But during the public comment part of the lengthy meeting, residents also made it clear that they had problems with the museum and the accompanying hotel and conference center.
Colleen Eckman, who said she lives in "close proximity" to the site, would prefer the land be kept open.
"I'm not demeaning the American Revolution Center - just the site," she said. "It should not have a museum or a conference center."
Also Thursday, supervisors announced that they would be unveiling a new zoning ordinance for the project next week, with a public hearing set for Sept. 6.
The original ordinance created a public outcry from residents and others, including the National Park Service, the Sierra Club, and the National Parks Conservation Association.
Critics had argued that the ordinance would have permitted paving over about 70 percent of the site, preventing further archaeological study where Washington's first commissary was set up. Supervisor Chairman Craig Dininny said Thursday that those criticisms unfairly distorted the ordinance.
The proposed site of the project is a 78-acre tract on Pawlings Road now owned by the Archdiocese of Philadelphia. It's within the boundaries of Valley Forge, but across the Schuylkill from the park's key attractions.
The archdiocese is selling 125 acres for $7.1 million to the center and to Montgomery County and the township for open space and recreation.
The center's plans call for the construction of a three-story, 130,000-square-foot museum built with the latest in "green" technology, a hotel and conference center, a "trailhead building" that would sell snacks and drinks in the summer, and parking for 750 cars.