(a) For any of the months of January through March and July through December, any plant at which 25 percent or more of the combined receipts of skim milk and butterfat in milk from dairy farmers and units is classified as Class I-A in the marketing area or as Class I-A on the basis of a transfer to a pool plant on some basis other than the failure to account for such milk shall automatically be designated a pool plant for such month: provided, that at the option of the handler the plant shall not be a pool plant if less than 25 percent of such combined receipts of skim milk and butterfat in milk from other than pool units is classified in such Class I-A.

(b) For any of the months of April, May, or June, any plant at which during the preceding period of October, November, and December either (1) no milk was received from dairy farmers or units, or (2) 60 percent or more of the combined receipts of skim milk and butterfat in milk received from dairy farmers and units was classified in Class I-A in the marketing area or as Class I-A on the basis of a transfer to a pool plant, on some basis other than the failure to account for such milk, shall automatically be designated a pool plant for any of such months of April, May, or June in which 10 percent or more of the combined receipts of skim milk and butterfat in milk received from dairy farmers and units is classified in Class I-A in the marketing area or as Class I-A on the basis of a transfer to a pool plant, on some basis other than the failure to account for such milk: provided, that at the option of the handler the plant shall not be a pool plant if less than 10 percent of combined receipts of skim milk and butterfat in such milk from other than pool units is classified in such Class I-A.

(c) Any plant which is a pool plant in any of the months of April, May, or June on the basis of subdivision (b) of this section or on the basis of subdivision (d) of this section and in the latter case, the percentage of combined receipts of skim milk and butterfat in the milk from dairy farmers and units classified in Class I-A in the marketing area or as Class I-A on the basis of a transfer to a pool plant, is at least as great as the market percentage of pool milk in Classes I-A and I-B for the same month of the previous year, shall be a pool plant in any of the months of July through March following in which 60 percent or more of the combined receipts of skim milk and butterfat in milk received at the plant from dairy farmers and units is classified in Class I-A, Class I-B, or Classes I-A and I-B combined.

(d) Any plant which for any month is not a pool plant because of failure to meet the requirements of subdivision (a), (b), or (c) of this section shall be a pool plant in any month in which a daily average of at least 800 pounds of combined receipts of skim milk and butterfat in milk received from dairy farmers and units is classified as Class I-A in the marketing area or as Class I-A on the basis of a transfer to a pool plant on some basis other than failure to account for such milk and if the percentage of combined receipts of skim milk and butterfat in milk classified as Class I-A and Class I-B is at least as great as the market percentage of pool milk in Classes I-A and I-B for the same month in the preceding year: provided, that at the option of the handler, the plant shall not be a pool plant if none of the skim milk or butterfat in such milk from other than pool units is classified in such Class I-A: provided further, that such plant shall not be a pool plant on the basis of this subdivision if it is located in the 401 miles and over freight zone.

(e) A plant whose regular pool plant designation has been canceled at the request of the handler on the first of any of the months of August through November shall be a pool plant in any month through November 30 following such cancellation if the percentage of the combined receipts of skim milk and butterfat in milk received from dairy farmers and units classified in Class I-A, Class I-B or Classes I-A and I-B combined is at least as great as the market percentage of pool milk in Classes I-A and I-B for the same month in the preceding year unless such plant qualifies as a pool plant under an other order with a provision for marketwide equalization.

(f) A plant shall not be a pool plant on the basis of this section for the periods and under the conditions set forth in paragraphs (1) and (2) of this subdivision:

(g) At the time of announcing the uniform price for each month, the market administrator shall make public the location and name of the operator of any plant for which a report of receipts from dairy farmers was used in the computation of that uniform price.