OPERROR NMAC WHEN ARR ACR DC10 WITHOUT LNDG CLRNC EXECUTES GAR RWY 12 AT THE SAME TIME AN ACR B737 IS DEPARTING RWY 19R. BOTH ACFT TOOK EVASIVE ACTION TO AVOID THE OTHER. RPTR STATED THE LCL CTLR WAS NOT AWARE OF THE DC10 WHICH CALLED 5 TIMES FOR LNDG CLRNC.

Narrative

ACFT #1 ON A MISSED APCH/GAR RWY 12. ACFT #2 DEPARTING RWY 19R. ACFT #1 DID NOT RECEIVE LNDG CLRNC AND EXECUTED GAR. ACFT #2 ROTATED AND SAW THE TFC ON AN INTERCEPT; BOTH ACFT DSNDED AND TURNED L TO AVOID EACH OTHER. THE LCL CTLR WAS COORDINATING A PREVIOUS GAR ON RWY 19R AND WAS DISTR BY FREQ CONGESTION AND TROUBLE COORDINATING ON LANDLINES. ACFT #2 SHOULD NOT HAVE BEEN RELEASED; LCL CTLR WAS NOT AWARE OF THE DC10 ON APCH TO RWY 12; WHICH CALLED 5 TIMES TO GET CLRNC TO LAND BUT TO NO AVAIL. LCL CTLR WAS WAY BEHIND THE PWR CURVE; AND APPARENTLY DID NOT REALIZE THE SIT WAS DEVELOPING. AN ASSISTANT LCL CTLR OR CAB COORDINATOR SHOULD HAVE BEEN ASSISTING THE LCL CTLR. SUPPLEMENTAL INFO FROM ACN 375178: APPEARED BOTH B737 AND DC10 TOOK EVASIVE ACTION AT DEP ENDS OF RWY 19R AND RWY 12. ACFT MISSED BY LESS THAN 1000 FT AFTER A CONSIDERABLE AMOUNT OF MANEUVERING. 2 TWR FREQS IN USE; LCL CTL E 128.42; LCL CTL W 120.1. OPERROR OCCURRED ON FREQ 120.1 (LCL CTL W). LCL CTL W WAS RESPONSIBLE FOR ACFT INVOLVED. I WAS WORKING LCL CTL E.