(a) Appeal from resident grader's grading or decision in an official plant. Any interested party who is not satisfied with the determination of the class, quality, quantity, or condition of product which was graded by a grader in an official plant and has not left such plant, and the operator of any official plant who is not satisfied with a decision made by a grader or any other matter relating to grading in such plant, may request an appeal grading or review of the decision by filing such request with the grader's immediate supervisor.

(b) All other appeal requests. Any interested party who is not satisfied with the determination of the class, quality, quantity, or condition of product which has left the official plant where it was graded, or which was graded other than in an official plant, may request an appeal grading by filing such request with the regional director in the area where the product is located or with the Chief of the Grading Branch.