§ 41-32. Devices and testing required of industry.

(a)

Grease and oil traps. The industrial user shall provide for the proper handling of liquid wastes containing grease in excessive amounts, sand, or other heavy solids. The SIU shall provide traps of a type and capacity approved by the director and shall locate them as to be readily and easily accessible for cleaning and inspection.

(b)

Process flow water meters. The industrial user or owner shall install and maintain in working order, a separate isolated meter for the purpose of monitoring process water used in all its industrial or manufacturing processes. This meter is in addition to the water meter mentioned in subsection (g) of this section.

(c)

Backflow preventer. The industrial user or owner shall install and maintain in working order a chemical resistant industrial grade backflow prevention device on the process water supply line so as to prevent possible back-siphoning of industrial process waters or chemicals back into the potable water supply. The user or owner shall make this devise readily accessible for testing by city personnel. A six-inch air-gap between potable water lines and any process waters may be substituted for a backflow preventer.

(d)

Control manhole. The industrial user or owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of the wastes. The industrial user shall locate the manhole so that it is safely accessible without restriction and shall construct it in compliance with plans approved by the director. The owner or user shall install the manhole at his or her expense and maintain it so that it is safe and accessible at all times.

(e)

Test for strength of industrial wastes. The city may determine wastewater flow and concentration of constituents in whatever manner it designates. The time of selection as well as the number and type of the sample(s) shall be at the sole discretion of the city. All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this chapter may be determined in compliance with 40 CFR Part 136 or methods approved by EPA or other agencies that have EPA approval authority for establishing methods for testing and analysis. These measurements, tests, and analyses may be determined at the control manhole provided, or upon suitable samples taken at the control manhole or at any other manhole considered by the director as appropriately isolated. Sampling may be carried out by methods specified in the latest edition of 40 CFR Part 136 to reflect the effect of constituents upon the sewage works of the city and to determine the existence of hazards to health, life, limb, and property. The director, guided by the particular analyses involved, may determine whether a twenty-four-hour composite sample from all outfalls of an industrial user is appropriate or whether a grab sample or samples should be taken. If any owner so wishes, flow determinations may be made by a wastewater meter installed and maintained at the sampling station at the user's expense. The director may include calibration requirements in the user's permit.

(f)

Cost of tests. Each permitted industry that does not discharge wastewater in excess of two hundred fifty (250) mg/l BOD or suspended solids shall compensate the city for the cost of sampling, laboratory analysis, and administrative cost required for monitoring discharges to comply with city, state or federal effluent standards. For industries that discharge BOD and suspended solids in excess of two hundred fifty (250) mg/l, the above cost will be included in their surcharge billing as outlined in this chapter.

(g)

Isolated water and sewer service. A significant industrial user shall provide an isolated water service, controlled by a city-owned and maintained water meter. In addition, the significant industrial user (SIU) shall provide an isolated sewer service so that its industrial wastewaters can be monitored. The SIU shall install a city-approved control manhole on the isolated sewer service. The SIU shall pay for installation, maintenance and operation of the control manhole, unless that fee is waived by the director.

(Ord. No. 8140, § 1, 3-20-03)