[en] This report contains environmental monitoring data collected at the Feed Materials Production Center during 1979. These data show that the discharges of radioactive contaminants from FMPC operations were only a small fraction of the Department of Energy guide levels published in DOE Manual Chapter 0524. The resulting offsite radiation exposures would, therefore, be a small fraction of the standards for uncontrolled areas. Concentrations of environmentally important nonradioactive contaminants in water and air are also reported. Results show that FMPC operations did not cause State standards for these contaminants to be exceeded