  |      |  |  | 181,058  |  
|Total liabilities and shareholders equity                                                                                                                            |  |      | $682,957 |   |  |  |  |      |  |  | $706,920 |  
|Commitments (note 26)                                                                                                                                                 |  |      |          |   |  |  |  |      |  |  |          |  
|Contingencies (note 29)                                                                                                                                               |  |      |          |   |  |  |  |      |  |  |          |  

Approved on behalf of the Board



| |  |                              |  |  |  |  |  |                         
| |  | ---------------------------- |  |  |  |  |  | ------------------------
| |  |                              |  | 
| |  |                              |  | 
| |  | /s/ Ronald A. McIntosh       |  |  |  |  |  | /s/ Allen R. Sello      
| |  | Ronald A. Mclntosh, Director |  |  |  |  |  | Allen R. Sello, Director

See accompanying notes to consolidated financial
statements.



|  |  |           |  |                   
|- |  | --------- |  | ------------------
|4 |  | |    NOA| |  | 2011 Annual Report



---



NAEP



Consolidated Statements of Operations and Comprehensive (Loss) Income

For the years ended March 31

(Expressed in thousands of
Canadian Dollars, except per share amounts)



|                                                                                     |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |          |  
|------------------------------------------------------------------------------------ |  | ---- | -------- | - |  |  |  | ---- |  |  | -------- | - |  | ---- |  |  |  |  | -------- | -
|                                                                                     |  | 2011 |          |   |  |  |  | 2010 |  |  |          |   |  | 2009 | 
|Revenue                                                                              |  |      | $858,048 |   |  |  |  |      |  |  | $758,965 |   |  |      |  |  |  |  | $972,536 |  
|Project costs                                                                        |  |      | 456,119  |   |  |  |  |      |  |  | 301,307  |   |  |      |  |  |  |  | 505,026  |  
|Equipment costs                                                                      |  |      | 234,933  |   |  |  |  |      |  |  | 209,408  |   |  |      |  |  |  |  | 217,120  |  
|Equipment operating lease expense                                                    |  |      | 69,420   |   |  |  |  |      |  |  | 66,329   |   |  |      |  |  |  |  | 43,583   |  
|Depreciation                                                                         |  |      | 39,440   |   |  |  |  |      |  |  | 42,636   |   |  |      |  |  |  |  | 36,389   |  
|Gross profit                                                                         |  |      | 58,136   |   |  |  |  |      |  |  | 139,285  |   |  |      |  |  |  |  | 170,418  |  
|General and administrative expenses                                                  |  |      | 59,932   |   |  |  |  |      |  |  | 62,530   |   |  |      |  |  |  |  | 74,460   |  
|Loss on disposal of property, plant and equipment                                    |  |      | 1,948    |   |  |  |  |      |  |  | 1,233    |   |  |      |  |  |  |  | 5,325    |  
|Loss on disposal of assets held for sale (note 12(b))                                |  |      | 825      |   |  |  |  |      |  |  | 373      |   |  |      |  |  |  |  | 24       |  
|Amortization of intangible assets (note 12(c))                                       |  |      | 3,540    |   |  |  |  |      |  |  | 1,719    |   |  |      |  |  |  |  | 1,501    |  
|Equity in loss (earnings) of unconsolidated joint venture (note 11)                  |  |      | 2,720    |   |  |  |  |      |  |  | (44      | ) |  |      |  |  |  |  |         |  
|Impairment of goodwill (note 5)                                                      |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  | 176,200  |  
|Operating (loss) income before the undernoted                                        |  |      | (10,829  | ) |  |  |  |      |  |  | 73,474   |   |  |      |  |  |  |  | (87,092  | )
|Interest expense, net (note 20)                                                      |  |      | 29,991   |   |  |  |  |      |  |  | 26,080   |   |  |      |  |  |  |  | 29,612   |  
|Foreign exchange (gain) loss                                                         |  |      | (1,659   | ) |  |  |  |      |  |  | (48,901  | ) |  |      |  |  |  |  | 47,272   |  
|Realized and unrealized (gain) loss on derivative financial instruments (note 22(a)) |  |      | (2,305   | ) |  |  |  |      |  |  | 54,411   |   |  |      |  |  |  |  | (37,250  | )
|Loss on debt extinguishment (note 16(c))                                             |  |      | 4,346    |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|Other income                                                                         |  |      | (104     | ) |  |  |  |      |  |  | (14      | ) |  |      |  |  |  |  | (5,955   | )
|(Loss) income before income taxes                                                    |  |      | (41,098  | ) |  |  |  |      |  |  | 41,898   |   |  |      |  |  |  |  | (120,771 | )
|Income taxes (note 18):                                                              |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |          |  
|Current                                                                              |  |      | 2,892    |   |  |  |  |      |  |  | 3,803    |   |  |      |  |  |  |  | 5,546    |  
|Deferred                                                                             |  |      | (9,340   | ) |  |  |  |      |  |  | 9,876    |   |  |      |  |  |  |  | 9,087    |  
|Net (loss) income                                                                    |  |      | (34,650  | ) |  |  |  |      |  |  | 28,219   |   |  |      |  |  |  |  | (135,404 | )
|Other comprehensive loss                                                             |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |          |  
|Unrealized foreign currency translation loss                                         |  |      | 59       |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|Comprehensive (loss) income                                                          |  |      | (34,709  | ) |  |  |  |      |  |  | 28,219   |   |  |      |  |  |  |  | (135,404 | )
|Net (loss) income per share  basic (note 19(b))                                     |  |      | $(0.96   | ) |  |  |  |      |  |  | $0.78    |   |  |      |  |  |  |  | $(3.76   | )
|Net (loss) income per share  diluted (note 19(b))                                   |  |      | $(0.96   | ) |  |  |  |      |  |  | $0.77    |   |  |      |  |  |  |  | $(3.76   | )

See
accompanying notes to consolidated financial statements.



|                   |  |           |  |  |   | 
|------------------ |  | --------- |  |  | - | 
|2011 Annual Report |  | |    NOA| |  |  | 5 | 



---

Consolidated Statements of Changes in Shareholders Equity

(Expressed in thousands of Canadian Dollars)



|                                                |  |              |          |  |  |  |  |                          |  |  |        |   |  |         |  |  |  |  |            |                                   |  |  |  |  |  |       |       |   |  |  |  |  |  |  |          |  
|----------------------------------------------- |  | ------------ | -------- |  |  |  |  | ------------------------ |  |  | ------ | - |  | ------- |  |  |  |  | ---------- | --------------------------------- |  |  |  |  |  | ----- | ----- | - |  |  |  |  |  |  | -------- | -
|                                                |  | Commonshares |          |  |  |  |  | Additionalpaid-incapital |  |  |        |   |  | Deficit |  |  |  |  |            | Accumulatedothercomprehensiveloss |  |  |  |  |  | Total |      
|Balance at March 31, 2008                       |  |              | $301,894 |  |  |  |  |                          |  |  | $4,351 |   |  |         |  |  |  |  | $(22,701   | )                                 |  |  |  |  |  |       | $    |   |  |  |  |  |  |  | $283,544 |  
|Net loss                                        |  |              |         |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  | (135,404   | )                                 |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (135,404 | )
|Share option plan                               |  |              |         |  |  |  |  |                          |  |  | 1,888  |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 1,888    |  
|Deferred performance share unit plan            |  |              |         |  |  |  |  |                          |  |  | 61     |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 61       |  
|Reclassification on exercise of stock options   |  |              | 834      |  |  |  |  |                          |  |  | (834   | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  |         |  
|Issued upon exercise of stock options           |  |              | 703      |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 703      |  
|Balance at March 31, 2009                       |  |              | $303,431 |  |  |  |  |                          |  |  | $5,466 |   |  |         |  |  |  |  | $(158,105) |                                   |  |  |  |  |  |       | $    |   |  |  |  |  |  |  | $150,792 |  
|Net income                                      |  |              |         |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  | 28,219     |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 28,219   |  
|Share option plan                               |  |              |         |  |  |  |  |                          |  |  | 2,135  |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 2,135    |  
|Deferred performance share unit plan            |  |              |         |  |  |  |  |                          |  |  | 123    |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 123      |  
|Reclassified to restricted share unit liability |  |              |         |  |  |  |  |                          |  |  | (20    | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (20      | )
|Reclassification on exercise of stock options   |  |              | 21       |  |  |  |  |                          |  |  | (21    | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  |         |  
|Cash settlement of stock options                |  |              |         |  |  |  |  |                          |  |  | (244   | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (244     | )
|Issued upon exercise of stock options           |  |              | 53       |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 53       |  
|Balance at March 31, 2010                       |  |              | $303,505 |  |  |  |  |                          |  |  | $7,439 |   |  |         |  |  |  |  | $(129,886) |                                   |  |  |  |  |  |       | $    |   |  |  |  |  |  |  | $181,058 |  
|Net loss                                        |  |              |         |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  | (34,650    | )                                 |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (34,650  | )
|Unrealized foreign currency translation loss    |  |              |         |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       | (59   | ) |  |  |  |  |  |  | (59      | )
|Share option plan                               |  |              |         |  |  |  |  |                          |  |  | 1,455  |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 1,455    |  
|Deferred performance share unit plan            |  |              |         |  |  |  |  |                          |  |  | (44    | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (44      | )
|Stock award plan                                |  |              |         |  |  |  |  |                          |  |  | 780    |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 780      |  
|Reclassification on exercise of stock options   |  |              | 386      |  |  |  |  |                          |  |  | (386   | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  |         |  
|Issued upon exercise of stock options           |  |              | 963      |  |  |  |  |                          |  |  |       |   |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | 963      |  
|Senior executive stock option plan              |  |              |         |  |  |  |  |                          |  |  | (2,237 | ) |  |         |  |  |  |  |           |                                   |  |  |  |  |  |       |      |   |  |  |  |  |  |  | (2,237   | )
|Balance at March 31, 2011                       |  |              | $304,854 |  |  |  |  |                          |  |  | $7,007 |   |  |         |  |  |  |  | $(164,536) |                                   |  |  |  |  |  |       | $(59) |   |  |  |  |  |  |  | $147,266 |  

See
accompanying notes to consolidated financial statements.



|  |  |           |  |                   
|- |  | --------- |  | ------------------
|6 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



Consolidated Statements of Cash Flows

For the years ended
March 31

(Expressed in thousands of Canadian Dollars)



|                                                                                  |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|--------------------------------------------------------------------------------- |  | ---- | -------- | - |  |  |  | ---- |  |  | -------- | - |  | ---- |  |  |  |  | --------- | -
|                                                                                  |  | 2011 |          |   |  |  |  | 2010 |  |  |          |   |  | 2009 | 
|Cash (used in) provided by:                                                       |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|Operating activities:                                                             |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|Net (loss) income for the period                                                  |  |      | $(34,650 | ) |  |  |  |      |  |  | $28,219  |   |  |      |  |  |  |  | $(135,404 | )
|Items not affecting cash:                                                         |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Depreciation                                                                      |  |      | 39,440   |   |  |  |  |      |  |  | 42,636   |   |  |      |  |  |  |  | 36,389    |  
|Equity in loss (earnings) of unconsolidated joint venture (note 11)               |  |      | 2,720    |   |  |  |  |      |  |  | (44      | ) |  |      |  |  |  |  |          |  
|Amortization of intangible assets (note 12(c))                                    |  |      | 3,540    |   |  |  |  |      |  |  | 1,719    |   |  |      |  |  |  |  | 1,501     |  
|Impairment of goodwill (note 5)                                                   |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  | 176,200   |  
|Amortization of deferred lease inducements (note 17(b))                           |  |      | (107     | ) |  |  |  |      |  |  | (107     | ) |  |      |  |  |  |  | (105      | )
|Amortization of deferred financing costs (note 12(d))                             |  |      | 1,609    |   |  |  |  |      |  |  | 3,348    |   |  |      |  |  |  |  | 2,970     |  
|Loss on disposal of property, plant and equipment                                 |  |      | 1,948    |   |  |  |  |      |  |  | 1,233    |   |  |      |  |  |  |  | 5,325     |  
|Loss on disposal of assets held for sale (note 12(b))                             |  |      | 825      |   |  |  |  |      |  |  | 373      |   |  |      |  |  |  |  | 24        |  
|Realized and unrealized foreign exchange (gain) loss on
83/4% senior notes        |  |      | (732     | ) |  |  |  |      |  |  | (48,920  | ) |  |      |  |  |  |  | 46,466    |  
|Unrealized (gain) loss on derivative financial instruments measured at fair value |  |      | (2,305   | ) |  |  |  |      |  |  | 38,852   |   |  |      |  |  |  |  | (39,921   | )
|Loss on debt extinguishment (note 16(c))                                          |  |      | 4,346    |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Stock-based compensation expense (note 28(a))                                     |  |      | 8,156    |   |  |  |  |      |  |  | 5,270    |   |  |      |  |  |  |  | 2,305     |  
|Cash settlement of stock options (note 28(b))                                     |  |      |         |   |  |  |  |      |  |  | (244     | ) |  |      |  |  |  |  |          |  
|Accretion of asset retirement obligation (note 17(c))                             |  |      | 35       |   |  |  |  |      |  |  | 5        |   |  |      |  |  |  |  | 155       |  
|Deferred income taxes (benefit) (note 18)                                         |  |      | (9,340   | ) |  |  |  |      |  |  | 9,876    |   |  |      |  |  |  |  | 9,087     |  
|Net changes in non-cash working capital (note 23(b))                              |  |      | (15,982  | ) |  |  |  |      |  |  | (39,591  | ) |  |      |  |  |  |  | 46,193    |  
|                                                                                  |  |      | (497     | ) |  |  |  |      |  |  | 42,625   |   |  |      |  |  |  |  | 151,185   |  
|Investing activities:                                                             |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|Acquisition, net of cash acquired (note 6)                                        |  |      | (23,501  | ) |  |  |  |      |  |  | (5,410   | ) |  |      |  |  |  |  |          |  
|Purchase of property, plant and equipment                                         |  |      | (36,417  | ) |  |  |  |      |  |  | (51,888  | ) |  |      |  |  |  |  | (87,102   | )
|Additions to intangible assets (note 12(c))                                       |  |      | (4,748   | ) |  |  |  |      |  |  | (3,362   | ) |  |      |  |  |  |  | (3,102    | )
|Investment in and advances to unconsolidated joint venture (note 11)              |  |      | (1,291   | ) |  |  |  |      |  |  | (2,873   | ) |  |      |  |  |  |  |          |  
|Proceeds on disposal of property, plant and equipment                             |  |      | 499      |   |  |  |  |      |  |  | 1,440    |   |  |      |  |  |  |  | 11,164    |  
|Proceeds on disposal of assets held for sale                                      |  |      | 826      |   |  |  |  |      |  |  | 2,482    |   |  |      |  |  |  |  | 325       |  
|                                                                                  |  |      | (64,632  | ) |  |  |  |      |  |  | (59,611  | ) |  |      |  |  |  |  | (78,715   | )
|Financing activities:                                                             |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|Repayment of credit facilities                                                    |  |      | (85,000  | ) |  |  |  |      |  |  | (6,906   | ) |  |      |  |  |  |  |          |  
|Increase in credit facilities                                                     |  |      | 128,524  |   |  |  |  |      |  |  | 34,700   |   |  |      |  |  |  |  |          |  
|Financing costs (note 16(b) and (d))                                              |  |      | (7,920   | ) |  |  |  |      |  |  | (1,123   | ) |  |      |  |  |  |  |          |  
|Redemption of
83/4% senior notes (note 16(c))                                     |  |      | (202,410 | ) |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Issuance of Series 1 Debentures (note 16(d))                                      |  |      | 225,000  |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Settlement of swap liabilities (note 22(a))                                       |  |      | (91,125  | ) |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Proceeds from stock options exercised (note 28(b))                                |  |      | 963      |   |  |  |  |      |  |  | 53       |   |  |      |  |  |  |  | 703       |  
|Repayment of capital lease obligations                                            |  |      | (5,127   | ) |  |  |  |      |  |  | (5,613   | ) |  |      |  |  |  |  | (6,156    | )
|                                                                                  |  |      | (37,095  | ) |  |  |  |      |  |  | 21,111   |   |  |      |  |  |  |  | (5,453    | )
|(Decrease) increase in cash and cash equivalents                                  |  |      | (102,224 | ) |  |  |  |      |  |  | 4,125    |   |  |      |  |  |  |  | 67,017    |  
|Effect of exchange rate on changes in cash                                        |  |      | (59      | ) |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Cash and cash equivalents, beginning of year                                      |  |      | 103,005  |   |  |  |  |      |  |  | 98,880   |   |  |      |  |  |  |  | 31,863    |  
|Cash and cash equivalents, end of year                                            |  |      | $722     |   |  |  |  |      |  |  | $103,005 |   |  |      |  |  |  |  | $98,880   |  

Supplemental cash flow information (note 23(a))

See accompanying
notes to consolidated financial statements.



|                   |  |           |  |  |   | 
|------------------ |  | --------- |  |  | - | 
|2011 Annual Report |  | |    NOA| |  |  | 7 | 



---

Notes to Consolidated Financial Statements

For the years ended March 31, 2011, 2010, 2009

(Expressed in thousands of Canadian Dollars, except per share amounts
or unless otherwise specified)

1. Nature of operations

North American Energy Partners Inc. (the Company), formerly NACG Holdings Inc., was incorporated under the Canada Business Corporations Act on October 17, 2003. On November 26, 2003, the
Company purchased all the issued and outstanding shares of North American Construction Group Inc. (NACGI), including subsidiaries of NACGI, from Norama Ltd. which had been operating continuously in Western Canada since 1953. The Company
had no operations prior to November 26, 2003. The Company undertakes several types of projects including mining and environmental services, heavy construction, industrial and commercial site development and pipeline and piling installations.
The Company also designs and manufactures screw piles, provides tank maintenance services to the petro-chemical industry across Canada and the United States and sells pipeline anchoring systems globally.

2. Significant accounting policies

a) Basis of
presentation

These consolidated financial statements are prepared in accordance with United States generally accepted accounting principles
(US GAAP). Material inter-company transactions and balances are eliminated upon consolidation. Material items that give rise to measurement and disclosure differences to the consolidated financial statements under Canadian GAAP are
outlined in note 31.

These consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, NACGI, North American
Fleet Company Ltd., North American Construction Projects Inc., North American Major Mining Projects Inc., North American Construction Management Inc. and NACG Properties Inc., and the following 100% owned subsidiaries of NACGI:



|                                   |  |                                                 
|---------------------------------- |  | ------------------------------------------------
| North American Caisson Ltd.      |  |  North American Services Inc.                  
| North American Construction Ltd. |  |  North American Site Development Ltd.          
| North American Engineering Inc.  |  |  North American Site Services Inc.             
| North American Enterprises Ltd.  |  |  North American Tailings and Environmental Ltd.
| North American Industries Inc.   |  |  DF Investments Limited                        
| North American Maintenance Ltd.  |  |  Drillco Foundation Co. Ltd.                   
| North American Mining Inc.       |  |  Cyntech Canada Inc.                           
| North American Pile Driving Inc. |  |  Cyntech Services Inc.                         
| North American Pipeline Inc.     |  |  Cyntech U.S. Inc.                             
| North American Road Inc.         |  |                                                 

b) Use of estimates

The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of
assets and liabilities, disclosures reported in these consolidated financial statements and accompanying notes and the reported amounts of revenues and expenses during the reporting period.

Significant estimates made by management include the assessment of the percentage of completion on time-and-materials, unit-price and lump-sum contracts (including estimated total costs and provisions for estimated
losses) and the recognition of claims and change orders on revenue contracts; assumptions used to value free standing and embedded derivatives and other financial instruments; assumptions used in periodic impairment testing; and, estimates and
assumptions used in the determination of the allowance for doubtful accounts, the recoverability of deferred tax assets and the useful lives of property, plant and equipment and intangible assets. Actual results could differ materially from those
estimates.

The length of the Companys contracts varies from less than one year for typical contracts to several years for certain larger
contracts. Contract project costs include all direct labour, material, subcontract and equipment costs and those indirect costs related to contract performance such as indirect labour, supplies, and tools. General and administrative expenses are
charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined.

The
accuracy of the Companys revenue and profit recognition in a given period is dependent on the accuracy of its estimates of the cost to complete each project. Cost estimates for all of significant projects use a detailed bottom up
approach and the Company believes its experience allows it to provide reasonably dependable estimates. There are a number of factors that can contribute to changes in estimates of contract cost and profitability that are recognized in the period in
which such adjustments are determined. The most significant of these include:



| |  | the completeness and accuracy of the original bid;
|- |  | --------------------------------------------------



| |  | costs associated with added scope changes (to the extent contract remedies are unavailable);
|- |  | --------------------------------------------------------------------------------------------



|  |  |           |  |                   
|- |  | --------- |  | ------------------
|8 |  | |    NOA| |  | 2011 Annual Report



---

NAEP





| |  | extended overhead due to owner, weather and other delays (to the extent contract remedies are unavailable);
|- |  | -----------------------------------------------------------------------------------------------------------



| |  | subcontractor performance issues;
|- |  | ---------------------------------



| |  | changes in economic indices used for the determination of escalation or de-escalation for contractual rates on long-term contracts;
|- |  | -----------------------------------------------------------------------------------------------------------------------------------



| |  | changes in productivity expectations;
|- |  | -------------------------------------



| |  | site conditions that differ from those assumed in the original bid (to the extent contract remedies are unavailable);
|- |  | ---------------------------------------------------------------------------------------------------------------------



| |  | contract incentive and penalty provisions;
|- |  | ------------------------------------------



| |  | the availability and skill level of workers in the geographic location of the project; and
|- |  | ------------------------------------------------------------------------------------------



| |  | a change in the availability and proximity of equipment and materials.
|- |  | ----------------------------------------------------------------------

The foregoing factors as well as the mix of contracts at different margins may cause fluctuations in gross profit between periods. With many projects of varying levels of complexity and size in process at any given
time, changes in estimates can offset each other without materially impacting the Companys profitability. Major changes in cost estimates, particularly in larger, more complex projects, can have a significant effect on profitability.

c) Revenue recognition

The Company performs its
projects under the following types of contracts: time-and-materials; cost-plus; unit-price; and lump-sum. Revenue is recognized as costs are incurred for time-and-materials and cost-plus service contracts with no clearly defined scope. Revenue on
cost-plus, unit-price, lump-sum and time-and-materials contracts with defined scope is recognized using the percentage-of-completion method, measured by the ratio of costs incurred to date to estimated total costs. The estimated total cost of the
contract and percent complete is determined based upon estimates made by management. The costs of items that do not relate to performance of contracted work, particularly in the early stages of the contract, are excluded from costs incurred to date.
The resulting percent complete methodology is applied to the approved contract value to determine the revenue recognized. Customer payment milestones typically occur on a periodic basis over the period of contract completion.

The length of the Companys contracts varies from less than one year for typical contracts to several years for certain larger contracts. Contract project
costs include all direct labour, material, subcontract and equipment costs and those indirect costs related to contract performance such as indirect labour, supplies, and tools. General and administrative expenses are charged to expense as incurred.
Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes in project performance, project conditions, and estimated profitability, including those arising from contract penalty
provisions and final contract settlements, may result in revisions to costs and revenue that are recognized in the period in which such adjustments are determined. Profit incentives are included in revenue when their realization is reasonably
assured.

Once a project is underway, the Company will often experience changes in conditions, client requirements, specifications, designs, materials
and work schedule. Generally, a change order will be negotiated with the customer to modify the original contract to approve both the scope and price of the change. Occasionally, however, disagreements arise regarding changes, their
nature, measurement, timing and other characteristics that impact costs and revenue under the contract. When a change becomes a point of dispute between the Company and a customer, the Company will then consider it as a claim.

Costs related to unapproved change orders and claims are recognized when they are incurred.

Revenues related to unapproved change orders and claims are included in total estimated contract revenue only to the extent that contract costs related to the claim have been incurred and when it is probable that
the unapproved change order or claim will result in:



| |  | a bona fide addition to contract value; and
|- |  | -------------------------------------------



| |  | revenues can be reliably estimated.
|- |  | -----------------------------------

These two
conditions are satisfied when:



| |  | the contract or other evidence provides a legal basis for the unapproved change order or claim or a legal opinion is obtained providing a reasonable basis to
support the unapproved change order or claim;
|- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  | additional costs incurred were caused by unforeseen circumstances and are not the result of deficiencies in the Companys performance;
|- |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  | costs associated with the unapproved change order or claim are identifiable and reasonable in view of work performed; and
|- |  | -------------------------------------------------------------------------------------------------------------------------



| |  | evidence supporting the unapproved change order or claim is objective and verifiable.
|- |  | -------------------------------------------------------------------------------------

This can lead to a situation where costs are recognized in one period and revenue is recognized when customer agreement is obtained or claim resolution occurs, which can be in subsequent periods. Historical claim
recoveries should not be considered indicative of future claim recoveries.



|                   |  |           |  |  |   | 
|------------------ |  | --------- |  |  | - | 
|2011 Annual Report |  | |    NOA| |  |  | 9 | 



---

The Companys long term contracts typically allow its customers to unilaterally reduce or eliminate the scope of
the work as contracted without cause. These long term contracts represent higher risk due to uncertainty of total contract value and estimated costs to complete; therefore, potentially impacting revenue recognition in future periods.

A contract is regarded as substantially completed when remaining costs and potential risks are insignificant in amount.

