40 CFR Part 61
EPA 402-R-98-008
National Emission Standards
for Hazardous Pollutants
Background Information Document
Statistical Procedures for Certifying Phosphogypsum for Entry Into Commerce, As
Required by Section 61.207 of 40 CFR Part 61, Subpart R
November 1998
U.S. Environmental Protection Agency
Office of Radiation and Indoor Air
Washington, DC 20460