NEED JOB LISTING FOR FEDERAL EMPLOYEE WHO NEEDS TO KNOW WHAT OTHER JOB
OPENINGS THERE ARE FOR TRUCK DRIVERS IN THE SAN DIEGO COUNTY AREA. HE
IS A POSTAL SERVICE EMPLOYEE AND DRIVES A SEMI-TRUCK. NEED COMPARABLE
JOBS WITHIN THE FEDERAL GOVERNMENT PAYING NO LESS THAN $50,000 A YEAR.

I wish I had a job that paid $50,000!  Although in the San Diego area
that probably isn't all that much :-(

Have you checked the various federal job listing sites listed below? 
I didn't see any in the pay range you were looking for today, but that
doesn't mean there won't be some tomorrow.  USA Jobs had 7 openings in
the San Diego area (or thereabouts) but none paid more than $44,900.

FedWorld < http://www.fedworld.gov/jobs/jobsearch.html >
USA Jobs < http://www.usajobs.opm.gov/ >
Federal Jobs Digest < http://www.jobsfed.com/ >
Federal Jobs Central < http://www.fedjobs.com/ >

And here is a link to employment pages of various federal agencies and
departments: < http://safetynet.doleta.gov/agenlist.htm >

Good luck!