The Company recognizes revenue from the sale of its other products and services as follows:



| |  | Revenue recognition from equipment rentals occurs when there is a written arrangement in the form of a contract or purchase order with the customer, a fixed or
determinable sales price is established with the customer, performance requirements are achieved, and ultimate collection of the revenue is reasonably assured. Equipment rental revenue is recognized as performance requirements are achieved in
accordance with the terms of the relevant agreement with the customer, either at a monthly fixed rate or on a usage basis dependent on the number of hours that the equipment is used;
|- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  | Revenue from tank services is provided based upon orders and contracts with the customer that include fixed or determinable prices based upon daily, hourly or
job rates and is recognized as the services are provided to the customer; and
|- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  | Revenue from anchor manufacturing and product sales is recognized when the products are shipped to the customer.
|- |  | ----------------------------------------------------------------------------------------------------------------

The Company recognizes revenue from the foregoing activities once persuasive evidence of an arrangement exists, delivery has occurred or services have been
rendered, fees are fixed and determinable and collectability is reasonably assured.

d) Balance sheet classifications

A one-year time period is typically used as the basis for classifying all other current assets and liabilities. However, included in current assets and liabilities
are amounts receivable and payable under construction contracts (principally holdbacks) that may extend beyond one year.

e) Cash and cash equivalents

Cash and cash equivalents include cash on hand, bank balances net of outstanding cheques and short-term investments with maturities of three months
or less when purchased.

f) Accounts receivable and unbilled revenue

Accounts receivable in the accompanying Consolidated Balance Sheets are primarily comprised of amounts billed to clients for services already provided, but which have not yet been collected. Unbilled revenue
represents revenue recognized in advance of amounts billed to clients.

g) Billings in excess of costs incurred and estimated earnings on uncompleted
contracts

Billings in excess of costs incurred and estimated earnings on uncompleted contracts represent amounts invoiced in excess of revenue
recognized.

h) Allowance for doubtful accounts

The Company evaluates the probability of collection of accounts receivable and records an allowance for doubtful accounts, which reduces accounts receivable to the
amount management reasonably believes will be collected. In determining the amount of the allowance, the following factors are considered: the length of time the receivable has been outstanding, specific knowledge of each customers financial
condition and historical experience.

i) Inventories

Inventories are carried at the lower of weighted average cost and market, and consist primarily of spare tires, job materials, manufacturing raw materials and finished goods. Finished goods cost includes raw
materials, labour and a reasonable allocation of appropriate overhead costs.

j) Property, plant and equipment

Property, plant and equipment are recorded at cost. Major components of heavy construction equipment in use such as engines and drive trains are recorded
separately. Equipment under capital lease is recorded at the present value of minimum lease payments at the inception of the lease. Depreciation is not recorded until an asset is available for use. Depreciation for each category is calculated based
on the cost, net of the estimated residual value, over the estimated useful life of the assets on the following bases and annual rates:



|                              |  |                   |  |                                                     
|----------------------------- |  | ----------------- |  | ----------------------------------------------------
|Assets                        |  | Basis             |  | Rate                                                
|Heavy equipment               |  | Straight-line     |  | Operating hours                                     
|Major component parts in use  |  | Straight-line     |  | Operating hours                                     
|Other equipment               |  | Straight-line     |  | 5  10 years                                        
|Licensed motor vehicles       |  | Declining balance |  | 30%                                                 
|Office and computer equipment |  | Straight-line     |  | 4 years                                             
|Buildings                     |  | Straight-line     |  | 10 years                                            
|Leasehold improvements        |  | Straight-line     |  | Over shorter of estimated useful life and lease term
|Assets under capital lease    |  | Declining balance |  | 30%                                                 



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|10 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The costs for periodic repairs and maintenance are expensed to the extent the expenditures serve only to restore the assets to their normal operating condition
without enhancing their service potential or extending their useful lives.

k) Capitalized interest

The Company capitalizes interest incurred on debt during the construction of assets for the Companys own use. The capitalization period covers the duration of
the activities required to get the asset ready for its intended use, provided that expenditures for the asset have been made and interest cost incurred. Interest capitalization continues as long as those activities and the incurrence of interest
cost continue. The capitalized interest is amortized at the same rate as the respective asset.

l) Goodwill

Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and
separately recognized. Goodwill is not amortized but instead is tested for impairment annually or more frequently if events or changes in circumstances indicate that it may be impaired. Goodwill is assigned, as of the date of the business
combination, to reporting units that are expected to benefit from the business combination. The impairment test is carried out in two steps. In the first step, the carrying amount of the reporting unit, including goodwill, is compared to its fair
value. When the fair value of the reporting unit exceeds its carrying amount, goodwill of the reporting unit is not considered to be impaired and the second step of the impairment test is unnecessary. The second step is carried out when the carrying
amount of a reporting unit exceeds its fair value, in which case, the implied fair value of the reporting units goodwill, determined in the same manner as the value of goodwill is determined in a business combination, is compared with its
carrying amount to measure the amount of the impairment loss, if any.

The Company performs its annual goodwill assessment on October 1 of each year
and when a triggering event occurs between annual impairment tests.

m) Intangible assets

Intangible assets include:



| |  | Customer relationships and backlog, which are being amortized over the remaining lives of the related contracts and relationships;
|- |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  | trade names, which are being amortized on a straight-line basis over their estimated useful lives of between five and ten years;
|- |  | --------------------------------------------------------------------------------------------------------------------------------



| |  | non-competition agreements, which are being amortized on a straight-line basis between the three and five-year terms of the respective agreements;
|- |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  | capitalized computer software and development costs, which are being amortized on a straight-line basis over a maximum period of four years; and
|- |  | ------------------------------------------------------------------------------------------------------------------------------------------------



| |  | patents, which are being amortized on a straight-line basis over estimated useful lives of up to six years.
|- |  | -----------------------------------------------------------------------------------------------------------

The Company expenses or capitalizes costs associated with the development of internal-use software as follows:

Preliminary project stage: Both internal and external costs incurred during this stage are expensed as incurred.

Application development stage: Both internal and external costs incurred to purchase and develop computer software are capitalized after the preliminary
project stage is completed and management authorizes the computer software project. However, training costs and the process of data conversion from the old system to the new system, which includes purging or cleansing of existing data,
reconciliation or balancing of old data to the converted data in the new system, are expensed as incurred.

Post implementation/operation stage:
All training costs and maintenance costs incurred during this stage are expensed as incurred.

Costs of upgrades and enhancements are capitalized if the
expenditures will result in adding functionality to the software.

n) Impairment of long-lived assets

Long-lived assets or asset groups held and used including plant, equipment and identifiable intangible assets subject to amortization are reviewed for impairment
whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of an asset or group of
assets is less than its carrying amount, it is considered to be impaired. The Company measures the impairment loss as the amount by which the carrying amount of the asset or group of assets exceeds its fair value, which is charged to depreciation or
amortization expense. In determining whether an impairment exists, the Company makes assumptions about the future cash flows expected from the use of its long-lived assets, such as: applicable industry performance and prospects; general business and
economic conditions that prevail and are expected to prevail; expected growth; maintaining its customer base; and, achieving cost reductions. There can be no assurance that expected future cash flows will be realized, or will be sufficient to
recover the carrying amount of long-lived assets. Furthermore, the process of determining fair values is subjective and requires management to exercise judgment in making assumptions about future results, including revenue and cash flow projections
and discount rates.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 11 | 



---

o) Assets held for sale

Long-lived assets are classified as held for sale when certain criteria are met, which include:



| |  | management, having the authority to approve the action, commits to a plan to sell the assets;
|- |  | ---------------------------------------------------------------------------------------------



| |  | the assets are available for immediate sale in their present condition;
|- |  | -----------------------------------------------------------------------



| |  | an active program to locate buyers and other actions to sell the assets have been initiated;
|- |  | --------------------------------------------------------------------------------------------



| |  | the sale of the assets is probable and their transfer is expected to qualify for recognition as a completed sale within one year;
|- |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  | the assets are being actively marketed at reasonable prices in relation to their fair value; and
|- |  | ------------------------------------------------------------------------------------------------



| |  | it is unlikely that significant changes will be made to the plan to sell the assets or that the plan will be withdrawn.
|- |  | -----------------------------------------------------------------------------------------------------------------------

Assets to be disposed of by sale are reported at the lower of their carrying amount or fair value less costs to sell and are disclosed separately on the
Consolidated Balance Sheets. These assets are not depreciated.

p) Asset retirement obligations

Asset retirement obligations are legal obligations associated with the retirement of property, plant and equipment that result from their acquisition, lease,
construction, development or normal operations. The Company recognizes its contractual obligations for the retirement of certain tangible long-lived assets. The fair value of a liability for an asset retirement obligation is recognized in the period
in which it is incurred if a reasonable estimate of fair value can be made. The fair value of a liability for an asset retirement obligation is the amount at which that liability could be settled in a current transaction between willing parties,
that is, other than in a forced or liquidation transaction and, in the absence of observable market transactions, is determined as the present value of expected cash flows. The associated asset retirement costs are capitalized as part of the
carrying amount of the long-lived asset and then amortized using a systematic and rational method over its estimated useful life. In subsequent reporting periods, the liability is adjusted for the passage of time through an accretion charge and any
changes in the amount or timing of the underlying future cash flows are recognized as an additional asset retirement cost.

q) Foreign currency
translation

The functional currency of the Company and the majority of its subsidiaries is Canadian Dollars. Transactions denominated in foreign
currencies are recorded at the rate of exchange on the transaction date. Monetary assets and liabilities, denominated in foreign currencies, are translated into Canadian Dollars at the rate of exchange prevailing at the balance sheet date. Foreign
exchange gains and losses are included in the determination of earnings.

Accounts of the Companys US-based subsidiary, which has a US Dollar
functional currency, are translated into Canadian Dollars using the current rate method. Assets and liabilities are translated at the rate of exchange in effect at the balance sheet date, and revenue and expense items (including depreciation and
amortization) are translated at the average rate of exchange for the period. The resulting unrealized exchange gains and losses from these translation adjustments are included as a separate component of shareholders equity in Accumulated Other
Comprehensive Income (Loss). The effect of exchange rate changes on cash balances held in foreign currencies is separately reported as part of the reconciliation of the change in cash and cash equivalents for the period.

r) Fair value measurement

Fair value measurements are
categorized using a valuation hierarchy for disclosure of the inputs used to measure fair value, which prioritizes the inputs into three broad levels. Fair values included in Level 1 are determined by reference to quoted prices in active markets for
identical assets and liabilities. Fair values included in Level 2 include valuations using inputs based on observable market data, either directly or indirectly other than the quoted prices. Level 3 valuations are based on inputs that are not based
on observable market data. The classification of a fair value within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

s) Derivative financial instruments

The Company uses derivative financial instruments to manage financial
risks from fluctuations in exchange rates and interest rates. These instruments include cross-currency and interest rate swap agreements as well as embedded price escalation features in revenue and supplier contracts. All such instruments are only
used for risk management purposes. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. Derivative financial instruments are subject to standard credit terms and conditions, financial controls,
management and risk monitoring procedures. These derivative financial instruments are not designated as hedges for accounting purposes and are recorded at fair value with realized and unrealized gains and losses recognized in the Consolidated
Statements of Operations.

t) Income taxes

The
Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized based on the differences between the financial statement carrying amounts of
existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be
recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in income in the



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|12 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



period of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not (greater than 50%) of being sustained. Changes in recognition or
measurement are reflected in the period in which the change in judgement occurs. The Company accrues interest and penalties for uncertain tax positions in the period in which these uncertainties are identified. Interest and penalties are included in
Other income in the Consolidated Statements of Operations. A valuation allowance is recorded against any deferred tax asset if it is more likely than not that the asset will not be realized.

u) Stock-based compensation

The Company has a Share Option
Plan which is described in note 28(b). The Company accounts for all stock-based compensation payments that are settled by the issuance of equity instruments at fair value. Compensation cost is measured using the Black-Scholes model at the grant date
and is expensed on a straight-line basis over the awards vesting period, with a corresponding increase to additional paid-in capital. Upon exercise of a stock option, share capital is recorded at the sum of proceeds received and the related
amount of additional paid-in capital.

The Company has a Senior Executive Stock Option Plan which is described in note 28(c). This compensation plan
allows the option holder the right to settle options in cash. The liability is measured at fair value using the Black-Scholes model at the modification date and subsequently at each period end date. Changes in fair value of the liability are
recognized in the Consolidated Statements of Operations.

The Company has a Deferred Performance Share Unit (DPSU) Plan which is described in
note 28(d). This compensation plan is settled, at the Companys option, either by the issuance of equity instruments or by cash payment. Compensation cost is measured using the Black-Scholes model at the grant date and is expensed on a
straight-line basis over the awards vesting period, with a corresponding increase to additional paid-in capital. The vesting of awards under the DPSU plan is contingent upon certain performance criteria being achieved. The fair value of each
share option grant under the DPSU plan assumes that the relevant performance criteria will be achieved and compensation cost is recorded to the extent that vesting of the award is considered probable. When it is determined that such criteria are not
probable of being achieved, no compensation cost is recognized and any previously recognized compensation cost is reversed.

The Company has a Restricted
Share Unit (RSU) Plan which is described in note 28(e). RSUs are granted effective April 1 of each fiscal year with respect to services to be provided in that fiscal year and the following two fiscal years. The RSUs vest at the end
of a three-year term. The Company classifies RSUs as a liability as the Company has the ability and intent to settle the awards in cash. Compensation expense is calculated based on the number of vested shares multiplied by the fair market value of
each RSU as determined by the volume weighted average trading price of the Companys common shares for the five trading days immediately preceding the day on which the fair market value is to be determined. The Company recognizes compensation
expense over the three-year term of the RSU in the Consolidated Statements of Operations.

The Company has a Directors Deferred Stock Unit
(DDSU) Plan which is described in note 28(f). The DDSU plan enables directors to receive all or a portion of their fee for that fiscal year in the form of deferred stock units. The deferred stock units are settled in cash and are
classified as a liability on the Consolidated Balance Sheets. The measurement of the liability and compensation costs for these awards is based on the fair value of the unit and is recorded as a charge to operating income when issued. Subsequent
changes in the Companys payment obligation after issuing the unit and prior to the settlement date are recorded as a charge to operating income in the period such changes occur.

The Company has a Stock Award Plan which is described in note 28(g). The stock awards are settled at the Companys option, either by the issuance of equity instruments if all necessary shareholder approvals
and regulatory approvals are obtained or by cash payment. Compensation cost is measured using the Black-Scholes model at the grant date and is expensed on a straight-line basis over the awards vesting period, with a corresponding increase to
additional paid-in capital.

v) Net income (loss) per share

Basic net income (loss) per share is computed by dividing net income available to common shareholders by the weighted average number of shares outstanding during the year (see note 19(b)). Diluted per share amounts
are calculated using the treasury stock method. The treasury stock method increases the diluted weighted average shares outstanding to include additional shares from the assumed exercise of stock options, if dilutive. The number of additional shares
is calculated by assuming outstanding in-the-money stock options were exercised and the proceeds from such exercises, including any unamortized stock-based compensation cost, were used to acquire shares of common stock at the average market price
during the year.

w) Leases

Leases entered into
by the Company in which substantially all the benefits and risks of ownership are transferred to the Company are recorded as obligations under capital leases, and under the corresponding category of property, plant and equipment. Obligations under
capital leases reflect the present value of future lease payments, discounted at an appropriate interest rate, and are reduced by rental payments net of imputed interest. All other leases are classified as operating leases and leasing costs,
including any rent holidays, leasehold incentives, and rent concessions, are amortized on a straight-line basis over the lease term.

Certain operating
lease and rental agreements provide a maximum hourly usage limit, above which the Company will be required to pay for the over hour usage as a contingent rent expense. These contingent expenses are recognized when the



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 13 | 



---

achievement of specified targets is considered probable and are due at the end of the lease term or rental period. The contingent rental expenses are included in Equipment operating lease
expense in the Consolidated Statements of Operations.

x) Deferred financing costs

Underwriting, legal and other direct costs incurred in connection with the issuance of debt not measured under the fair value option are presented as deferred financing costs. The deferred financing costs related
to the senior notes, debentures and the revolving and term loan facilities are amortized over the term of the related debt using the effective interest method.

y) Investments in unconsolidated joint ventures or affiliates

Investments in unconsolidated joint ventures or
affiliates over which the Company has significant influence including the Companys investment in Noramac Ventures Inc. are accounted for under the equity method of accounting, whereby the investment is carried at the cost of acquisition,
including subsequent capital contributions and loans from the Company, plus the Companys equity in undistributed earnings or losses since acquisition. Investments in unconsolidated joint ventures are included as investment in and advances to
unconsolidated joint venture in the Companys Consolidated Balance Sheets.

z) Business combinations

The Company accounts for all business combinations using the acquisition method. Acquisition related costs which include finders fees, advisory, legal,
accounting, valuation, other professional or consulting fees, and administrative costs are expensed as incurred.

3. United States accounting
pronouncements recently adopted

a) Improvements to financial reporting by enterprises involved with variable interest entities

In December 2009, the FASB issued ASU No. 2009-17, Improvements to Financial Reporting by Enterprises Involved with Variable Interest Entities,
which amends ASC 810, Consolidation. The amendments give guidance and clarification on how to determine when a reporting entity should include the assets, liabilities, non-controlling interests and results of activities of a variable
interest entity in its consolidated financial statements. The Company adopted this ASU effective April 1, 2010. The adoption of this standard did not have a material effect on the Companys consolidated financial statements.

b) Embedded credit derivatives

In March 2010, the FASB
issued ASU No. 2010-11, Scope Exception Related to Embedded Credit Derivatives, which clarifies that financial instruments that contain embedded credit-derivative features related only to the transfer of credit risk in the form of
subordination of one instrument to another are not subject to bifurcation and separate accounting. The scope exception only applies to an embedded derivative feature that relates to subordination between tranches of debt issued by an entity and
other features that relate to another type of risk must be evaluated for separation as an embedded derivative. The Company adopted this ASU effective July 1, 2010. The adoption of this standard did not have a material effect on the
Companys consolidated financial statements.

4. Recent United States accounting pronouncements not yet adopted

a) Revenue recognition

In October 2009, the FASB issued ASU
No. 2009-13, Revenue Recognition: Multiple-Deliverable Revenue Arrangements, which addresses the accounting for multiple-deliverable arrangements to enable vendors to account for products or services separately rather than as a
combined unit. The amendments establish a selling price hierarchy for determining the selling price of a deliverable. The amendments also eliminate the residual method of allocation and require that arrangement consideration be allocated at the
inception of the arrangement to all deliverables using the relative selling price method. For the Company, this ASU is effective prospectively for revenue arrangements entered into or materially modified on or after April 1, 2011. The adoption
of this ASU will not have a material effect on the Companys consolidated financial statements.

b) Share based payment awards

In April 2010, the FASB issued ASU No. 2010-13, Effect of Denominating the Exercise Price of a Share-Based Payment Award in the Currency of the Market in
Which the Underlying Equity Security Trades, which clarifies that an employee share-based payment award with an exercise price denominated in the currency of a market in which a substantial portion of the entitys equity securities trades
should not be considered to contain a condition that is not a market, performance, or service condition. Therefore, an entity would not classify such an award as a liability if it otherwise qualifies as equity. This ASU will amend ASC 718,
Compensation  Stock Compensation and it is effective for the Company beginning on April 1, 2011. The adoption of this ASU will not have a material effect on the Companys consolidated financial statements.

c) Intangibles  Goodwill and Other

In December 2010,
the FASB issued ASU No. 2010-28, When to Perform Step 2 of the Goodwill Impairment Test for Reporting Units with Zero or Negative Carrying Amounts, which amends ASC 350, Intangibles-Goodwill and Other to modify step 1 of
the goodwill impairment test for reporting units with zero or negative carrying amounts, to require an entity to perform Step 2 of the goodwill impairment test if it is more likely than not that a goodwill impairment exists. In determining whether
it is more likely than not that goodwill impairment exists, an entity should consider whether there are any adverse



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|14 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



qualitative factors indicating that impairment may exist. For the Company, this ASU is effective for the fiscal year and interim periods beginning April 1, 2011. The adoption of this ASU
will not have a material effect on the Companys consolidated financial statements.

d) Business Combinations

In December 2010, the FASB issued ASU No. 2010-29, Disclosure of Supplementary Pro Forma Information for Business Combinations, which amends ASC
805, Business Combinations, to require that pro-forma information be presented as if the business combination occurred at the beginning of the prior annual reporting period for the purposes of calculating both the current reporting
period and the prior reporting period pro forma financial information. The ASU also requires the disclosure be accompanied by a narrative description of the nature and amount of material, nonrecurring pro forma adjustments. For the Company, this ASU
is effective prospectively for business combinations for which the acquisition date is on or after April 1, 2011. This standard will impact disclosures made for business combinations completed by the Company after the effective date.

5. Goodwill

In accordance with the
Companys accounting policy, a goodwill impairment test is completed on October 1 of each fiscal year or whenever events or changes in circumstances indicate that impairment may exist. The Company conducted its annual goodwill impairment
tests on October 1, 2010 and 2009 and concluded that there was no goodwill impairment as the fair value of the Piling reporting unit exceeded its carrying value. There were no triggering events between October 1, 2010 and March 31,
2011.

The changes in goodwill during the years ended March 31, 2011, 2010 and 2009 are as follows:



|                                                                           |  |  |          |  
|-------------------------------------------------------------------------- |  |  | -------- | -
|Balance at March 31, 2008                                                  |  |  | $200,072 |  
|Impairment of goodwill (assigned to Pipeline segment)                      |  |  | (32,753  | )
|Impairment of goodwill (assigned to Heavy Construction and Mining segment) |  |  | (125,447 | )
|Impairment of goodwill (assigned to Piling segment)                        |  |  | (18,000  | )
|Balance at March 31, 2009                                                  |  |  | $23,872  |  
|Acquisition of goodwill (assigned to the Piling segment) (note 6(b))       |  |  | 1,239    |  
|Balance at March 31, 2010                                                  |  |  | 25,111   |  
|Acquisition of goodwill (assigned to the Piling segment) (note 6(a))       |  |  | 7,790    |  
|Balance at March 31, 2011                                                  |  |  | $32,901  |  

6. Acquisitions

a) Acquisitions in fiscal 2011

On
November 1, 2010, the Company acquired all of the assets of Cyntech Corporation and its wholly-owned subsidiary Cyntech Anchor Systems LLC (collectively Cyntech), for consideration of $23,501. Cyntech is based in Calgary, Alberta
and designs and manufactures screw piles and pipeline anchoring systems, and provides tank maintenance services to the petro-chemical industry. As a result of this acquisition, the Company gains access to screw piling, pipeline anchor design and
manufacturing capabilities in Canada and the United States. The Company also gains oil and gas storage tank repair and maintenance capabilities which complement the Companys existing service offering. The transaction was accounted for using
the acquisition method with the results of operations included in the financial statements from the date of acquisition. Acquisition related costs were recorded in general and administrative expenses. The goodwill acquired is deductible for tax
purposes.

The following table summarizes the recognized amounts of the assets acquired and liabilities assumed at the acquisition date:



|                              |  |  |         |  
|----------------------------- |  |  | ------- | -
|Accounts receivable           |  |  | $7,064  |  
|Inventories                   |  |  | 1,646   |  
|Prepaid expenses and deposits |  |  | 45      |  
|Plant and equipment           |  |  | 1,346   |  
|Intangible assets             |  |  | 7,284   |  
|Accounts payable              |  |  | (1,674  | )
|Total identifiable net assets |  |  | $15,711 |  
|Goodwill                      |  |  | 7,790   |  
|Total consideration           |  |  | $23,501 |  

The revenue and
net loss of Cyntech since acquisition on November 1, 2010 included in the Consolidated Statements of Operations and Comprehensive (Loss) Income for the year ended March 31, 2011 are $7,286 and $(1,588) respectively.

b) Acquisitions in fiscal 2010

On August 1, 2009, the
Company acquired all of the issued and outstanding shares of DF Investments Limited and its subsidiary Drillco Foundation Co. Ltd., a piling company based in Milton, Ontario, for consideration of $5,410. This acquisition gives the Company access to
piling markets and customers in the Toronto area. The transaction was accounted



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 15 | 



---

for using the acquisition method with the results of operations included in the financial statements from the date of acquisition. The goodwill acquired is not deductible for tax purposes. The
recognized amounts of assets acquired and liabilities assumed at the acquisition date are as follows:



|                                         |  |  |        |  
|---------------------------------------- |  |  | ------ | -
|Accounts receivable                      |  |  | $4,101 |  
|Inventories                              |  |  | 59     |  
|Prepaid expenses and deposits            |  |  | 11     |  
|Property, plant and equipment            |  |  | 2,873  |  
|Land                                     |  |  | 281    |  
|Intangible assets                        |  |  | 547    |  
|Accounts payable and accrued liabilities |  |  | (2,211 | )
|Deferred tax liabilities                 |  |  | (838   | )
|Long term debt                           |  |  | (652   | )
|Total identifiable net assets            |  |  | $4,171 |  
|Goodwill                                 |  |  | 1,239  |  
|Total consideration                      |  |  | $5,410 |  

c) Acquisitions
in fiscal 2009

The Company did not acquire any businesses in fiscal 2009.

7. Accounts receivable



|                                             |  |               |          |   |  |  |  |               |  |  |          |  
|-------------------------------------------- |  | ------------- | -------- | - |  |  |  | ------------- |  |  | -------- | -
|                                             |  | March 31,2011 |          |   |  |  |  | March 31,2010 | 
|Accounts receivable  trade                  |  |               | $115,660 |   |  |  |  |               |  |  | $103,311 |  
|Accounts receivable  holdbacks              |  |               | 12,018   |   |  |  |  |               |  |  | 3,899    |  
|Income and other taxes receivable            |  |               | 397      |   |  |  |  |               |  |  | 4,486    |  
|Accounts receivable  other                  |  |               | 437      |   |  |  |  |               |  |  | 1,879    |  
|Allowance for doubtful accounts (note 22(d)) |  |               | (30      | ) |  |  |  |               |  |  | (1,691   | )
|                                             |  |               | $128,482 |   |  |  |  |               |  |  | $111,884 |  

Accounts
receivable  holdbacks represent amounts up to 10% under certain contracts that the customer is contractually entitled to withhold until completion of the project or until certain project milestones are achieved. Holdbacks include $587 as of
March 31, 2011 (March 31, 2010$727) which relate to contracts whereby the normal operating cycle is greater than one year and therefore are not expected to be collected within a year.

8. Costs incurred and estimated earnings net of billings on uncompleted contracts



|                                                               |  |               |          |   |  |  |  |               |  |  |            |  
|-------------------------------------------------------------- |  | ------------- | -------- | - |  |  |  | ------------- |  |  | ---------- | -
|                                                               |  | March 31,2011 |          |   |  |  |  | March 31,2010 | 
|Costs incurred and estimated earnings on uncompleted contracts |  |               | $946,482 |   |  |  |  |               |  |  | $1,193,821 |  
|Less billings to date                                          |  |               | (845,547 | ) |  |  |  |               |  |  | (1,110,733 | )
|                                                               |  |               | $100,935 |   |  |  |  |               |  |  | $83,088    |  

Costs incurred and
estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:



|                                                                                     |  |               |          |   |  |  |  |               |  |  |         |  
|------------------------------------------------------------------------------------ |  | ------------- | -------- | - |  |  |  | ------------- |  |  | ------- | -
|                                                                                     |  | March 31,2011 |          |   |  |  |  | March 31,2010 | 
|Unbilled revenue                                                                     |  |               | $102,939 |   |  |  |  |               |  |  | $84,702 |  
|Billings in excess of costs incurred and estimated earnings on uncompleted
contracts |  |               | (2,004   | ) |  |  |  |               |  |  | (1,614  | )
|                                                                                     |  |               | $100,935 |   |  |  |  |               |  |  | $83,088 |  

An amount of
$72,025 is recognized within unbilled revenue relating to a single long-term customer contract, whereby the normal operating cycle for this project is greater than one year. As described in Note 2(b) the estimated balances within unbilled revenue
are subject to uncertainty concerning ultimate realization.

