The district wants to build athletic fields atop the former dump that was more recently home to public housing, but a neighborhood group has filed a lawsuit against the district.
Small charter groups lack the buying power of large school districts.
Advocates of four-day school weeks say the schedule can save money and attract teachers. Critics worry about an extra day of childcare for working parents.
The order came down 15 minutes before graduation was set to begin, according to a civil rights attorney who represented six students.
CEO Michelle Blouin-Williams has been on paid leave since an investigation began April 1. She is also being investigated for allegedly falsifying public records.
More than half of schools with water filters have at least some that are not working. The district has known about low water pressure problems since September.
The main-round results were released Wednesday, parents must register with the school or enter the second round
