~~Announced United:States Nuclear Tests— By Date. Date (GCT) Location . Operation Aqueduct-- Continued | Whiteface 12/20/89 NTS Shaft Weapons Related Less than 20 kt Metropolis 03/10/90 NTS Shaft Weapons Related 20 to 150 kt Builion 06/13/90 NTS Shaft WeaponsRelated 20 to 150 kt Austin 06/21/90 NTS Shaft WeaponsRelated Less than 20 kt Minera! Quarry DoD Event 07/25/90 NTS Tunnel WeaponsEffects Less than 20 kt Sundown 09/20/90 NTS Shaft WeaponsRelated Less than 20 kt Ledoux 09/27/90 NTS Shaft WeaponsEffects Less than 20 kt “s Qperation Sculpin LE RU aes Tenabo 10/12/90 NTS Shaft WeaponsRelated 20 to 150 kt Houston 11/14/90 NTS Shaft Joint US-UK 20 to 150 kt Coso 03/08/91 NTS Shaft WeaponsRelated Less than 20 kt Bexar 04/04/91 NTS Shaft WeaponsRelated 20 to 150 kt Montello 04/16/91 NTS Shaft WeaponsRelated 20 to 150 kt Floydada 08/15/91 NTS Shaft WeaponsRelated Less than 20 kt Hoya Treaty verification event 09/14/91 NTS Shaft WeaponsRelated 20 to 150 kt Distant Zenith 09/19/91 NTS Tunnel WeaponsEffects Less than 20 kt Operation Julin: : | . Ba Lubbock 10/18/91 NTS Shaft Weapons Related 20 to 150 kt Bristol 11/26/91 NTS Shaft Joint US-UK Less than 20 kt Junction Treaty verification event 03/26/92 NTS Shaft Weapons Related 20 to 150 kt -54-