9. Inventories



|                            |  |               |        |  |  |  |  |               |  |  |        | 
|--------------------------- |  | ------------- | ------ |  |  |  |  | ------------- |  |  | ------ | 
|                            |  | March 31,2011 |        |  |  |  |  | March 31,2010 | 
|Spare tires                 |  |               | $3,794 |  |  |  |  |               |  |  | $1,868 | 
|Job materials               |  |               | 2,118  |  |  |  |  |               |  |  | 1,179  | 
|Manufacturing raw materials |  |               | 926    |  |  |  |  |               |  |  |       | 
|Finished goods              |  |               | 897    |  |  |  |  |               |  |  |       | 
|                            |  |               | $7,735 |  |  |  |  |               |  |  | $3,047 | 



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|16 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



10. Prepaid expenses and deposits



|                                     |  |               |        |  |  |  |  |               |  |  |        | 
|------------------------------------ |  | ------------- | ------ |  |  |  |  | ------------- |  |  | ------ | 
|Current:                             |  |               |        |  |  |  |  |               |  |  |        | 
|                                     |  | March 31,2011 |        |  |  |  |  | March 31,2010 | 
|Prepaid insurance and property taxes |  |               | $1,022 |  |  |  |  |               |  |  | $920   | 
|Prepaid lease payments               |  |               | 6,203  |  |  |  |  |               |  |  | 5,678  | 
|Prepaid interest                     |  |               | 1,044  |  |  |  |  |               |  |  | 283    | 
|                                     |  |               | $8,269 |  |  |  |  |               |  |  | $6,881 | 
|Long term:                           |  |               |        |  |  |  |  |               |  |  |        | 
|                                     |  | March 31,2011 |        |  |  |  |  | March 31,2010 | 
|Prepaid lease payments (note 12(a))  |  |               | $2,354 |  |  |  |  |               |  |  | $4,005 | 

11. Investment
in and advances to unconsolidated joint venture

The Company was engaged in a joint venture, Noramac Joint Venture (JV), of which the Company had
joint control (50% proportionate interest). The JV was formed for the purpose of expanding the Companys market opportunities and establishing strategic alliances in Northern Alberta. The Company owned a 49% interest in Noramac Ventures Inc., a
nominee company established by the two joint venture partners. On March 25, 2011, the Company and its joint venture partner decided to wind up Noramac Ventures Inc. and terminate the joint venture. At March 31, 2011, the assets and
liabilities of the joint venture are stated at the lower of carrying value and fair market value less costs to sell. The difference between carrying value and fair market value of assets and liabilities was recognized in the income statement of the
joint venture during the year ended March 31, 2011.

As of March 31, 2011, the Companys investment in and advances to the unconsolidated
joint venture totalled $1,488 (2010  $2,917; 2009  $nil). The condensed financial data for investment in and advances to unconsolidated joint venture is summarized as follows:



|                      |  |               |        |  |  |  |  |               |  |  |        | 
|--------------------- |  | ------------- | ------ |  |  |  |  | ------------- |  |  | ------ | 
|                      |  | March 31,2011 |        |  |  |  |  | March 31,2010 | 
|Current assets        |  |               | $8,328 |  |  |  |  |               |  |  | $8,952 | 
|Long term assets      |  |               |       |  |  |  |  |               |  |  | 153    | 
|Current liabilities   |  |               | 13,875 |  |  |  |  |               |  |  | 3,271  | 
|Long term liabilities |  |               |       |  |  |  |  |               |  |  | 5,940  | 



|                                                          |  |      |         |  |  |  |  |      |  |  |        |  
|--------------------------------------------------------- |  | ---- | ------- |  |  |  |  | ---- |  |  | ------ | -
|Year ended March 31,                                      |  | 2011 |         |  |  |  |  | 2010 | 
|Gross revenues                                            |  |      | $12,196 |  |  |  |  |      |  |  | $8,774 |  
|Gross loss (profit)                                       |  |      | 2,483   |  |  |  |  |      |  |  | (1,610 | )
|Net loss (income)                                         |  |      | 5,440   |  |  |  |  |      |  |  | (87    | )
|Equity in loss (earnings) of unconsolidated joint venture |  |      | $2,720  |  |  |  |  |      |  |  | $(44   | )

12. Other assets

a) Other assets are as follows:



|                                                                     |  |               |         |  |  |  |  |               |  |  |         | 
|-------------------------------------------------------------------- |  | ------------- | ------- |  |  |  |  | ------------- |  |  | ------- | 
|                                                                     |  | March 31,2011 |         |  |  |  |  | March 31,2010 | 
|Prepaid lease payments (note 10)                                     |  |               | $2,354  |  |  |  |  |               |  |  | $4,005  | 
|Assets held for sale (note 12(b))                                    |  |               | 721     |  |  |  |  |               |  |  | 838     | 
|Intangible assets (note 12(c))                                       |  |               | 16,161  |  |  |  |  |               |  |  | 7,669   | 
|Deferred financing costs (note 12(d))                                |  |               | 7,672   |  |  |  |  |               |  |  | 6,725   | 
|Investment in and advances to unconsolidated joint venture (note 11) |  |               |        |  |  |  |  |               |  |  | 2,917   | 
|                                                                     |  |               | $26,908 |  |  |  |  |               |  |  | $22,154 | 

b) Assets held
for sale

Equipment disposal decisions are made using an approach in which a target life is set for each type of equipment. The target life is based
on the manufacturers recommendations and the Companys past experience in the various operating environments. Once a piece of equipment reaches its target life it is evaluated to determine if disposal is warranted based on its expected
operating cost and reliability in its current state. If the expected operating cost exceeds the average operating cost for the fleet, the unit is deemed ready for disposal. Also, if the expected reliability is lower than the average reliability of
the fleet, the unit is deemed ready for disposal. If either of these conditions is met the unit is disposed. Expected operating costs and reliability are based on the past history of the unit and experience in the various operating environments.
Assets held for sale are sold on the Companys used equipment website and syndicated on third party equipment sale websites. If a sale is not realized after a reasonable length of time, the equipment will be sent to auction for disposal.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 17 | 



---

During the year ended March 31, 2011, impairments of assets held for sale amounting to $141 have been included in
depreciation expense in the Consolidated Statements of Operations (2010  $806; 2009  $883). The impairment charge is the amount by which the carrying value of the related assets exceeded their fair value less costs to sell. Loss on
disposal of assets held for sale was $825 for the year ended March 31, 2011 (2010  $373; 2009  $24).

c) Intangible assets



|                                   |  |      |         |  |  |  |  |                         |  |  |        |  |  |                |  |  |  |  |         | 
|---------------------------------- |  | ---- | ------- |  |  |  |  | ----------------------- |  |  | ------ |  |  | -------------- |  |  |  |  | ------- | 
|March 31, 2011                     |  | Cost |         |  |  |  |  | AccumulatedAmortization |  |  |        |  |  | Net Book Value | 
|Customer relationships and backlog |  |      | $4,442  |  |  |  |  |                         |  |  | $755   |  |  |                |  |  |  |  | $3,687  | 
|Other intangible assets            |  |      | 2,364   |  |  |  |  |                         |  |  | 779    |  |  |                |  |  |  |  | 1,585   | 
|Internal-use software              |  |      | 15,469  |  |  |  |  |                         |  |  | 6,441  |  |  |                |  |  |  |  | 9,028   | 
|Patents                            |  |      | 2,017   |  |  |  |  |                         |  |  | 156    |  |  |                |  |  |  |  | 1,861   | 
|                                   |  |      | $24,292 |  |  |  |  |                         |  |  | $8,131 |  |  |                |  |  |  |  | $16,161 | 



|                                                         |  |      |         |  |  |  |  |                         |  |  |        |  |  |                |  |  |  |  |        | 
|-------------------------------------------------------- |  | ---- | ------- |  |  |  |  | ----------------------- |  |  | ------ |  |  | -------------- |  |  |  |  | ------ | 
|March 31, 2010                                           |  | Cost |         |  |  |  |  | AccumulatedAmortization |  |  |        |  |  | Net Book Value | 
|Customer contracts in progress and related relationships |  |      | $624    |  |  |  |  |                         |  |  | $329   |  |  |                |  |  |  |  | $295   | 
|Other intangible assets                                  |  |      | 915     |  |  |  |  |                         |  |  | 531    |  |  |                |  |  |  |  | 384    | 
|Internal-use software                                    |  |      | 10,721  |  |  |  |  |                         |  |  | 3,731  |  |  |                |  |  |  |  | 6,990  | 
|                                                         |  |      | $12,260 |  |  |  |  |                         |  |  | $4,591 |  |  |                |  |  |  |  | $7,669 | 

During the year
ended March 31, 2011, the Company capitalized $4,748 (2010  $3,362) related to internally developed computer software. There was no write off of internal-use software included in amortization of intangible assets during the year ended
March 31, 2011 (2010  $208; 2009  $nil).

Amortization of intangible assets for the year ended March 31, 2011 was $3,540 (2010
 $1,719; 2009  $1,501). The estimated amortization expense for future years is as follows:



|                              |  |  |         | 
|----------------------------- |  |  | ------- | 
|For the year ending March 31, |  |  |         | 
|2012                          |  |  | $4,576  | 
|2013                          |  |  | 4,217   | 
|2014                          |  |  | 3,564   | 
|2015                          |  |  | 2,039   | 
|2016 and thereafter           |  |  | 1,765   | 
|                              |  |  | $16,161 | 

During the year
ended March 31, 2011, $7,284 in additions, summarized in the table below, were made to intangible assets as a result of the acquisition of the assets of Cyntech Corporation and its wholly-owned subsidiary Cyntech Anchor Systems LLC (note 6(a)).



|                       |  |  |        | 
|---------------------- |  |  | ------ | 
|Patents                |  |  | $2,017 | 
|Customer relationships |  |  | 3,818  | 
|Non-compete agreements |  |  | 592    | 
|Cyntech brand name     |  |  | 857    | 
|                       |  |  | $7,284 | 

During the year
ended March 31, 2010, $547 in additions were made to intangible assets as a result of the acquisition of DF Investments Limited and its subsidiary, Drillco Foundation Co. Ltd. (note 6(b)).

d) Deferred financing costs



|                              |  |      |         |  |  |  |  |                         |  |  |         |  |  |                |  |  |  |  |        | 
|----------------------------- |  | ---- | ------- |  |  |  |  | ----------------------- |  |  | ------- |  |  | -------------- |  |  |  |  | ------ | 
|March 31, 2011                |  | Cost |         |  |  |  |  | AccumulatedAmortization |  |  |         |  |  | Net Book Value | 
|83/4% senior notes            |  |      | $16,521 |  |  |  |  |                         |  |  | $16,521 |  |  |                |  |  |  |  | $     | 
|Term and revolving facilities |  |      | 5,362   |  |  |  |  |                         |  |  | 3,855   |  |  |                |  |  |  |  | 1,507  | 
|Series 1 Debentures           |  |      | 6,886   |  |  |  |  |                         |  |  | 721     |  |  |                |  |  |  |  | 6,165  | 
|                              |  |      | $28,769 |  |  |  |  |                         |  |  | $21,097 |  |  |                |  |  |  |  | $7,672 | 



|                              |  |      |         |  |  |  |  |                         |  |  |         |  |  |                |  |  |  |  |        | 
|----------------------------- |  | ---- | ------- |  |  |  |  | ----------------------- |  |  | ------- |  |  | -------------- |  |  |  |  | ------ | 
|March 31, 2010                |  | Cost |         |  |  |  |  | AccumulatedAmortization |  |  |         |  |  | Net Book Value | 
|83/4% senior notes            |  |      | $16,521 |  |  |  |  |                         |  |  | $12,014 |  |  |                |  |  |  |  | $4,507 | 
|Term and revolving facilities |  |      | 4,328   |  |  |  |  |                         |  |  | 3,150   |  |  |                |  |  |  |  | 1,178  | 
|Series 1 Debentures           |  |      | 1,040   |  |  |  |  |                         |  |  |        |  |  |                |  |  |  |  | 1,040  | 
|                              |  |      | $21,889 |  |  |  |  |                         |  |  | $15,164 |  |  |                |  |  |  |  | $6,725 | 



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|18 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



Amortization of deferred financing costs included in interest expense for the year ended March 31, 2011 was $1,609 (2010  $3,348; 2009  $2,970).

Upon redemption of the 83/4% senior notes on April 28, 2010, the unamortized deferred financing costs related to the 83/4% senior notes of $4,324 were expensed and included in the loss on debt
extinguishment (note 16(c)). In addition, $183 related to amortization of deferred financing costs incurred up to the redemption date was included in interest expense.

During the year ended March 31, 2011, financing fees of $5,846 were incurred in connection with the issuance of the Series 1 Debentures (2010  $1,040) (note 16(d)) and financing fees of $1,034 were
incurred in connection with the modifications made to the amended and restated credit agreement (2010  $1,123; 2009  $nil) (note 16(b)).

13. Property, plant and equipment



|                              |  |      |          |  |  |  |  |                        |  |  |          |  |  |               |  |  |  |  |          | 
|----------------------------- |  | ---- | -------- |  |  |  |  | ---------------------- |  |  | -------- |  |  | ------------- |  |  |  |  | -------- | 
|March 31, 2011                |  | Cost |          |  |  |  |  | AccumulatedDeprecation |  |  |          |  |  | Net BookValue | 
|Heavy equipment               |  |      | $341,734 |  |  |  |  |                        |  |  | $108,051 |  |  |               |  |  |  |  | $233,683 | 
|Major component parts in use  |  |      | 47,248   |  |  |  |  |                        |  |  | 15,593   |  |  |               |  |  |  |  | 31,655   | 
|Other equipment               |  |      | 31,877   |  |  |  |  |                        |  |  | 14,136   |  |  |               |  |  |  |  | 17,741   | 
|Licensed motor vehicles       |  |      | 21,368   |  |  |  |  |                        |  |  | 16,592   |  |  |               |  |  |  |  | 4,776    | 
|Office and computer equipment |  |      | 12,128   |  |  |  |  |                        |  |  | 5,899    |  |  |               |  |  |  |  | 6,229    | 
|Buildings                     |  |      | 21,657   |  |  |  |  |                        |  |  | 8,176    |  |  |               |  |  |  |  | 13,481   | 
|Land                          |  |      | 281      |  |  |  |  |                        |  |  |         |  |  |               |  |  |  |  | 281      | 
|Leasehold improvements        |  |      | 9,422    |  |  |  |  |                        |  |  | 3,856    |  |  |               |  |  |  |  | 5,566    | 
|Assets under capital lease    |  |      | 19,506   |  |  |  |  |                        |  |  | 11,054   |  |  |               |  |  |  |  | 8,452    | 
|                              |  |      | $505,221 |  |  |  |  |                        |  |  | $183,357 |  |  |               |  |  |  |  | $321,864 | 



|                              |  |      |          |  |  |  |  |                        |  |  |          |  |  |               |  |  |  |  |          | 
|----------------------------- |  | ---- | -------- |  |  |  |  | ---------------------- |  |  | -------- |  |  | ------------- |  |  |  |  | -------- | 
|March 31, 2010                |  | Cost |          |  |  |  |  | AccumulatedDeprecation |  |  |          |  |  | Net BookValue | 
|Heavy equipment               |  |      | $339,312 |  |  |  |  |                        |  |  | $95,473  |  |  |               |  |  |  |  | $243,839 | 
|Major component parts in use  |  |      | 36,064   |  |  |  |  |                        |  |  | 8,297    |  |  |               |  |  |  |  | 27,767   | 
|Other equipment               |  |      | 25,666   |  |  |  |  |                        |  |  | 10,910   |  |  |               |  |  |  |  | 14,756   | 
|Licensed motor vehicles       |  |      | 16,296   |  |  |  |  |                        |  |  | 10,692   |  |  |               |  |  |  |  | 5,604    | 
|Office and computer equipment |  |      | 9,746    |  |  |  |  |                        |  |  | 3,786    |  |  |               |  |  |  |  | 5,960    | 
|Buildings                     |  |      | 21,710   |  |  |  |  |                        |  |  | 6,832    |  |  |               |  |  |  |  | 14,878   | 
|Land                          |  |      | 281      |  |  |  |  |                        |  |  |         |  |  |               |  |  |  |  | 281      | 
|Leasehold improvements        |  |      | 9,314    |  |  |  |  |                        |  |  | 2,960    |  |  |               |  |  |  |  | 6,354    | 
|Assets under capital lease    |  |      | 24,304   |  |  |  |  |                        |  |  | 12,388   |  |  |               |  |  |  |  | 11,916   | 
|                              |  |      | $482,693 |  |  |  |  |                        |  |  | $151,338 |  |  |               |  |  |  |  | $331,355 | 

Assets under
capital lease are comprised predominately of licensed motor vehicles.

During the year ended March 31, 2011, additions to property, plant and
equipment included $427 of assets that were acquired by means of capital leases (2010  $1,523; 2009  $8,863). Depreciation of equipment under capital lease of $2,723 (2010  $4,081; 2009  $5,138) was included in depreciation
expense.

14. Accrued liabilities



|                                        |  |               |         |  |  |  |  |               |  |  |         | 
|--------------------------------------- |  | ------------- | ------- |  |  |  |  | ------------- |  |  | ------- | 
|                                        |  | March 31,2011 |         |  |  |  |  | March 31,2010 | 
|Accrued interest payable                |  |               | $9,866  |  |  |  |  |               |  |  | $14,725 | 
|Payroll liabilities                     |  |               | 11,412  |  |  |  |  |               |  |  | 21,741  | 
|Liabilities related to equipment leases |  |               | 7,518   |  |  |  |  |               |  |  | 4,720   | 
|Income and other taxes payable          |  |               | 4,018   |  |  |  |  |               |  |  | 6,005   | 
|                                        |  |               | $32,814 |  |  |  |  |               |  |  | $47,191 | 



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 19 | 



---

15. Capital lease obligations

The Companys capital leases primarily relate to licensed motor vehicles. The minimum lease payments due in each of the next five fiscal years are as follows:



|                                                                            |  |  |        |  
|--------------------------------------------------------------------------- |  |  | ------ | -
|2012                                                                        |  |  | $5,267 |  
|2013                                                                        |  |  | 3,087  |  
|2014                                                                        |  |  | 562    |  
|2015                                                                        |  |  | 270    |  
|2016                                                                        |  |  | 71     |  
|Subtotal:                                                                   |  |  | $9,257 |  
|Less: amount representing interest  weighted average interest rate of 6.5% |  |  | (564   | )
|Present value of minimum lease payments                                     |  |  | $8,693 |  
|Less: current portion                                                       |  |  | (4,862 | )
|Long term portion                                                           |  |  | $3,831 |  

16. Long term
debt

a) Long term debt are as follows:



|                                 |  |               |          |  |  |  |  |               |  |  |          | 
|-------------------------------- |  | ------------- | -------- |  |  |  |  | ------------- |  |  | -------- | 
|                                 |  | March 31,2011 |          |  |  |  |  | March 31,2010 | 
|Credit facilities (note 16(b))   |  |               | $61,970  |  |  |  |  |               |  |  | $22,374  | 
|83/4% senior notes (note 16(c))  |  |               |         |  |  |  |  |               |  |  | 203,120  | 
|Series 1 Debentures (note 16(d)) |  |               | 225,000  |  |  |  |  |               |  |  |         | 
|                                 |  |               | $286,970 |  |  |  |  |               |  |  | $225,494 | 

b) Credit
Facilities



|                                         |  |               |         |   |  |  |  |               |  |  |         |  
|---------------------------------------- |  | ------------- | ------- | - |  |  |  | ------------- |  |  | ------- | -
|                                         |  | March 31,2011 |         |   |  |  |  | March 31,2010 | 
|Term A Facility                          |  |               | $24,698 |   |  |  |  |               |  |  | $28,446 |  
|Term B Facility                          |  |               | 43,748  |   |  |  |  |               |  |  |        |  
|Revolving Facility                       |  |               | 3,524   |   |  |  |  |               |  |  |        |  
|Total credit facilities                  |  |               | $71,970 |   |  |  |  |               |  |  | $28,446 |  
|Less: current portion of term facilities |  |               | (10,000 | ) |  |  |  |               |  |  | (6,072  | )
|                                         |  |               | $61,970 |   |  |  |  |               |  |  | $22,374 |  

On April 30,
2010, the Company entered into an amended and restated credit agreement to extend the term of the credit facilities and increase the amount of the term loans. These facilities mature on April 30, 2013.

The new credit facilities include an $85.0 million Revolving Facility (previously $90.0 million), a $28.4 million Term A Facility and a $50.0 million Term B
Facility. Advances under the Revolving Facility may be repaid from time to time at the Companys option. The term facilities include scheduled repayments totalling $10.0 million per year with $2.5 million paid on the last day of each quarter
commencing June 30, 2010. In addition, the Company must make annual payments within 120 days of the end of its fiscal year in the amount of 50% of Consolidated Excess Cash Flow (as defined in the credit agreement) to a maximum of $4.0 million.
The Company will not be required to make an additional principal payment in July 2011 related to the 2011 fiscal year.

As of March 31, 2011, the
Company had outstanding borrowings of $68.4 million (March 31, 2010  $28.4 million) under the term facilities, $3.5 million (March 31, 2010$nil) under the Revolving Facility and had issued $12.3 million (March 31, 2010  $10.4
million) in letters of credit under the Revolving Facility to support performance guarantees associated with customer contracts. The funds available for borrowing under the Revolving Facility are reduced by any outstanding letters of credit. The
Companys unused borrowing availability under the Revolving Facility was $69.2 million at March 31, 2011.

During the year ended March 31,
2011, financing fees of $1,034 were incurred in connection with the modifications made to the amended and restated credit agreement (2010  $1,123; 2009  $nil). These fees have been recorded as deferred financing costs and are being
amortized using the effective interest method over the term of the credit agreement (note 12(d)).

Interest on Canadian prime rate loans is paid at
variable rates based on the Canadian prime rate plus the applicable pricing margin (as defined in the credit agreement). Interest on US base rate loans is paid at a rate per annum equal to the US base rate plus the applicable pricing margin.
Interest on Canadian prime rate and US base rate loans is payable monthly in arrears and computed on the basis of a 365 day or 366 day year, as the case may be. Interest on LIBOR loans is paid during each interest period at a rate per annum,
calculated on a 360 day year, equal to the LIBOR rate with respect to such interest period plus the applicable pricing margin. Stamping fees and interest related to the issuance of Bankers Acceptances is paid in advance upon the issuance of
such Bankers Acceptance. The weighted average interest rate on Revolving Facility and Term Facility borrowings at March 31, 2011 was 5.87%.



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|20 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The credit facilities are secured by a first priority lien on substantially all of the Companys existing and after-acquired property and contain certain
restrictive covenants including, but not limited to, incurring additional debt, transferring or selling assets, making investments including acquisitions, paying dividends or redeeming shares of capital stock. The Company is also required to meet
certain financial covenants under the credit agreement and is expected to remain in compliance throughout the fiscal year ending March 31, 2012. As at March 31, 2011, the Company was in violation of certain financial covenants as defined
within the credit agreement. On May 20, 2011, the Company obtained an amendment in connection with such covenants from its lenders resulting in compliance as at March 31, 2011. The Company considers it probable that they will be in
compliance with these covenants throughout the fiscal year ending March 31, 2012.

c) 83/4% Senior Notes



|                                            |  |               |    |  |  |  |  |               |  |  |          | 
|------------------------------------------- |  | ------------- | -- |  |  |  |  | ------------- |  |  | -------- | 
|                                            |  | March 31,2011 |    |  |  |  |  | March 31,2010 | 
|83/4% senior unsecured notes due 2011 ($US) |  |               | $ |  |  |  |  |               |  |  | $200,000 | 
|Unrealized foreign exchange                 |  |               |   |  |  |  |  |               |  |  | 3,120    | 
|                                            |  |               | $ |  |  |  |  |               |  |  | $203,120 | 

The
83/4% senior notes were issued on November 26, 2003 in
the amount of US $200.0 million (Canadian $263.0 million).

On April 28, 2010, the Company redeemed the 83/4% senior notes for $202,410 and recorded a $4,346 loss on debt extinguishment
including a $4,324 write off of deferred financing costs (note 12(d)).

d) Series 1 Debentures

On April 7, 2010, the Company issued $225.0 million of 9.125% Series 1 Debentures (the Series 1 Debentures). The Series 1 Debentures mature on
April 7, 2017. The Series 1 Debentures bear interest at 9.125% per annum and such interest is payable in equal instalments semi-annually in arrears on April 7 and October 7 in each year, commencing on October 7, 2010.

The Series 1 Debentures are unsecured senior obligations and rank equally with all other existing and future unsecured senior debt and senior to any
subordinated debt that may be issued by the Company or any of its subsidiaries. The Series 1 Debentures are effectively subordinated to all secured debt to the extent of collateral on such debt.

At any time prior to April 7, 2013, the Company may redeem up to 35% of the aggregate principal amount of the Series 1 Debentures with the net cash proceeds of
one or more public equity offerings at a redemption price equal to 109.125% of the principal amount, plus accrued and unpaid interest to the date of redemption, so long as:



| | i) | at least 65% of the original aggregate amount of the Series 1 Debentures remains outstanding after each redemption; and
| | -- | -----------------------------------------------------------------------------------------------------------------------



| | ii) | any redemption by the Company is made within 90 days of the equity offering.
| | --- | ----------------------------------------------------------------------------

At any time prior to April 7, 2013, the Company may on one or more occasions redeem the Series 1 Debentures, in whole or in part, at a redemption price which is equal to the greater of (a) the Canada
Yield Price (as defined in the trust indenture) and (b) 100% of the aggregate principal amount of Series 1 Debentures redeemed, plus, in each case, accrued and unpaid interest to the redemption date (subject to the right of holders of record on
the relevant record date to receive interest due on the relevant interest payment date).

The Series 1 Debentures are redeemable at the option of the
Company, in whole or in part, at any time on or after: April 7, 2013 at 104.563% of the principal amount; April 7, 2014 at 103.042% of the principal amount; April 7, 2015 at 101.520% of the principal amount; April 7, 2016 and
thereafter at 100% of the principal amount; plus, in each case, interest accrued to the redemption date.

