I see from one of your other posts that you're restricted by sudo to a small set of commands, so you're unlikely to be able to run this directly, but...
durep is really nice for this sort of thing:
durep creates disk usage reports with bar graphs, allowing one to easily deduce
which directories are using the most space. Although durep can produce text
output similar to du, its real power lies in the ability to store reports in a
file, which can then be viewed as a web page with the supplied cgi script
Who knows, your boss may like this enough to possibly persuade your sysadmins to install it ;-)