After months of discussion and one 30-day extension of Loudoun County’s deadline to opt in to phase two development of Metro’s Silver Line, three Loudoun County supervisors are now pushing for an additional deadline extension — to December 1. 

Work continues on the Washington Metropolitan Area Transit Authority (WMATA) Silver Line project on Thursday, May 10, 2012. (Nikki Kahn/The Washington Post)

Loudoun currently faces a July 4 deadline to decide whether to continue to stay involved in the project.

The supervisors’ list of “additional agreement terms for consideration” includes a number of requests of the Metropolitan Washington Airports Authority (MWAA) and the Washington Metropolitan Area Transit Authority (WMATA) — including that MWAA establish a permanent Inspector General’s position to oversee all of its operations, and that WMATA and MWAA agree to have the unanimous approval of all jurisdictions in the compact, not just among their own boards, — before committing to any capital expenditures.

The list also seeks additional state funding to offset tolls on the Dulles Toll Road, and aims to guarantee that cost overruns will not be Loudoun’s financial responsibility.

The request to delay Loudoun’s deadline decision until December 1 was among the list’s most significant items. The five-month extension, the memorandum said, would allow the county more time to identify a specific funding strategy for the project and receive public input on the plan.

“We believe that if MWAA, Fairfax County, and WMATA truly want to partner with Loudoun County on this project, they will take the time to work through the construction and funding details on this project,” the memo said. “This is not much to ask for in return for a lifetime of commitment from our citizens.”

The Board of Supervisors decided Monday to hold one additional work session to address financing options for the project prior to the July 4 deadline. As of Tuesday, the meeting had not yet been scheduled.