If a change of control occurs, the Company will
be required to offer to purchase all or a portion of each debenture holders Series 1 Debentures, at a purchase price in cash equal to 101% of the principal amount of the Series 1 Debentures offered for repurchase plus accrued interest to the
date of purchase.

During the year ended March 31, 2011, financing fees of $5,846 were incurred in connection with the issuance of the Series 1
Debentures in addition to $1,040 that was incurred in March 2010. These fees have been recorded as deferred financing costs and are being amortized using the effective interest method over the term of the Series 1 Debentures (note 12(d)).



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 21 | 



---

17. Other long term obligations

a) Other long term obligations are as follows:



|                                                             |  |               |         |  |  |  |  |               |  |  |         | 
|------------------------------------------------------------ |  | ------------- | ------- |  |  |  |  | ------------- |  |  | ------- | 
|                                                             |  | March 31,2011 |         |  |  |  |  | March 31,2010 | 
|Long term portion of liabilities related to equipment leases |  |               | $12,747 |  |  |  |  |               |  |  | $14,943 | 
|Deferred lease inducements (note 17(b))                      |  |               | 654     |  |  |  |  |               |  |  | 761     | 
|Asset retirement obligation (note 17(c))                     |  |               | 395     |  |  |  |  |               |  |  | 360     | 
|Senior executive stock option plan (note 28(c))              |  |               | 5,115   |  |  |  |  |               |  |  |        | 
|Restricted share unit plan (note 28(e))                      |  |               | 2,633   |  |  |  |  |               |  |  | 1,030   | 
|Directors deferred stock unit plan (note 28(f))             |  |               | 4,032   |  |  |  |  |               |  |  | 2,548   | 
|                                                             |  |               | $25,576 |  |  |  |  |               |  |  | $19,642 | 

b) Deferred
lease inducements

Lease inducements applicable to lease contracts are deferred and amortized as a reduction of general and administrative expenses
on a straight-line basis over the lease term, which includes the initial lease term and renewal periods only where renewal is determined to be reasonably assured.



|                                           |  |               |      |   |  |  |  |               |  |  |      |  
|------------------------------------------ |  | ------------- | ---- | - |  |  |  | ------------- |  |  | ---- | -
|                                           |  | March 31,2011 |      |   |  |  |  | March 31,2010 | 
|Balance, beginning of year                 |  |               | $761 |   |  |  |  |               |  |  | $836 |  
|Additions                                  |  |               |     |   |  |  |  |               |  |  | 32   |  
|Amortization of deferred lease inducements |  |               | (107 | ) |  |  |  |               |  |  | (107 | )
|Balance, end of year                       |  |               | $654 |   |  |  |  |               |  |  | $761 |  

c) Asset
retirement obligation

The Company recorded an asset retirement obligation related to the future retirement of a facility on leased land. Accretion
expense associated with this obligation is included in equipment costs in the Consolidated Statements of Operations.

The following table presents a
continuity of the liability for the asset retirement obligation:



|                                              |  |               |      |  |  |  |  |               |  |  |      |  
|--------------------------------------------- |  | ------------- | ---- |  |  |  |  | ------------- |  |  | ---- | -
|                                              |  | March 31,2011 |      |  |  |  |  | March 31,2010 | 
|Balance, beginning of year                    |  |               | $360 |  |  |  |  |               |  |  | $386 |  
|Change in the present value of the obligation |  |               |     |  |  |  |  |               |  |  | (31  | )
|Accretion expense                             |  |               | 35   |  |  |  |  |               |  |  | 5    |  
|Balance, end of year                          |  |               | $395 |  |  |  |  |               |  |  | $360 |  

At March 31,
2011, estimated undiscounted cash flows required to settle the obligation were $1,084 (March 31, 2010  $1,084). The credit adjusted risk-free rate assumed in measuring the asset retirement obligation was 9.42%. The Company expects to settle
this obligation in 2021.



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|22 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



18. Income taxes

Income tax provision (benefit) differs from
the amount that would be computed by applying the Federal and Provincial statutory income tax rates to income before income taxes. The reasons for the differences are as follows:



|                                                     |  |      |          |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |           |  
|---------------------------------------------------- |  | ---- | -------- | - |  |  |  | ---- |  |  | ------- | - |  | ---- |  |  |  |  | --------- | -
|Year ended March 31,                                 |  | 2011 |          |   |  |  |  | 2010 |  |  |         |   |  | 2009 | 
|(Loss) income before income taxes statutory tax rate |  |      | $(41,098 | ) |  |  |  |      |  |  | $41,898 |   |  |      |  |  |  |  | $(120,771 | )
|Tax rate                                             |  |      | 27.75%   |   |  |  |  |      |  |  | 28.91%  |   |  |      |  |  |  |  | 29.38%    |  
|Expected provision (benefit) at statutory tax rate   |  |      | $(11,405 | ) |  |  |  |      |  |  | $12,113 |   |  |      |  |  |  |  | $(35,483  | )
|Increase (decrease) related to:                      |  |      |          |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |           |  
|Impact of enacted future statutory income tax rates  |  |      | 164      |   |  |  |  |      |  |  | (673    | ) |  |      |  |  |  |  | (1,005    | )
|Income tax adjustments and reassessments             |  |      | 909      |   |  |  |  |      |  |  | 1,442   |   |  |      |  |  |  |  |          |  
|Valuation allowance                                  |  |      | 962      |   |  |  |  |      |  |  |        |   |  |      |  |  |  |  |          |  
|Impairment of goodwill                               |  |      |         |   |  |  |  |      |  |  |        |   |  |      |  |  |  |  | 51,767    |  
|Stock-based compensation                             |  |      | 1,443    |   |  |  |  |      |  |  | 617     |   |  |      |  |  |  |  | 555       |  
|Non deductible portion of capital losses             |  |      | 1,063    |   |  |  |  |      |  |  |        |   |  |      |  |  |  |  |          |  
|Other                                                |  |      | 416      |   |  |  |  |      |  |  | 180     |   |  |      |  |  |  |  | (1,201    | )
|Income tax provision                                 |  |      | $(6,448  | ) |  |  |  |      |  |  | $13,679 |   |  |      |  |  |  |  | $14,633   |  

Classified as:



|                      |  |      |         |   |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|--------------------- |  | ---- | ------- | - |  |  |  | ---- |  |  | ------- |  |  | ---- |  |  |  |  | ------- | 
|                      |  | 2011 |         |   |  |  |  | 2010 |  |  |         |  |  | 2009 | 
|Year ended March 31,  |  |      |         |   |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|Current income taxes  |  |      | $2,892  |   |  |  |  |      |  |  | $3,803  |  |  |      |  |  |  |  | $5,546  | 
|Deferred income taxes |  |      | (9,340  | ) |  |  |  |      |  |  | 9,876   |  |  |      |  |  |  |  | 9,087   | 
|                      |  |      | $(6,448 | ) |  |  |  |      |  |  | $13,679 |  |  |      |  |  |  |  | $14,633 | 



|                                                             |  |               |         |  |  |  |  |               |  |  |         | 
|------------------------------------------------------------ |  | ------------- | ------- |  |  |  |  | ------------- |  |  | ------- | 
|                                                             |  | March 31,2011 |         |  |  |  |  | March 31,2010 | 
|Deferred tax assets:                                         |  |               |         |  |  |  |  |               |  |  |         | 
|Non-capital losses carried forward                           |  |               | $41,581 |  |  |  |  |               |  |  | $2,205  | 
|Deferred financing costs                                     |  |               |        |  |  |  |  |               |  |  | 12      | 
|Derivative financial instruments and
83/4% senior notes      |  |               | 2,895   |  |  |  |  |               |  |  | 8,892   | 
|Billings in excess of costs on uncompleted contracts         |  |               | 508     |  |  |  |  |               |  |  | 448     | 
|Capital lease obligations                                    |  |               | 2,247   |  |  |  |  |               |  |  | 3,692   | 
|Intangible assets                                            |  |               | 473     |  |  |  |  |               |  |  | 104     | 
|Long term portion of liabilities related to equipment leases |  |               | 2,029   |  |  |  |  |               |  |  | 1,965   | 
|Deferred lease inducements                                   |  |               | 161     |  |  |  |  |               |  |  | 199     | 
|Stock-based compensation                                     |  |               | 1,656   |  |  |  |  |               |  |  | 894     | 
|Other                                                        |  |               | 99      |  |  |  |  |               |  |  | 370     | 
|                                                             |  |               | $51,649 |  |  |  |  |               |  |  | $18,781 | 



|                                                                         |  |               |          |   |  |  |  |               |  |  |          |  
|------------------------------------------------------------------------ |  | ------------- | -------- | - |  |  |  | ------------- |  |  | -------- | -
|                                                                         |  | March 31,2011 |          |   |  |  |  | March 31,2010 | 
|Deferred tax liabilities:                                                |  |               |          |   |  |  |  |               |  |  |          |  
|Unbilled revenue and uncertified revenue included in accounts receivable |  |               | $24,418  |   |  |  |  |               |  |  | $15,975  |  
|Assets held for sale                                                     |  |               | 189      |   |  |  |  |               |  |  | 233      |  
|Accounts receivable  holdbacks                                          |  |               | 3,154    |   |  |  |  |               |  |  | 1,083    |  
|Property, plant and equipment                                            |  |               | 44,105   |   |  |  |  |               |  |  | 31,234   |  
|Deferred financing costs                                                 |  |               | 71       |   |  |  |  |               |  |  |         |  
|Intangible assets                                                        |  |               | 76       |   |  |  |  |               |  |  |         |  
|Other                                                                    |  |               | 40       |   |  |  |  |               |  |  |         |  
|                                                                         |  |               | 72,053   |   |  |  |  |               |  |  | 48,525   |  
|Net deferred income taxes                                                |  |               | $(20,404 | ) |  |  |  |               |  |  | $(29,744 | )

Classified as:



|                    |  |               |          |   |  |  |  |               |  |  |          |  
|------------------- |  | ------------- | -------- | - |  |  |  | ------------- |  |  | -------- | -
|                    |  | March 31,2011 |          |   |  |  |  | March 31,2010 | 
|Current asset       |  |               | $1,729   |   |  |  |  |               |  |  | $3,481   |  
|Long term asset     |  |               | 49,920   |   |  |  |  |               |  |  | 15,300   |  
|Current liability   |  |               | (27,612  | ) |  |  |  |               |  |  | (16,781  | )
|Long term liability |  |               | (44,441  | ) |  |  |  |               |  |  | (31,744  | )
|                    |  |               | $(20,404 | ) |  |  |  |               |  |  | $(29,744 | )



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 23 | 



---

The Company and its subsidiaries file income tax returns in the Canadian federal jurisdiction, five provincial
jurisdictions and US federal and Texas state jurisdiction. For years before 2007, the Company is no longer subject to Canadian federal or provincial examinations.

The Company had unrecognized tax benefits in capital losses of $962 as at March 31, 2011 (2010  $nil; 2009  $nil). At March 31, 2011, the Company has non-capital losses for income tax purposes
of $164,661 which predominately expire after 2027.



|     |  |               |          | 
|---- |  | ------------- | -------- | 
|     |  | March 31,2011 |         
|2027 |  |               | $2,968   | 
|2028 |  |               | 7,094    | 
|2029 |  |               | 13,676   | 
|2030 |  |               | 32,363   | 
|2031 |  |               | 108,560  | 
|     |  |               | $164,661 | 

19. Shares

a) Common shares

Authorized:

Unlimited number of voting common shares

Unlimited number of non-voting common shares

Issued and outstanding:



|                                                                         |  |                 |            |  |  |  |  |        |  |  |          | 
|------------------------------------------------------------------------ |  | --------------- | ---------- |  |  |  |  | ------ |  |  | -------- | 
|                                                                         |  | Number ofShares |            |  |  |  |  | Amount | 
|Voting common shares                                                     |  |                 |            |  |  |  |  |        |  |  |          | 
|Issued and outstanding at March 31, 2008                                 |  |                 | 35,929,476 |  |  |  |  |        |  |  | $301,894 | 
|Issued upon exercise of stock options                                    |  |                 | 109,000    |  |  |  |  |        |  |  | 703      | 
|Transferred from additional paid-in capital on exercise of stock options |  |                 |           |  |  |  |  |        |  |  | 834      | 
|Issued and outstanding at March 31, 2009                                 |  |                 | 36,038,476 |  |  |  |  |        |  |  | $303,431 | 
|Issued upon exercise of stock options                                    |  |                 | 10,800     |  |  |  |  |        |  |  | 53       | 
|Transferred from additional paid-in capital on exercise of stock options |  |                 |           |  |  |  |  |        |  |  | 21       | 
|Issued and outstanding at March 31, 2010                                 |  |                 | 36,049,276 |  |  |  |  |        |  |  | $303,505 | 
|Issued upon exercise of stock options                                    |  |                 | 193,250    |  |  |  |  |        |  |  | 963      | 
|Transferred from additional paid-in capital on exercise of stock options |  |                 |           |  |  |  |  |        |  |  | 386      | 
|Issued and outstanding at March 31, 2011                                 |  |                 | 36,242,526 |  |  |  |  |        |  |  | $304,854 | 

b) Net (loss)
income per share



|                                                   |  |      |            |   |  |  |  |      |  |  |            |  |  |      |  |  |  |  |            |  
|-------------------------------------------------- |  | ---- | ---------- | - |  |  |  | ---- |  |  | ---------- |  |  | ---- |  |  |  |  | ---------- | -
|                                                   |  | 2011 |            |   |  |  |  | 2010 |  |  |            |  |  | 2009 | 
|Year ended March 31,                               |  |      |            |   |  |  |  |      |  |  |            |  |  |      |  |  |  |  |            |  
|Net (loss) income available to common shareholders |  |      | $(34,709   | ) |  |  |  |      |  |  | $28,219    |  |  |      |  |  |  |  | $(135,404  | )
|Weighted average number of common shares           |  |      | 36,119,356 |   |  |  |  |      |  |  | 36,040,857 |  |  |      |  |  |  |  | 36,020,763 |  
|Basic net (loss) income per share                  |  |      | $(0.96     | ) |  |  |  |      |  |  | $0.78      |  |  |      |  |  |  |  | $(3.76     | )



|                                                                                        |  |      |            |   |  |  |  |      |  |  |            |  |  |      |  |  |  |  |            |  
|--------------------------------------------------------------------------------------- |  | ---- | ---------- | - |  |  |  | ---- |  |  | ---------- |  |  | ---- |  |  |  |  | ---------- | -
|                                                                                        |  | 2011 |            |   |  |  |  | 2010 |  |  |            |  |  | 2009 | 
|Year ended March 31,                                                                    |  |      |            |   |  |  |  |      |  |  |            |  |  |      |  |  |  |  |            |  
|Net (loss) income available to common shareholders                                      |  |      | $(34,709   | ) |  |  |  |      |  |  | $28,219    |  |  |      |  |  |  |  | $(135,404  | )
|Weighted average number of common shares                                                |  |      | 36,119,356 |   |  |  |  |      |  |  | 36,040,857 |  |  |      |  |  |  |  | 36,020,763 |  
|Dilutive effect of stock options, deferred performance share units and stock award plan |  |      |           |   |  |  |  |      |  |  | 680,169    |  |  |      |  |  |  |  |           |  
|Weighted average number of diluted common shares                                        |  |      | 36,119,356 |   |  |  |  |      |  |  | 36,721,026 |  |  |      |  |  |  |  | 36,020,763 |  
|Diluted net (loss) income per share                                                     |  |      | $(0.96     | ) |  |  |  |      |  |  | $0.77      |  |  |      |  |  |  |  | $(3.76     | )

For the year ended
March 31, 2011, there were 1,647,474, 75,591 and 150,000 stock options, deferred performance share units and stock awards respectively which were anti-dilutive and therefore were not considered in computing diluted earnings per share (March 31,
2010  820,641 and 57,311 stock options and deferred performance share units respectively; March 31, 2009  2,071,884 and 91,005, stock options and deferred performance share units respectively).



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|24 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



20. Interest expense



|                                         |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         |  
|---------------------------------------- |  | ---- | ------- |  |  |  |  | ---- |  |  | ------- |  |  | ---- |  |  |  |  | ------- | -
|                                         |  | 2011 |         |  |  |  |  | 2010 |  |  |         |  |  | 2009 | 
|Year ended March 31,                     |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         |  
|Interest on
83/4% senior notes and swaps |  |      | $1,238  |  |  |  |  |      |  |  | $19,041 |  |  |      |  |  |  |  | $25,379 |  
|Interest on capital lease obligations    |  |      | 689     |  |  |  |  |      |  |  | 1,032   |  |  |      |  |  |  |  | 1,234   |  
|Amortization of deferred financing costs |  |      | 1,609   |  |  |  |  |      |  |  | 3,348   |  |  |      |  |  |  |  | 2,970   |  
|Interest on credit facilities            |  |      | 5,361   |  |  |  |  |      |  |  | 2,375   |  |  |      |  |  |  |  | 298     |  
|Interest on Series 1 Debentures          |  |      | 20,132  |  |  |  |  |      |  |  |        |  |  |      |  |  |  |  |        |  
|Interest on long term debt               |  |      | $29,029 |  |  |  |  |      |  |  | $25,796 |  |  |      |  |  |  |  | $29,881 |  
|Other interest                           |  |      | 962     |  |  |  |  |      |  |  | 284     |  |  |      |  |  |  |  | (269    | )
|                                         |  |      | $29,991 |  |  |  |  |      |  |  | $26,080 |  |  |      |  |  |  |  | $29,612 |  

21. Claims
revenue



|                                                            |  |      |        |  |  |  |  |      |  |  |        |  |  |      |  |  |  |  |         | 
|----------------------------------------------------------- |  | ---- | ------ |  |  |  |  | ---- |  |  | ------ |  |  | ---- |  |  |  |  | ------- | 
|                                                            |  | 2011 |        |  |  |  |  | 2010 |  |  |        |  |  | 2009 | 
|Year ended March 31,                                        |  |      |        |  |  |  |  |      |  |  |        |  |  |      |  |  |  |  |         | 
|Claims revenue recognized                                   |  |      | $5,278 |  |  |  |  |      |  |  | $4,541 |  |  |      |  |  |  |  | $55,999 | 
|Claims revenue uncollected (classified as unbilled revenue) |  |      | 2,174  |  |  |  |  |      |  |  | 785    |  |  |      |  |  |  |  | 1,768   | 

22. Financial
instruments and risk management

In determining the fair value of financial instruments, the Company uses a variety of methods and assumptions that
are based on market conditions and risks existing on each reporting date. Standard market conventions and techniques, such as discounted cash flow analysis and option pricing models, are used to determine the fair value of the Companys
financial instruments, including derivatives. All methods of fair value measurement result in a general approximation of value and such value may never actually be realized.

The fair values of the Companys cash and cash equivalents, accounts receivable, unbilled revenue, accounts payable and accrued liabilities approximate their carrying amounts due to the relatively short
periods to maturity for the instruments.

The fair values of amounts due under the Credit Facilities are based on management estimates which are
determined by discounting cash flows required under the instruments at the interest rate currently estimated to be available for instruments with similar terms. Based on these estimates and by using the outstanding balance of $72.0 million at
March 31, 2011 and $28.4 million at March 31, 2010, the fair value of amounts due under the Credit Facilities as at March 31, 2011 and March 31, 2010 are not significantly different than their carrying value.

Financial instruments with carrying amounts that differ from their fair values are as follows:



|                              |  |                |         |  |  |  |  |                |  |  |         |  |  |                |  |  |  |  |          |            |  |  |  |  |  |  |          | 
|----------------------------- |  | -------------- | ------- |  |  |  |  | -------------- |  |  | ------- |  |  | -------------- |  |  |  |  | -------- | ---------- |  |  |  |  |  |  | -------- | 
|                              |  | March 31, 2011 |         |  |  |  |  | March 31, 2010 | 
|                              |  | CarryingAmount |         |  |  |  |  | FairValue      |  |  |         |  |  | CarryingAmount |  |  |  |  |          | Fair
Value | 
|83/4% senior notes(i)         |  |                | $      |  |  |  |  |                |  |  | $      |  |  |                |  |  |  |  | $203,120 |            |  |  |  |  |  |  | $203,526 | 
|Capital lease obligations(ii) |  |                | 8,693   |  |  |  |  |                |  |  | 8,658   |  |  |                |  |  |  |  | 13,393   |            |  |  |  |  |  |  | 13,291   | 
|Series 1 Debentures(iii)      |  |                | 225,000 |  |  |  |  |                |  |  | 238,651 |  |  |                |  |  |  |  |         |            |  |  |  |  |  |  |         | 

|(i) | The US Dollar denominated 83/4% senior notes were redeemed during the year ended March 31, 2011. The fair value of the
83/4% senior notes on March 31, 2010 was based upon the
period end closing market price translated into Canadian Dollars at period end exchange rates as at March 31, 2010. Expected discounted cash flows were not included in the fair value calculation.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(ii) | The fair values of amounts due under capital leases are based on management estimates which are determined by discounting cash flows required under the instruments at the
interest rates currently estimated to be available for instruments with similar terms.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(iii) | The fair value of the Series 1 Debentures is based upon the expected discounted cash flows and the period end market price of similar financial instruments.
|----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------

a) Fair value measurements

The
Company has segregated all financial assets and financial liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the
measurement date.

The fair values of the Companys embedded derivatives are based on appropriate price modeling commonly used by market
participants to estimate fair value. Such modeling includes option pricing models and discounted cash flow analysis, using observable market based inputs including foreign currency rates, implied volatilities and discount factors to estimate fair
value. The Company considers its own credit risk or the credit risk of the counterparty in determining fair value, depending on whether the fair values are in an asset or liability position. Fair value determined using valuation models requires the
use of assumptions concerning the amount and timing of future cash flows. Fair value amounts reflect managements best estimates using external, readily observable, market data such as futures prices, interest rate yield curves, foreign
exchange rates and discount rates for time value. It is possible that the assumptions used in establishing fair value amounts will differ from future outcomes and the effect of such variations could be material.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 25 | 



---

At March 31, 2011, the Company had no financial assets or financial liabilities measured at fair value on a
recurring basis which were classified as Level 1 or Level 3 under the fair value hierarchy. Since the Company primarily uses observable inputs of similar instruments and discounted cash flows in its valuation of its derivative financial instruments,
these fair value measurements are classified as Level 2 of the fair value hierarchy. Financial assets and liabilities measured at fair value net of accrued interest on a recurring basis, all of which are classified as Derivative financial
instruments on the Consolidated Balance Sheets are summarized below:



|                                                                                 |  |                |         |  
|-------------------------------------------------------------------------------- |  | -------------- | ------- | -
|March 31, 2011                                                                   |  | CarryingAmount |        
|Embedded price escalation features in a long term customer construction contract |  |                | $5,877  |  
|Embedded price escalation features in certain long term supplier contracts       |  |                | 5,651   |  
|                                                                                 |  |                | $11,528 |  
|Less: current portion                                                            |  |                | (2,474  | )
|                                                                                 |  |                | $9,054  |  



|                                                                                 |  |                |         |  
|-------------------------------------------------------------------------------- |  | -------------- | ------- | -
|March 31, 2010                                                                   |  | CarryingAmount |        
|Cross-currency swaps for US dollar
83/4% senior notes                            |  |                | $66,268 |  
|Interest rate swaps for US dollar 83/4% senior notes                             |  |                | 14,843  |  
|Cross-currency and interest rate swaps for US dollar
83/4% senior notes          |  |                | $81,111 |  
|Embedded price escalation features in a long term customer construction contract |  |                | 6,481   |  
|Embedded price escalation features in certain long term supplier contracts       |  |                | 9,463   |  
|                                                                                 |  |                | $97,055 |  
|Less: current portion                                                            |  |                | (22,054 | )
|                                                                                 |  |                | $75,001 |  

On April 8, 2010, the Company settled the cross-currency and interest rate swaps, including accrued interest for a total of $91,125 in
conjunction with the settlement of the 83/4% senior notes
(note 16(c)).

The realized and unrealized (gain) loss on derivative financial instruments is comprised as follows:



|                                                                                                          |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|--------------------------------------------------------------------------------------------------------- |  | ---- | ------- | - |  |  |  | ---- |  |  | ------- | - |  | ---- |  |  |  |  | -------- | -
|Year ended March 31,                                                                                      |  | 2011 |         |   |  |  |  | 2010 |  |  |         |   |  | 2009 | 
|Realized and unrealized loss (gain) on cross-currency and interest rate swaps                             |  |      | $2,111  |   |  |  |  |      |  |  | $64,637 |   |  |      |  |  |  |  | $(46,945 | )
|Unrealized (gain) loss on embedded price escalation features in a long term revenue construction contract |  |      | (604    | ) |  |  |  |      |  |  | 6,805   |   |  |      |  |  |  |  | (15,145  | )
|Unrealized (gain) loss on embedded price escalation features in certain long term supplier contracts      |  |      | (3,812  | ) |  |  |  |      |  |  | (13,315 | ) |  |      |  |  |  |  | 21,509   |  
|Unrealized (gain) loss on early redemption option on 83/4% senior notes                                   |  |      |        |   |  |  |  |      |  |  | (3,716  | ) |  |      |  |  |  |  | 3,331    |  
|                                                                                                          |  |      | $(2,305 | ) |  |  |  |      |  |  | $54,411 |   |  |      |  |  |  |  | $(37,250 | )

Non-financial assets
that were re-measured at fair value on a non-recurring basis as at March 31, 2011 and 2010 in the financial statements are summarized below:



|                     |  |                 |      |  |                      |  |       |                |  |  |                 |  |  |                      |      |  |  |  |       |  
|-------------------- |  | --------------- | ---- |  | -------------------- |  | ----- | -------------- |  |  | --------------- |  |  | -------------------- | ---- |  |  |  | ----- | -
|                     |  | March 31, 2011  |      |  |                      |  |       | March 31, 2010 | 
|                     |  | Carrying Amount |      |  | Change in Fair Value |  |       |                |  |  | Carrying Amount |  |  | Change in Fair Value |     
|Assets held for sale |  |                 | $721 |  |                      |  | $(141 | )              |  |  |                 |  |  |                      | $838 |  |  |  | $(806 | )

Assets held for sale
are re-measured at fair value less cost to sell on a non-recurring basis. For the year ended March 31, 2011, assets held for sale with a carrying amount of $862 (2010  $1,644) were written down to their fair value less cost to sell of
$721 (2010  $838), resulting in a loss of $141 (2010  $806), which was included in depreciation expense in the Consolidated Statements of Operations. The fair value less cost to sell of the assets held for sale is determined internally
by analyzing recent auction prices for equipment with similar specifications and hours used, the net book value, the residual value of the asset and the useful life of the asset. The inputs to estimate the fair value of the assets held for sale are
classified under Level 3 of the fair value hierarchy.

b) Risk Management

The Company is exposed to market and credit risks associated with its financial instruments. The Company will from time to time use various financial instruments to reduce market risk exposures from changes in
foreign currency exchange rates and interest rates. The Company does not hold or use any derivative instruments for trading or speculative purposes.

