Approval and Promulgation of Implementation Plans; State of Washington; Regional Haze State Implementation Plan; Federal Implementation Plan for Best Available Retrofit Technology for Alcoa Intalco Operations and Tesoro Refining and Marketing

Riepilogo

EPA is proposing to partially approve and partially disapprove a Washington Regional Haze Implementation Plan (SIP) submitted by the State of Washington on December 22, 2010, that addresses regional haze for the first implementation period. This plan was submitted to meet the requirements of Clean Air Act (CAA) sections 169A and 169B that require states to prevent any future and remedy any existing man-made impairment of visibility in mandatory Class I areas. EPA is proposing to: (1) Approve portions of this SIP submittal as meeting most of the requirements of the regional haze program, (2) propose a limited approval and limited disapproval of the SO 2 Best Available Retrofit Technology (BART) determination for Intalco Aluminum Corp. (Intalco) potline operation and propose a federal "Better than BART" alternative, and (3) propose to disapprove the NOx BART determination for five BART emission units at the Tesoro Refining and Marketing refinery (Tesoro) and propose a federal Better than BART alternative. This combined rule package of proposed SIP approved elements and proposed federal elements will meet the requirements of CAA sections 169A and 169B. On August 20, 2012, EPA approved