EXHIBIT 99.9
                                                                  ------------


                               LETTER OF CONSENT

TO:      United States Securities and Exchange Commission

RE:      ARC ENERGY TRUST - ANNUAL REPORT ON FORM 40-F

We hereby  consent to the use and  reference  to our name and our report dated
February 23, 2006  evaluating  ARC Energy  Trust's  petroleum  and natural gas
reserves as at December  31, 2005,  as described in the Annual  Report on Form
40-F of ARC Energy  Trust for the fiscal  year ended  December  31, 2005 filed
with the United  States  Securities  and Exchange  Commission  pursuant to the
SECURITIES EXCHANGE ACT OF 1934, as amended, and the inclusions of information
derived from our report.

                                               Sincerely,

                                               GLJ PETROLEUM CONSULTANTS LTD.

                                               /s/ James H. Willmon, P.Eng.
                                               ------------------------------
                                               James H. Willmon, P. Eng.
                                               Vice-President


Calgary, Alberta
Date:  March 29, 2006