(A) Each person discharging industrial wastes into a public sanitary sewer with a daily total in excess of 25 pounds of either BOD or suspended solids may, at his or her option, or shall, when directed by the city, construct and maintain an approved control manhole, together with such flow measurement flow sampling, and sample storage facilities for all waste entering the public sewer as may be required by the secretary. These facilities will be used to obtain flow, BOD, and suspended solids data for use as a basis for an industrial waste sewer service charge.
(B) In lieu of directing the construction of measurement sampling and sample storage facilities, the secretary may require that each person discharging industrial wastes into a public sanitary sewer which has a daily total in excess of 25 pounds of either BOD or suspended solids to procure and test at the person’s expense and in a manner approved by the secretary, sufficient composite samples on which to base and compute the person’s industrial waste sewer service charge. In the event that automatic flow measurement, sampling, and sample storage facilities are not provided, the industrial waste charge shall be computed using the metered water flow to the premises as a basis for waste flow and the laboratory analysis of samples procured as directed by the secretary as a basis for computing BOD and suspended solids content of the wastes. Metered water flow shall include all water delivered to or used on the premises and which is discharged to the city sanitary sewer. In the event that private water supplies are used, they shall be metered at the person’s expense. Cooling waters or water not discharged to a sanitary sewer shall be separately metered at the person’s expense and in a manner approved by the secretary prior to allowing deduction of such flow from the total water used on the premises in computing the industrial waste sewer service charge.
(C) Persons discharging industrial wastes into a sanitary sewer with a daily total of 25 pounds or less of either BOD or suspended solids shall have the option of installing measurement and sampling facilities for the purpose of receiving an industrial waste sewer service charge based on quantity and strength of the waste, or may elect to have their sewer service charge based on the commercial sewer service rate established by the city. The city may determine, by at least three composite waste samples during a year, if a waste discharged to the sanitary sewers, based on either BOD or suspended solids, exceeds 25 pounds per day. If three consecutive measurements by the city indicate that the 25 pound per day rate is being exceeded, then the options for installation of measurement and sampling equipment shall apply.
(Ord. 46, passed 4-8-1975)