In determining the classification of producer milk pursuant to § 1012.44, the following rules shall apply:

(a) Each month, the market administrator shall correct for mathematical and other obvious errors, the reports submitted by each handler pursuant to § 1012.30 and compute the total pounds of skim milk and butterfat, respectively, in each class at each pool plant.

(b) If any of the water contained in the milk from which a product is made is removed before the product is utilized or disposed of by a handler, the pounds of skim milk used or disposed of in such product shall be considered to be a quantity equivalent to the nonfat milk solids contained in such product plus all the water originally associated with such solids.

(c) The classification of producer milk for which a cooperative association is the handler pursuant to § 1012.9(b) or (c) shall be determined separately from the operations of any pool plant operated by such cooperative association.

(d) Skim milk and butterfat contained in receipts of bulk concentrated fluid milk and nonfluid milk products that are reconstituted for fluid use shall be assigned to Class I use, up to the reconstituted portion of labeled reconstituted fluid milk products, on a pro rata basis (except for any Class I use of specific concentrated receipts that is established by the handler) prior to any assignments under § 1012.44. Any remaining skim milk and butterfat in concentrated receipts shall be assigned to uses under § 1012.44 on a pro rata basis, unless a specific use of such receipts is established by the handler.