What are the California Overtime Labor Laws for Temp Employees?

I currently work at the US Post Office in California as a 'Casual' it is temporary employment. I worked 10 straight days, over that span I worked 8,9,12,12,13,11,11,10, 8, and 8 hour days. On the 13 hour day I also did not receive a second lunch. Are there different laws for temporary employees? I read about 2 lunches if you work over 12 hours and also about overtime pay if you work more than 7 days straight. Thanks for clearing any questions.