Today the Environmental Protection Agency (EPA) is taking final action to determine that HCFC-22 and HCFC-142b are unacceptable for use in the foam sector under the Significant New Alternatives Policy (SNAP) program under section 612 of the Clean Air Act. The SNAP program reviews alternatives to Class I and Class II ozone depleting substances and approves use of alternatives which do not present a substantially greater risk to public health and the environment than the substance they replace or than other available substitutes. In prior rulemakings, the Agency listed HCFC-22 and HCFC-142b as unacceptable substitutes in several foam end uses; here, EPA is amending a determination for one category of end-uses and taking the following actions for remaining applications. First, EPA is finding HCFC-22 and HCFC-142b unacceptable as substitutes for HCFC-141b in commercial refrigeration, sandwich panels, and slabstock and "other" rigid polyurethane foams and removing narrowed use limits previously established in those applications. Second, EPA is finding HCFC-22 and HCFC-142b unacceptable as substitutes for CFCs in all foam end-uses. Third, the Agency is establishing a grandfathering period to allow existing users of HCFC-22 and HCFC-142b in pour foam applications, including commercial refrigeration, sandwich panels, and slabstock and "other" rigid polyurethane foams other than foam for marine applications, until March 1, 2008 to implement alternatives; existing users of HCFC-22 and HCFC-142b foam blowing agents in the manufacture of foam for marine applications (e.g., flotation foam) will be allowed to continue use of these blowing agents until September 1, 2009. Fourth, the Agency is grandfathering existing users of HCFC-22 and HCFC-142b in extruded polystyrene (XPS) foam and in all other foam end uses until January 1, 2010 in order to allow time for those users to complete their transition to alternatives.