Pressure Measurements. Each utility shall make a sufficient number of pressure measurements using recording pressure gauges so that it will have a substantially accurate knowledge of the pressures provided to its customers. Pressure Records. Pressure records obtained in complying with this regulation shall be retained by the utility for at least 2 years and shall be available for inspection by the Commission's representatives. Notations on each record shall indicate the following: The location where the pressure check was made; and The time and date of the check.