Bids may be modified or withdrawn by written notice or in person by a bidder if the request is received prior to the exact hour and date set for the bid opening. Requests for withdrawals or modifications of bids received after the bid opening will not be considered except as otherwise provided in the following paragraph.
Withdrawal of erroneous bids after opening, but before award, because of bid mistakes will be permitted by the determination of the contracting officer when the bidder requests relief and presents credible evidence that the reason for the lower bid price was a clerical mistake as opposed to a judgment mistake and was actually due to an unintentional arithmetical error or an unintentional omission of a substantial quantity of work, labor, material, or services made directly in the compilation of the bid. Request for relief and supporting evidence to withdraw the bid must be made in writing to the contracting officer within two business days after opening the bids.