Overall, the Companys Board of Directors has responsibility for the establishment and approval of the Companys risk management policies. Management
performs a risk assessment on a continual basis to help ensure that all significant risks related to the Company and its operations have been reviewed and assessed to reflect changes in market conditions and the Companys operating activities.



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|26 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



c) Market Risk

Market risk is the risk that the fair value
or future cash flows of a financial instrument will fluctuate because of changes in market prices such as foreign currency exchange rates and interest rates. The level of market risk to which the Company is exposed at any point in time varies
depending on market conditions, expectations of future price or market rate movements and composition of the Companys financial assets and liabilities held, non-trading physical assets and contract portfolios.

To manage the exposure related to changes in market risk, the Company uses various risk management techniques including the use of derivative instruments. Such
instruments may be used to establish a fixed price for a commodity, an interest bearing obligation or a cash flow denominated in a foreign currency.

The
sensitivities provided below are hypothetical and should not be considered to be predictive of future performance or indicative of earnings on these contracts.

i) Foreign exchange risk

The Company regularly transacts in foreign currencies when purchasing equipment,
spare parts as well as certain general and administrative goods and services. These exposures are generally of a short-term nature and the impact of changes in exchange rates has not been significant in the past. The Company may fix its exposure in
either the Canadian Dollar or the US Dollar for these short term transactions, if material.

ii) Interest rate risk

The Company is exposed to interest rate risk from the possibility that changes in interest rates will affect future cash flows or the fair values of its financial
instruments. Interest expense on borrowings with floating interest rates, including the Companys Credit Facilities, varies as market interest rates change. At March 31, 2011, the Company held $72.0 million of floating rate debt pertaining
to its Credit Facilities (March 31, 2010  $28.4 million). As at March 31, 2011, holding all other variables constant, a 100 basis point increase (decrease) to interest rates on floating rate debt will result in $0.7 million increase
(decrease) in annual interest expense. This assumes that the amount of floating rate debt remains unchanged from that which was held at March 31, 2011.

The fair value of financial instruments with fixed interest rates, such as the Companys Series 1 Debentures, fluctuate with changes in market interest rates. However, these fluctuations do not affect
earnings, as the Companys debt is carried at amortized cost and the carrying value does not change as interest rates change.

The Company manages
its interest rate risk exposure by using a mix of fixed and variable rate debt and may use derivative instruments to achieve the desired proportion of variable to fixed-rate debt.

d) Credit Risk

Credit risk is the risk that financial loss to the Company may be incurred if a customer or
counterparty to a financial instrument fails to meet its contractual obligations. The Company manages the credit risk associated with its cash by holding its funds with what it believes to be reputable financial institutions. The Company is also
exposed to credit risk through its accounts receivable and unbilled revenue. Credit risk for trade and other accounts receivables, and unbilled revenue are managed through established credit monitoring activities.

The Company has a concentration of customers in the oil and gas sector. The concentration risk is mitigated primarily by the customers being large investment grade
organizations. The credit worthiness of new customers is subject to review by management through consideration of the type of customer and the size of the contract.

At March 31, 2011 and March 31, 2010, the following customers represented 10% or more of accounts receivable and unbilled revenue:



|           |  |               |     |  |  |  |  |               |  |  |     | 
|---------- |  | ------------- | --- |  |  |  |  | ------------- |  |  | --- | 
|           |  | March 31,2011 |     |  |  |  |  | March 31,2010 | 
|Customer A |  |               | 40% |  |  |  |  |               |  |  | 40% | 
|Customer B |  |               | 14% |  |  |  |  |               |  |  | 4%  | 
|Customer C |  |               | 12% |  |  |  |  |               |  |  | 38% | 

The Company
reviews its accounts receivable amounts regularly and amounts are written down to their expected realizable value when outstanding amounts are determined not to be fully collectible. This generally occurs when the customer has indicated an inability
to pay, the Company is unable to communicate with the customer over an extended period of time, and other methods to obtain payment have been considered and have not been successful. Bad debt expense is charged to project costs in the Consolidated
Statements of Operations in the period that the account is determined to be doubtful. Estimates of the allowance for doubtful accounts are determined on a customer-by-customer evaluation of collectability at each reporting date taking into
consideration the following factors: the length of time the receivable has been outstanding, specific knowledge of each customers financial condition and historical experience.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 27 | 



---

The Companys maximum exposure to credit risk for accounts receivable and unbilled revenue is as follows:



|                           |  |                |          |  |  |  |  |                |  |  |          | 
|-------------------------- |  | -------------- | -------- |  |  |  |  | -------------- |  |  | -------- | 
|                           |  | March 31,
2011 |          |  |  |  |  | March 31,
2010 | 
|Trade accounts receivables |  |                | $127,678 |  |  |  |  |                |  |  | $107,210 | 
|Other receivables          |  |                | 804      |  |  |  |  |                |  |  | 4,674    | 
|Total accounts receivable  |  |                | $128,482 |  |  |  |  |                |  |  | $111,884 | 
|Unbilled revenue           |  |                | $102,939 |  |  |  |  |                |  |  | $84,702  | 

On a geographic
basis as at March 31, 2011, approximately 95% (March 31, 2010  98%) of the balance of trade accounts receivable (before considering the allowance for doubtful accounts) was due from customers based in Western Canada.

Payment terms are generally net 30 days. As at March 31, 2011 and 2010, trade receivables are aged as follows:



|                    |  |                |          |  |  |  |  |                |  |  |          | 
|------------------- |  | -------------- | -------- |  |  |  |  | -------------- |  |  | -------- | 
|                    |  | March 31,
2011 |          |  |  |  |  | March 31,
2010 | 
|Not past due        |  |                | $98,626  |  |  |  |  |                |  |  | $84,041  | 
|Past due 1-30 days  |  |                | 18,911   |  |  |  |  |                |  |  | 15,635   | 
|Past due 31-60 days |  |                | 3,444    |  |  |  |  |                |  |  | 1,543    | 
|More than 61 days   |  |                | 6,697    |  |  |  |  |                |  |  | 5,991    | 
|Total               |  |                | $127,678 |  |  |  |  |                |  |  | $107,210 | 

As at
March 31, 2011, the Company has recorded an allowance for doubtful accounts of $30 (March 31, 2010  $1,691) of which 100% relates to amounts that are more than 61 days past due.

The allowance is an estimate of the March 31, 2011 trade receivable balances that are considered uncollectible. Changes to the allowance are as follows:



|                                       |  |      |        |   |  |  |  |      |  |  |        |   |  |      |  |  |  |  |        |  
|-------------------------------------- |  | ---- | ------ | - |  |  |  | ---- |  |  | ------ | - |  | ---- |  |  |  |  | ------ | -
|Year ended March 31,                   |  | 2011 |        |   |  |  |  | 2010 |  |  |        |   |  | 2009 | 
|Opening balance                        |  |      | $1,691 |   |  |  |  |      |  |  | $2,597 |   |  |      |  |  |  |  | $742   |  
|Payments received on provided balances |  |      | (682   | ) |  |  |  |      |  |  | (846   | ) |  |      |  |  |  |  | (100   | )
|Current year allowance                 |  |      | 518    |   |  |  |  |      |  |  | 334    |   |  |      |  |  |  |  | 4,324  |  
|Write-offs                             |  |      | (1,497 | ) |  |  |  |      |  |  | (394   | ) |  |      |  |  |  |  | (2,369 | )
|Ending balance                         |  |      | $30    |   |  |  |  |      |  |  | $1,691 |   |  |      |  |  |  |  | $2,597 |  

Credit risk on
derivative financial instruments arises from the possibility that the counterparties to the agreements may default on their respective obligations under the agreements. This credit risk only arises in instances where these agreements have positive
fair value for the Company.

23. Other information

a) Supplemental cash flow information



|                                                                                    |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|----------------------------------------------------------------------------------- |  | ---- | ------- | - |  |  |  | ---- |  |  | ------- | - |  | ---- |  |  |  |  | ------- | -
|Year ended March 31,                                                                |  | 2011 |         |   |  |  |  | 2010 |  |  |         |   |  | 2009 | 
|Cash paid during the year for:                                                      |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|Interest, including realized interest on interest rate swap                         |  |      | $33,559 |   |  |  |  |      |  |  | $49,999 |   |  |      |  |  |  |  | $29,336 |  
|Income taxes                                                                        |  |      | 4,149   |   |  |  |  |      |  |  | 10,395  |   |  |      |  |  |  |  | 52      |  
|Cash received during the year for:                                                  |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|Interest                                                                            |  |      | 1,168   |   |  |  |  |      |  |  | 10,998  |   |  |      |  |  |  |  | 477     |  
|Income taxes                                                                        |  |      | 2,260   |   |  |  |  |      |  |  | 453     |   |  |      |  |  |  |  | 2,734   |  
|Non-cash transactions:                                                              |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |         |  
|Acquisition of property, plant and equipment by means of capital leases             |  |      | 427     |   |  |  |  |      |  |  | 1,523   |   |  |      |  |  |  |  | 8,863   |  
|Additions to assets held for sale                                                   |  |      | (1,675  | ) |  |  |  |      |  |  | (1,739  | ) |  |      |  |  |  |  | (2,035  | )
|Net change in accounts payable related to purchase of property, plant and equipment |  |      | $(3,879 | ) |  |  |  |      |  |  | $1,840  |   |  |      |  |  |  |  | $(630   | )

b) Net change in
non-cash working capital



|                                                                                     |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |         |  
|------------------------------------------------------------------------------------ |  | ---- | -------- | - |  |  |  | ---- |  |  | -------- | - |  | ---- |  |  |  |  | ------- | -
|Year ended March 31,                                                                 |  | 2011 |          |   |  |  |  | 2010 |  |  |          |   |  | 2009 | 
|Operating activities:                                                                |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |         |  
|Accounts receivable, net                                                             |  |      | $(9,534  | ) |  |  |  |      |  |  | $(29,428 | ) |  |      |  |  |  |  | $88,687 |  
|Unbilled revenue                                                                     |  |      | (18,237  | ) |  |  |  |      |  |  | (28,795  | ) |  |      |  |  |  |  | 14,976  |  
|Inventories                                                                          |  |      | (2,661   | ) |  |  |  |      |  |  | 6,214    |   |  |      |  |  |  |  | (6,617  | )
|Prepaid expenses and deposits                                                        |  |      | 308      |   |  |  |  |      |  |  | (2,620   | ) |  |      |  |  |  |  | 1,015   |  
|Accounts payable                                                                     |  |      | 21,382   |   |  |  |  |      |  |  | 6,620    |   |  |      |  |  |  |  | (56,308 | )
|Accrued liabilities                                                                  |  |      | (5,434   | ) |  |  |  |      |  |  | 1,150    |   |  |      |  |  |  |  | 5,626   |  
|Long term portion of liabilities related to equipment leases                         |  |      | (2,196   | ) |  |  |  |      |  |  | 7,809    |   |  |      |  |  |  |  | 1,431   |  
|Billings in excess of costs incurred and estimated earnings on uncompleted
contracts |  |      | 390      |   |  |  |  |      |  |  | (541     | ) |  |      |  |  |  |  | (2,617  | )
|                                                                                     |  |      | $(15,982 | ) |  |  |  |      |  |  | $(39,591 | ) |  |      |  |  |  |  | $46,193 |  



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|28 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



24. Segmented information

a) General overview

The Company operates in the following reportable business segments, which follow the organization, management and reporting structure within the
Company:



| |  | Heavy Construction and Mining:
|- |  | ------------------------------

The
Heavy Construction and Mining segment provides mining and site preparation services, including overburden removal and reclamation services, project management, underground utility construction, equipment rental to a variety of customers,
environmental services including construction and modification of tailing ponds and reclamation of completed mine sites to environmental standards throughout Canada.



| |  | Piling:
|- |  | -------

The Piling segment provides
deep foundation construction and design build services to a variety of industrial and commercial customers throughout Western Canada and Ontario. It also designs and manufactures screw piles and pipeline anchoring systems and provides tank
maintenance services to the petro-chemical industry across Canada and the United States and sells pipeline anchoring systems globally.



| |  | Pipeline:
|- |  | ---------

The Pipeline segment provides
both small and large diameter pipeline construction and installation services as well as equipment rental to energy and industrial clients throughout Western Canada.

The accounting policies of the reportable operating segments are the same as those described in the significant accounting policies in note 2. Certain business units of the Company have been aggregated into the
Heavy Construction and Mining segment as they have similar economic characteristics based on the nature of the services provided, the customer base and the resources used to provide these services.

b) Results by business segment



|                                              |  |                             |          |   |  |  |  |        |  |  |          |   |  |          |  |  |  |  |          |       |  |  |  |  |  |  |          |  
|--------------------------------------------- |  | --------------------------- | -------- | - |  |  |  | ------ |  |  | -------- | - |  | -------- |  |  |  |  | -------- | ----- |  |  |  |  |  |  | -------- | -
|For the year ended March 31, 2011             |  | HeavyConstructionand Mining |          |   |  |  |  | Piling |  |  |          |   |  | Pipeline |  |  |  |  |          | Total | 
|Revenue from external customers               |  |                             | $667,037 |   |  |  |  |        |  |  | $105,559 |   |  |          |  |  |  |  | $85,452  |       |  |  |  |  |  |  | $858,048 |  
|Depreciation of property, plant and equipment |  |                             | 28,832   |   |  |  |  |        |  |  | 3,636    |   |  |          |  |  |  |  | 550      |       |  |  |  |  |  |  | 33,018   |  
|Segment profits                               |  |                             | 50,703   |   |  |  |  |        |  |  | 18,455   |   |  |          |  |  |  |  | (3,034   | )     |  |  |  |  |  |  | 66,124   |  
|Segment assets                                |  |                             | 423,947  |   |  |  |  |        |  |  | 116,623  |   |  |          |  |  |  |  | 37,053   |       |  |  |  |  |  |  | 577,623  |  
|Capital expenditures                          |  |                             | 29,577   |   |  |  |  |        |  |  | 2,560    |   |  |          |  |  |  |  | 1,124    |       |  |  |  |  |  |  | 33,261   |  
|                                              |  |                             |          |   |  |  | 
|For the year ended March 31, 2010             |  | HeavyConstructionand Mining |          |   |  |  |  | Piling |  |  |          |   |  | Pipeline |  |  |  |  |          | Total | 
|Revenue from external customers               |  |                             | $665,514 |   |  |  |  |        |  |  | $68,531  |   |  |          |  |  |  |  | $24,920  |       |  |  |  |  |  |  | $758,965 |  
|Depreciation of property, plant and equipment |  |                             | 34,419   |   |  |  |  |        |  |  | 2,842    |   |  |          |  |  |  |  | 153      |       |  |  |  |  |  |  | 37,414   |  
|Segment profits                               |  |                             | 111,016  |   |  |  |  |        |  |  | 11,288   |   |  |          |  |  |  |  | (3,851   | )     |  |  |  |  |  |  | 118,453  |  
|Segment assets                                |  |                             | 435,098  |   |  |  |  |        |  |  | 92,980   |   |  |          |  |  |  |  | 14,765   |       |  |  |  |  |  |  | 542,843  |  
|Capital expenditures                          |  |                             | 40,431   |   |  |  |  |        |  |  | 1,081    |   |  |          |  |  |  |  | 948      |       |  |  |  |  |  |  | 42,460   |  
|                                              |  |                             |          |   |  |  | 
|For the year ended March 31, 2009             |  | HeavyConstructionand Mining |          |   |  |  |  | Piling |  |  |          |   |  | Pipeline |  |  |  |  |          | Total | 
|Revenue from external customers               |  |                             | $716,053 |   |  |  |  |        |  |  | $155,076 |   |  |          |  |  |  |  | $101,407 |       |  |  |  |  |  |  | $972,536 |  
|Depreciation of property, plant and equipment |  |                             | 25,690   |   |  |  |  |        |  |  | 3,380    |   |  |          |  |  |  |  | 581      |       |  |  |  |  |  |  | 29,651   |  
|Segment profits                               |  |                             | 109,580  |   |  |  |  |        |  |  | 38,776   |   |  |          |  |  |  |  | 22,470   |       |  |  |  |  |  |  | 170,826  |  
|Impairment of goodwill                        |  |                             | (125,447 | ) |  |  |  |        |  |  | (18,000  | ) |  |          |  |  |  |  | (32,753  | )     |  |  |  |  |  |  | (176,200 | )
|Segment assets                                |  |                             | 373,861  |   |  |  |  |        |  |  | 88,908   |   |  |          |  |  |  |  | 7,898    |       |  |  |  |  |  |  | 470,667  |  
|Capital expenditures                          |  |                             | 76,354   |   |  |  |  |        |  |  | 8,679    |   |  |          |  |  |  |  | 75       |       |  |  |  |  |  |  | 85,108   |  



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 29 | 



---

c) Reconciliations

i) Income (loss) before income taxes



|                                                                        |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|----------------------------------------------------------------------- |  | ---- | -------- | - |  |  |  | ---- |  |  | -------- | - |  | ---- |  |  |  |  | --------- | -
|Year ended March 31,                                                    |  | 2011 |          |   |  |  |  | 2010 |  |  |          |   |  | 2009 | 
|Total profit for reportable segments                                    |  |      | $66,124  |   |  |  |  |      |  |  | $118,453 |   |  |      |  |  |  |  | $170,826  |  
|Less: unallocated corporate items:                                      |  |      |          |   |  |  |  |      |  |  |          |   |  |      |  |  |  |  |           |  
|General and administrative expenses                                     |  |      | 59,932   |   |  |  |  |      |  |  | 62,530   |   |  |      |  |  |  |  | 74,460    |  
|Loss on disposal of property, plant and equipment                       |  |      | 1,948    |   |  |  |  |      |  |  | 1,233    |   |  |      |  |  |  |  | 5,325     |  
|Loss on disposal of assets held for sale                                |  |      | 825      |   |  |  |  |      |  |  | 373      |   |  |      |  |  |  |  | 24        |  
|Amortization of intangible assets                                       |  |      | 3,540    |   |  |  |  |      |  |  | 1,719    |   |  |      |  |  |  |  | 1,501     |  
|Equity in loss (earnings) of unconsolidated joint venture               |  |      | 2,720    |   |  |  |  |      |  |  | (44      | ) |  |      |  |  |  |  |          |  
|Impairment of goodwill                                                  |  |      |         |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  | 176,200   |  
|Interest expense, net                                                   |  |      | 29,991   |   |  |  |  |      |  |  | 26,080   |   |  |      |  |  |  |  | 29,612    |  
|Foreign exchange (gain) loss                                            |  |      | (1,659   | ) |  |  |  |      |  |  | (48,901  | ) |  |      |  |  |  |  | 47,272    |  
|Realized and unrealized (gain) loss on derivative financial instruments |  |      | (2,305   | ) |  |  |  |      |  |  | 54,411   |   |  |      |  |  |  |  | (37,250   | )
|Loss on debt extinguishment                                             |  |      | 4,346    |   |  |  |  |      |  |  |         |   |  |      |  |  |  |  |          |  
|Other income                                                            |  |      | (104     | ) |  |  |  |      |  |  | (14      | ) |  |      |  |  |  |  | (5,955    | )
|Unallocated equipment costs (recoveries)(i)                             |  |      | 7,988    |   |  |  |  |      |  |  | (20,832  | ) |  |      |  |  |  |  | 408       |  
|(Loss) income before income taxes                                       |  |      | $(41,098 | ) |  |  |  |      |  |  | $41,898  |   |  |      |  |  |  |  | $(120,771 | )

|(i) | Unallocated equipment costs represent actual equipment costs, including non-cash items such as depreciation, which have not been allocated to reportable segments. Unallocated
equipment recoveries arise when actual equipment costs charged to the reportable segment exceed actual equipment costs incurred.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

ii)
Total assets



|                                     |  |               |          |  |  |  |  |               |  |  |          | 
|------------------------------------ |  | ------------- | -------- |  |  |  |  | ------------- |  |  | -------- | 
|                                     |  | March 31,2011 |          |  |  |  |  | March 31,2010 | 
|Corporate assets:                    |  |               |          |  |  |  |  |               |  |  |          | 
|Cash and cash equivalents            |  |               | $722     |  |  |  |  |               |  |  | $103,005 | 
|Property, plant and equipment        |  |               | 24,831   |  |  |  |  |               |  |  | 17,883   | 
|Deferred tax assets                  |  |               | 51,649   |  |  |  |  |               |  |  | 18,781   | 
|Other                                |  |               | 28,132   |  |  |  |  |               |  |  | 24,408   | 
|Total corporate assets               |  |               | $105,334 |  |  |  |  |               |  |  | $164,077 | 
|Total assets for reportable segments |  |               | 577,623  |  |  |  |  |               |  |  | 542,843  | 
|Total assets                         |  |               | $682,957 |  |  |  |  |               |  |  | $706,920 | 

The Companys
goodwill of $32,901 is assigned to the Piling segment. All of the Companys assets are located in Canada and the United States.

iii) Depreciation of property, plant and equipment



|                                           |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|------------------------------------------ |  | ---- | ------- |  |  |  |  | ---- |  |  | ------- |  |  | ---- |  |  |  |  | ------- | 
|Year ended March 31,                       |  | 2011 |         |  |  |  |  | 2010 |  |  |         |  |  | 2009 | 
|Total depreciation for reportable segments |  |      | $33,018 |  |  |  |  |      |  |  | $37,414 |  |  |      |  |  |  |  | $29,651 | 
|Depreciation for corporate assets          |  |      | 6,422   |  |  |  |  |      |  |  | 5,222   |  |  |      |  |  |  |  | 6,738   | 
|Total depreciation                         |  |      | $39,440 |  |  |  |  |      |  |  | $42,636 |  |  |      |  |  |  |  | $36,389 | 

iv) Capital
expenditures for long-lived assets



|                                                   |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|-------------------------------------------------- |  | ---- | ------- |  |  |  |  | ---- |  |  | ------- |  |  | ---- |  |  |  |  | ------- | 
|Year ended March 31,                               |  | 2011 |         |  |  |  |  | 2010 |  |  |         |  |  | 2009 | 
|Total capital expenditures for reportable segments |  |      | $33,261 |  |  |  |  |      |  |  | $42,460 |  |  |      |  |  |  |  | $85,108 | 
|Capital expenditures for corporate assets          |  |      | 7,904   |  |  |  |  |      |  |  | 12,790  |  |  |      |  |  |  |  | 5,096   | 
|Total capital expenditures for long-lived assets   |  |      | $41,165 |  |  |  |  |      |  |  | $55,250 |  |  |      |  |  |  |  | $90,204 | 

d) Customers

The following customers accounted for 10% or more of total revenues:



|                     |  |      |     |  |  |  |  |      |  |  |     |  |  |      |  |  |  |  |     | 
|-------------------- |  | ---- | --- |  |  |  |  | ---- |  |  | --- |  |  | ---- |  |  |  |  | --- | 
|Year ended March 31, |  | 2011 |     |  |  |  |  | 2010 |  |  |     |  |  | 2009 | 
|Customer A           |  |      | 29% |  |  |  |  |      |  |  | 51% |  |  |      |  |  |  |  | 31% | 
|Customer B           |  |      | 24% |  |  |  |  |      |  |  | 19% |  |  |      |  |  |  |  | 15% | 
|Customer C           |  |      | 10% |  |  |  |  |      |  |  | 9%  |  |  |      |  |  |  |  | 18% | 
|Customer D           |  |      | 8%  |  |  |  |  |      |  |  | 5%  |  |  |      |  |  |  |  | 15% | 
|Customer E           |  |      | 0%  |  |  |  |  |      |  |  | 0%  |  |  |      |  |  |  |  | 10% | 



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|30 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The revenue by major customer was earned by the Heavy Construction and Mining segment.

e) Geographic information

The geographic information for the Company as at and for the year ended
March 31, 2011 is as follows:



|              |  |         |          |  |  |  |  |                  |  |  |          | 
|------------- |  | ------- | -------- |  |  |  |  | ---------------- |  |  | -------- | 
|              |  | Revenue |          |  |  |  |  | Long-livedassets | 
|Canada        |  |         | $857,009 |  |  |  |  |                  |  |  | $381,577 | 
|United States |  |         | 1,039    |  |  |  |  |                  |  |  | 96       | 
|              |  |         | $858,048 |  |  |  |  |                  |  |  | $381,673 | 

25. Related
party transactions

The Sterling Group, L.P., Perry Strategic Capital Inc., and SF Holding Corp. are collectively the Sponsors of the
Company. The Company may receive consulting and advisory services provided by the Sponsors (principals or employees of such Sponsors are directors of the Company) with respect to the organization of the companies, employee benefit and compensation
arrangements, and other matters, and no fee is charged for these consulting and advisory services.

In order for the Sponsors to provide such advisory
and consulting services, the Company provides reports, financial data and other information to the Sponsors. This permits them to consult with and advise the Companys management on matters relating to its operations, company affairs and
finances. In addition, this permits them to visit and inspect any of the Companys properties and facilities.

Additionally, the Company provided
shared service support for its joint venture nominee, Noramac Ventures Inc. (note 11).

There were no material related party transactions during the
years ended March 31, 2011, 2010 and 2009. All related party transactions were in the normal course of operations and were measured at the exchange amount, being the consideration established and agreed to by the related parties.

26. Commitments

The annual future minimum lease payments for
heavy equipment, office equipment and premises in respect of operating leases, excluding contingent rentals, for the next five years and thereafter are as follows:



|                              |  |  |          | 
|----------------------------- |  |  | -------- | 
|For the year ending March 31, |  |  |          | 
|2012                          |  |  | $68,964  | 
|2013                          |  |  | 49,603   | 
|2014                          |  |  | 36,287   | 
|2015                          |  |  | 19,667   | 
|2016 and thereafter           |  |  | 4,248    | 
|                              |  |  | $178,769 | 

Total contingent
rentals on operating leases consisting principally of usage charges in excess of minimum contracted amounts for the years ended March 31, 2011, 2010 and 2009 amounted to $1,881, $10,246 and $7,665 respectively.

27. Employee benefit plans

The Company and its subsidiaries
match voluntary contributions made by employees to their Registered Retirement Savings Plans to a maximum of 5% of base salary for each employee. Contributions made by the Company during the year ended March 31, 2011 were $1,689 (2010 
$1,393; 2009  $2,540).

