12.2. Failing an agreement with the permit holder within ninety days following the delivery of the specifications, the board may call for tenders.
The board shall, within thirty days after the opening of tenders, negotiate again with the permit holder after notifying all the tenderers in writing and make the contract with the holder if he agrees to execute the contract at the price of the lowest tender or at a lower price.
No changes may be made to the specifications for the purposes of the call for tenders or the negotiation.