SB5037 – Would require Sound Transit to get additional voter approval if the cost to complete the expansion plan approved in 2016 increases beyond $54 Billion; if any projects are added or subtracted; or if there are any significant changes in the scope of the project from the approved plan.
Prime Sponsor – Senator O’Ban (R, 24th District, Southern Pierce County)
Current status – Referred to Transportation Committee. Still in committee by 2019 cutoff; reintroduced and retained in present status for 2020 session.
Next step would be – Scheduling a hearing.
Legislative tracking page for the bill.

Comments:
This would make additional votes very likely. Here’s the results of the 2016 vote, compared with the boundaries of Senator O’Ban’s district. (The green areas at the bottom of the voting results map are the military bases in the southwest area of the district.)

Details:
Requires an independent audit when 80% of the voted funding has been used, and another vote if the audit concludes the original plan cannot be completed with the remaining original funding, as well as a vote for additions or deletions of projects, or for “significant” changes in scope.