PARACHUTIST IS INFORMED AFTER JUMP IS CONCLUDED THAT THE PLT HAD NOT COMPLETED JUMP COORD WITH OLM TWR.

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I WAS INVOLVED IN JUMPING OP IN OLYMPIA; WA. WE HAD A NEW JUMP PLT THAT WKEND. HE HAD FLOWN 1 LOAD OF JUMPERS IN A C182 SUCCESSFULLY PRIOR TO THE ONE I WAS ON IN WHICH THE INCIDENT OCCURRED. ME AND A GROUP OF 5 OTHER JUMPERS WERE STANDING BY ON THE TARMAC OF THE PORT OF OLYMPIA WHILE THE NEW PLT PREFLTED. WE INFORMED THE PLT THAT THE JUMPS WOULD BE AT 4000 FT AND 12000 FT AGL. AFTER PREFLT; THE PLT ALLOWED US TO LOAD AND SEAT BELT IN. AFTER TKOF AND CLBING TO THE JUMP ALT OF 4000 FT; THE PLT FLEW OVER THE DROP ZONE. THE PLT THEN GAVE US PERMISSION TO OPEN THE WINDSCREEN AFTER HE REDUCED AIRSPD. WE VISUALLY CLRED THE AIRSPACE AND GAVE 2 HDG CORRECTIONS TO THE PLT TO GET US OVER THE DROP ZONE AT A GOOD EXIT POS. I THEN DOVE OUT OF THE PLANE OVER THE DROP ZONE. I OPENED AT 3000 FT AGL AND DSNDED SAFELY TO THE FIELD. AT NO TIME WAS THERE ANY OTHER AFT IN THE VICINITY. AFTER THE JUMP I LEARNED THAT THE PLT FAILED TO CONTACT ATC. I BELIEVED ALL COM HAD BEEN PERFORMED BECAUSE THE PLT TOLD US WE COULD OPEN THE WINDSCREEN AND REDUCE AIRSPD. IN THE FUTURE; BETTER COM BTWN PLT AND JUMPERS MUST BE PERFORMED TO PREVENT THIS TYPE OF SIT IN THE FUTURE.