AFTER LNDG APA ON RWY 35L AND TAXIING AS INSTRUCTED; A PA31 PLT STOPS JUST PAST THE RWY 35R HOLD SHORT LINE.

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ON DEC/TUE/04 AT APPROX XY00Z; I LANDED AT APA ARPT. THEY WERE QUITE BUSY AS THEY SOMETIMES ARE. I WAS CLRED TO LAND RWY 35R. ON SHORT FINAL; (1 MI OR LESS) THAT CLRNC WAS CANCELED AND I WAS CLRED TO LAND RWY 35L. AFTER LNDG; I CLRED THE RWY AT INTXN B12 AND CALLED GND CTL AND WAS TOLD TO CONTINUE TO TAXI ON TXWY B. AT INTXN B8; I STOPPED TO ASK IF I SHOULD TAXI ON TXWY B8 TO THE RAMP. I RECEIVED NO RESPONSE. I REALIZED THAT INADVERTENTLY I WAS OFF FREQ. THE TIME PERIOD IN MY ESTIMATION WAS 30-45 SECONDS. THE CTLR WAS QUITE UPSET AND THEN CLRED ME TO TAXI TO THE END OF TXWY B; TURN R; AND HOLD SHORT OF RWY 35R. I FAILED TO READ BACK THE CLRNC WHICH I KNOW THAT I AM SUPPOSED TO. AT THAT POINT I RECEIVED WHAT I CONCEIVED AS A TONGUE LASHING FROM THE CTLR (MAYBE I DESERVED). UPON REACHING THE END OF TXWY B; I TURNED R AND RAN INTO THE HOLD SHORT LINE. THE HOLD SHORT LINE IS VERY CLOSE AND BY MAKING A FULL 90 DEG TURN YOU WILL PROBABLY BE ON THE HOLD SHORT LINE. THE CTLR ISSUED A STOP COMMAND. I SHOULD HAVE BEEN MORE ALERT AND OBSERVING. I WAS NOT EXPECTING THE HOLD SHORT LINE TO BE THAT CLOSE TO THE TURN AND THAT FAR FROM THE RWY. BOTTOM LINE: I DID BREECH THE HOLD SHORT LINE. I WAS GIVEN A PHONE NUMBER TO CALL WHEN I REACHED THE RAMP. THE PERSON THAT I TALKED TO WAS VERY COURTEOUS AND EXPLAINED HOW WE ALL ARE INTERESTED IN SAFETY. I WOULD SUGGEST THAT THE HOLD SHORT LINE AT THE N END OF TXWY B BE REASSESSED AS TO ITS LOCATION AND HOW WELL IT IS DEFINED.