Annual compliance is based on the average of the annual stack tests on each municipal waste combustor (MWC) unit at the facility using the stack testing procedures contained in 40 CFR 60.58b(d)(2), incorporated by reference in 6 NYCRR Part 200 (see Table 1, section 200.9 of this Title). This average of all the facility's MWC units must be in compliance with the emission limit of 28 ug/dscm (corrected to seven percent oxygen) or 85 percent removal, whichever is less stringent. However, the average of annual stack tests on each MWC unit at the facility must be in compliance with the federal limit of 80 ug/dscm (corrected to seven percent oxygen) or 85 percent removal, whichever is less stringent. Four years after the effective date of this Subpart the averaging of the annual stack tests across all incinerators at the facility will end and each of the facility's incinerators must be in compliance with the emission limit of 28 ug/dscm (corrected to seven percent oxygen) or 85 percent removal, whichever is less stringent. Emission control devices must be kept in a satisfactory state of maintenance and repair in accordance with ordinary and necessary practices, standards and procedures, inclusive of manufacturer's specifications, required to operate such devices effectively. Compliance with this Subpart is required within one year of the effective date of this Subpart. Initial compliance testing must take place within 180 days of the compliance date of this Subpart.