(A) The city shall require to be provided and operated at the significant industrial user’s own expense, monitoring facilities to allow inspection, sampling and flow measurement of the building sewer or internal drainage systems. The monitoring facility will normally be situated on the user’s premises but the city may, when such a location would be impractical and cause undue hardship to the user, allow the facility to be constructed in the public street or sidewalk area and located so that it will not be obstructed by landscaping, parked vehicles, or other activities of the user.
(B) Where required by the city, additional control manholes or sampling chambers shall be provided at the end of each industrial process within an industrial user’s facility suitable for the determination of compliance with pretreatment standards.
(C) Whenever required by a wastewater discharge permit, any significant industrial user shall install a large manhole or sampling chamber for each separate discharge in the building sewer in accordance with plans and specifications approved by the city, installed and maintained at all times at the user’s expense, which shall have ample room in each sampling chamber to permit the city to take accurate composite samples for analysis. The chamber shall be safely, easily, and independently accessible to authorized representatives of the city at any time.
(1) Each sampling chamber shall contain a Palmer-Bowlus flume unless a weir or similar device is approved by the POTW with a recording and totalizing register for measurement of the liquid quantity; or at the discretion of the city the metered water supply to the industrial plant may be used as the liquid quantity where it is substantiated to the city that the metered water supply and waste quantities are approximately the same, or where a measurable adjustment agreed to by the city is made in the metered water supply to determine the liquid waste quantity.
(2) When required, samples shall be taken every hour or half hour, as determined by the city, and properly refrigerated and preserved in accordance with Standard Methods and shall be composited in proportion to the flow for a representative 24-hour sample. Such sampling shall be done as prescribed by the user’s wastewater discharge permit.
(3) The sampling chamber, metering device, and documentation of the frequency of sampling, sampling methods and analyses of samples shall be subject, at any reasonable time, to inspection and verification by the city.
(D) All measurements, tests, and analyses of the characteristics of water and wastes to which reference is made in this chapter shall be determined in accordance with Standard Methods.
(Prior Code, § 51.144) (Ord. 88-9, passed 9-20-1988) Penalty, see § 51.999