Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. The document provides a sample business letter format with enclosure that can be used as a template for professional correspondence.INTRODUCTION: The City of Riverside Public Works Department requires. In both cases, use the frame as a template and drill through the holes in the frame for the expansion anchors. Thank you to our professional staff whose talent and dedication kept Riverside Park thriving this year. Donate to support them. Download forms for full functionality. Your review of the written examination will be conducted in accordance with the procedures specified in Enclosure 4, "Facility Review of Written Examinations.". Instruction Guide Follows. Used for estimated saving to aid in filling out Ten-Year Rehabilitation Plan. INCOME.