Step 1: Complete the Approval Request Cover Sheet and compile supporting documents. Fill Out the Date of the Letter: Clearly state the date of the application approval letter. 3.Thank you for submitting Massachusetts' 20182020 §303(d) list of water quality limited segments (WQLSs) on January 5, 2021. Learn how to write a professional Request for Approval Letter to seek permission or consent for proposals, actions, or decisions effectively and formally.