(a) Each company shall compute and record both daily and monthly the average heating value of the distributed gas tested at each of its testing stations as required by subdivisions (a) through (d) of section 229.50 of this Part and as determined by the tests required by section 229.4 of this Part. For every testing station where a recording calorimeter is maintained and operated, a continuous record of the heating value of the distributed gas, as determined by the recording calorimeter, shall be maintained and the corrected averaged heating value of the distributed gas shall be computed and recorded both daily and monthly from the continuous record, except that for each day that the corrected maximum heating value exceeds the corrected minimum heating value by two or more percent of the latter, the corrected average, minimum and maximum heating value of the distributed gas shall be computed and recorded from the continuous record. A copy of each heating value record shall be maintained at its originating testing stations.
(b) Where therm billing is employed, all records of calibration and tests made to determine the accuracy of the therm billing factor shall be maintained by the company.