(a) Samples must be taken by one of the following methods:

(1) Spot sampling under §§3175.113 through 3175.115;

(2) Flow-proportional composite sampling under §3175.116; or

(3) On-line gas chromatograph under §3175.117.

(b) At all times during the sampling process, the minimum temperature of all gas sampling components must be the lesser of:

(1) The flowing temperature of the gas measured at the time of sampling; or

(2) 30 °F above the calculated hydrocarbon dew point of the gas.