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PUE Program Standards Compendium Volume 3 Restricted Materials and Permitting Guidance for 1,3-D Enforcement, Continued If setbacks or If the setbacks for two or more applications overlap,under 3 CCR section 1,3-D buffer 6448(c) the setback for both application blocks is based on the combined zones"overlap" acreage,the highest application rate, and the fumigation method with the largest setback. See example below on how to calculate the setback. DPR developed the 1,3-D buffer zones required under 3 CCR section 6448(d) to account for multiple applications. Thus, if the buffer zone for two or more applications overlap no additional mitigation is necessary at this time. Approved 3 CCR section 6448.1 requires DPR to maintain a"List of Approved Totally tarpaulins Impermeable Film(TIF)Tarpaulins"on its website. The List is available at <httt)s•//www cdpr ca gov/environmental-monitoring/air-monitoring/>. Click on,or scroll to,"1,3-Dichloropropene Field Fumigation Requirements"and click on the Approved Tarpaulin List. Soil moisture 3 CCR section 6448.2(b)specifies that an application block must have a soil requirements moisture of at least 50 percent of field capacity at a depth of three to nine inches below the surface when the fumigation occurs,except for drip applications. "1,3-Dichloropropene Field Fumigation Requirements,est. January 1,2026,"provides three options to check soil moisture requirements. Option 1 (Irrigation)is the easiest to implement but should only be used for very dry soils. Option 2 (Feel and Appearance)is most similar to the current label soil moisture method but has some subjectivity associated with determining soil moisture level based on an evaluation of soil texture. Option 3 (Soil Moisture Sensor)is more accurate than Option 1 and Option 2,but it is the most complex, expensive,and time consuming. The CAC has discretion to require the use of a specific soil moisture option based on local conditions. CACs can consult with their DPR Regional Office for soil moisture training information and availability of a soil moisture sensor specified by Option 3. The CAC should consider requiring recordkeeping for soil moisture as part of permit conditions until the U.S. Environmental Protection Agency finalizes the draft label changes for 1,3-D products that require fumigation management plans(FMPs), including recordkeeping for soil moisture. Continued on next page J-9 Appendix J—1,3-Dichloropropene(Field Soil Fumigation) Recommended Permit Conditions and Enforcement Guidance(10-07-2025)