A new parking garage at the Twinbrook Metro station has "extensive cracks" and will need to be repaired before Metro accepts the work from its contractor.

Metro has been trying get the contractor for the 426-space garage to fix the problems for several months, the transit agency said in documents prepared for its board committee meetings scheduled for Thursday. The contractor has agreed to make the repairs as well as give Metro a 10-year warranty on the work.

The problems are pushing back Metro's development deadlines at the Twinbrook station, a project that will provide more than 200 apartments and 33,000 square feet of retail space.

Metro spokesman Dan Stessel said the problems with the garage are not comparable to the flaws in the Silver Spring Transit Center, which officials said was so dangerous that buses could fall through the uneven concrete floors.

"[This is] not comparable to the [Silver Spring Transit Center] project -- they are separate and distinct in design, construction and use," Stessel said in an email. "At Twinbrook, we have identified issues with the construction of the replacement garage, which is the responsibility of the developer. Technical review of corrective plan is still underway; however, given the nature of the structure and conditions of the cracking evidenced to date, a solution appears achievable."