Unless, within 30 days after the date of the above final determination, the Grant recipient submits a written appeal of the final determination, including a written justification of the reason for the appeal, and supporting documentation for any disputed costs of the final determination, the final determination of allowable costs will become the final allowable costs for purposes of ARPA RWAI Grant payments and the Grant agreement, and the Grant recipient shall receive a final determination letter from the department.
15 Miss. Code. R. 20-72-5.3.20.3