CPS LCL CTLR INCORRECTLY ASSUMES GA IS AT ANOTHER LOCATION FOR DEP WHEN CLRING HIM FOR TKOF ONLY TO RECOGNIZE A POTENTIAL CONFLICT WITH AN ARRIVING JET.

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IT WAS ON A QUIET SUNDAY MORNING THAT I CALLED CPS GND FROM THE NW RAMP; READY FOR TAXI WITH THE ATIS; VFR DEP TO THE SE...GND REPLIED; TAXI TO RWY 12R. IN ORDER TO GET TO RWY 12R; I HAD TO CROSS RWY 4/22 AND TURN R WITHIN 50 FT OF XING; AND THAT WOULD PUT ME AT THE HOLD SHORT LINE FOR RWY 12R. AS I TAXIED FROM THE NW RAMP; SUDDENLY THERE WERE 3 BIZ JETS IN A ROW; LINED UP FOR TKOF RWY 12R; WITH ANOTHER TWO ON THE N RAMP CALLING FOR CLRNCS. IT WAS OBVIOUS; THERE WAS NO ROOM FOR ME TO GET INTO LINE; SO GND CALLED AND SAID; 'XXXX HOLD AT RWY 4/22 AND I WILL GET THESE JETS OFF AS SOON AS POSSIBLE.' I REPLIED; 'ROGER; WILL HOLD SHORT OF RWY 4/22 AND DO MY RUN-UP HERE.' WITHIN 6-7 MINS; THE JETS WERE DEPARTED. I NOW REALIZE THAT 1 CTLR IS WORKING BOTH GND AND TWR FREQS; TALKING TO AT LEAST 4 OTHER AIRPLANES IN THE AIR AND 2 IN THE PATTERN; AND ANOTHER IFR HAWKER IS TAXIING FROM THE N RAMP HEADED FOR RWY 12R AS WELL. IT WAS AT THIS POINT THAT THE CTLR SAYS; 'XXXX TAXI INTO POS AND HOLD; RWY 12R.' I REPLIED; 'ROGER; TAXI INTO POS AND HOLD; RWY 12R; XXX.' I CROSSED RWY 4/22; CHANGED TO TWR FREQ; AND MADE MY R TURN AND PROCEEDED TO CROSS THE HOLD SHORT LINE; AND STOPPED ABRUPTLY AS I SAW A LEARJET ON FINAL. WITHIN 2-3 SECONDS THE CTLR YELLED; 'GAR.' THE LEARJET PLT SAID; 'IT'S OK; HE STOPPED; WE CAN MAKE THIS.' HE LANDED WITHOUT INCIDENT. THE CTLR THEN; WITH SOME STRAIN IN HIS VOICE SAID; 'I TOLD YOU TO HOLD SHORT OF RWY 12R.' I REALIZED AT THAT POINT THAT HE HAD MADE AN ERROR. I CHOSE TO REPLY; 'SORRY ABOUT THAT.' HE IMMEDIATELY CLRED ME FOR TKOF; WITHOUT FURTHER COMMENT. WHAT CONCERNED ME ABOUT THIS INCIDENT WAS THAT THE TAXI-RUN-UP-TKOF ROUTINE WAS QUITE UNORTHODOX. JUDGING FROM THE WORKLOAD ON THE CTLR; WORKING PLANES IN THE AIR; AND ON THE GND SIMULTANEOUSLY; INCLUDING IFR CLRNCS; CONTRIBUTED SIGNIFICANTLY TO THE INCIDENT. I DON'T KNOW THE FAA REGS THAT DETERMINE WHEN IT IS ACCEPTABLE TO HAVE 1 CTLR WORKING BOTH POS.