At least two (2) competitive prices shall be solicited. When feasible, quotations or bids shall be based on plans and specifications. Competition shall be upon common merchandise, conditions or services so as to foster the competition. Purchase orders shall be used for all purchases where practical and must be authorized and signed by the chief purchasing agent in compliance with this chapter. All quotations shall be kept on file for a period of at least one year after receipt thereof. (Ord. 1997-1, 2-3-1997; amd. 2005 Code)