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74. AMENDMENTS TO RULE MARICOPA COUNTY AIR POLLUTION CONTROL REGULATIONS RULE 358 (POLYSTYRENE FOAM OPERATIONS) Pursuant to A.R.S. §49-479(b), set a public hearing for July 25, 2012 to solicit comments and consider the adoption of proposed amendments to Maricopa County Air Pollution Control Regulations, Rule 358 (Polystyrene Foam Operations). Upon Board approval, this item will become effective 07/25/2012. Maricopa County Air Quality Department is proposing a limited revision to Rule 358 (Polystyrene Foam Operations) to address requirements of performance test frequency. Rule 358 currently requires expandable polystyrene foam operations to test their Emissions Control Systems (ECS) once a year. At the time of adoption of Rule 358 on April 20, 2005, the department and the Environmental Protection Agency (EPA) believed annual performance testing was necessary because the expandable polystyrene (EPS) industry did not have a Control Techniques Guideline, standard AP-42 emissions factors, or a track-record of comparable performance test results. Since the adoption of Rule 358, there is sufficient compliance and performance test history to demonstrate the necessity of conducting a performance test only once every five years. (C-85-12-024-7-00)