The U.S. House is scheduled to vote Wednesday or Thursday on a proposed parking cap for the Mark Center.

The amendment proposed by Virginia Rep. James P. Moran Jr. (D) states only 1,000 parking spaces be used until a new environmental study is completed for the Mark Center site or all road construction is completed. The amendment is part of the Defense Authorization bill.

Some 6,400 employees are scheduled to move into the Mark Center site, at Interstate 395 and Seminary Road, by Sep. 15 as part of the Base Realignment and Closure (BRAC) plan.

The parking cap amendment is among several that are scheduled for a vote Wednesday night, but could be pushed to tomorrow, said Anne Hughes, a Moran spokeswoman.

The full bill includes an option for Secretary of Defense Robert Gates to delay the move-in dates for several locations, including the Mark Center, by one year to allow for road construction and other improvements. The House is expected to vote on the full bill by Thursday, Hughes said.

The bill would still need to go to the Senate.