This regulation establishes a tolerance for residues of tribenuron methyl in or on canola, seed; cotton, gin byproducts; cotton, undelinted seed; and flax, seed. E.I. DuPont De Nemours and Company requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA). In addition, this regulatory action is part of the tolerance reassessment requirements of section 408(q) of the FFDCA 21 U.S.C. 346a(q), as amended by the FQPA of 1996. By law, EPA is required to reassess 100% of the tolerances in existence on August 2, 1996, by August 2006. This regulatory action will count for eight reassessments toward the August 2006 deadline.