The US DOL website has a feature that will help you determine whether you are exempt or not.
Start at:
http://www.dol.gov/elaws/esa/flsa/scope/menu.htm
Remember that the size of your employer and the number of employees may have a bearing on whether or not the employer even has to follow the law.
If not covered by federal law, check out CA requirements:
http://www.dir.ca.gov/dlse/faq_overtimeexemptions.htm
On that website scroll down to Order 14 and note that it doesn't differentiate between hourly and salary so I think you might be missing something there.

