| Contents Notes |
Introduction -- Process description -- Emission sources and related control equipment -- Emissions data -- A NEIC information request letter to Phelps Dodge -- B Phelps Dodge response to NEIC information request -- C SIP regulation applicable to Phelps Dodge -- D Calculations of gas flow rates, duct diameters, and isokinetic variations Phelps Dodge Corporation operates mines, concentrators, oxide ore leach operations a smelter in Morenci, Arizona. An inspection to acquire data with which to evaluate the design and operation of existting particulate matter air pollution control equipment at the smelter was conducted by EPA personnel on February 2, 1976. Substantial amounts of process, control equipment, and stack sampling information were requested of, and received from, Phelps Dodge. The following conclusions are based on the inspection and a review of the information obtained: 1. The Engineers Testing Laboratories (ETL), Phoenix, November 1975 source tests are not valid tests for the following reasons: (a) at least 24 sampling points on two diameters at the reverberatory furnace stack and at least 28 sampling points on two diameters at the converter stack are required rather than the points actually sampled and (b) isokinetic variations ranged from 71 to 82% for the reverberatory furnace stack runs and 51 to 61% for the converter stack runs; these variations are lower than the acceptable lower limit of 90%. Without valid test results and calculated allowable emission rates, no definitive conclusions can be made as to the status of compliance of this source. 2. No definitive conclusions as to the adequacy of existing control systems can be made from the design and operating data supplied by the Company |
