Sec. 24-43(1). Pretreatment of Industrial Waste water.
An industrial wastewater pretreatment system or device may be required by the director to treat industrial flows prior to discharge to the sewer when it is necessary to restrict or prevent the discharge of certain waste constituents to the sewer system, to smooth out peak flow rates, or to accomplish any pretreatment required by the director. All pretreatment systems or devices shall be approved by the director, but such approval shall not absolve the industrial discharger of the responsibility of meeting any industrial effluent limitation set by the director.
A gravity separation interceptor, equalizing tank, neutralizing chamber, and control manhole will be required to remove prohibited settleable and flotable solids, to equalize wastewater streams varying greatly in quantity and/or quality, to neutralize low or high pH flows, and to facilitate inspection, flow measurements and sampling, respectively. Floor drains from commercial or manufacturing buildings, warehouses, or multiuse structures shall not discharge directly to the sewer, but shall first discharge to a gravity separation interceptor.
Sec. 24-43(2). Separation of Domestic and Industrial Wastewaters. Wastewater from sanitary plumbing fixtures, including, but not limited to, restrooms, showers and drinking fountains, shall be kept separate from industrial wastewaters until the industrial wastewater passes through any required pretreatment device and the control manhole, unless the wastes are compatible with the pretreatment process.
Sec. 24-43(3). Control Manhole. The director may require a control manhole of a design approved by the director in accordance with adopted standards to be furnished and installed by major industrial wastewater dischargers to facilitate inspection, sampling and flow measurement by department personnel. Any required control manhole shall be located such that it is accessible at all times. When it is necessary to install a control manhole within a fenced-off area, the department's monitoring and inspection personnel shall have access to the manhole through an adjacent locked gate for which the department shall have keys. All control manholes shall be kept free from obstructions which prevent entering the manhole and shall be maintained to permit safe entry and working conditions. Major industrial wastewater dischargers may be required to install flow metering equipment in the control manhole. This equipment must be maintained in proper working condition and calibrated regularly to maintain accuracy.
Sec. 24-43(4). Annual Treatability Charge. An annual treatability charge or a charge per unit of offending constituent as established shall be paid by persons discharging industrial wastes which result in unusual operation and maintenance costs to the department which are not accounted for by normal unit charges for volume, suspended solids and COD under the sewer user fee system. Examples of such constituents are excessive peak flows, excessive chlorine demand, excessive immediate oxygen demand, etc. Such charges shall be reasonably calculated to defray the costs attributable to such wastes. If there is a substantial change in the strength, volume, or delivery flow rate characteristics introduced into the treatment works by an industrial user, such users' share shall be adjusted accordingly.
Sec. 24-43(5). Sampling and Metering Waste Discharges.
Industrial waste discharges shall be periodically sampled to determine quality and/or metered to determine quantity. The frequency of required sampling and/or metering of discharge volumes shall be stated on the industrial discharge permit in accordance with the nature of the wastes discharged and policies set by the director. Major industrial waste discharges shall be sampled to determine quality and metered to determine quantity, no less than annually. Samples shall be collected in such a manner as to be representative of the composition of the wastes. Samples shall be iced or preserved by methods approved by the director. Samples shall be analyzed for the constituents stated on the permit by an independent laboratory approved by the director or by the department's wastewater laboratory. The person discharging shall pay all costs of sampling and analyzing samples, whether or not the analyses are performed by a private laboratory or by the department. A person discharging wastes may request that the analysis be performed by the department's laboratory, but such requests may be refused due to the lack of manpower or testing apparatus.
The director may at any time sample and/or analyze industrial waste discharges in lieu of required sampling by the person discharging. A charge for sampling and/or analysis by the department's laboratory will be set by the director; and such charges shall be paid by the person discharging the wastes, whether the sampling and/or analyses are in lieu of required samples or are requested by the person discharging in fulfillment of his permit requirements.
(Ord. No. 4672, § 5, 6-20-77)