SMT X OPPOSITE DIRECTION TKOF CAUSE LTT GAR. EVASIVE ACTION TAKEN.

Narrative

INITIALLY I WAS TOLD TO HOLD SHORT OF TXWY FOR THE RWY (UNSPECIFIED). I HAD LANDED ON RWY 25 10 MINS PRIOR TO INCIDENT AND THE WIND WAS FROM 200 DEGS AT 8 KTS. TFC CALLED ON A 4 MI FINAL (RWY UNSPECIFIED). I THEN CONTACTED GOLDEN ROCK AND TOLD THEM I COULD TAKE AN IMMEDIATE TKOF (RWY UNSPECIFIED); BUT ASSUMING RWY 25. TFC WAS NOT IN SIGHT AND TWR CLRED ME FOR AN IMMEDIATE TKOF (RWY UNSPECIFIED). I TAXIED ONTO RWY 25 AND IMMEDIATELY ADDED TKOF PWR ONLY TO NOTICE AN LTT ON A SHORT FINAL FOR RWY 7. THE LTT WENT AROUND FOLLOWED BY UNNECESSARY XMISSIONS ON THE FREQ. I TOOK OFF FROM RWY 7 WITH NO FURTHER INCIDENT. THE RWY AT GOLDEN ROCK IS 8000 PLUS FT LONG WITH ONLY 1 TXWY AVAILABLE NEAR THE END OF RWY 7. THE SMT X NEEDS OVER 2000 FT FOR TKOF AND AN INTXN TKOF FOR RWY 7 IS IMPOSSIBLE FOR THIS ACFT BECAUSE OF 700 FT UPHILL OF RWY AVAILABLE. THIS PROB COULD HAVE EASILY BEEN AVOIDED IF ALL PARTIES INVOLVED; THE LTT; MYSELF; AND ESPECIALLY THE CTLR; SPECIFIED WHICH RWY WAS INTENDED AND IN THE CTLR'S CASE; ACTIVE. MY LESSON LEARNED IS NEVER TO ASSUME.