Document yM2wn5RX26OZ1eZmjn9Z0pQE

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460 MAV 2 6 1993 OFFICE DP PREVENTION, PESTICIDES AND TOXIC SUBSTANCES BY FAX (503) 528-7105; direct line (503) 528-7151 2 pages total To: Ms. Carol van Strum, Watershed Watch Alliance Dear Ms. van Strum: I apologize for my delay In responding to your request for information on dioxin and furan contamination of 2,4-D and other pesticides. You had asked for which pesticide active ingredients the EPA required dioxln/furan contamination data, and how to interpret the table Included in Dr. Funk's March 2,1993 memo on dioxins and furans in 2,4-D. I have enclosed a list of compounds for which the contamination data were required by two different Data Call-In (DCI) notices issued several days apart In 1987. Many of the pesticides covered by these DCIs are no longer registered; some were cancelled through Special Review and Reregistration action (but I do not think any were canceled as a direct result of dioxin/furan contamination). Dr. Funk has confirmed that the limit of quantitation (ioq) is not a limit of detection, but Is established by the EPA as a level of concern, based on acute or chronic toxicity tests in laboratory animals. The Ioq Is determined using "worst case" testing scenarios and assumptions. The concentrations of some dioxins and furans In 2,4-D are detectable but do not exceed the levels of concern, and are recorded in the memo as observed maximum concentrations with values less than the ioq. Dr. Funk has offered to speak with you If you desire more Information on this subject. He can be reached at (703) 305-5430. If l can be of further assistance, feel free to call me at (703) 308-8019. Sincerely, Enclosure cc: Stephen Funk JJill Bloom, Review Manager Special Review Branch Special Review and Reregistration Division (H7508W)