II. Petitioners 
Petitioner Environmental Defense Fund, Inc., is a 
not-for-profit public-benefit membership corporation organized 
and existing under the laws of the State of New York. Its 
principal office and place of business is located at 162 Old 
Town Road, East Setauket, New York. It also maintains offices 
in Washington, D.C.; New York, New York; Denver, Colorado; 
and Berkeley, California. EDF has a nationwide membership of 
over 40,000 persons, composed of scientists, educators, lawyers, 
and other citizens dedicated to the protection of the environ- 
ment and the wise use of natural resources. Many of these 
persons and their children will be subjected to the increased 
risk of adverse health effects discussed in at pp. 9-12, infra , 
if the Secretary does not adopt effective regulations controlling 
the relevant procedures. By its activities, EDF seeks the 
preservation and restoration of environmental quality and the 
protection of the country's natural resources on behalf of 
the. general ’public. Its objectives include combining "the best 
scientific findings with the most appropriate social action 
discovered by the social sciences and legal theory in order 
that practical decisions shall be made which shall best promote 
a quality environment." (EDF By-laws, Art. 1:2 (d) ) . 
Petitioner Natural Resources Defense Council, Inc. , is a 
not-for-profit, tax-exempt corporation organized under the laws 
of the State of New York, with offices at 15 West 44th Street, 
New York, New York; 917 15th Street, N.W. , Washington, D.C.; 
and 2345 Yale Street, Palo Alto, California. NRDC is a national 
organization dedicated to environmental protection, including 
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