In order to determine the content of wastewater discharged from a user into the wastewater facilities of the city for the purpose of determining the waste strength multiplier, representative samples shall be secured by the city. REPRESENTATIVE SAMPLES shall be defined as those taken on a 24-hour composite basis or those taken as a composite of 3 grab samples taken at intervals of not less than 2 hours between samples. Representative samples shall be taken by or under the supervision of the city. The user shall be required to provide adequate sampling manholes and/or other required facilities for collecting composite samples or grab samples and shall be responsible for all costs related to providing those facilities.