All records required by these regulations or necessary for the administration thereof shall be available for examination by the Commission or its authorized representatives. Unless otherwise specified by the Commission, all records required by these regulations shall be preserved for the period of time specified in the current edition of the National Association of Regulatory Utilities Commissioners' publication, “Regulations to Govern the Preservation of Records of Electric, Gas and Water Utilities”, to the extent that the provisions are applicable to sewage disposal utilities. Each utility shall file with the Commission a copy of its tariff which shall include: Rates. Each schedule of rates for service. Regulations. The utility's regulations, or terms and conditions, describing the utility's policies and practices in rendering service. Special Contracts. Each utility shall file with the Commission a copy of each contract for service not covered by the utility's filed tariff. Installation rules. Each utility shall file with the Commission a copy of the utility's rules, if any, designed by the utility for the use of engineers, architects, contractors, etc., covering service installations. Bill forms. Each utility shall file with the Commission a sample of each type of customer bill form, which shall include the information normally shown on a customer's bill for service. Map of System. Each utility shall file with the Commission a map showing the utility's operating area. This map shall be revised annually unless no revision is necessary, to reflect a material change in the items listed below. The maps on file should reflect the current status of the following items: Location of pumping stations, treatment plants, and disposal points; Mains by size; Location of manholes; Territorial boundary; and Names of all communities (post offices) served. Persons to Contact. Each utility shall file with the Commission the name, title, address, and telephone number of the person who should be contacted in connection with: General management duties; Customer relations (complaints); Engineering operations; and Emergencies during non-office hours. Fatal Accident Notice. In the event of a fatal accident, prompt notice shall be given to the Commission by telephone. Accident Notice. Each utility shall file with the Commission an “Accident Notice” report, on forms provided by the Commission, within 30 days after the end of any month during which an accident occurred. Construction Reports. Each utility shall file with the Commission a notification of all proposed important additions to plant, the construction of which was started by the utility during the preceding month. For the purpose of this regulation, an important addition to plant means a single project involving the expenditure of at least $50,000, or an amount equivalent to at least 10 percent of the total sewerage plant in service, whichever is less. The notification shall be submitted, in duplicate, on forms supplied by the Commission. One copy will be numbered for identification and returned to the utility to be completed and returned to the Commission when the construction of the project has been completed to the extent that the facility was placed in operation during the preceding month. Location of Records. Each utility shall notify the Commission of the location at which it keeps the various classes of records required by these regulations. Public Utilities Article, §§2-121, 5-101, 5-302, and 6-201—6-207, Annotated Code of Maryland Effective date: September 1, 1965 (Order No. 55971) Regulation .04D, F amended effective March 18, 2013 (40:5 Md. R. 412)