Requirements for quality assurance are as follows:

(1)           A written quality assurance (QA) plan shall be available for review.

(2)           Records on analytical quality control tests on media and equipment shall be prepared and retained for five years.

(3)           A performance level of 75 percent shall be maintained for each method for which a laboratory is, or wishes to be certified. This 75 percent average shall be calculated from the 10 most recent performance sample data points from water performance studies, double blind, blind and on-site samples.

(4)           The laboratory shall comply with all quality control requirements in Rules .0247 and .0248 of this Section.


History Note:        Authority G.S. 130A‑315;

Eff. December 1, 1991;

Amended Eff. January 1, 1996;

Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. December 23, 2017.