Question: The periodic monitoring requirements for Construction Permit limits sufficient to meet Sections 39.5(7)(b) and (d) of the Act are addressed by the operational and production requirements in Condition 4.1.2(i) and the work practice requirement in Condition 4.1.2(j) and the Other Requirements in Condition 4.1.4(a). C. D. Pursuant to 35 IAC 217.394(d), except for those years in which a performance test is conducted pursuant to 35 IAC 217.394(a) or (b), the Permittee of an turbine must monitor NOx concentrations annually, once between January 1 and May 1 or within the first 876 hours of operation per calendar year, whichever is later. If annual operation is less than 876 hours per calendar year, each turbine must be monitored at least once every five years. Monitoring must be performed as follows: I. II. A portable NOx monitor utilizing method ASTM D6522-00, as incorporated by reference in 35 IAC 217.104, or a method approved by the Agency must be used. If the engine or turbine combusts both liquid and gaseous fuels as primary or backup fuels, separate monitoring is required for each fuel. NOx and O2 concentrations measurements must be taken three times for a duration of at least 20 minutes. Monitoring must be done at highest achievable load. The concentrations from the three monitoring runs must be averaged to determine whether the unit is in compliance with the applicable emissions concentration or emissions averaging plan, as specified in 35 IAC. Need Assignment Help?