Calling these "voter mandated" is a serious stretch. It was the government agencies who put them on the ballots (as opposed to any voter initiative/petitioning), and it was those same government agencies who utterly lied about the fiscal effects in the ballot statements, as detailed in your own link. Quoting:

'The grand jury suggests voters may have been misled by official ballot pamphlet cost information on two of the three “significant” pension increases described in the report. A dozen retroactive retirement benefit increases between 1996 and 2008 are listed in a report appendix.

Voters were told that even with a retroactive pension increase for most employees (Proposition C in 2000) the city is not expected to make an annual payment to the retirement system “for at least the next 15 years.”

The eight-year period with no annual city payment to the retirement system, known as a “contribution holiday,” ended in 2004.

For a police and firefighter pension increase (Proposition H in 2002) voters were told that with a “large surplus” city contributions should not be needed for at least 10 years — but if needed, police and firefighters would pay “all or part” of the added cost.'