EPA is taking direct final action to promulgate amendments to a final rule that provided national emission standards for hazardous air pollutants for existing stationary spark ignition reciprocating internal combustion engines. The final rule was published on August 20, 2010. This direct final action amends certain regulatory text to clarify compliance requirements related to continuous parameter monitoring systems. EPA is also correcting minor typographical errors in the regulatory text to the August 20, 2010, action.