A. Sole Source. When in the opinion of the purchasing officer goods and supplies, equipment, materials, or proprietary services are unique, available only from one source, or are sought to match existing goods already in use, then a sole source procurement may be used;

B. No Bids Received. When after a reasonable attempt has been made to obtain informal bids or proposals, and it has been determined by the purchasing officer that three bids or proposals cannot be obtained;

C. Emergency Purchases. When the purchasing officer finds that emergency conditions require the immediate purchase of goods and supplies, equipment, materials, or services; the purchasing officer shall file promptly with the city council a certificate showing that emergency conditions existed and created the necessity for such action, together with an itemized account of all expenditures;

D. Obtaining Lowest Price. When in the opinion of the purchasing officer formal bidding is not likely to result in the lowest price and that no competitive advantage can be gained by soliciting bids. However, under such circumstances compliance with the informal procedures set forth in Section 3.16.110 shall be required;

E. Piggyback or Awarded Competitive Bid. When in the opinion of the purchasing officer the goods and supplies, equipment, materials, or nonprofessional services are available from a vendor who has been selected as the lowest bidder within the prior six months by another public agency using competitive bidding procedures substantially the same as or similar to those normally utilized by the town for the acquisition of such supplies or services, and when the price offered to the town is substantially equivalent to that offered to the other public agency;

F. Cooperative-Type (State Contract) Bids. When in the opinion of the purchasing officer the goods and supplies, equipment, materials, or nonprofessional services are available from a vendor who has been selected as the lowest bidder through a cooperative-type agreement with another government entity using competitive bidding procedures substantially the same as or similar to those normally utilized by the town for the acquisition of such supplies or services, and when the price offered to the town is substantially equivalent to that offered to the other public agency. (Ord. 595 § 1 (Exh. A (part)), 2012)