(a) The management of each facility that tests milk or cream for basis for payment shall designate one licensed tester to be the responsible party (designee) for ensuring that the samples are received, stored, handled, prepared, tested, and recorded as outlined in sections 499, 509, 510, 511, 512, 512.1, 512.2, 513, 513.5, 515, 516, 517, and 525 of Title 3 of the California Code of Regulations, and ensure that all personnel who test samples for payment are licensed testers. The designee shall also be responsible for ensuring that the daily calibration checks are performed and recorded properly, and that the instrument is maintained according to the manufacturer's suggested guidelines. Management shall, within at least 24 hours, notify the Department by telephone or electronic mail when there is a personnel change with regard to the designee, and make certain that at all times there is a trained backup person available to take over the designee's role.

(b) Each person purchasing, receiving, or selling milk or cream on the basis of milk components shall provide a refrigerator maintained at a temperature between 0° and 4.4°C. in which licensed weighers, samplers and testers shall keep all samples taken or maintained during sampling and holding periods. All such samples shall be kept in a secure place in the refrigerator which shall be constructed and maintained in a manner acceptable to the Department. Written procedures shall be in place to ensure the security of the samples at all times. A copy of the written procedures shall be submitted to the Department at the time the laboratory requests approval for payment testing, whenever procedures or methods are changed, or when requested by the Department.

(c) Samples of all milk and cream tested at a payment laboratory shall be maintained for a period of at least 72 hours after testing. The laboratory designee shall be personally responsible for their safekeeping.