A. A monthly sanitary sewer charge for flow is levied on each high strength user discharging directly to the POTW. This charge is at a rate as determined by the director and is based upon the measured volume of total wastewater discharged to the POTW or metered water consumption.

B. Rates for strength of nondomestic wastewater from high strength users are established as determined by the director for each pound of BOD and each pound of TSS discharged to the POTW.

C. Wastewater samples taken for the purpose of determining charges are to be taken by authorized representatives of the director or as otherwise determined by the director. The samples taken shall be 24-hour composite samples, obtained through flow-proportioned composite samples, where feasible. Charges shall be based on analysis of 24-hour flow-proportioned or timed samples. Results from a minimum of two samples shall be averaged for each month. Charges shall be based on the average of results for the month.

D. Sampling procedures and methods to determine the mean wastewater strength for the purpose of determining charges shall be conducted by or under the direction of the director. Samples shall involve a 24-hour flow-proportioning or timed sampling device, where feasible, and be in accordance with methods as prescribed in VMC 14.10.390 and 14.10.400. Sampling shall be conducted at sampling manholes or other locations adjudged by the director to be suitable points from which samples would be representative, either singly or with other samples, of the industrial wastewater to be sampled. Samples shall be analyzed by an accredited laboratory as required by Chapter 173-50 WAC. (Ord. M-4431 § 3, 2023; Ord. M-3970 § 2, 2010)