(a) Where a company is periodically supplied with reports regarding the chemical composition of the natural gas purchased from a transmission corporation, the information in said reports shall be filed with this commission at the time of the filing of the monthly reports required herein by section 229.61. Said reports shall also include suitable identifying data such as the source of each gas sample tested, the date that it was taken, the date, method and location of test, etc. and sufficient information to demonstrate that each sample is representative of the gas delivered to the company.
(b) In all other instances, each company shall make and record the results of determinations of the chemical composition of the distributed gas at each of its testing stations required herein by subdivisions (a) through (d) of section 229.50 at such intervals and using such methods as may be acceptable to or required by this commission.