2. Biodiesel History Evaluation of Biodiesel Use and Fuel Supplier NOV 2004 DEC 2004 APR 2005 MAR 2005 FEB 2005 JAN 2005 Revised Biodiesel specifications implemented Evaluation indicates animal fat contamination in biodiesel Biodiesel Use Suspended Clogged fuel filter issue develops Biodiesel Use Begins in >550 pieces of mobile equipment JUL 2004 Biodiesel Use Restarted

3. Biodiesel Blends Spring/Summer Blend 20% Biodiesel 80 % Diesel No. 2 Fall/Winter Blend 20% Biodiesel 60 % Diesel No. 2 20 % Diesel No. 1 (Kerosene)

4. Biodiesel Supply Diesel No. 2 B100 B20 North Plant South Plant Local Fuel Supplier B-20 Delivered to TN OPS

5. Biodiesel Equipment Crucible Haulers Fork Lifts Other Trucks Front End Loaders >550 Pieces of Mobile Equipment Using B-20

6. Biodiesel Benefits Local air pollution reductions Improved working environment for equipment operators/plant personnel Decreased dependency on foreign oil supply Community stewardship

7. Future Actions Higher bio-diesel blend levels Discontinue kerosene usage in winter Use of other alternative fuels Solar power Energy efficiency projects

8. Alcoa Bio-Diesel Contact: Chris Moore Environmental Engineer (865) 977-2403 chris.moore@alcoa.com