(1) If the original bidder neglects, fails, or refuses for 15 days after the notice of award to enter into the contract, then the city council, without further proceedings, shall again advertise for proposals or bids as in the first instance and award the contract for said work to the then-lowest regular bidder.
(2) Should no bids be received in response to the call for proposals, the council may again advertise for bids under the same proceedings at any time within 6 months from the time set for the last reception of bids and let the contract to the then-lowest bidder. Such delay shall in no way affect the validity of any of the proceedings or assessments levied thereunder.