Nine of 10 Civil Service Commission workers will keep their same job and office even if Congress approves President Carter's plan to dissolve the merit-system agency and split its duties among two new federal establishments.

Once the CSC-splitting bill goes to Congress the Senate and House have 60 legislative (not calendar) days to disapprove it, or it becomes law automatically.

Approximately 256, of CSC's 7,100 full-time workers would be shifted over to the new Federal Merit Protection Board. Another 97 CSC people would be sent to work for the Equal Employment Opportunity Commission, according to shakeup plans of the moment.

The remaining CSC workers - with some exceptions - will go into the new Office of Personnel Management. OPM is expected to be housed in the present CSC headquarters building at 19th and E Streets NW.

For most CSC employes who wake up one morning and find themselves OPM workers, the surface changes will be limited to new stationery, some new office designations and a new seal and flag - every agency must have a flag - to replace the CSC banner which probably will be retired. The majority of the CSC-to-OPM aides probably will keep their same jobs and titles, remain in the same offices and have the same parking and car pool arrangements.

The one CSC worker who will notice the biggest change will be its top career man, executive director Raymond Jacobson. There is no place for an executive director in the new setup. Jacobson, a highly regardly bureaucrat, will have "retreat" rights to another federal job, but not necessarily at his current top level rank.

Reform Hearings: The House Post Office-Civil Service Committee will begin hearings March 14 on the president's proposals to reshuffle the government's personnel system. CSC Chairman Alan K. Campbell will be tthe leadoff witness. Individuals and organizations who want to testify (and there should be lots of them) should call 225-4054.

Cost of Living Raise: Postal workers will be getting an annual cost-of-living raise of at least $161 in May. The COL could go higher if the Consumer Price Index jumps over the next couple of months.

This cost of living raise has nothing to do with retired federal-military-postal workers who got a 2.4 per cent raise effective March 1. That will show up in April checks. Under their contract with the U.S. Postal Service, postal employes get regular cost-of-living raises in addition to fixed amount pay raises. That contract expires in July and this will be the last COL increase under it for postal employes.

Everything Is Satisfactory: The General Accounting Office says the government ought to drop its system of rating employe performance because everybody gets a "satisfactory" label. A recent GAO study showed that 99 of every 100 workers rated by their bosses were given the "satisfactory" stamp and the other one was rated "outstanding."

Almost nobody is ever rated "unsatisfactory," GAO said, because bosses have to go through so much red tape to make the unsatisfactory ratings stick that it is not worth the time or the hassle. GAO says the government does need a system - which employes and supervisors understand and consider fair - to rate workers for pay and retention reasons. But the present system, according to GAO, is pretty much a waste of time.