Fortunately, yesterday a bus driver gave me the actual scheduling documents used to assign shifts, called the "run cut," and the proposed documents that the city wants to use. I don't know why neither the city nor the union made these documents public before, but now people can look at the documents and form their own conclusions.
In the interest of getting as much information in the hands of readers as possible, yesterday I scanned in the dozens of pages and uploaded them to our website. But be forewarned: these are very large PDF files, and will take a while to download. I suggest opening them in another tab, and reading further as they download to your computer. (And please forgive the low quality of these scans-- it's the weekend and The Coast's tech people are out of the office; I'll try to improve them tomorrow.)
There are two documents. The first is a list of the existing bus driver shifts, as of November 2011, found here (PDF, 120 MB). The second is an example of the proposed "roster" of shifts the city is putting forward, as presented to drivers, and is here (PDF, 88 MB).