The purpose of this rule development is to revise Rules 62-296.402, .404, .405, .408, .410, .570, and .702, F.A.C., to address the need for alternative air emissions limitations during transient operating conditions at regulated facilities, including during periods of startup and shutdown. This rule development will also revise and clarify provisions in Rules 62-296.401, .412, and .512, F.A.C., which are outdated or superseded by federal standards, and add alternative control requirements to Rule 62-296.415, F.A.C., to address operations at soil thermal treatment facilities.