[en] This appendix is divided into four sections: 8.1, Purpose and Scope; 8.2, Technical Approach and Methodology; 8.3, Overview of Assessments; and 8.4, Resource Assessment. The assessment of air quality impacts in the DEIS was intended as a worst case analysis. This resulted in the DEIS evaluation that there would be some violations of ambient air quality standards (AAQS). These projected violations were raised as a major concern by commenters on the DEIS. The DOE will comply with all AAQS in the construction and operations of the SSC. Therefore, the final EIS analysis has been revised to include more efficient mitigation measures to bring the emissions from the SSC within standards. This Appendix also identifies additional mitigation measures (to further reduce emissions) that are available to the DOE if required. These measures can be considered as necessary after the selection of the SSC site, when more detailed analyses are performed for the Supplement to the EIS and permitting coordination with the State begins. Additional changes in the final EIS resulted from comments received on the DEIS and further refinements in analyses. 27 refs., 59 tabs