28. Stock-based compensation

a) Stock-based compensation expenses

Stock-based compensation expenses included in general and administrative
expenses are as follows:



|                                                  |  |      |        |   |  |  |  |      |  |  |        |  |  |      |  |  |  |  |        | 
|------------------------------------------------- |  | ---- | ------ | - |  |  |  | ---- |  |  | ------ |  |  | ---- |  |  |  |  | ------ | 
|Year ended March 31,                              |  | 2011 |        |   |  |  |  | 2010 |  |  |        |  |  | 2009 | 
|Share option plan (note 28(b))                    |  |      | $1,455 |   |  |  |  |      |  |  | $2,135 |  |  |      |  |  |  |  | $1,888 | 
|Senior executive stock option plan (note 28(c))   |  |      | 2,878  |   |  |  |  |      |  |  |       |  |  |      |  |  |  |  |       | 
|Deferred performance share unit plan (note 28(d)) |  |      | (44    | ) |  |  |  |      |  |  | 123    |  |  |      |  |  |  |  | 61     | 
|Restricted share unit plan (note 28(e))           |  |      | 1,603  |   |  |  |  |      |  |  | 1,010  |  |  |      |  |  |  |  |       | 
|Directors deferred stock unit plan (note 28(f))  |  |      | 1,484  |   |  |  |  |      |  |  | 2,002  |  |  |      |  |  |  |  | 356    | 
|Stock award plan (note 28(g))                     |  |      | 780    |   |  |  |  |      |  |  |       |  |  |      |  |  |  |  |       | 
|                                                  |  |      | $8,156 |   |  |  |  |      |  |  | $5,270 |  |  |      |  |  |  |  | $2,305 | 

b) Share option
plan

Under the 2004 Amended and Restated Share Option Plan, which was approved and became effective in 2006, directors, officers, employees and
certain service providers to the Company are eligible to receive stock options to acquire voting common shares in the Company. Each stock option provides the right to acquire one common share in the Company and



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 31 | 



---

expires ten years from the grant date or on termination of employment. Options may be exercised at a price determined at the time the option is awarded, and vest as follows: no options vest on
the award date and twenty percent vest on each subsequent anniversary date.



|                              |  |                   |           |   |  |  |  |                                            |  |  |        |  
|----------------------------- |  | ----------------- | --------- | - |  |  |  | ------------------------------------------ |  |  | ------ | -
|                              |  | Number of options |           |   |  |  |  | Weighted averageexercise price
$ per share | 
|Outstanding at March 31, 2008 |  |                   | 2,036,364 |   |  |  |  |                                            |  |  | 7.54   |  
|Granted                       |  |                   | 344,800   |   |  |  |  |                                            |  |  | 8.22   |  
|Exercised (i)                 |  |                   | (109,000  | ) |  |  |  |                                            |  |  | (6.45  | )
|Forfeited                     |  |                   | (200,280  | ) |  |  |  |                                            |  |  | (9.40  | )
|Outstanding at March 31, 2009 |  |                   | 2,071,884 |   |  |  |  |                                            |  |  | 7.53   |  
|Granted                       |  |                   | 375,700   |   |  |  |  |                                            |  |  | 8.88   |  
|Exercised (i)                 |  |                   | (10,800   | ) |  |  |  |                                            |  |  | (4.90  | )
|Options settled for cash      |  |                   | (95,720   | ) |  |  |  |                                            |  |  | (4.95  | )
|Forfeited                     |  |                   | (90,260   | ) |  |  |  |                                            |  |  | (8.53  | )
|Outstanding at March 31, 2010 |  |                   | 2,250,804 |   |  |  |  |                                            |  |  | 7.84   |  
|Granted                       |  |                   | 260,000   |   |  |  |  |                                            |  |  | 9.77   |  
|Exercised (i)                 |  |                   | (193,250  | ) |  |  |  |                                            |  |  | (4.98  | )
|Forfeited                     |  |                   | (120,080  | ) |  |  |  |                                            |  |  | (10.30 | )
|Modified (ii)                 |  |                   | (550,000  | ) |  |  |  |                                            |  |  | (5.00  | )
|Outstanding at March 31, 2011 |  |                   | 1,647,474 |   |  |  |  |                                            |  |  | 9.25   |  



|(i) | All stock options exercised resulted in new common shares being issued (note 19(a));
|--- | ------------------------------------------------------------------------------------

|(ii) | 550,000 stock options were modified as senior executive stock options on September 22, 2010 (note 28(c)).
|---- | ---------------------------------------------------------------------------------------------------------

Cash received from the option exercises for the year ended March 31, 2011 was $963 (2010  $53, 2009  $703). Cash paid for options settled for cash
for the year ended March 31, 2011 was $nil (2010  $244, 2009  $nil).The total intrinsic value of options exercised for the years ended March 31, 2011, 2010 and 2009 was $1,084, $277 and $1,238 respectively.

The following table summarizes information about stock options outstanding at March 31, 2011:



|               |  |                     |           |  |  |  |  |                               |  |  |           |  |  |                               |  |  |  |  |        |        |  |  |  |  |  |                               |         |  |  |  |  |                               |  |  |           |  |  |  |  |  |  |  |        | 
|-------------- |  | ------------------- | --------- |  |  |  |  | ----------------------------- |  |  | --------- |  |  | ----------------------------- |  |  |  |  | ------ | ------ |  |  |  |  |  | ----------------------------- | ------- |  |  |  |  | ----------------------------- |  |  | --------- |  |  |  |  |  |  |  | ------ | 
|               |  | Options outstanding |           |  |  |  |  | Options exercisable           | 
|Exercise price |  | Number              |           |  |  |  |  | Weightedaverageremaining life |  |  |           |  |  | Weightedaverage exerciseprice |  |  |  |  |        | Number |  |  |  |  |  | Weightedaverageremaining life |         |  |  |  |  | Weightedaverage exerciseprice | 
|$3.69          |  |                     | 140,040   |  |  |  |  |                               |  |  | 7.7 years |  |  |                               |  |  |  |  | $3.69  |        |  |  |  |  |  |                               | 53,220  |  |  |  |  |                               |  |  | 7.7 years |  |  |  |  |  |  |  | $3.69  | 
|$5.00          |  |                     | 440,294   |  |  |  |  |                               |  |  | 3.7 years |  |  |                               |  |  |  |  | $5.00  |        |  |  |  |  |  |                               | 420,294 |  |  |  |  |                               |  |  | 3.6 years |  |  |  |  |  |  |  | $5.00  | 
|$8.28          |  |                     | 136,000   |  |  |  |  |                               |  |  | 8.2 years |  |  |                               |  |  |  |  | $8.28  |        |  |  |  |  |  |                               | 32,000  |  |  |  |  |                               |  |  | 8.2 years |  |  |  |  |  |  |  | $8.28  | 
|$8.58          |  |                     | 60,000    |  |  |  |  |                               |  |  | 9.5 years |  |  |                               |  |  |  |  | $8.58  |        |  |  |  |  |  |                               |        |  |  |  |  |                               |  |  |          |  |  |  |  |  |  |  |       | 
|$9.33          |  |                     | 178,280   |  |  |  |  |                               |  |  | 8.9 years |  |  |                               |  |  |  |  | $9.33  |        |  |  |  |  |  |                               | 34,840  |  |  |  |  |                               |  |  | 8.9 years |  |  |  |  |  |  |  | $9.33  | 
|$10.13         |  |                     | 192,100   |  |  |  |  |                               |  |  | 9.7 years |  |  |                               |  |  |  |  | $10.13 |        |  |  |  |  |  |                               |        |  |  |  |  |                               |  |  |          |  |  |  |  |  |  |  |       | 
|$13.21         |  |                     | 75,000    |  |  |  |  |                               |  |  | 6.8 years |  |  |                               |  |  |  |  | $13.21 |        |  |  |  |  |  |                               | 45,000  |  |  |  |  |                               |  |  | 6.8 years |  |  |  |  |  |  |  | $13.21 | 
|$13.50         |  |                     | 216,200   |  |  |  |  |                               |  |  | 6.7 years |  |  |                               |  |  |  |  | $13.50 |        |  |  |  |  |  |                               | 132,440 |  |  |  |  |                               |  |  | 6.7 years |  |  |  |  |  |  |  | $13.50 | 
|$15.37         |  |                     | 56,800    |  |  |  |  |                               |  |  | 7.0 years |  |  |                               |  |  |  |  | $15.37 |        |  |  |  |  |  |                               | 40,480  |  |  |  |  |                               |  |  | 7.0 years |  |  |  |  |  |  |  | $15.37 | 
|$16.01         |  |                     | 75,000    |  |  |  |  |                               |  |  | 7.0 years |  |  |                               |  |  |  |  | $16.01 |        |  |  |  |  |  |                               | 30,000  |  |  |  |  |                               |  |  | 7.0 years |  |  |  |  |  |  |  | $16.01 | 
|$16.46         |  |                     | 50,000    |  |  |  |  |                               |  |  | 7.0 years |  |  |                               |  |  |  |  | $16.46 |        |  |  |  |  |  |                               | 20,000  |  |  |  |  |                               |  |  | 7.0 years |  |  |  |  |  |  |  | $16.46 | 
|$16.75         |  |                     | 27,760    |  |  |  |  |                               |  |  | 5.5 years |  |  |                               |  |  |  |  | $16.75 |        |  |  |  |  |  |                               | 22,208  |  |  |  |  |                               |  |  | 5.5 years |  |  |  |  |  |  |  | $16.75 | 
|               |  |                     | 1,647,474 |  |  |  |  |                               |  |  | 6.8 years |  |  |                               |  |  |  |  | $9.25  |        |  |  |  |  |  |                               | 830,482 |  |  |  |  |                               |  |  | 5.4 years |  |  |  |  |  |  |  | $8.52  | 

At March 31,
2011, the weighted average remaining contractual life of outstanding options is 6.8 years (March 31, 2010  6.6 years). The fair value of options vested during the year ended March 31, 2011 was $1,892 (March 31, 2010  $1,594). At
March 31, 2011, the Company had 830,482 exercisable options (March 31, 2010 1,244,908) with a weighted average exercise price of $8.52 (March 31, 2010  $6.46).

At March 31, 2011, the total compensation costs related to non-vested awards not yet recognized was $2,973 (March 31, 2010  $3,351) and these costs are expected to be recognized over a weighted average
period of 3.4 years (March 31, 2010  3.4 years).



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|32 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The fair value of each option granted by the Company was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:



|                                                   |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|-------------------------------------------------- |  | ---- | ------- |  |  |  |  | ---- |  |  | ------- |  |  | ---- |  |  |  |  | ------- | 
|Year ended March 31,                               |  | 2011 |         |  |  |  |  | 2010 |  |  |         |  |  | 2009 | 
|Number of options granted                          |  |      | 260,000 |  |  |  |  |      |  |  | 375,700 |  |  |      |  |  |  |  | 344,800 | 
|Weighted average fair value per option granted ($) |  |      | 6.79    |  |  |  |  |      |  |  | 6.25    |  |  |      |  |  |  |  | 4.53    | 
|Weighted average assumptions:                      |  |      |         |  |  |  |  |      |  |  |         |  |  |      |  |  |  |  |         | 
|Dividend yield                                     |  |      | Nil%    |  |  |  |  |      |  |  | Nil%    |  |  |      |  |  |  |  | Nil%    | 
|Expected volatility                                |  |      | 78.59%  |  |  |  |  |      |  |  | 76.27%  |  |  |      |  |  |  |  | 59.01%  | 
|Risk-free interest rate                            |  |      | 2.65%   |  |  |  |  |      |  |  | 3.39%   |  |  |      |  |  |  |  | 3.24%   | 
|Expected life (years)                              |  |      | 6.1     |  |  |  |  |      |  |  | 6.5     |  |  |      |  |  |  |  | 6.5     | 

The Company uses
company specific historical data to estimate the expected life of the option, such as employee option exercise and employee post-vesting departure behaviour. Since the Companys shares have been publicly traded for a period that is shorter than
the expected life of the share option, expected volatility is estimated based on the historical volatility of a peer group of similar entities in addition to its own historical volatility.

c) Senior executive stock option plan

On September 22, 2010, the Company modified a senior executive
employment agreement to allow the option holder the right to settle options in cash which resulted in 550,000 stock options (senior executive stock options) changing classification from equity to a long term liability. The liability is measured at
fair value using the Black-Scholes model at the modification date and subsequently at each period end date. Previously recognized compensation cost related to the senior executive stock option plan of $2,237 was transferred from additional paid-in
capital to the senior executive stock option liability on the modification date. Incremental compensation cost of $2,878 which was measured as the excess of the modification date fair value of the modified award over the modification date fair value
of the original award was recognized for the year ended March 31, 2011. Changes in fair value of the liability are recognized in the Consolidated Statements of Operations.

The weighted average assumptions used in estimating the fair value of the senior executive stock options as at March 31, 2011 are as follows:



|                                                   |  |  |         | 
|-------------------------------------------------- |  |  | ------- | 
|Number of senior executive stock options           |  |  | 550,000 | 
|Weighted average fair value per option granted ($) |  |  | 9.30    | 
|Weighted average assumptions:                      |  |  |         | 
|Dividend yield                                     |  |  | Nil%    | 
|Expected volatility                                |  |  | 76.74%  | 
|Risk-free interest rate                            |  |  | 1.77%   | 
|Expected life (years)                              |  |  | 4.10    | 

d) Deferred
performance share unit plan

Deferred Performance Share Units (DPSUs) are granted each fiscal year with respect of services to be
provided in that fiscal year and the following two fiscal years. The DPSUs vest at the end of a three-year term and are subject to the performance criteria approved by the Compensation Committee of the Board of Directors at the date of grant. Such
performance criterion includes the passage of time and is based upon return on invested capital calculated as operating income divided by average operating assets. The maturity date for such DPSUs is the last day of the third fiscal year following
the grant date. At the maturity date, the Compensation Committee assesses the participant against the performance criteria and determines the number of DPSUs that have been earned (earned DPSUs).

The settlement of the participants entitlement is made at the Companys option either in cash in an amount equivalent to the number of earned DPSUs
multiplied by the fair market value of the Companys common shares as determined by the volume weighted average trading price of the Companys common shares for the five trading days immediately preceding the date of maturity or in a
number of common shares equal to the number of earned DPSUs. If settled in common shares, the common shares are purchased on the open market or through the issuance of shares from treasury.

The fair value of each unit under the DPSU Plan was estimated on the date of the grant using Black-Scholes option pricing model. There were no DPSUs granted in fiscal 2011. The weighted average assumptions used in
estimating the fair value of the share options issued under the DPSU Plan in fiscal 2010 and 2009 are as follows:



|                                                 |  |      |         |  |  |  |  |      |  |  |         | 
|------------------------------------------------ |  | ---- | ------- |  |  |  |  | ---- |  |  | ------- | 
|Year ended March 31,                             |  | 2010 |         |  |  |  |  | 2009 | 
|Number of units granted                          |  |      | 908,165 |  |  |  |  |      |  |  | 111,020 | 
|Weighted average fair value per unit granted ($) |  |      | 4.71    |  |  |  |  |      |  |  | 12.34   | 
|Weighted average assumptions:                    |  |      |         |  |  |  |  |      |  |  |         | 
|Dividend yield                                   |  |      | Nil%    |  |  |  |  |      |  |  | Nil%    | 
|Expected volatility                              |  |      | 96.89%  |  |  |  |  |      |  |  | 56.25%  | 
|Risk-free interest rate                          |  |      | 1.47%   |  |  |  |  |      |  |  | 2.83%   | 
|Expected life (years)                            |  |      | 3.00    |  |  |  |  |      |  |  | 3.00    | 



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 33 | 



---

|                               |  |                 |          |  
|------------------------------ |  | --------------- | -------- | -
|                               |  | Number of units |         
|Outstanding at March 31, 2008  |  |                 |         |  
|Granted                        |  |                 | 111,020  |  
|Forfeited                      |  |                 | (20,015  | )
|Outstanding at March 31, 2009  |  |                 | 91,005   |  
|Granted                        |  |                 | 908,165  |  
|Forfeited                      |  |                 | (102,671 | )
|Converted to RSUs (note 28(e)) |  |                 | (389,204 | )
|Outstanding at March 31, 2010  |  |                 | 507,295  |  
|Forfeited                      |  |                 | (74,776  | )
|Outstanding at March 31, 2011  |  |                 | 432,519  |  

The weighted
average exercise price per unit is $nil.

At March 31, 2011, there were 111,020 units vested and the weighted average remaining contractual life of
outstanding DPSU units is 1.2 years (March 31, 2010  2.2 years). Compensation expense was adjusted based upon managements assessment of performance against return on invested capital targets and the ultimate number of units expected to
be issued. As at March 31, 2011, there was approximately $242 of total unrecognized compensation cost related to non-vested share-based payment arrangements under the DPSU Plan (March 31, 2010  $792), which is expected to be recognized
over a weighted average period of 2.0 years (March 31, 2010  2.2 years) and is subject to performance adjustments. On December 18, 2009, the Company converted 26,059 and 363,145 DPSUs into RSUs for the April 1, 2008 and April 1,
2009 grants respectively at a conversion factor of 80% (note 28(e)).

e) Restricted share unit plan

Restricted Share Units (RSUs) are granted each fiscal year with respect to services to be provided in that fiscal year and the following two fiscal
years. The RSUs vest at the end of a threeyear term. The Company classifies RSUs as a liability as the Company has the ability and intent to settle the awards in cash.

Compensation expense is calculated based on the percentage of the fair market value of RSUs that is accrued at the end of each period. The fair market value of each RSU is determined by the volume weighted average
trading price of the Companys common shares for the five trading days immediately preceding the day on which the fair market value is to be determined. The Company recognizes compensation expense over the three-year term of the RSUs.

On December 18, 2009, the Company converted certain middle managers DPSUs (note 28(d)) into RSUs at a conversion factor of 80%.



|                                                   |  |                 |         |  
|-------------------------------------------------- |  | --------------- | ------- | -
|                                                   |  | Number of units |        
|Outstanding at March 31, 2009                      |  |                 |        |  
|Converted from DPSUs at a conversion factor of 80% |  |                 | 311,358 |  
|Granted                                            |  |                 | 169,489 |  
|Forfeited                                          |  |                 | (12,032 | )
|Outstanding at March 31, 2010                      |  |                 | 468,815 |  
|Forfeited                                          |  |                 | (86,339 | )
|Outstanding at March 31, 2011                      |  |                 | 382,476 |  

At March 31,
2011, there were 17,320 units vested and the weighted average remaining contractual life of the RSUs outstanding was 1.3 years (March 31, 2010  2.3 years).

At March 31, 2011, the redemption value of these units was $11.96/unit (March 31, 2010  $9.68/unit).

Using
the redemption value of $11.96/unit at March 31, 2011, there was approximately $1,914 of total unrecognized compensation cost related to nonvested sharebased payment arrangements under the RSU Plan and these costs are expected to be
recognized over the weighted average remaining contractual life of the RSUs of 1.3 years (March 31, 2010  2.3 years). On approval of the RSU Plan in 2009, the Company reclassified $20 from additional paid-in capital to restricted share unit
liability related to the conversion of those employees converted from the DPSU Plan to the RSU Plan.

f) Directors deferred stock unit plan

On November 27, 2007, the Company approved a Directors Deferred Stock Unit (DDSU) Plan, which became effective
January 1, 2008. Under the DDSU Plan, nonofficer directors of the Company receive 50% of their annual fixed remuneration (which is included in general and administrative expenses) in the form of DDSUs and may elect to receive all or a
part of their annual fixed remuneration in excess of 50% in the form of DDSUs. The number of DDSUs to be credited to the participants deferred unit account is determined by dividing the amount of the participants deferred remuneration by the
Canadian Dollar equivalent of the volume weighted average trading price of the Companys common shares for the five trading days immediately preceding the date that participants remuneration becomes payable. The DDSUs vest immediately
upon issurance and are only redeemable upon death or retirement of the participant for cash determined by the market price of the



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|34 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



Companys common shares for the five trading days immediately preceding death or retirement. Directors, who are not US taxpayers, may elect to defer the maturity date until a date no later
than December 1st of the calendar year following the year in which the actual maturity date occurred.



|                              |  |                 |         | 
|----------------------------- |  | --------------- | ------- | 
|                              |  | Number of units |        
|Outstanding at March 31, 2008 |  |                 | 11,807  | 
|Issued                        |  |                 | 127,884 | 
|Outstanding at March 31, 2009 |  |                 | 139,691 | 
|Issued                        |  |                 | 123,575 | 
|Outstanding at March 31, 2010 |  |                 | 263,266 | 
|Issued                        |  |                 | 73,752  | 
|Outstanding at March 31, 2011 |  |                 | 337,018 | 

At March 31,
2011, the redemption value of these units was $11.96/unit (March 31, 2010  $9.68/unit). There is no unrecognized compensation expense related to the DDSUs, since these awards vest immediately when issued.

g) Stock award plan

On September 24, 2009, the Chief
Executive Officers (CEO) employment agreement was extended by the Board of Directors for a further period of two years, to May 8, 2012. In addition to the existing conditions in his employment agreement, the CEO was awarded the right to
receive 150,000 common shares of the Company as follows:



| |  | 50,000 shares on May 8, 2011;
|- |  | -----------------------------



| |  | 50,000 shares on November 8, 2011; and
|- |  | --------------------------------------



| |  | 50,000 shares on May 8, 2012.
|- |  | -----------------------------

These
shares will be awarded to the CEO provided he remains employed on the award dates above. As of September 24, 2010, the effective date, the CEO was granted a right to receive 150,000 common shares of the Company or at the discretion of the
Company, the cash equivalent thereof.

The CEOs entitlement, upon the above release dates, shall be settled in common shares purchased on the open
market or through the issuance of common shares from treasury, in each case net of required withholdings. The CEOs entitlement may be settled with newly issued common shares from treasury, if all necessary shareholder approvals and regulatory
approvals, if any, are obtained. The Company has no intention to settle in cash.

The estimate of the fair value of the stock award on the grant date is
equal to the market price of the Companys common shares.

At March 31, 2011, none of the stock awards have vested and the weighted average
remaining contractual life of outstanding Stock Award Plan units is 0.6 years (March 31, 2010  1.6 years). As at March 31, 2011, there was approximately $270 (March 31, 2010  $784) of total unrecognized compensation cost related to
nonvested sharebased payment arrangements under the stock award plan, which is expected to be recognized over a weighted average period of 0.6 years (March 31, 2010  1.6 years).

29. Contingencies

During the normal course of the
Companys operations, various legal and tax matters are pending. In the opinion of management, these matters will not have a material effect on the Companys consolidated financial position or results of operations.

30. Comparative figures

Certain of the comparative figures
have been reclassified from statements previously presented to conform to the presentation of the current period consolidated financial statements.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 35 | 



---

31. United States and Canadian accounting policy differences

These consolidated financial statements have been prepared in accordance with US GAAP, which differs in certain respects from Canadian GAAP. If Canadian GAAP
were employed, the Companys comprehensive income (loss) would be adjusted as follows:

Consolidated Statements of Operations, Comprehensive Loss
and Deficit  for the year ended March 31, 2011



|                                                                    |  |         |           |   |  |  |             |  |         |   |  |               |  |  |           |  
|------------------------------------------------------------------- |  | ------- | --------- | - |  |  | ----------- |  | ------- | - |  | ------------- |  |  | --------- | -
|                                                                    |  | US GAAP |           |   |  |  | Adjustments |  |         |   |  | Canadian GAAP | 
|Revenue (g)                                                         |  |         | $858,048  |   |  |  |             |  | $ 6,098 |   |  |               |  |  | $864,146  |  
|Project costs(g)                                                    |  |         | 456,119   |   |  |  |             |  | 7,339   |   |  |               |  |  | 463,458   |  
|Equipment costs                                                     |  |         | 234,933   |   |  |  |             |  |        |   |  |               |  |  | 234,933   |  
|Equipment operating lease expense                                   |  |         | 69,420    |   |  |  |             |  |        |   |  |               |  |  | 69,420    |  
|Depreciation(a)                                                     |  |         | 39,440    |   |  |  |             |  | (111    | ) |  |               |  |  | 39,329    |  
|Gross profit                                                        |  |         | 58,136    |   |  |  |             |  | (1,130  | ) |  |               |  |  | 57,006    |  
|General and administrative expenses(c)(g)                           |  |         | 59,932    |   |  |  |             |  | 111     |   |  |               |  |  | 60,043    |  
|Loss on disposal of property, plant and equipment                   |  |         | 1,948     |   |  |  |             |  |        |   |  |               |  |  | 1,948     |  
|Loss on disposal of assets held for sale                            |  |         | 825       |   |  |  |             |  |        |   |  |               |  |  | 825       |  
|Amortization of intangible assets(b)                                |  |         | 3,540     |   |  |  |             |  | 706     |   |  |               |  |  | 4,246     |  
|Equity in loss of unconsolidated joint venture(g)                   |  |         | 2,720     |   |  |  |             |  | (2,720  | ) |  |               |  |  |          |  
|Operating loss before the undernoted                                |  |         | (10,829   | ) |  |  |             |  | 773     |   |  |               |  |  | (10,056   | )
|Interest expense, net(b)                                            |  |         | 29,991    |   |  |  |             |  | (1,193  | ) |  |               |  |  | 28,798    |  
|Foreign exchange gain                                               |  |         | (1,659    | ) |  |  |             |  |        |   |  |               |  |  | (1,659    | )
|Realized and unrealized gain on derivative financial instruments(d) |  |         | (2,305    | ) |  |  |             |  | (5,802  | ) |  |               |  |  | (8,107    | )
|Loss on debt extinguishment(b)                                      |  |         | 4,346     |   |  |  |             |  | (2,884  | ) |  |               |  |  | 1,462     |  
|Other income                                                        |  |         | (104      | ) |  |  |             |  |        |   |  |               |  |  | (104      | )
|Loss before income taxes                                            |  |         | (41,098   | ) |  |  |             |  | 10,652  |   |  |               |  |  | (30,446   | )
|Income taxes (benefit):                                             |  |         |           |   |  |  |             |  |         |   |  |               |  |  |           |  
|Current                                                             |  |         | 2,892     |   |  |  |             |  |        |   |  |               |  |  | 2,892     |  
|Deferred(h)                                                         |  |         | (9,340    | ) |  |  |             |  | 1,688   |   |  |               |  |  | (7,652    | )
|Net loss                                                            |  |         | (34,650   | ) |  |  |             |  | 8,964   |   |  |               |  |  | (25,686   | )
|Other comprehensive loss                                            |  |         |           |   |  |  |             |  |         |   |  |               |  |  |           |  
|Unrealized foreign currency translation loss                        |  |         | 59        |   |  |  |             |  |        |   |  |               |  |  | 59        |  
|Comprehensive loss                                                  |  |         | (34,709   | ) |  |  |             |  | 8,964   |   |  |               |  |  | (25,745   | )
|Deficit, beginning of year                                          |  |         | (129,886  | ) |  |  |             |  | 1,081   |   |  |               |  |  | (128,805  | )
|Deficit, end of year                                                |  |         | $(164,536 | ) |  |  |             |  | $10,045 |   |  |               |  |  | $(154,491 | )
|Net loss per share  basic                                          |  |         | $(0.96    | ) |  |  |             |  | $0.25   |   |  |               |  |  | $(0.71    | )
|Net loss per share  diluted                                        |  |         | $(0.96    | ) |  |  |             |  | $0.25   |   |  |               |  |  | $(0.71    | )



