Quality control records pertaining, but not limited to the following areas, shall be retained by the laboratory for at least the 3 most recent years:

(a) Prepared solution standardizations;

(b) Recovery studies by known analyte additions;

(c) The purity checks of reagents and test materials;

(d) Apparatus and equipment calibrations;

(e) The quality examination and testing of materials;

(f) The mandatory participation in proficiency check sample testing or collaborative studies;

(g) Daily critical parameter checks of equipment, such as temperature readings;

(h) The equivalency tests of new procedures with standard methodologies.