What is the cost of an assessment of costs under Rule 140(3) of the Rules of Civil Procedure?

Circumstances have prompted notice of an assessment of costs further to Rule 140(3): see Machula v. Canada, [2008] F.C.J. No. 103, 2008 D.T.C. 6095 (A.O.) and Rutledge v. Canada, [2006] F.C.J. No. 328, 2006 D.T.C. 6141 (A.O.). Here, having regard to Rule 140(3) which provides that where “a party has no known address at the time of service, a document that is not required to be personally served may be served by depositing the document at the office of the Registry where the proceeding was initiated,” I directed the Registry to post a letter setting out the timetable for the service and filing of materials by the respective parties, together with a copy of the Defendant’s materials, and instructions for its retrieval, on the public notice board in the Vancouver office of the Registry.