NMAC AND LESS THAN STANDARD SEPARATION BETWEEN AIR TANKER AND SMA IN TRAFFIC PATTERN AT PIH. OPERATIONAL ERROR.

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WE HAD NEAR MISS WITH SMA Y; ON ILS FOR RWY 21; AFTER BEING CLRED FOR TKOF RWY 3. SMA Y; LNDG; DID NOT RPT TO TWR UNTIL 1 MI OUT (AFTER OCCURRENCE). OCCURRENCE HAPPENED APPROX 100' AGL AFTER TKOF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR SAID HE WAS HOPING SOMEONE WOULD CALL SO THAT HE COULD GIVE MORE DETAIL AND HAVE INCIDENT INVESTIGATED. I EXPLAINED THAT ASRS WAS NOT AN INVESTIGATIVE PROGRAM. HE HAS DISCUSSED INCIDENT WITH PIH TWR BUT THINKS THEY WOULD LIKE TO FORGET IT AND NOT PURSUE ANY FORMAL REVIEW. WHEN RPTR LIFTED OFF RWY 3 HE STARTED VERY SHALLOW RIGHT TURN AT ABOUT 50' AGL. AT 100' AGL THE SMA PASSED OPP DIRECTION ABOUT 100' OFF LEFT WING AT SAME ALT. HEARD LATER THAT SMA ONLY HAD 1 RADIO AND WAS NOT ON TWR FREQ DURING ILS RWY 21 APCH UNTIL AFTER ACFT HAD PASSED ABOUT 1 MI FROM RWY. BEFORE ACFT X TOOK OFF THEY WERE ADVISED BY TWR THAT TFC WAS HOLDING AT LOM AT AN ALT WHICH WAS WELL ABOVE PLANNED VFR ALT OF DEPARTING X SO WOULD BE NO FACTOR. APPARENTLY THE SMA Y HAD BEEN CLRED FOR ILS APCH BY ZLC; BUT PIH TWR HAD NOT BEEN INFORMED OR HAD FORGOTTEN THAT ACFT Y WAS ON APCH. SURFACE WINDS WERE FROM THE N SO RPTR THINKS ACFT Y SHOULD HAVE BEEN MAKING VOR RWY 3 APCH TO CONFORM TO FLOW OF TFC. FLT VIS WAS ABOUT 4 MI IN SMOKE AND HAZE. RPTR ACFT WAS TANKER ENRTE TO FIRE SCENE AND WAS MODERATELY HVY.