(1) All material and work required by a port district not meeting the definition of public work in RCW 39.04.010(4) may be procured in the open market or by contract and all work ordered may be done by contract or day labor.

(2)(a) All such contracts for work meeting the definition of "public work" in RCW 39.04.010(4), the estimated cost of which exceeds ((three hundred thousand dollars))the cost thresholds established in RCW 39.04.155, shall be awarded using a competitive bid process. The contract must be awarded at public bidding upon notice published in a newspaper of general circulation in the district at least thirteen days before the last date upon which bids will be received, calling for bids upon the work, plans and specifications for which shall then be on file in the office of the commission for public inspection. The same notice may call for bids on such work or material based upon plans and specifications submitted by the bidder. The competitive bidding requirements for purchases or public works may be waived pursuant to RCW 39.04.280 if an exemption contained within that section applies to the purchase or public work.

(b) For all contracts related to work meeting the definition of "public work" in RCW 39.04.010(4) ((that are estimated at three hundred thousand dollars or less)), the estimated cost of which do not exceed the cost thresholds established in RCW 39.04.155, a port district may let contracts using the small works roster process under RCW 39.04.155 in lieu of advertising for bids. Whenever possible, the managing official shall invite at least one proposal from a minority contractor who shall otherwise qualify under this section.

When awarding such a contract for work, when utilizing proposals from the small works roster, the managing official shall give weight to the contractor submitting the lowest and best proposal, and whenever it would not violate the public interest, such contracts shall be distributed equally among contractors, including minority contractors, on the small works roster.

(c) Any port district may construct any public work, as defined in RCW 39.04.010, by contract without calling for bids whenever the estimated cost of the work or improvement, including cost of materials, supplies, and equipment, will not exceed the sum of forty thousand dollars. A "public works project" means a complete project. The restrictions in this subsection do not permit the division of the project into units of work or classes of work to avoid calling for bids. The port district managing official shall make his or her best effort to reach out to qualified contractors, including certified minority and woman-owned contractors.

(3)(a) A port district may procure public works with a unit priced contract under this section or RCW 39.04.010(2) for the purpose of completing anticipated types of work based on hourly rates or unit pricing for one or more categories of work or trades.

(b) For the purposes of this section, unit priced contract means a competitively bid contract in which public works are anticipated on a recurring basis to meet the business or operational needs of a port district, under which the contractor agrees to a fixed period indefinite quantity delivery of work, at a defined unit price, for each category of work.

(c) Unit priced contracts must be executed for an initial contract term not to exceed three years, with the port district having the option of extending or renewing the unit priced contract for one additional year.

(d) Invitations for unit priced bids shall include, for purposes of the bid evaluation, estimated quantities of the anticipated types of work or trades, and specify how the port district will issue or release work assignments, work orders, or task authorizations pursuant to a unit priced contract for projects, tasks, or other work based on the hourly rates or unit prices bid by the contractor. Contracts must be awarded to the lowest responsible bidder as per RCW 39.04.010. Whenever possible, the port district must invite at least one proposal from a minority or woman contractor who otherwise qualifies under this section.

(e) Unit priced contractors shall pay prevailing wages for all work that would otherwise be subject to the requirements of chapter 39.12 RCW. Prevailing wages for all work performed pursuant to each work order must be the prevailing wage rates in effect at the beginning date for each contract year. Unit priced contracts shall have prevailing wage rates updated annually. Intents and affidavits for prevailing wages paid shall be submitted annually for all work completed within the previous twelve-month period of the unit priced contract.