Photo | Tagged Arvada, Colorado, Eco Ed image, effluent monitor, Indiana Street, Rocky Flats, USEPA, Walnut Creek 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