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PtJE Program Standards Compendium Volume 3 Restricted Materials and Permitting Section JA Interim Recommended Permit Conditions for the Nontarpaulin Tree-hole Fumigation Method Background Under the authority in 3 CCR section 6448.3,effective on September 3, 2024, DPR granted interim approval of this fumigation method for three years. DPR must pursue rulemaking to include this new method in regulation prior to the expiration of the interim approval. These permit conditions expire on the effective date of the regulation amendment adopting this method or three years from the effective date above,whichever is earlier. Method This method applies to applications using a closed system application tube description followed by soil compaction to close the tube channel. Other individual tree- hole fumigations with 1,3-Dichloropropene(1,3-D)are prohibited. Conditions • The application rate must not exceed the maximum allowed by the product label or two pounds of 1,3-D active ingredient per hole, whichever is less. • The number of tree holes fumigated during a calendar year must not exceed 166 holes in any acre. • The distance or spacing between fumigated tree holes must be at least 15 feet. Exception: If two or more adjacent tree holes are to be fumigated as a group and the spacing is less than 15 feet, at least 24 hours must elapse from the end of the fumigation of one tree hole to the start of fumigation of the adjacent tree hole. • The tree-hole site must be prepared by backhoeing to break up restrictive soil layers that may retard fumigant movement. The backhoe site must be dug in the dimensions of at least 10 by 10 by 10 feet. The hole must then be backfilled. Soil moisture must meet the requirements specified in 3 CCR subsection 6448.2(b), after backfilling. • 1,3-D must be applied using a closed-system application tube(s). A "closed system application tube" incorporates 1,3-D into soil,but does not allow any 1,3-D contact with the air throughout the entire fumigation. Nitrogen must be used to purge the system before application tube is lifted out of the ground at any time. After the application tube(s) are removed, the soil must be rolled or compacted to close the channel(s) created by the application tube(s). Continued on next page J-13 Appendix J— 1,3-Dicbloropropene(Field Soil Fumigation) Recommended Pen-nit Conditions and Enforcement Guidance(10-07-2025)