You're gonna need to get a number of support letters from key stakeholders, and EPA Reviewers will read them and will likely call the citizen/organization to confirm their ROLE. If a support letter is boilerplate, with font size changes for the phrase where organization's name and role are identified, and reads just like the other letters, you're gonna get dinged. Each support letter should be specific.
From the Guidelines - "Provide a description of, and role of, the key community-based organizations involved in your project. These organizations may include, but are not limited to, local citizen or business groups, environmental or civic organizations, educational institutions, and local labor organizations. [Note: Community-based organizations do not include local government departments, the local planning department/district/office, local contractors, the mayor’s office, or other elected officials.] If Community-based organizations do not exist in your area, please provide background affirming the lack of such organizations. Then, demonstrate how the community is engaged and involved in your project, which can be demonstrated by resident support letters, letters to the editor, attendance at public meetings, etc. Attach letters from all community-based organizations mentioned that describe their roles and affirm any referenced commitments."
Good Luck!