Set an email rule to forward review request to someone else in your office.
Most, if not all, email clients (eg. Microsoft Outlook or Lotus Notes) allow you to set up email rules that automatically process incoming email messages.
You could set a rule that checks the subject line of incoming messages when they arrive for the phrase "New Task Assigned - Department Review" and forwards that to someone in your office. (Example shown is Microsoft Outlook.)
That person would then simply call the Project Coordinator (Planner) and ask to be added to the project to complete the review in your absense.
Remember to turn off the rule when you get back in the office.