"After a two-year-long process, the new Ballou High School will be completed in time for the spring 2015 academic term.   But construction is hardly over for the $142.5 million D.C. Public Schools project, according to Kenneth Diggs of the District Department of General Services.   Demolition of the old school building and construction of a new stadium and parking lot will begin as soon as the new building opens at 3401 4 ^th  Street SE. The stadium and parking lot will be completed by August 2015."