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PUE Program Standards Compendium Volume 3 Restricted Materials and Permitting Section J.3 Guidance for 1,3-D Enforcement Disclaimer This section is a summary of existing legal requirements for pesticide applications and provides guidance to CACs, their staff, and industry on requirements of the labeling of products which contain 1,3-D and the 1,3-D regulations adopted by DPR in 3 CCR sections 6448 through 6448.2, as well as examples of use scenarios. This guidance is not intended by DPR to be independently enforceable. Buffer zone and A "buffer zone"is an area that surrounds a pesticide application block in setback which certain activities are restricted for a specified period of time to protect terminology; human health and safety from existing or potential adverse effects associated usage with with a pesticide application. 1,3-D products A"setback"is a distance which separates sensitive sites from the application block. For 1,3-D, setbacks are used to increase the distance between non- occupational bystanders and applications. In certain situations, the labeling of products which contain 1,3-D prohibit use within 100 feet of an occupied structure, such as a school, hospital,business or residence, or require the structure to be vacant for the seven consecutive days following application. While the labels refer to this as a"buffer zone", in practice it is a"setback"as used above. 3 CCR section 6448(b)requires the application block be"setback"from strictures that will be, or may be,occupied at any time during the seven days following the application, unless the structure is vacated during the entire setback period. The setback distances range from 100 feet to 500 feet based on the application rate and acreage treated. 3 CCR section 6448(d)requires a 100-foot buffer zone around application blocks based on application method and crop to be grown following application. For those applications where buffer zones are required, the buffer zone expires 48 hours after the application is complete. Continued on next page J-7 Appendix J— 1,3-Dichloropropene(Field Soil Fumigation) Recommended Permit Conditions and Enforcement Guidance(10-07-2025)