25 C.F.R. § 227.19
(b) When oil is taken by authority of a division order, the lessee or his representatives shall be actually present when the oil is gaged and records are made of the temperature, gravity and impurities. The lessee will be held responsible for the correctness and the correct recording and reporting of all the foregoing measurements, which except lowest gage, shall be made at the time the oil is turned into the pipeline. Failure of the lessee to perform properly these duties will subject the division order to revocation.
Cross Reference: For oil and gas operating regulations of the Geological Survey, see 30 CFR part 221.