(a) Grab samples must be used for pH, hexavalent chromium, cyanide, total phenols, oil and grease, sulfide and volatile organics. For sampling required in support of baseline monitoring and 90-day compliance reports required by Section 1044.18, 1044.203 of this chapter, a minimum of four grab samples must be used for pH, hexavalent chromium, cyanide, total phenols, oils and grease, sulfide and volatile organics for facilities for which historical sampling data do not exist; for facilities for which historical sampling data are available, the Authority may authorize a lower minimum. Using protocols (including appropriate preservation) specified in 40 C.F.R. Part 136 and appropriate EPA guidance, multiple grab samples collected during a 24-hour period may be composited prior to the analysis as follows: for hexavalent chromium, cyanide, total phenols and sulfides the samples may be composited in the laboratory or in the field; for volatile organics and oil and grease, the samples may be composited in the laboratory. For all other pollutants, 24 hour composite samples must be obtained through flow proportional composite sample techniques where feasible. The Authority may waive flow proportional composite sampling for any industrial user that demonstrates that flow proportional sampling is infeasible. In such cases, samplings may be obtained through time-proportional composite sampling techniques or through grab samples where the user demonstrates that this will provide a representative sample of the effluent being discharged.
(b) The industrial user shall take a minimum of one representative sample to compile that data necessary to comply with the requirements of this section.
(c) Samples should be taken immediately downstream from pretreatment facilities if such exist or immediately downstream from the regulated process if no pretreatment exists. If other wastewaters are mixed with the regulated wastewater prior to pretreatment, the industrial user should measure the flows and concentrations necessary to allow use of the combined waste stream formula of 40 C.F.R. Part 403.6(c) in order to evaluate compliance with pretreatment standards. Where an alternative concentration or mass limit has been calculated in accordance with 40 C.F.R. 403.6(c), this adjusted limit along with supporting data shall be submitted to the Authority.
(d) Reports of industrial users shall contain all results of sampling and analysis of this discharge, including the flow, the type of sample, and the nature and concentration, or production and mass where required or requested by the Authority, of pollutants contained therein which are limited by the applicable pretreatment standards. The frequency of monitoring by the industrial user shall be as prescribed by the Authority. All analysis shall be performed in accordance with 40 C.F.R. Part 136 and amendments thereto. Where 40 C.F.R. Part 136 does not include a sampling or analytical technique for the pollutant in question, sampling and analysis shall be performed in accordance with the procedures set forth in the EPA publication Sampling and Analysis Procedures for Screening of Industrial Effluents for Priority Pollutants, April, 1977, and amendments thereto, or with any other sampling and analytical procedures approved by the Authority.
(e) If sampling performed by the industrial user indicates a violation, the user shall notify the Authority within 24 hours of becoming aware of the violation. The industrial user shall also repeat the sampling and analysis and submit the results of the repeat analysis to the Authority within 30 days after becoming aware of the violation, whether the violation is detected by the industrial user or Authority personnel, except that no resampling is required if:
(1) The Authority performs sampling at the industrial user at a frequency of at least once per month; or
(2) The Authority performs sampling at the industrial user between the time when the industrial user performs its initial sampling and the time when the industrial user receives the results of this sampling.
(f) If sampling performed by the Authority, in lieu of the industrial user, indicates a violation, the Authority shall repeat the sampling and analysis within 30 days of becoming aware of the violation unless it notifies the user of the violation and requires the user to perform the repeat sampling and analysis.
(g) If an industrial user subject to the reporting requirements of this chapter monitors any pollutant more frequently then required by the Authority, using the procedures prescribed in divisions (a) through (e), the results of this monitoring shall be included in the report.
(Ord. 1991-239, passed 12-2-1991; Ord. 2010-89, passed 4-19-2010; Ord. 2022-203, passed 9-19-2022)