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

The Environmental Protection Agency (EPA) is taking final action to revise certain provisions in the Arizona Regional Haze (RH) Federal Implementation Plan (FIP) that apply to the Nelson Lime Plant. In response to a request for reconsideration from the plant's owner, Lhoist North America of Arizona, Inc. (LNA), we are replacing the control technology demonstration requirements for emissions of nitrogen oxides (NOX) applicable to Kilns 1 and 2 at the Nelson Lime Plant with revised recordkeeping and reporting requirements. We are not revising any of the emission limits that apply to these units, including the existing NOX emission limits, which can be met with selective non-catalytic reduction (SNCR) control technology. We also are taking final action to correct a misprint of the regulatory requirements in a table in the Arizona RH FIP that identifies the emission limits for NOX and sulfur dioxide (SO2) at each kiln.