Rocky Mountain arsenal Five at arsenal exposed to gas by clogged drain. RKN Je 16, 1975 p,5 Post Je 16, 1975 p.4 Sen. Gary Hart, Democrat-Colorado, calls on Army to end all operations at Rocky Mountain Arsenal involving highly toxic materials. RMN Ag 17, 1975 p.1,66 Post Ag 16, 1975 p.1,3 Sen. Gary Hart's arsenal criticism inaccurate, Shell Chemical Co. says. Post Ag 18, 1975 p.1,4 Sen. Hart disputes government claims that his criticism of arsenal was unfounded. RMN Ag 19, 1975 p.8