California Code of Regulations › Title 3 - Food and Agriculture › Division 2 - Animal Industry › Chapter 1 - Dairies › Article 14 - Official and Approved Testing Methods and Protocols › Section 512.2 - Character of Work and Tolerances

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
				  "Accuracy" means the degree of agreement of individual measurements with an
				  accepted reference value. The accepted reference value shall be the analytical
				  result made by the Department. "Precision" means the degree of mutual agreement
				  among individual measurements made under prescribed-like conditions.
(b) After notifying the management of any
				  milk distributor, milk processor, dairy association, or commercial testing
				  laboratory, the Department may obtain samples of any milk or cream previously
				  tested by a licensed tester for the payment of any milk or cream or component
				  of milk or cream. These samples may be tested in the Department's dairy
				  chemistry laboratory to determine the accuracy of the licensed tester's work.
				  The Department may request that the licensed tester retest the sample at the
				  original testing facility by the same method as the sample was originally run,
				  to determine the precision of the tester's work.
(c) Persons making milk component tests by
				  any approved or final action testing methods for payment purposes shall be able
				  to demonstrate a capability to reproduce their own original tests and be able
				  to produce work comparable to official final action tests from duplicate
				  samples tested by the Department's dairy chemistry laboratory within the limits
				  outlined in subsection (e) of this section.
(d) Where analysis of milk components for
				  payment purposes are made by infrared instrumentation, the Department will
				  provide calibration samples to laboratories at a frequency established by
				  mutual agreement but no less than that recommended in the instruction manual of
				  the manufacturer of the instrument. The laboratory must demonstrate that they
				  meet the required precision and accuracy as outlined in subsection (e) of this
				  section.
(e)
ACCURACY AND PRECISION OF MILK TESTS BETWEEN RETESTS
					 AND/OR OFFICIAL LABORATORY TESTS
Accuracy
Precision
Mean Difference
Standard Deviation of the Difference
							 (SDD)
Maximum Difference between
							 original test & retest
5-8
9-16
Component
Tests
Tests
±
±
% Milk Fat
0.04
0.03
0.05
0.06
% Total Solids
0.07
0.05
0.08
0.12
% Solids Not Fat
0.07
0.05
0.08
0.12
% Protein
0.05
0.04
0.06
0.05
% Lactose
0.05
0.04
0.06
0.07
(f)
				  When a retest on individual sample of milk exceeds the maximum difference in
				  subsection (e) of this section, the retest shall be used, unless the sample is
				  deemed to be unsuitable for testing due to oiling off, churning, water in the
				  sample, or other sample anomaly, in which case the application of the averaging
				  procedures in section
				  525(e) of this
				  article, shall be used. A test on an individual sample of milk that exceeds the
				  previous test average (minimum of 4 samples to arrive at previous test average)
				  by more than 0.2 % for any component will automatically trigger a
				  retest.
(g) When a retest on an
				  individual sample of milk does not exceed the maximum difference allowed in
				  subsection (e) of this section the original test must be used as the basis for
				  payment, and the original test will be reported on the original test sheet,
				  with an explanation of the retest.
(h) When a retest on a sample of cream
				  amounts to seventy-five hundredths of one percent (0.75%) or greater, the
				  retest shall be used, unless the sample is deemed to be unsuitable for testing
				  due to oiling off, churning, water in the sample, or other sample anomaly, in
				  which case the application of the averaging procedures in section
				  525(e) of this
				  article shall be used.
(i) The
				  Department may check the accuracy and precision of licensed testers' work by
				  unannounced inspections. The Department will review the work of licensed
				  testers whenever a complaint is made regarding the accuracy and precision of
				  their work.
1. New
					 section filed 10-19-79; designated effective 1-1-80 (Register 79, No.
					 42).
2. Editorial correction of Example 2 (Register 80, No.
					 6).
3. Amendment filed 2-15-2007; operative 3-17-2007 (Register
					 2007, No. 7).
Note: Authority cited: Section
						407,
						Food and Agricultural Code. Reference: Sections
						32921
						and
						34261.5,
						Food and Agricultural Code.