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Chloropicrin and Chloropicrin in Combination with Other Products (Field Fumigant) Interim Recommended Permit Conditions, Continued Tree hole The maximum number of tree holes and acreage allowed to be treated for any limitations site (entire orchard) in a 24-hour period are: • 50 holes per acre in no more than 40 acres • 75 holes per acre in no more than 10 acres • 100 holes per acre in no more than 5 acres • 200 holes in no more than 1 acre If any site is fumigated more than once (e.g., sequential applications within a single orchard), at least 36 hours must elapse between fumigations. Elapsed time is measured from the time the earlier application is complete until. the staid of the later application. These limits assume that the tree holes are evenly distributed across the site, and may not provide adequate protection for tree holes that are unevenly distributed. To prevent bunching of tree holes, DPR recommends the following spacing between fumigated tree holes; • At least 30 feet for 50 holes per acre in no more than 40 acres • At least 25 feet for 75 holes per acre in no more than 10 acres • At least 20 feet for 100 holes per acre in no more than 5 acres • At least 15 feet for 200 holes in no more than 1 acre This recommended minimum spacing does not need to be achieved for each tree hole, but should be achieved for the majority of tree holes, particularly near the borders of an orchard. A separation of 51 feet between tree holes (i.e., minimum distance for no overlapping buffer zones) is likely insufficient separation between application blocks for this permit condition. The required buffer zone of 25 feet may not provide adequate protection if multiple application blocks within a single orchard (or adjacent orchards) are fumigated with less than 36 -hour separation. CAC staff should consult with DPR before allowing these types of fumigations. For products containing methyl bromide and chloropicrin, the application is limited .to 1 acre. Continued on next page 14 Appendix K-- Chloropicrin and Chloropicrin in Combination with Other Products (Field Fumigant) Interim Recommended Permit Conditions (Rev. 1- 17)