Promulgation of Air Quality Implementation Plans; Arizona; Regional Haze Federal Implementation Plan; Reconsideration

Résumé

The Environmental Protection Agency (EPA) is revising portions of the Arizona Regional Haze Federal Implementation Plan (2014 FIP) applicable to the Phoenix Cement Company (PCC) Clarkdale Plant and the CalPortland Cement (CPC) Rillito Plant. This 2014 FIP was adopted earlier under the provisions of the Clean Air Act (CAA). We are finalizing without change our proposal to replace the control technology demonstration requirements for nitrogen oxides (NO X ) applicable to Kiln 4 at the Clarkdale Plant and Kiln 4 at the Rillito Plant with a series of revised recordkeeping and reporting requirements. When EPA finalized the 2014 FIP, we had limited operating data for the use of Selective Non-Catalytic Reduction (SNCR) on cement plants. Therefore, we required that PCC and CPC perform control technology demonstration projects to support the control efficiencies for SNCR in the 2014 FIP, as well as to determine if more stringent control efficiencies were achievable. In early 2015, a control technology demonstration project was performed on the SNCR installed at another CalPortland Cement facility, the Mojave Plant. Our analysis of the SNCR control efficiency data from that project indicated