Today's action amends the existing regulation regarding the land application, surface disposal, and incineration of sewage sludge. The amendments clarify existing regulatory requirements regarding operational standards for pathogen and vector attraction reduction and provide flexibility to the permitting authority and the regulated community in complying with the minimum frequency of monitoring requirements. The amendments also make the incineration subpart of the regulation totally self-implementing by providing information on air dispersion modelling, incinerator testing methods, and continuous emission monitors to the sewage sludge incinerator owner-operator. It also amends the existing General Pretreatment Regulation for Existing and New Sources of Pollution by adding a concentration for total chromium in land-applied sewage sludge to the list of pollutants that are eligible for a removal credit issued by a wastewater treatment works treating domestic sewage.