Here is the catalog record for the Contra Costa Times.
We only carry the last three months in the library. We have access to the CC Times in the California North, Newstand (ProQuest), but only the coverage begins on 3/26/10.
If you need to find an article before 3/26/10 you will have to go to the county library. Here is the county catalog record. It looks like Pleasant Hill library is the only branch with microfilm. Their coverage starts in 1952.