This guidance manual has been prepared to assist facilities in the chemical distribution facilitie comply with the reporting requirements of Section 313 of the Emergency Planning and Community Right-to-Know Act. Section 2 presents an overview of Section 313 reporting requirements. Section 3 provides a detailed discussion of making threshold determinations regarding the manufacture, processsing, and otherwise use of EPCRA Section 313 chemicals. Section 4 covers general concepts of EPCRA Section 313 release estimation and common reporting errors, and provides potential data sources for determining releases and amounts in waste at chemical distribution facilities. Section 5 presents a detailed discussion of EPCRA Section 313 release and other amounts managed in the chemical distribution industry. Finally, Appendix A provides an alphabetical listing of the Section 313 chemicals and chemical categories subject to EPCRA Section 313, and the de minimis concentrations for each Section 313 chemical. Appendix B provides a bibliography of relevant EPA documents used to help chemical distribution facilities in complying with EPCRA Section 313.