PCC §20155.4: (a) A best value contractor shall not be prequalified or shortlisted unless the contractor provides an enforceable commitment to the county that the contractor and its subcontractors at every tier wil

(a) A best value contractor shall not be prequalified or shortlisted unless the contractor provides an enforceable commitment to the county that the contractor and its subcontractors at every tier will use a skilled and trained workforce to perform all work on the project or contract that falls within an apprenticeable occupation in the building and construction trades, in accordance with Chapter 2.9 (commencing with Section 2600) of Part 1. (b) This section shall not apply if any of the following requirements are met: (1) The county has entered into a project labor agreement that will bind all contractors and subcontractors performing work on the project or contract to use a skilled and trained workforce, and the contractor agrees to be bound by that project labor agreement. (2) The project or contract is being performed under the extension or renewal of a project labor agreement that was entered into by the county prior to January 1, 2017. (3) The contractor has entered into a project labor agreement that will bind the contractor and all its subcontractors at every tier performing the project or contract to use a skilled and trained workforce. (c) For purposes of this section, “project labor agreement” has the same meaning as in paragraph (1) of subdivision (b) of Section 2500.