Each bidder to do filling-in work on a lot must accompany his or her bid with a certified check on some responsible bank in a sum equal to twenty-five (25) percent of his or her bid, which check must be payable to the order of the city, and which check shall be forfeited, if his or her bid be accepted, in case he or she fails to give bonds for the completion of the work in accordance with his or her bid and the notice to bidders. A deposit of money of like amount may be made in lieu of a check, which shall be forfeited in like manner. Upon the presentation and approval by the city of a proper bond, the check or money, as the case may be, shall be returned. (Prior code § 21.04.023)