The report also recommends LEDs be installed in the reflecting pool, where neon lights originally were installed.
The reflecting pool also is showing signs of deterioration, engineers found. The water line between the memorial's pump room and the pool is faulty, and its automatic fill system is not functional.
Pipes for the pool's filtration system also are faulty. Engineers said the current vacuum filtration system is "ineffective at best and does not circulate the water in a manner which prevents the growth of algae and bacteria."
The report recommends replacing the pipes and installing an automatic pool vacuum.
Engineers recommended "a more conservative approach" to problems with the masonry. They said the state should refurbish the existing stone rather than replace it.
"We feel that the unintended and unanticipated consequences of a well-intentioned intervention are very often regrettable but the scars are permanent," the report said.
The report recommends replacing some of the cracked granite pavers inside the monument, and resealing failed masonry joints. Wall surfaces should be buffered and polished, and then cleaned with a gentle chemical wash.
Some damages were caused by human error. Lawnmowers have scraped the exterior limestone walls, which are now "scuffed and gouged." Engineers recommended placing paving stones between the walls and the lawn to prevent further damage.
Grounds workers also should stop using salt to melt ice on the monument's walkways, the report recommended.
Department of Administration spokeswoman Diane Holley-Brown said the state's General Services Division, which maintains the Capitol grounds, is currently reviewing the report with the Mills Group to decide what actions it will take in repairing the monument.
Brown said there is no set timeline for the renovations but said work could begin later this year. The state would have to bid out a contract for construction, however.
"Just like any project, we have the design contract and then we have the construction contract," she said.
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