**Exhibit 99.4**

 

**Certification required by Rule 13a-14(a) or15d-14**

**of the Securities Exchange Act of1934, as adopted**

**pursuant to Section 302 ofthe Sarbanes-Oxley Act of 2002**

 

**CERTIFICATIONS**

 

I, JohnP. Dielwart, certify that:

 
| 1.     | I have reviewed this annual report on Form 40-F  of ARC Energy Trust;                                                                                                                                                                                                                                                                                                      |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| 2.     | Based on my knowledge, this report does not contain  any untrue statement of a material fact or omit to state a material fact  necessary to make the statements made, in light of the circumstances under  which such statements were made, not misleading with respect to the period  covered by this report;                                                                  |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| 3.     | Based on my knowledge, the financial statements, and  other financial information included in this report, fairly present in all  material respects the financial condition, results of operations and cash  flows of the issuer as of, and for, the periods presented in this report;                                                                                          |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| 4.     | The issuer’s other certifying officer and I are  responsible for establishing and maintaining disclosure controls and  procedures (as defined in Exchange Act Rules 13a-15(e) and  15d-15(e)) and internal control over financial reporting (as defined in  Exchange Act Rules 13a-15(f) and 15d-15(f)) for the issuer and  have:                      |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (a)    | Designed such disclosure controls and procedures, or  caused such disclosure controls and procedures to be designed under our  supervision, to ensure that material information relating to the issuer,  including its consolidated subsidiaries, is made known to us by others within  those entities, particularly during the period in which this report is being  prepared; |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (b)    | Designed such internal control over financial  reporting, or caused such internal control over financial reporting to be  designed under our supervision, 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;    |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (c)    | Evaluated the effectiveness of the issuer’s  disclosure controls and procedures and presented in this report our  conclusions about the effectiveness of the disclosure controls and  procedures, as of the end of the period covered by this report based on such  evaluation; and                                                                                        |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (d)    | Disclosed in this report any change in the issuer’s  internal control over financial reporting that occurred during the period  covered by the annual report that has materially affected, or is reasonably  likely to materially affect, the issuer’s internal control over financial  reporting; and                                                                |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| 5.     | The issuer’s other certifying officer and I have  disclosed, based on our most recent evaluation of internal control over  financial reporting, to the issuer’s auditors and the audit committee of the  issuer’s board of directors (or persons performing the equivalent functions):                                                                           |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (a)    | All significant deficiencies and material weaknesses  in the design or operation of internal control over financial reporting which  are reasonably likely to adversely affect the issuer’s ability to record,  process, summarize and report financial information; and                                                                                                   |
|   |                                                                                                                                                                                                                                                                                                                                                                            |
| (b)    | Any fraud, whether or not material, that involves  management or other employees who have a significant role in the issuer’s  internal control over financial reporting.                                                                                                                                                                                                   |

 

Date: March 26, 2009

 

 
| signed *“John P. Dielwart”* |   |
|---------------------------------------|--------|
| John P. Dielwart                      |   |
| Chief Executive Officer               |   |

 

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