15A NCAC 02D .2604      NUMBER OF TEST POINTS

(a)  Method 1 of Appendix A to 40 CFR Part 60 shall be used to select a suitable site and the appropriate number of test points for the following situations:

(1)           particulate testing;

(2)           volatile organic compounds testing;

(3)           velocity and volume flow rate measurements;

(4)           testing for acid mist or other pollutants occurring in liquid droplet form;

(5)           sampling for which velocity and volume flow rate measurements are necessary for computing final test results; or

(6)           isokinetic sampling.

(b)  Method 1 of Appendix A to 40 CFR Part 60 shall be used as written with the following clarifications:

(1)           Testing installations with multiple ducts may be accomplished by testing the discharge stacks to which the ducts exhaust. If the multiple ducts are individually tested, then Method 1 shall be applied to each duct individually.

(2)           If test ports in a duct are less than two diameters downstream or less than one-half diameter upstream from any disturbance, such as a fan, elbow, change in diameter, or other physical feature disturbing the gas flow, the acceptability of the test location shall be determined by the Director before the test and after a review of technical and economic factors.

History Note:        Authority G.S. 143-215.3(a)(1); 143-215.65; 143-215.66; 143-215.107(a)(5);

Eff. June 1, 2008;

Readopted Eff. November 1, 2019.