yeah... First off, your employer, if they employ more than x number of people, is required by Federal law to post the labor laws for both the Federal provisions and the state provisions in a commonly accessible area. They may have changed in small ways over time at local levels (mostly regarding minimum wage), but I believe Federal Labor Law regarding breaks and lunches is, and for the past decade has, been:
For 4 hours of continous employment, the employee can take a 10 minute paid break.*
For 5 continous hours, the employer is REQUIRED to offer a 30 minute unpaid rest period.... THE EMPLOYEE IS NOT REQUIRED TO TAKE IT!*
Those are the only two Washington State Labor requirements dealing with employee breaks and they are the same for the Federal Reg's. (I just ran to our lunch room where I hung the posters to verify this info... anyone can look it up at their local state.gov and get their local version...)
*Food service employees, however, don't have the luxury of just up and taking their break all in one lump sum: since the food service employee's work schedule is dependent upon the ebb and flow of their customers, they are felt to have the opportunity to take a bunch of mini breaks (ie: not taking the entire 10 minutes at once.)
The only other pertinent issues on the poster regard the basic 40 hour work week limit and how much the employee must be paid for anything over the basic 40...
Hope that helps...