State of Texas; Approval of State Implementation Plan (SIP) Addressing the Sulfur Dioxide Emission Limit; Site-Specific Revision to the SIP for the Aluminum Company of America (ALCOA) Facility in Rockdale, TX

This document announces the EPA's decision to approve a September 20, 1995, request from the State of Texas for a site-specific revision to the Texas sulfur dioxide (SO<INF>2) SIP. The revision amends the SO<INF>2 emission limitations applicable to the ALCOA facility in Milam County, Texas. In this action, the EPA is approving Texas' SIP revision allowing an increase in lignite fuel emissions of SO<INF>2 from 3.0 pounds per million British thermal units (lb/MMBtu) to 4.0 lb/MMBtu. The SIP revision also includes new requirements for limits on the sulfur content of the petroleum coke used at the ALCOA facility and an increased stack height to ``Good Engineering Practices'' (GEP) as defined in 40 CFR 51.100 (ii). Texas has modeled these changes demonstrating that with the revisions the National Ambient Air Quality Standards (NAAQS) for SO<INF>2 will remain protected.