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|36 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



Consolidated Statements of Operations, Comprehensive Income and Deficit  for the year ended March 31, 2010



|                                                                    |  |         |           |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |           |  
|------------------------------------------------------------------- |  | ------- | --------- | - |  |  |  | ----------- |  |  | ------ | - |  | ------------- |  |  |  |  | --------- | -
|                                                                    |  | US GAAP |           |   |  |  |  | Adjustments |  |  |        |   |  | Canadian GAAP | 
|Revenue (g)                                                         |  |         | $758,965  |   |  |  |  |             |  |  | $4,336 |   |  |               |  |  |  |  | $763,301  |  
|Project costs(g)                                                    |  |         | 301,307   |   |  |  |  |             |  |  | 3,542  |   |  |               |  |  |  |  | 304,849   |  
|Equipment costs                                                     |  |         | 209,408   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 209,408   |  
|Equipment operating lease expense                                   |  |         | 66,329    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 66,329    |  
|Depreciation(a)                                                     |  |         | 42,636    |   |  |  |  |             |  |  | (124   | ) |  |               |  |  |  |  | 42,512    |  
|Gross profit                                                        |  |         | 139,285   |   |  |  |  |             |  |  | 918    |   |  |               |  |  |  |  | 140,203   |  
|General and administrative expenses(c)(g)                           |  |         | 62,530    |   |  |  |  |             |  |  | 706    |   |  |               |  |  |  |  | 63,236    |  
|Loss on disposal of property, plant and equipment                   |  |         | 1,233     |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 1,233     |  
|Loss on disposal of assets held for sale                            |  |         | 373       |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 373       |  
|Amortization of intangible assets(b)                                |  |         | 1,719     |   |  |  |  |             |  |  | 831    |   |  |               |  |  |  |  | 2,550     |  
|Equity in earnings of unconsolidated joint venture(g)               |  |         | (44       | ) |  |  |  |             |  |  | 44     |   |  |               |  |  |  |  |          |  
|Operating income before the undernoted                              |  |         | 73,474    |   |  |  |  |             |  |  | (663   | ) |  |               |  |  |  |  | 72,811    |  
|Interest expense, net(b)                                            |  |         | 26,080    |   |  |  |  |             |  |  | (2,486 | ) |  |               |  |  |  |  | 23,594    |  
|Foreign exchange gain(b)                                            |  |         | (48,901   | ) |  |  |  |             |  |  | 496    |   |  |               |  |  |  |  | (48,405   | )
|Realized and unrealized loss on derivative financial instruments(d) |  |         | 54,411    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 54,411    |  
|Other income                                                        |  |         | (14       | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (14       | )
|Income before income taxes                                          |  |         | 41,898    |   |  |  |  |             |  |  | 1,327  |   |  |               |  |  |  |  | 43,225    |  
|Income taxes:                                                       |  |         |           |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |           |  
|Current                                                             |  |         | 3,803     |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 3,803     |  
|Deferred(h)                                                         |  |         | 9,876     |   |  |  |  |             |  |  | 372    |   |  |               |  |  |  |  | 10,248    |  
|Net income and comprehensive income for the year                    |  |         | 28,219    |   |  |  |  |             |  |  | 955    |   |  |               |  |  |  |  | 29,174    |  
|Deficit, beginning of year                                          |  |         | (158,105  | ) |  |  |  |             |  |  | 126    |   |  |               |  |  |  |  | (157,979  | )
|Deficit, end of year                                                |  |         | $(129,886 | ) |  |  |  |             |  |  | $1,081 |   |  |               |  |  |  |  | $(128,805 | )
|Net income per share  basic                                        |  |         | $0.78     |   |  |  |  |             |  |  | $0.03  |   |  |               |  |  |  |  | $0.81     |  
|Net income per share  diluted                                      |  |         | $0.77     |   |  |  |  |             |  |  | $0.02  |   |  |               |  |  |  |  | $0.79     |  



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 37 | 



---

Consolidated Statements of Operations, Comprehensive Loss and Deficit  for the year ended March 31, 2009



|                                                                    |  |         |           |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |           |  
|------------------------------------------------------------------- |  | ------- | --------- | - |  |  |  | ----------- |  |  | ------ | - |  | ------------- |  |  |  |  | --------- | -
|                                                                    |  | US GAAP |           |   |  |  |  | Adjustments |  |  |        |   |  | Canadian GAAP | 
|Revenue                                                             |  |         | $972,536  |   |  |  |  |             |  |  | $     |   |  |               |  |  |  |  | $972,536  |  
|Project costs                                                       |  |         | 505,026   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 505,026   |  
|Equipment costs                                                     |  |         | 217,120   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 217,120   |  
|Equipment operating lease expense                                   |  |         | 43,583    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 43,583    |  
|Depreciation(a)                                                     |  |         | 36,389    |   |  |  |  |             |  |  | (162   | ) |  |               |  |  |  |  | 36,227    |  
|Gross profit                                                        |  |         | 170,418   |   |  |  |  |             |  |  | 162    |   |  |               |  |  |  |  | 170,580   |  
|General and administrative expenses(c)                              |  |         | 74,460    |   |  |  |  |             |  |  | (55    | ) |  |               |  |  |  |  | 74,405    |  
|Loss on disposal of property, plant and equipment                   |  |         | 5,325     |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 5,325     |  
|Loss on disposal of assets held for sale                            |  |         | 24        |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 24        |  
|Amortization of intangible assets(b)                                |  |         | 1,501     |   |  |  |  |             |  |  | 837    |   |  |               |  |  |  |  | 2,338     |  
|Impairment of goodwill                                              |  |         | 176,200   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 176,200   |  
|Operating loss before the undernoted                                |  |         | (87,092   | ) |  |  |  |             |  |  | (620   | ) |  |               |  |  |  |  | (87,712   | )
|Interest expense, net(b)                                            |  |         | 29,612    |   |  |  |  |             |  |  | (2,162 | ) |  |               |  |  |  |  | 27,450    |  
|Foreign exchange loss(b)                                            |  |         | 47,272    |   |  |  |  |             |  |  | (606   | ) |  |               |  |  |  |  | 46,666    |  
|Realized and unrealized gain on derivative financial instruments(d) |  |         | (37,250   | ) |  |  |  |             |  |  | 4,655  |   |  |               |  |  |  |  | (32,595   | )
|Other income                                                        |  |         | (5,955    | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (5,955    | )
|Loss before income taxes                                            |  |         | (120,771  | ) |  |  |  |             |  |  | (2,507 | ) |  |               |  |  |  |  | (123,278  | )
|Income taxes:                                                       |  |         |           |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |           |  
|Current                                                             |  |         | 5,546     |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 5,546     |  
|Deferred(h)                                                         |  |         | 9,087     |   |  |  |  |             |  |  | (34    | ) |  |               |  |  |  |  | 9,053     |  
|Net loss and comprehensive loss for the year                        |  |         | (135,404  | ) |  |  |  |             |  |  | (2,473 | ) |  |               |  |  |  |  | (137,877  | )
|Deficit, beginning of year                                          |  |         | (22,701   | ) |  |  |  |             |  |  | 1,608  |   |  |               |  |  |  |  | (21,093   | )
|Change in accounting policy related to inventories(f)               |  |         |          |   |  |  |  |             |  |  | 991    |   |  |               |  |  |  |  | 991       |  
|Deficit, end of year                                                |  |         | $(158,105 | ) |  |  |  |             |  |  | $126   |   |  |               |  |  |  |  | $(157,979 | )
|Net loss per share  basic                                          |  |         | $(3.76    | ) |  |  |  |             |  |  | $(0.07 | ) |  |               |  |  |  |  | $(3.83    | )
|Net loss per share  diluted                                        |  |         | $(3.76    | ) |  |  |  |             |  |  | $(0.07 | ) |  |               |  |  |  |  | $(3.83    | )



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|38 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The cumulative effect of material differences between US and Canadian GAAP on the Consolidated Balance Sheets of the Company is as follows:

Consolidated Balance Sheets  March 31, 2011



|                                                                                                                               |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|------------------------------------------------------------------------------------------------------------------------------ |  | ------- | -------- | - |  |  |  | ----------- |  |  | ------- | - |  | ------------- |  |  |  |  | -------- | -
|                                                                                                                               |  | US GAAP |          |   |  |  |  | Adjustments |  |  |         |   |  | Canadian GAAP | 
|Assets                                                                                                                         |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|Current assets                                                                                                                 |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|Cash and cash equivalents                                                                                                      |  |         | $722     |   |  |  |  |             |  |  | $      |   |  |               |  |  |  |  | $722     |  
|Accounts receivable, net(g)                                                                                                    |  |         | 128,482  |   |  |  |  |             |  |  | 1,734   |   |  |               |  |  |  |  | 130,216  |  
|Unbilled revenue(g)                                                                                                            |  |         | 102,939  |   |  |  |  |             |  |  | 1,973   |   |  |               |  |  |  |  | 104,912  |  
|Inventories                                                                                                                    |  |         | 7,735    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 7,735    |  
|Prepaid expenses and deposits(g)                                                                                               |  |         | 8,269    |   |  |  |  |             |  |  | 4       |   |  |               |  |  |  |  | 8,273    |  
|Investment in and advances to unconsolidated joint venture                                                                     |  |         | 1,488    |   |  |  |  |             |  |  | (1,488  | ) |  |               |  |  |  |  |         |  
|Assets held for sale                                                                                                           |  |         |         |   |  |  |  |             |  |  | 453     |   |  |               |  |  |  |  | 453      |  
|Deferred tax assets                                                                                                            |  |         | 1,729    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 1,729    |  
|                                                                                                                               |  |         | 251,364  |   |  |  |  |             |  |  | 2,676   |   |  |               |  |  |  |  | 254,040  |  
|Property, plant and equipment, net(a) (g)                                                                                      |  |         | 321,864  |   |  |  |  |             |  |  | (425    | ) |  |               |  |  |  |  | 321,439  |  
|Other assets(b) (f) (g)                                                                                                        |  |         | 26,908   |   |  |  |  |             |  |  | (6,293  | ) |  |               |  |  |  |  | 20,615   |  
|Goodwill                                                                                                                       |  |         | 32,901   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 32,901   |  
|Deferred tax assets                                                                                                            |  |         | 49,920   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 49,920   |  
|Total Assets                                                                                                                   |  |         | $682,957 |   |  |  |  |             |  |  | $(4,042 | ) |  |               |  |  |  |  | $678,915 |  
|Liabilities and Shareholders Equity                                                                                           |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|Current liabilities                                                                                                            |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|Accounts payable(g)                                                                                                            |  |         | $86,053  |   |  |  |  |             |  |  | $2,670  |   |  |               |  |  |  |  | $88,723  |  
|Accrued liabilities(g)                                                                                                         |  |         | 32,814   |   |  |  |  |             |  |  | 6       |   |  |               |  |  |  |  | 32,820   |  
|Billings in excess of costs incurred and estimated earnings on uncompleted contracts                                           |  |         | 2,004    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 2,004    |  
|Current portion of capital lease obligations                                                                                   |  |         | 4,862    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 4,862    |  
|Current portion of term facilities                                                                                             |  |         | 10,000   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 10,000   |  
|Current portion of derivative financial instruments                                                                            |  |         | 2,474    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 2,474    |  
|Deferred tax liabilities                                                                                                       |  |         | 27,612   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 27,612   |  
|                                                                                                                               |  |         | 165,819  |   |  |  |  |             |  |  | 2,676   |   |  |               |  |  |  |  | 168,495  |  
|Capital lease obligations                                                                                                      |  |         | 3,831    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 3,831    |  
|Long term debt(b) (d)                                                                                                          |  |         | 286,970  |   |  |  |  |             |  |  | (12,338 | ) |  |               |  |  |  |  | 274,632  |  
|Derivative financial instruments                                                                                               |  |         | 9,054    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 9,054    |  
|Other long term obligations                                                                                                    |  |         | 25,576   |   |  |  |  |             |  |  | (1,320  | ) |  |               |  |  |  |  | 24,256   |  
|Deferred tax liabilities(h)                                                                                                    |  |         | 44,441   |   |  |  |  |             |  |  | 636     |   |  |               |  |  |  |  | 45,077   |  
|                                                                                                                               |  |         | 535,691  |   |  |  |  |             |  |  | (10,346 | ) |  |               |  |  |  |  | 525,345  |  
|Shareholders equity                                                                                                           |  |         |          |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |          |  
|Common shares (authorized  unlimited number of voting common shares; issued and outstanding  March 31, 2011 
36,242,526)(e) |  |         | 304,854  |   |  |  |  |             |  |  | (3,458  | ) |  |               |  |  |  |  | 301,396  |  
|Additional paid-in capital(c) (h)                                                                                              |  |         | 7,007    |   |  |  |  |             |  |  | (283    | ) |  |               |  |  |  |  | 6,724    |  
|Deficit(a-h)                                                                                                                   |  |         | (164,536 | ) |  |  |  |             |  |  | 10,045  |   |  |               |  |  |  |  | (154,491 | )
|Accumulated other comprehensive loss                                                                                           |  |         | (59      | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (59      | )
|                                                                                                                               |  |         | 147,266  |   |  |  |  |             |  |  | 6,304   |   |  |               |  |  |  |  | 153,570  |  
|Total liabilities and shareholders equity                                                                                     |  |         | $682,957 |   |  |  |  |             |  |  | $(4,042 | ) |  |               |  |  |  |  | $678,915 |  



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 39 | 



---

Consolidated Balance Sheets  March 31, 2010



|                                                                                                                               |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|------------------------------------------------------------------------------------------------------------------------------ |  | ------- | -------- | - |  |  |  | ----------- |  |  | -------- | - |  | ------------- |  |  |  |  | -------- | -
|                                                                                                                               |  | US GAAP |          |   |  |  |  | Adjustments |  |  |          |   |  | Canadian GAAP | 
|Assets                                                                                                                         |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|Current assets                                                                                                                 |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|Cash and cash equivalents(g)                                                                                                   |  |         | $103,005 |   |  |  |  |             |  |  | $1,240   |   |  |               |  |  |  |  | $104,245 |  
|Accounts receivable, net(g)                                                                                                    |  |         | 111,884  |   |  |  |  |             |  |  | 1,432    |   |  |               |  |  |  |  | 113,316  |  
|Unbilled revenue(g)                                                                                                            |  |         | 84,702   |   |  |  |  |             |  |  | 1,794    |   |  |               |  |  |  |  | 86,496   |  
|Inventories                                                                                                                    |  |         | 3,047    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 3,047    |  
|Prepaid expenses and deposits(g)                                                                                               |  |         | 6,881    |   |  |  |  |             |  |  | 87       |   |  |               |  |  |  |  | 6,968    |  
|Deferred tax assets                                                                                                            |  |         | 3,481    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 3,481    |  
|                                                                                                                               |  |         | 313,000  |   |  |  |  |             |  |  | 4,553    |   |  |               |  |  |  |  | 317,553  |  
|Property, plant and equipment, net(a) (g)                                                                                      |  |         | 331,355  |   |  |  |  |             |  |  | (536     | ) |  |               |  |  |  |  | 330,819  |  
|Other asset(b) (f) (g)                                                                                                         |  |         | 22,154   |   |  |  |  |             |  |  | (7,551   | ) |  |               |  |  |  |  | 14,603   |  
|Goodwill                                                                                                                       |  |         | 25,111   |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 25,111   |  
|Deferread tax assets                                                                                                           |  |         | 15,300   |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 15,300   |  
|Total Assets                                                                                                                   |  |         | $706,920 |   |  |  |  |             |  |  | $(3,534) |   |  |               |  |  |  |  | $703,386 |  
|Liabilities and Shareholders Equity                                                                                           |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|Current liabilities                                                                                                            |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|Accounts payable(g)                                                                                                            |  |         | $66,876  |   |  |  |  |             |  |  | $1,637   |   |  |               |  |  |  |  | $68,513  |  
|Accrued liabilities                                                                                                            |  |         | 47,191   |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 47,191   |  
|Billings in excess of costs incurred and estimated earnings on uncompleted contracts                                           |  |         | 1,614    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 1,614    |  
|Current portion of capital lease obligations                                                                                   |  |         | 5,053    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 5,053    |  
|Current portion of term facilities                                                                                             |  |         | 6,072    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 6,072    |  
|Current portion of derivative financial instruments(b) (d)                                                                     |  |         | 22,054   |   |  |  |  |             |  |  | (1,506   | ) |  |               |  |  |  |  | 20,548   |  
|Deferred tax liabilities                                                                                                       |  |         | 16,781   |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 16,781   |  
|                                                                                                                               |  |         | 165,641  |   |  |  |  |             |  |  | 131      |   |  |               |  |  |  |  | 165,772  |  
|Capital lease obligations                                                                                                      |  |         | 8,340    |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 8,340    |  
|Long term debt(b) (d)                                                                                                          |  |         | 225,494  |   |  |  |  |             |  |  | (1,506   | ) |  |               |  |  |  |  | 223,988  |  
|Derivative financial instruments(b) (d)                                                                                        |  |         | 75,001   |   |  |  |  |             |  |  | 1,506    |   |  |               |  |  |  |  | 76,507   |  
|Other long term obligations                                                                                                    |  |         | 19,642   |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  | 19,642   |  
|Deferred tax liabilities(h)                                                                                                    |  |         | 31,744   |   |  |  |  |             |  |  | (1,052   | ) |  |               |  |  |  |  | 30,692   |  
|                                                                                                                               |  |         | 525,862  |   |  |  |  |             |  |  | (921     | ) |  |               |  |  |  |  | 524,941  |  
|Shareholders equity                                                                                                           |  |         |          |   |  |  |  |             |  |  |          |   |  |               |  |  |  |  |          |  
|Common shares (authorized  unlimited number of voting common shares; issued and outstanding  March 31, 2010 
36,049,276)(e) |  |         | 303,505  |   |  |  |  |             |  |  | (3,458   | ) |  |               |  |  |  |  | 300,047  |  
|Additional paid-in capital(c) (h)                                                                                              |  |         | 7,439    |   |  |  |  |             |  |  | (236     | ) |  |               |  |  |  |  | 7,203    |  
|Deficit(a-h)                                                                                                                   |  |         | (129,886 | ) |  |  |  |             |  |  | 1,081    |   |  |               |  |  |  |  | (128,805 | )
|                                                                                                                               |  |         | 181,058  |   |  |  |  |             |  |  | (2,613   | ) |  |               |  |  |  |  | 178,445  |  
|Total liabilities and shareholders equity                                                                                     |  |         | $706,920 |   |  |  |  |             |  |  | $(3,534  | ) |  |               |  |  |  |  | $703,386 |  



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|40 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



The cumulative effect of material differences between US and Canadian GAAP on the consolidated statement of cash flows of the Company is as follows:

Consolidated Statements of Cash Flows  for the year ended March 31, 2011



|                                                                           |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|-------------------------------------------------------------------------- |  | ------- | -------- | - |  |  |  | ----------- |  |  | ------ | - |  | ------------- |  |  |  |  | -------- | -
|                                                                           |  | US GAAP |          |   |  |  |  | Adjustments |  |  |        |   |  | Canadian GAAP | 
|Cash (used in) provided by:                                                |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Operating activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Net loss for the period                                                    |  |         | $(34,650 | ) |  |  |  |             |  |  | $8,964 |   |  |               |  |  |  |  | $(25,686 | )
|Items not affecting cash:                                                  |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Depreciation                                                               |  |         | 39,440   |   |  |  |  |             |  |  | (111   | ) |  |               |  |  |  |  | 39,329   |  
|Equity in loss of unconsolidated joint venture                             |  |         | 2,720    |   |  |  |  |             |  |  | (2,720 | ) |  |               |  |  |  |  |         |  
|Amortization of intangible assets                                          |  |         | 3,540    |   |  |  |  |             |  |  | 706    |   |  |               |  |  |  |  | 4,246    |  
|Amortization of deferred lease inducements                                 |  |         | (107     | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (107     | )
|Amortization of deferred financing costs                                   |  |         | 1,609    |   |  |  |  |             |  |  | (823   | ) |  |               |  |  |  |  | 786      |  
|Amortization of premium on Series 1 Debentures                             |  |         |         |   |  |  |  |             |  |  | (370   | ) |  |               |  |  |  |  | (370     | )
|Loss on disposal of property, plant and equipment                          |  |         | 1,948    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 1,948    |  
|Loss on disposal of assets held for sale                                   |  |         | 825      |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 825      |  
|Realized foreign exchange gain on 83/4% senior notes                       |  |         | (732     | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (732     | )
|Unrealized gain on derivative financial instruments measured at fair value |  |         | (2,305   | ) |  |  |  |             |  |  | (5,802 | ) |  |               |  |  |  |  | (8,107   | )
|Loss on debt extinguishment                                                |  |         | 4,346    |   |  |  |  |             |  |  | (2,884 | ) |  |               |  |  |  |  | 1,462    |  
|Stock-based compensation expense                                           |  |         | 8,156    |   |  |  |  |             |  |  | (1,367 | ) |  |               |  |  |  |  | 6,789    |  
|Accretion of asset retirement obligation                                   |  |         | 35       |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 35       |  
|Deferred income taxes benefit                                              |  |         | (9,340   | ) |  |  |  |             |  |  | 1,688  |   |  |               |  |  |  |  | (7,652   | )
|Net changes in non-cash working capital                                    |  |         | (15,982  | ) |  |  |  |             |  |  | 641    |   |  |               |  |  |  |  | (15,341  | )
|                                                                           |  |         | (497     | ) |  |  |  |             |  |  | (2,078 | ) |  |               |  |  |  |  | (2,575   | )
|Investing activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Acquisition, net of cash acquired                                          |  |         | (23,501  | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (23,501  | )
|Purchase of property, plant and equipment                                  |  |         | (36,417  | ) |  |  |  |             |  |  | (453   | ) |  |               |  |  |  |  | (36,870  | )
|Additions to intangible assets                                             |  |         | (4,748   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (4,748   | )
|Investment in and advances to unconsolidated joint venture                 |  |         | (1,291   | ) |  |  |  |             |  |  | 1,291  |   |  |               |  |  |  |  |         |  
|Proceeds on disposal of property, plant and equipment                      |  |         | 499      |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 499      |  
|Proceeds on disposal of assets held for sale                               |  |         | 826      |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 826      |  
|                                                                           |  |         | (64,632  | ) |  |  |  |             |  |  | 838    |   |  |               |  |  |  |  | (63,794  | )
|Financing activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Repayment of credit facilities                                             |  |         | (85,000  | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (85,000  | )
|Increase in credit facilities                                              |  |         | 128,524  |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 128,524  |  
|Financing costs                                                            |  |         | (7,920   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (7,920   | )
|Redemption of
83/4% senior notes                                           |  |         | (202,410 | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (202,410 | )
|Issuance of Series 1 Debentures                                            |  |         | 225,000  |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 225,000  |  
|Settlement of swap liabilities                                             |  |         | (91,125  | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (91,125  | )
|Proceeds from stock options exercised                                      |  |         | 963      |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 963      |  
|Repayment of capital lease obligations                                     |  |         | (5,127   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (5,127   | )
|                                                                           |  |         | (37,095  | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (37,095  | )
|Decrease in cash and cash equivalents                                      |  |         | (102,224 | ) |  |  |  |             |  |  | (1,240 | ) |  |               |  |  |  |  | (103,464 | )
|Effect of exchange rate on changes in cash                                 |  |         | (59      | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (59      | )
|Cash and cash equivalents, beginning of year                               |  |         | 103,005  |   |  |  |  |             |  |  | 1,240  |   |  |               |  |  |  |  | 104,245  |  
|Cash and cash equivalents, end of year                                     |  |         | $722     |   |  |  |  |             |  |  | $     |   |  |               |  |  |  |  | $722     |  



