The deadline for the submission of LOP request is April 30, 2020. Steps to take: â–« Complete a Request for Letter of Permission form and the Letter of Permission.Mention your name and a short description of who you are. Mention in the letter who are you authorizing to claim the money. This article will explain the authorization letter format and also give you authorization letter samples for your reference. Intheblanks form authorizing an individual filing agent to efile documents on behalf of a single attorney. Download and complete the appropriate King County construction dewatering application from the KCIW Construction dewatering webpage. Instructions for completing the Third Party Letter of Authorization (LOA). Need help downloading or filling forms? To sign up for MyChart, contact your physician's office and request your special access letter.