1988 effluent monitor placement at Walnut Creek and Indiana Street, Arvada, Colorado at Rocky Flats perimeter. In preparation for the June 6, 1989 federal search warrant at Rocky Flats. by rockyfla1. Posted on December 18, 2019 1988 Effluent monitor placement at Walnut Creek and Indiana Street, Arvada, ColoradoEco Ed, Inc., photo July 8, 1987 Federal Bureau of Investigation Letterhead Memo (LHM) Rocky Flats Draft Search Warrant, Rocky Flats Nuclear Weapons Facility USDOJ debriefing memo January 10, 1989.