This document summarizes the basic principles that underlie EPA's approach to pesticide cumulatve risk assessment and provides an explanation of the preliminary organophosphate risk assessment, released December 3, 2001.

• Status of Cumulative Risk Assessment for Organophosphate Pesticides (PDF)(98 pp, 522 K)
• Appendix I - Example Calculations (Food, Water; Aggregate and Cumulative) (PDF)(37 pp, 379 K)