A B757 FLC FAILED TO CROSS VITEV INTXN AT ASSIGNED AIRSPD AS REQUIRED ON THE ARR TO CYVR.

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AS WE WERE APCHING VANCOUVER AND CLRED DIRECT TO THE BOOTH INTXN AND MAINTAIN 300 KTS. WE WERE THEN CLRED FOR THE STAVE 6 ARR; DSND AND MAINTAIN 10000 FT. I FELT UNCOMFORTABLE DSNDING ALL THE WAY DOWN TO 10000 FT. IMMEDIATELY EVEN THOUGH WE WERE VMC AND I HAD TURNED ON THE EGPWS. BECAUSE IT WAS THE FIRST TIME I HAD FLOWN THE STAVE 6 AND BECAUSE WE WERE OFF THE AIRWAY AND THE GRID MORAS WERE HIGH IN THAT AREA. SAFE ALTS INSIDE OF BOOTH ARE SHOWN ON THE ARR PAGE. WE LEVELED OFF AT 11000 FT AND I KEPT SCANNING THE RADIO ALTIMETER. AS WE WERE CLOSE TO THE BOOTH INTXN WE RECEIVED A TA FROM APCH CTL FOR VFR TFC COMING TOWARD US FROM THE OPPOSITE DIRECTION. IT TOOK A FEW MOMENTS TO FIND THE TFC. I THEN NOTICED THAT WE WERE ALREADY CLOSE TO VITEV AND STILL GOING 300 KTS. THE FO RETARDED THE THROTTLES TO IDLE AND DEPLOYED FULL SPD BRAKES. THE CTLR TOLD US TO REDUCE SPD AND WE WERE ABLE TO SLOW TO THE 230 KT RESTR A FEW MI INSIDE OF VITEV. WE THEN CONTINUED OUR DSCNT INTO CYVR. I DID NOT REALIZE HOW CLOSE BOOTH AND VITEV WERE UNTIL AFTER THE FACT.