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A. The Director may make whatever tests are necessary to carry out a planned sampling program and to make whatever analyses are needed for all commercial and industrial users. The BOD test is considered the standard test; however, COD or TOC tests may be substituted in cases where the Director determines that the BOD test is not representative of actual wastewater loading. Wastewater characteristics are determined by the Department on the basis of monitored wastewater discharged, a certified statement from the user, or on the best available data as to the characteristics of such discharges.

B. Any change in the ongoing process(es) employed by a user contributing commercial or industrial waste that results in a variation of more than 25 percent in one or more of the effluent loading concentrations must be reported by the user to the Director within 30 days of implementing that change.

C. If the Director determines through testing that a significant variation exists between the user’s certified data and the discharge characteristics monitored by the Department, the Director may adjust the sewer use charge based on the monitored data from the original date of certification, unless written communication was received from the user notifying the Director of changes in loading and giving specific dates of the changes.

D. Designated discharge. Where sampling and gauging of specific user discharge is not practical for physical, economic, safety, or other reasons, the Director may designate values for concentrations of the wastes discharged into the sewer system for all users in the same Standard Industrial Classification or subclassification. (Ord. No. G-1935, § 2; Ord. No. G-2213, § 3; Ord. No. G-6740, § 1, 2020)