PRESORTED STANDARD 
POSTAGE & FEES PAID 
EPA 
PERMIT NO. G-35 
United States 
Environmental Protection 
Agency 
Office of Research and Development (81 OR) 
Washington, DC 20460 
Official Business 
Penalty for Private Use 
$300 
Recycled/Recyclable Printed on paper that contains a minimum of 
50% postconsumer fiber content processed chlorine free 
