A B757-200 SCHEDULED POTABLE WATER SYS CHLORINATION WAS NOT ACCOMPLISHED DUE TO JOB CARD DEFICIENCY AND LEAD TECHNICIAN INCOMPETENCE.

Narrative

THE WAY THE JOB CARDS SIGN OFF FOR THIS TASK ON ETOPS TYPE ACFT FOR MY CARRIER; WAS BLENDED IN WITH A TASK ATOP OF IT ON THE SIGNOFF SHEET. I PLACED OFF; ALL THE TASK TO BE PERFORMED; A WATER CHLORINATION TASK WAS NOT ASSIGNED DUE TO THE MISPLACED WAY IT WAS ON THE SIGNOFF SHEET. I OVERLOOKED THIS TASK AT APPROX XA30 WHILE PREPARING TO MOVE THIS ACFT. IT WAS BROUGHT TO MY ATTN: TASK WAS NOT ASSIGNED. I TOOK THE SHEET; SIGNED IT. TOLD THE MECH NOT TO WORRY 'I'LL TAKE CARE OF IT' AND GUESS THEY WILL DRINK BOTTLE WATER (I WILL DEFER IT LATER). AS I FINISHED THIS I WAS TOLD THAT A COMPANY WE PROVIDE OVERNIGHT MAINT NEEDED THEIR PLANE NOW FOR AN XC10 DEP. SINCE I WAS THE ONLY TAXI PERSON FOR TYPE ACFT; I TOOK THE PLANE TO THE NEEDED GATE AND ARRIVED BACK AT MY HANGAR AT XD00. HAVE NOW FORGOTTEN TO DEFER THE WATER CHLORINATION; AND STILL WITH ANOTHER ACFT THAT I HAD TO GET OUT. WHILE I WAS AWAY; AN UPGRADE LEAD PLACED MY WORK PACK IN THE COMPLETE CHK. A SUPVR QUESTIONED ME ON THE WATER; AND I TOLD HIM IT WAS NOT DONE AND I'M GOING TO GET A DEFER ON IT. HE WANTED IT DONE. TRIED TO GET MEN TO DO TASK; SINCE IT WAS END OF TOUR. NO TAKERS. WENT AND DEFERRED TASK. CONTRIBUTING FACTOR: GETTING TOO INVOLVED IN TOO MANY TASKS.