Section 3175.111 - General sampling requirements(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.