Section 2111 - Tests and Measurements of Gas(a) Gasoline content tests shall be made by or for the lessee at least once a month and at such other intervals as appear to be necessary in the opinion of the inspector.(b) An inspector shall be permitted to witness any tests for the gasoline content of casinghead gas.(c) All tests and measurements of gas shall be in accordance with the procedure expressed by the California Natural Gas Association in Bulletins T.S. 351, T.S. 353, T.S. 354, and any revisions thereof.Cal. Code Regs. Tit. 2, § 2111