(a) Allowable concentration. The gas distributed by each company shall contain not more than 30 grains of total sulfur per 100 cubic feet of gas volume measured at a temperature of 60 degrees Fahrenheit and an absolute pressure of 30 inches of mercury column.
(b) Equipment, testing procedure and required tests.
(1) In each instance of evidence of or doubt or difference of opinion regarding the presence of total sulfur in the distributed gas, or where directed by this commission, each company shall:
(i) provide its testing stations required by subdivisions (a) through (d) of section 229.50 of this Part with equipment for the quantitative determination of the total sulfur content of gas fully complying and maintained in full compliance with any one of the foms* recommended therefor by NBS C 48, or with the provisions of the relevant effective code of the American Society for Testing and Materials, the presently effective code being entitled "Standard Method of Test for Total Sulfur in Fuel Gases (D 1072-56)", and including a calibrated integrating dry displacement meter whose index may be read to 0.001 cubic foot; * So in original. "foms" should be "forms"
(ii) make all of the quantitative determinations of the total sulfur content of the distributed gas that may be required by this commission likewise in full compliance with either code; and
(iii) quantitatively determine and record the total sulfur content of the distributed gas at its testing stations required by subdivisions (a) through (d) of section 229.50 of this Part as directed by this commission.
(2) Where said company is periodically supplied with reports regarding the total sulfur content of said gas, the information in said reports shall be filed with this commission at the time of the filing of the monthly reports required by section 229.61 of this Part. 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.