The estimated cost of repairing cracks and other structural problems in the Washington Monument caused by the Aug. 23 earthquake is at least $15 million, the National Park Service has concluded, NPS will pay half the cost, while the rest will be raised by the Trust for the National Mall, the Park Service’s non-profit entity.

According to a 35-page report released Dec. 22, the monument cracked in dozens of places and six marble panels near the top of the structure are so severely damaged that water was leaking through to the observation areas as a result of the Aug. 23 temblor.

“This assessment gives us the information we needed to determine how to go about repairing this iconic structure,” said Bob Vogel, superintendent for the Mall told The Washington Times.

The survey did not include a time frame to complete the project nor a final cost estimate.

The report was prepared by government contractors Wiss, Janney, Elstner Associates, Inc. and Tipping Mar, which did the original assessment of the damage and has won the contract to make the repairs and make the monument better able to withstand future earthquakes.

The assessment was conducted over nearly two months, including several days in which a four-member team of structural engineers rappelled the 555-foot national icon monument for an up-close look at the damage.