§ 2030. Contracts. All contracts, or orders, for work, material or supplies performed or furnished in connection with construction shall be awarded by the authority pursuant to resolution. Such contracts, or orders, for work, material or supplies needed for any particular purpose involving an expenditure of more than two thousand five hundred dollars shall be awarded only after inviting sealed bids or proposals therefor. The notice inviting sealed proposals shall be published at least once in a newspaper or trade paper selected by the authority for such purpose, such publication to the be at least ten days before the date for the receipt of bids. If the authority shall not deem it for the interest of the authority to reject all bids, it shall award the contract to the lowest bidder, unless the authority shall determine that it is for the public interest that a bid other than the lowest bid should be accepted. In any contract for work, material or supplies, there shall be inserted in the discretion of the authority a provision that additional work may be done or material or supplies furnished for the purpose of completing such contract at an expense not exceeding fifteen per centum of the amount of such contract if such additional work, materials or supplies shall be ordered by the authority. The bidder whose bid is accepted shall give security for the faithful performance of the contract, and such other security as the authority may require, and may be required to maintain for such period as shall be stipulated any construction done under the contract, all in the manner prescribed and required by the authority; and the sufficiency of such security shall, in addition to the justification and acknowledgment, be approved by the authority. All bids or proposals shall be publicly opened by the authority or its duly authorized agent. If the bidder whose bid has been accepted after advertising shall neglect or refuse to accept the contract within five days after written notice that the same has been awarded to him on his bid or proposal, or, if he accepts but does not execute the contract and give proper security the authority shall have the right to declare his deposit forfeited, and thereupon it shall be readvertised and relet as above provided. In case any work shall be abandoned by any contractor, the authority may, if the best interest of the authority be thereby served, adopt on behalf of the authority any or all subcontracts made by such contractor for such work and all such subcontractors shall be bound by such adoption if made; and the authority shall in the manner provided herein readvertise and relet the work specified in the original contract exclusive of so much thereof as shall be provided for in the subcontract or subcontracts so adopted. No bid shall be accepted from or any contracts awarded to, any person or corporation who is in arrears to the authority, or the county of Onondaga upon any debt or contract, or is a defaulter as surety or otherwise upon any obligation of the authority, or the county. Every contract involving an expenditure of more than two thousand five hundred dollars when made and entered into as herein provided for shall be executed in duplicate, one copy of which shall be held by the authority and one copy of which shall be delivered to the contractor.