Delivery pursuant to RCW 34.05.542(4) shall be deemed to have been made when a copy of the petition for judicial review has been received by the public employees benefits board (PEBB) appeals unit at Cherry Street Plaza, 626 8th Avenue S.E., Olympia, WA 98501 or received by mail at the PEBB appeals unit, P.O. Box 45504, Olympia, WA 98504-5504.