After staff review, the Chair may deem minor certain amendments or corrections of previously approved applications, including changes to an approved plan or resolution, provided that such amendments, changes, or corrections substantially comply with the Board's previous approval, and the findings under which such approval was made are not affected by such amendments or corrections. Such amendments or corrections may be approved by the Chair by letter. A request for a letter approval must be made in writing explaining the changes or corrections and accompanied by all relevant information including previously approved drawings and resolution(s) and proposed drawings and resolution changes.