The U.S. Environmental Protection Agency said it would reconsider certain aspects of the boiler and commercial/industrial solid waste incinerator (CISWI) rules it issued Feb. 23.

EPA said that while it has taken final action on the rules and believes they final rules reflect reasonable approaches consistent with the requirements of the Clean Air act, some issues raise “difficult technical issues that we believe may benefit from additional public involvement.”

EPA listed several issues it considers ripe for reconsideration:

• Revisions to the proposed subcategories in the major source boilers rule.
• Establishment of a fuel specification in the major source boilers rule through which gas-fired boilers that use a fuel other than natural gas may be  considered Gas 1 units.
• Establishing work practice standards for limited use major source boilers.
• Establishment of standards for biomass and oil-fired area source boilers based on generally available control technology.
• Revision of the proposed subcategory for energy recovery units for CISWI units.
• Establishment of limitations on fuel switching provisions for CISWI units.
• Revision to the proposed definition of CISWI to exclude cyclonic burn barrels.
• Providing an affirmative defense for malfunction events for major and area source boilers and for CISWI units. • Revisions to the proposed monitoring requirements for carbon monoxide for major source boilers and for CISWI units.
• Revisions to the proposed dioxin emission limit and testing requirement for major source boilers.
• Establishing a full-load stack test requirement for carbon monoxide coupled with continuous oxygen monitoring for major source boilers and CISWI units.
• Establishing a definition of “homogenous waste” in the CISWI rule.
• Setting PM standards under generally available control technology for oil-fired area source boilers.
• Certain findings regarding the applicability of Title V permitting requirements for area source boilers.

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