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 41 | 



---

Consolidated Statements of Cash Flows  for the year ended March 31, 2010



|                                                                           |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|-------------------------------------------------------------------------- |  | ------- | -------- | - |  |  |  | ----------- |  |  | ------ | - |  | ------------- |  |  |  |  | -------- | -
|                                                                           |  | US GAAP |          |   |  |  |  | Adjustments |  |  |        |   |  | Canadian GAAP | 
|Cash provided by (used in):                                                |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Operating activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Net income for the period                                                  |  |         | $28,219  |   |  |  |  |             |  |  | $955   |   |  |               |  |  |  |  | $29,174  |  
|Items not affecting cash:                                                  |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Depreciation                                                               |  |         | 42,636   |   |  |  |  |             |  |  | (124   | ) |  |               |  |  |  |  | 42,512   |  
|Equity in earnings of unconsolidated joint venture                         |  |         | (44      | ) |  |  |  |             |  |  | 44     |   |  |               |  |  |  |  |         |  
|Amortization of intangible assets                                          |  |         | 1,719    |   |  |  |  |             |  |  | 831    |   |  |               |  |  |  |  | 2,550    |  
|Amortization of deferred lease inducements                                 |  |         | (107     | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (107     | )
|Amortization of deferred financing costs                                   |  |         | 3,348    |   |  |  |  |             |  |  | (2,486 | ) |  |               |  |  |  |  | 862      |  
|Loss on disposal of property, plant and equipment                          |  |         | 1,233    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 1,233    |  
|Loss on disposal of assets held for sale                                   |  |         | 373      |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 373      |  
|Unrealized foreign exchange gain on
83/4% senior notes                     |  |         | (48,920  | ) |  |  |  |             |  |  | 496    |   |  |               |  |  |  |  | (48,424  | )
|Unrealized loss on derivative financial instruments measured at fair value |  |         | 38,852   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 38,852   |  
|Stock-based compensation expense                                           |  |         | 5,270    |   |  |  |  |             |  |  | (46    | ) |  |               |  |  |  |  | 5,224    |  
|Cash settlement of stock options                                           |  |         | (244     | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (244     | )
|Accretion of asset retirement obligation                                   |  |         | 5        |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 5        |  
|Deferred income taxes                                                      |  |         | 9,876    |   |  |  |  |             |  |  | 372    |   |  |               |  |  |  |  | 10,248   |  
|Net changes in non-cash working capital                                    |  |         | (39,591  | ) |  |  |  |             |  |  | (1,675 | ) |  |               |  |  |  |  | (41,266  | )
|                                                                           |  |         | 42,625   |   |  |  |  |             |  |  | (1,633 | ) |  |               |  |  |  |  | 40,992   |  
|Investing activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Acquisition, net of cash acquired                                          |  |         | (5,410   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (5,410   | )
|Purchase of property, plant and equipment                                  |  |         | (51,888  | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (51,888  | )
|Additions to intangible assets                                             |  |         | (3,362   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (3,362   | )
|Investment in and advances to unconsolidated joint venture                 |  |         | (2,873   | ) |  |  |  |             |  |  | 2,873  |   |  |               |  |  |  |  |         |  
|Proceeds on disposal of property, plant and equipment                      |  |         | 1,440    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 1,440    |  
|Proceeds on disposal of assets held for sale                               |  |         | 2,482    |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 2,482    |  
|                                                                           |  |         | (59,611  | ) |  |  |  |             |  |  | 2,873  |   |  |               |  |  |  |  | (56,738  | )
|Financing activities:                                                      |  |         |          |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  |          |  
|Repayment of long term debt                                                |  |         | (6,906   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (6,906   | )
|Increase in long term debt                                                 |  |         | 34,700   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 34,700   |  
|Financing costs                                                            |  |         | (1,123   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (1,123   | )
|Proceeds from stock options exercised                                      |  |         | 53       |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 53       |  
|Repayment of capital lease obligations                                     |  |         | (5,613   | ) |  |  |  |             |  |  |       |   |  |               |  |  |  |  | (5,613   | )
|                                                                           |  |         | 21,111   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 21,111   |  
|Increase in cash and cash equivalents                                      |  |         | 4,125    |   |  |  |  |             |  |  | 1,240  |   |  |               |  |  |  |  | 5,365    |  
|Cash and cash equivalents, beginning of year                               |  |         | 98,880   |   |  |  |  |             |  |  |       |   |  |               |  |  |  |  | 98,880   |  
|Cash and cash equivalents, end of year                                     |  |         | $103,005 |   |  |  |  |             |  |  | $1,240 |   |  |               |  |  |  |  | $104,245 |  



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|42 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



Consolidated Statements of Cash Flows  for the year ended March 31, 2009



|                                                                           |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|-------------------------------------------------------------------------- |  | ------- | --------- | - |  |  |  | ----------- |  |  | ------- | - |  | ------------- |  |  |  |  | --------- | -
|                                                                           |  | US GAAP |           |   |  |  |  | Adjustments |  |  |         |   |  | Canadian GAAP | 
|Cash provided by (used in):                                                |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|Operating activities:                                                      |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|Net loss for the period                                                    |  |         | $(135,404 | ) |  |  |  |             |  |  | $(2,473 | ) |  |               |  |  |  |  | $(137,877 | )
|Items not affecting cash:                                                  |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|Depreciation                                                               |  |         | 36,389    |   |  |  |  |             |  |  | (162    | ) |  |               |  |  |  |  | 36,227    |  
|Amortization of intangible assets                                          |  |         | 1,501     |   |  |  |  |             |  |  | 837     |   |  |               |  |  |  |  | 2,338     |  
|Impairment of goodwill                                                     |  |         | 176,200   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 176,200   |  
|Amortization of deferred lease inducements                                 |  |         | (105      | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (105      | )
|Amortization of deferred financing costs                                   |  |         | 2,970     |   |  |  |  |             |  |  | (2,162  | ) |  |               |  |  |  |  | 808       |  
|Loss on disposal of property, plant and equipment                          |  |         | 5,325     |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 5,325     |  
|Loss on disposal of assets held for sale                                   |  |         | 24        |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 24        |  
|Unrealized foreign exchange loss on
83/4% senior notes                     |  |         | 46,466    |   |  |  |  |             |  |  | (606    | ) |  |               |  |  |  |  | 45,860    |  
|Unrealized gain on derivative financial instruments measured at fair value |  |         | (39,921   | ) |  |  |  |             |  |  | 4,655   |   |  |               |  |  |  |  | (35,266   | )
|Stock-based compensation expense                                           |  |         | 2,305     |   |  |  |  |             |  |  | (55     | ) |  |               |  |  |  |  | 2,250     |  
|Accretion of asset retirement obligation                                   |  |         | 155       |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 155       |  
|Deferred income taxes                                                      |  |         | 9,087     |   |  |  |  |             |  |  | (34     | ) |  |               |  |  |  |  | 9,053     |  
|Net changes in non-cash working capital                                    |  |         | 46,193    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 46,193    |  
|                                                                           |  |         | 151,185   |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 151,185   |  
|Investing activities:                                                      |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|Purchase of property, plant and equipment                                  |  |         | (87,102   | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (87,102   | )
|Additions to intangible assets                                             |  |         | (3,102    | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (3,102    | )
|Proceeds on disposal of property, plant and equipment                      |  |         | 11,164    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 11,164    |  
|Proceeds on disposal of assets held for sale                               |  |         | 325       |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 325       |  
|                                                                           |  |         | (78,715   | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (78,715   | )
|Financing activities:                                                      |  |         |           |   |  |  |  |             |  |  |         |   |  |               |  |  |  |  |           |  
|Proceeds from stock options exercised                                      |  |         | 703       |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 703       |  
|Repayment of capital lease obligations                                     |  |         | (6,156    | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (6,156    | )
|                                                                           |  |         | (5,453    | ) |  |  |  |             |  |  |        |   |  |               |  |  |  |  | (5,453    | )
|Increase in cash and cash equivalents                                      |  |         | 67,017    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 67,017    |  
|Cash and cash equivalents, beginning of year                               |  |         | 31,863    |   |  |  |  |             |  |  |        |   |  |               |  |  |  |  | 31,863    |  
|Cash and cash equivalents, end of year                                     |  |         | $98,880   |   |  |  |  |             |  |  | $      |   |  |               |  |  |  |  | $98,880   |  



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 43 | 



---

The areas of material difference between Canadian and US GAAP and their effect on the Companys consolidated
financial statements are described below:

a) Capitalization of interest

US GAAP requires capitalization of interest costs as part of the historical cost of acquiring certain qualifying assets that require a period of time to prepare for their intended use. This is not required
under Canadian GAAP. The capitalized amount is subject to depreciation in accordance with the Companys policies when the asset is placed into service.

b) Financing costs, discounts and premiums

Under US GAAP, deferred financing costs
incurred in connection with the Companys 9.125% Series 1 Debentures and 83/4% senior notes were being amortized over the term of the related debt using the effective interest method. Prior to April 1, 2007, the transaction costs on the 83/4% senior notes were recorded as a deferred asset under Canadian GAAP and these
deferred financing costs were being amortized on a straightline basis over the term of the debt.

Effective
April 1, 2007, the Company adopted CICA Handbook Section 3855, Financial Instruments  Recognition and Measurement, on a retrospective basis without restatement. Although Section 3855 also requires the use of the
effective interest method to account for the amortization of finance costs, the requirement to bifurcate the issuers early prepayment option on issuance of debt (which is not required under US GAAP) resulted in an additional premium of $3,497
on the Series 1 Debentures that is being amortized over the term of the Series 1 Debentures under Canadian GAAP. The same was being done on the extinguished
83/4% senior notes. The unamortized premium is disclosed as
part of the carrying amount of the Series 1 Debentures in the Consolidated Balance Sheets. Foreign denominated transaction costs, discounts and premiums on the 83/4% senior notes were considered as part of the carrying value of the related
financial liability under Canadian GAAP and were subject to foreign currency gains or losses resulting from periodic translation procedures as they were treated as a monetary item under Canadian GAAP. Under US GAAP, foreign denominated
transaction costs are considered nonmonetary and are not subject to foreign currency gains and losses resulting from periodic translation procedures. The unamortized discounts and premiums on the 83/4% senior notes were expensed on the settlement of the 83/4% senior notes under both Canadian and US GAAP with a difference of
$2,884.

In connection with the adoption of Section 3855, transaction costs incurred in connection
with the Companys amended and restated credit agreement of $1,622 were reclassified from deferred financing costs to intangible assets on April 1, 2007 under Canadian GAAP and these costs continued to be amortized on a straightline
basis over the term of the credit facilities. Under US GAAP, the Company continues to amortize these transaction costs over the stated term of the related facilities using the effective interest method. The Company discloses the unamortized
deferred financing costs related to the Series 1 Debentures, the 83/4% senior notes and the credit facilities as Deferred financing costs on the Consolidated Balance Sheets (March 31, 2011  $7,672; March 31, 2010  $6,725) with the amortization charge
classified as Interest expense on the Consolidated Statement of Operations and Comprehensive (Loss) Income. Under Canadian GAAP, the unamortized financing costs related to the Series 1 Debentures (March 31, 2011  $6,165) and the 83/4% senior notes (March 31, 2010  $1,506) are included in
Series 1 Debentures and 83/4% senior
notes respectively whilst the unamortized deferred financing costs in connection with the credit facilities (March 31, 2011  $1,378; March 31, 2010  $1,051) are included in Intangible assets on the Consolidated
Balance Sheets resulting in a Canadian and US GAAP presentation difference.

c) Stockbased compensation

Up until April 1, 2006, the Company followed the provisions of ASC 718, Compensation-Stock Compensation, for US GAAP purposes.
As the Company uses the fair value method of accounting for all stockbased compensation payments under Canadian GAAP, there were no differences between Canadian and US GAAP prior to April 1, 2006. On April 1, 2006, the Company
adopted the provisions of SFAS No. 123(R), ShareBased Payment, which is now a part of ASC 718. As the Company used the minimum value method for purposes of complying with ASC 718, it was required to adopt the provisions under
the revised guidance prospectively. Under Canadian GAAP, the Company was permitted to exclude volatility from the determination of the fair value of stock options granted until the filing of its initial registration statement relating to the initial
public offering of voting shares on July 21, 2006. As a result, for options issued between April 1, 2006 and July 21, 2006, there is a difference between Canadian and US GAAP relating to the determination of the fair value of
options granted.

On September 22, 2010, the Company modified a senior executive employment agreement to allow the option holder the right to settle
options in cash, which resulted in 550,000 stock options changing classification from equity to a long term liability. Under US GAAP, such modification is measured at fair value using a model such as BlackScholes. Under Canadian GAAP,
stock options that are cash settled are measured at the amount by which the quoted market value of the shares of the Companys stock covered by the grant exceeds the option price. This resulted in a measurement difference between US and
Canadian GAAP. At March 31, 2011, the liability under US GAAP was measured at $5,115 of which $2,237 was transferred from additional paid-in capital and the difference of $2,878 was recognized as incremental compensation cost in the
Consolidated Statements of Operations under general and administrative expenses. Under Canadian GAAP, the liability was measured at $3,795 resulting in a transfer of the same amount from additional paid-in capital and the difference of $1,558 was
recognized as incremental compensation cost.



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|44 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



d) Derivative financial instruments

Under Canadian GAAP, the Company determined that the issuers early prepayment option included in the Series 1 Debentures of $3,895 should
be bifurcated from the host contract, along with a contingent embedded derivative liability of $398 in the Series 1 Debentures that provides for accelerated redemption by the holders in certain instances. These embedded derivatives were measured at
fair value at April 7, 2010, the inception date of the Series 1 Debentures with the residual amount of the proceeds being allocated to the debt. Changes in fair value of the embedded derivatives are recognized in net income and the carrying
amount of the Series 1 Debentures is accreted to par value over the term of the Series 1 Debentures using the effective interest method and is recognized as interest expense as discussed in b) above. The same accounting treatment was used on the
extinguished 83/4% senior notes.

Under US GAAP, ASC 815, Derivatives and Hedging, establishes accounting and reporting standards requiring that every derivative
instrument, including certain derivative instruments embedded in other contracts and debt instruments, be recorded on the Balance Sheet as either an asset or liability measured at its fair value. The contingent embedded derivative in the Series 1
Debentures that provides for accelerated redemption by the holders in certain instances did not meet the criteria for bifurcation from the debt contract and separate measurement at fair value and was not bifurcated from the host contract and
measured at fair value resulting in a US GAAP and Canadian GAAP difference. The contingent embedded derivative in the
83/4% senior notes that provide for accelerated redemption by
the holders in certain instances met the criteria for bifurcation from the debt contract and separate measurement at fair value. The embedded derivative in the
83/4% senior notes was measured at fair value and changes in
fair value recorded in net income for all periods presented. The issuers early prepayment option included in both the Series 1 Debentures and the
83/4% senior notes did not meet the criteria as an embedded
derivative under ASC 815 and was not bifurcated from the host contract resulting in a US GAAP and Canadian GAAP difference.

e) NAEPI Series B Preferred Shares

Prior to the modification
of the terms of the NAEPI Series B preferred shares on March 30, 2006, there were no differences between Canadian GAAP and US GAAP related to the NAEPI Series B preferred shares. As a result of the modification of terms of NAEPIs
Series B preferred shares, under Canadian GAAP, NACG continued to classify the NAEPI Series B preferred shares as a liability and was accreting the carrying amount of $42.2 million on the amendment date (March 30, 2006) to their December 31,
2011 redemption value of $69.6 million using the effective interest method. Under US GAAP, NACG recognized the fair value of the amended NAEPI Series B preferred shares as noncontrolling interest as such amount was recognized as temporary
equity in the accounts of NAEPI in accordance with ASC 480-10-599, Distinguishing Liabilities from Equity  SEC Materials and recognized a charge of $3.7 million to retained earnings for the difference between the fair value and the
carrying amount of the Series B preferred shares on the amendment date. Under US GAAP, NACG was accreting the initial fair value of the amended NAEPI Series B preferred shares of $45.9 million recorded on their amendment date (March 30, 2006)
to the December 31, 2011 redemption value of $69.6 million using the effective interest method, which was consistent with the treatment of the NAEPI Series B preferred shares as temporary equity in the financial statements of NAEPI. The
accretion charge was recognized by NACG as a charge to noncontrolling interest (as opposed to retained earnings in the accounts of NAEPI) under US GAAP and interest expense in NACGs financial statements under Canadian GAAP.

On November 28, 2006, NACG exercised a call option to acquire all of the issued and outstanding NAEPI Series B preferred shares in exchange for 7,524,400
common shares of NACG. For Canadian GAAP purposes, NACG recorded the exchange by transferring the carrying value of the NAEPI Series B preferred shares on the exercise date of $44,682 to common shares. For US GAAP purposes, the conversion has
been accounted for as a combination of entities under common control as all of the shareholders of the NAEPI Series B preferred shares are also common shareholders of NACG resulting in the reclassification of the carrying value of the noncontrolling
interest on the exercise date of $48,140 to common shares.

f) Inventories

Effective April 1, 2008, the Company retrospectively adopted CICA Handbook Section 3031, Inventories, without restatement of prior periods. This standard requires inventories to be measured at
the lower of cost and net realizable value and provides guidance on the determination of cost, including the allocation of overheads and other costs to inventories, the requirement for an entity to use a consistent cost formula for inventory of a
similar nature and use, and the reversal of previous write-downs to net realizable value when there are subsequent increases in the value of inventories. This new standard also clarifies that spare component parts that do not qualify for recognition
as property, plant and equipment should be classified as inventory. In adopting this new standard, the Company reversed a tire impairment that was previously recorded at March 31, 2008 in other assets of $1,383 with a corresponding decrease to
opening deficit of $991 net of future taxes of $392.

g) Joint venture

Under US GAAP, the Company records its share of earnings of the JV using the equity method of accounting. Under Canadian GAAP, the Company uses the proportionate consolidation method of accounting for the JV.
Under the proportionate consolidation method the Company recognizes its share of the results of operations, cash flows, and financial position of the JV on a linebyline basis in its consolidated financial statements. While there is no
effect on net income or earnings per share as a result of the US GAAP treatment of the joint venture, as compared to Canadian GAAP, there are



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 45 | 



---

presentation differences affecting the disclosures in the consolidated financial statements and the supporting notes. Under Canadian GAAP, the following assets, liabilities, revenues and expenses
and cash flows would be recorded using the proportionate consolidation method:



|                      |  |               |          |  |  |  |  |               |  |  |        | 
|--------------------- |  | ------------- | -------- |  |  |  |  | ------------- |  |  | ------ | 
|                      |  | March 31,2011 |          |  |  |  |  | March 31,2010 | 
|Current assets        |  |               | $4,164   |  |  |  |  |               |  |  | $4,476 | 
|Long term assets      |  |               |         |  |  |  |  |               |  |  | 77     | 
|Current liabilities   |  |               | 6,937    |  |  |  |  |               |  |  | 1,636  | 
|Long term liabilities |  |               |         |  |  |  |  |               |  |  | 2,970  | 
|Net equity            |  |               | $(2,773) |  |  |  |  |               |  |  | $(53)  | 



|                    |  |      |        |  |  |  |  |      |  |  |        |   |  |      |  |  |  |  |    | 
|------------------- |  | ---- | ------ |  |  |  |  | ---- |  |  | ------ | - |  | ---- |  |  |  |  | -- | 
|Year ended March 31 |  | 2011 |        |  |  |  |  | 2010 |  |  |        |   |  | 2009 | 
|Gross revenues      |  |      | $6,098 |  |  |  |  |      |  |  | $4,336 |   |  |      |  |  |  |  | $ | 
|Gross loss (profit) |  |      | 1,241  |  |  |  |  |      |  |  | (805   | ) |  |      |  |  |  |  |   | 
|Expenses            |  |      | 1,479  |  |  |  |  |      |  |  | 761    |   |  |      |  |  |  |  |   | 
|Net loss (income)   |  |      | $2,720 |  |  |  |  |      |  |  | $(44)  |   |  |      |  |  |  |  | $ | 



|                                                 |  |      |          |  |  |  |  |      |  |  |          |  |  |      |  |  |  |  |    | 
|------------------------------------------------ |  | ---- | -------- |  |  |  |  | ---- |  |  | -------- |  |  | ---- |  |  |  |  | -- | 
|Year ended March 31                              |  | 2011 |          |  |  |  |  | 2010 |  |  |          |  |  | 2009 | 
|Cash flow resulting from operating activities    |  |      | $(2,078) |  |  |  |  |      |  |  | $(1,633) |  |  |      |  |  |  |  | $ | 
|Cash flow resulting from investing activities    |  |      | 838      |  |  |  |  |      |  |  | 2,873    |  |  |      |  |  |  |  |   | 
|(Decrease) increase in cash and cash equivalents |  |      | $(1,240) |  |  |  |  |      |  |  | $1,240   |  |  |      |  |  |  |  | $ | 

h) Other
matters

Other adjustments relate to the tax effect of items (a) through (f) above. The tax effects of temporary differences are described
as future income taxes under Canadian GAAP whereas in these financial statements such amounts are described as deferred income taxes under US GAAP. In addition, Canadian GAAP generally refers to additional paidin capital as contributed surplus
for financial statement presentation purposes.

i) Liquidity Risk

Liquidity risk is the risk that the Company will not be able to meet its financial obligations as they become due. The Company manages liquidity risk through management of its capital structure and financial
leverage, as outlined in note 32(j). It also manages liquidity risk by continuously monitoring actual and projected cash flows to ensure that it will have sufficient liquidity to meet its liabilities when due, under both normal and stressed
conditions, without incurring unacceptable losses or risking damage to the Companys reputation. The Company believes that forecasted cash flows from operating activities, along with amounts available under the Revolving Facility, will provide
sufficient cash requirements to cover the Companys forecasted normal operating and budgeted capital expenditures.

The Companys credit
agreement contain covenants that restrict its activities, including, but not limited to, incurring additional debt, transferring or selling assets and making investments including acquisitions. Under credit agreement, Consolidated Capital
Expenditures, as defined in the revolving credit agreement, during any applicable period cannot exceed 120% of the amount in the capital expenditure plan. In addition, the Company is required to satisfy certain financial covenants, including a
minimum interest coverage ratio and a maximum senior leverage ratio, both of which are calculated using Consolidated EBITDA, as defined in the credit agreement, as well as a minimum current ratio.

As at March 31, 2011, the Company was in violation of certain financial covenants as defined within the credit agreement. On May 20, 2011, the Company
obtained an amendment in connection with such covenants from its lenders resulting in compliance as at March 31, 2011. The Company considers it probable that they will be in compliance with these covenants throughout the fiscal year ending
March 31, 2012.

The following are the undiscounted contractual cash flows of financial liabilities and other contractual cash flows measured at
period end exchange rates:



|                                                                                            |  |                |          |  |  |  |  |                      |      |  |          |  |  |             |      |  |  |  |          |  |      |  |  |  |  |  |        |  |  |  |  |  |                    |  |        |  |  |  |  |  |  |  |        |  |  |  |  |  |  |  |         | 
|------------------------------------------------------------------------------------------- |  | -------------- | -------- |  |  |  |  | -------------------- | ---- |  | -------- |  |  | ----------- | ---- |  |  |  | -------- |  | ---- |  |  |  |  |  | ------ |  |  |  |  |  | ------------------ |  | ------ |  |  |  |  |  |  |  | ------ |  |  |  |  |  |  |  | ------- | 
|                                                                                            |  | CarryingAmount |          |  |  |  |  | ContractualCashFlows |      |  |          |  |  | Fiscal year |     
|                                                                                            |  |                |          |  |  |  |  |                      | 2012 |  |          |  |  |             | 2013 |  |  |  |          |  | 2014 |  |  |  |  |  | 2015   |  |  |  |  |  | 2016 andThereafter | 
|Accounts payable and accrued liabilities (excluding liabilities related to equipment lease) |  |                | $104,159 |  |  |  |  |                      |      |  | $104,159 |  |  |             |      |  |  |  | $104,159 |  |      |  |  |  |  |  | $     |  |  |  |  |  |                    |  | $     |  |  |  |  |  |  |  | $     |  |  |  |  |  |  |  | $      | 
|Liabilities related to equipment lease                                                      |  |                | 20,265   |  |  |  |  |                      |      |  | 20,265   |  |  |             |      |  |  |  | 7,518    |  |      |  |  |  |  |  | 5,345  |  |  |  |  |  |                    |  | 3,657  |  |  |  |  |  |  |  | 3,726  |  |  |  |  |  |  |  | 19      | 
|Capital lease obligations (including interest)                                              |  |                | 8,693    |  |  |  |  |                      |      |  | 9,257    |  |  |             |      |  |  |  | 5,267    |  |      |  |  |  |  |  | 3,087  |  |  |  |  |  |                    |  | 562    |  |  |  |  |  |  |  | 270    |  |  |  |  |  |  |  | 71      | 
|Term facilities                                                                             |  |                | 68,446   |  |  |  |  |                      |      |  | 68,446   |  |  |             |      |  |  |  | 10,000   |  |      |  |  |  |  |  | 10,000 |  |  |  |  |  |                    |  | 48,446 |  |  |  |  |  |  |  |       |  |  |  |  |  |  |  |        | 
|Revolving facility                                                                          |  |                | 3,524    |  |  |  |  |                      |      |  | 3,524    |  |  |             |      |  |  |  |         |  |      |  |  |  |  |  |       |  |  |  |  |  |                    |  | 3,524  |  |  |  |  |  |  |  |       |  |  |  |  |  |  |  |        | 
|Series 1 Debentures                                                                         |  |                | 225,000  |  |  |  |  |                      |      |  | 225,000  |  |  |             |      |  |  |  |         |  |      |  |  |  |  |  |       |  |  |  |  |  |                    |  |       |  |  |  |  |  |  |  |       |  |  |  |  |  |  |  | 225,000 | 
|Accrued interest on Series 1 Debentures                                                     |  |                | 9,866    |  |  |  |  |                      |      |  | 102,656  |  |  |             |      |  |  |  | 20,531   |  |      |  |  |  |  |  | 20,531 |  |  |  |  |  |                    |  | 20,531 |  |  |  |  |  |  |  | 20,531 |  |  |  |  |  |  |  | 20,531  | 



|   |  |           |  |                   
|-- |  | --------- |  | ------------------
|46 |  | |    NOA| |  | 2011 Annual Report



---

NAEP



j) Capital disclosures

The Companys
objectives in managing capital are to help ensure sufficient liquidity to pursue its strategy of organic growth combined with strategic acquisitions and to provide returns to its shareholders. The Company defines capital that it manages as the
aggregate of its shareholders equity, which is comprised of issued capital, additional paid-in capital, accumulated other comprehensive income (loss). The Company manages its capital structure and makes adjustments to it in light of general
economic conditions, the risk characteristics of the underlying assets and the Companys working capital requirements. In order to maintain or adjust its capital structure, the Company, upon approval from its Board of Directors, may issue or
repay long term debt, issue shares, repurchase shares through a normal course issuer bid, pay dividends or undertake other activities as deemed appropriate under the specific circumstances. The Board of Directors reviews and approves any material
transactions out of the ordinary course of business, including proposals on acquisitions or other major investments or divestitures, as well as capital and operating budgets.

The Company monitors debt leverage ratios as part of the management of liquidity and shareholders return and to sustain future development of the business. The Company is also subject to externally imposed
capital requirements under its Credit Facilities and indenture agreement governing the 9.125% Series 1 Debentures, which contain certain restrictive covenants including, but not limited to, incurring additional debt, transferring or selling assets,
making investments including acquisitions or to pay dividends or redeem shares of capital stock. As at March 31, 2011, the Company was in violation of certain financial covenants as defined within the credit agreement. On May 20, 2011, the
Company obtained an amendment in connection with such covenants from its lenders resulting in compliance as at March 31, 2011. The Company considers it probable that they will be in compliance with these covenants throughout the fiscal year ending
March 31, 2012. The Companys overall strategy with respect to capital risk management remains unchanged from the year ended March 31, 2010.

In September 2009, the Company filed a base shelf prospectus covering the public offering of common shares in each of the provinces and territories of Canada and a related registration statement with the United
States Securities and Exchange Commission. These filings allow the Company to offer and issue common shares to the public by way of one or more prospectus supplements at any time during the 25 month period following the filing of the prospectus with
gross proceeds to the Company not to exceed $150.0 million. The prospectus also allows certain shareholders of the Company to offer all or part of their common shares to the public by way of one or more prospectus supplements.



|                   |  |           |  |  |    | 
|------------------ |  | --------- |  |  | -- | 
|2011 Annual Report |  | |    NOA| |  |  | 47 |