Appendix I - ambient air quality (May 1976-January 1977) -- Appendix II - source identification (July-August 1976) -- Appendix III - source/receptor relationships -- Summary report In response to a request by the EPA Division of Stationary Source Enforcement, the NEIC undertook an investigation of the particulate emissions from the USSC-Geneva WOrks at Orem, Utah, and the impact of these emissions on the ambient air quality of the Wasatch Front Intrastate AQCR. One portion of the NEIC program was oriented to documenting peak 24-hour particulate concentrations within the Utah Valley, Seven ambient air quality monitoring stations were installed in the near vicinity of the Geneva Works and total suspended particulates (TSP) and meteorological data were collected from May 25, 1976 to January 19, 1977. Data from these stations, as well as from seven permanent stations operated by the Utah State Health Department, were analyzed to characterize air quality conditions in the Utah Valley. Because of problems associated with design and calibration of Hi-vol samplers, data collected during the period May 25 to July 5, 1976 were evaluated only for general trends. Significant interference from a fugitive dust source also limited the validity of data from NEIC station 6 for a portion of the survey. Data were analyzed according to four time periods: Early Summer (May 25 to July 5), Late Summer (July 19 to 31), Fall (September 1 to November 5), and Winter (November 19, 1976 to January 19, 1977).