Yes. We do not have a restriction on stipends to volunteers. You may include stipends for interns in the budget under direct expenses and you may count them as volunteers.
This project #90CCDG0002 is supported by the Administration for Community Living (ACL), U.S. Department of Health and Human Services (HHS) as part of a financial assistance award totaling $10,364,463 with 75 percent funded by ACL/HHS and $3,458,052 or 25 percent funded by non-government source(s). The contents are those of the author(s) and do not necessarily represent the official views of, nor an endorsement, by ACL/HHS, or the U.S. Government.