Subpart R protects the public and the environment from the hazards of radioactive materials found in phosphogypsum.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
Some Guidance on Applying for Approval for Other Uses of Phosphogypsum (PDF)(5 pp, 55 K)
This document provides "some guidance" in recognition that we will continue to add more guidance in response to your questions about how to apply for approval of other uses for phosphogypsum.
Workbook: Applying to EPA for Approval of Other Uses of Phosphogypsum: Preparing and Submitting a Complete Petition Under 40 CFR 61.206 (PDF)(34 pp, 1 MB)
The purpose of this document is to provide information on how to prepare a complete petition to the U.S. EPA for the distribution and use of phosphogypsum for "other purposes" that is consistent with the requirements of our regulations for radon emissions from phosphogypsum stacks.
Potential Uses of Phosphogypsum and Associated Risks: Background Information Document (PDF)(124 pp, 5 MB,
This background information document provides information relative to the management, disposal and potential uses of phosphogypsum.
Background Information Document: ADDENDUM - Risk Assessment for Research and Development Uses of Phosphogypsum (PDF)(20 pp, 999 K,
This risk assessment of phosphogypsum used in laboratory research and development (R&D) activities has been prepared to support the Administrator's decision to conduct a partial reconsideration rulemaking of the NESHAP for phosphogypsum (40 CFR Part 61, Subpart R).
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 (PDF)(17 pp, 135 K,
This document describes the methods that must be used for certifying phosphogypsum for entry into commerce under Sections 61.204 or 61.206, as required by Section 61.207 of 40 CFR part 61, subpart R–National Emission Standards for Radon Emissions From Phosphogypsum Stacks.
Comments and Response to Comments, NESHAPs: National Emission Standards for Radon Emissions from Phosphogypsum Stacks (PDF)(26 pp, 1 MB,
A total of 107 general and specific comments were received by the docket following EPA's notice of proposed rulemaking on May 8, 1996.