29 CFR §102.175

1. (a)The Agency official responsible for collection of the debt will consider any evidence submitted by the debtor as a result of the notification required by § 102.174 and notify the debtor of the result. If appropriate, the debtor will also be advised where and to whom to request a review of any unresolved dispute.
2. (b)The debtor will be granted 30 days from the date of the notification required by paragraph (a) of this section to request a review of the determination of the Agency official responsible for collection of the debt on any unresolved dispute. The debtor will be advised of the result.