Pima County Community College District ("College") is seeking proposals from qualified firms to provide Chartered Ground Transportation Services. Pima County Community College District ("College") is seeking proposals from qualified firms to provide Digital Marketing Services.Required Submittal Forms. The cover letter should express the firm's interest and serve as an executive summary of the proposal. In this article, we discuss how to write a business proposal letter and we offer sample letters and templates you can use as a guide. Complete and submit a signed Business Associate Agreement via Proposal Technologies. This form and all attachments must be submitted as a part of your proposal.) 1. ROMA style for purposes of proposal evaluation. Claims of proprietary information must be included in the cover letter. 2. Designation must be included in the Table of Contents or cover letter in the Proposal documents.