932.19 MONITORING AND ANALYSIS.
(a) For facilities for which historical sampling data do not exist, a minimum of four grab samples shall be used for pH, cyanide, total phenols, oil and grease, sulfide and volatile organics. For facilities for which historical sampling data are available, the District may authorize a lower minimum. For all other pollutants, twenty-four hour composite samples shall be obtained through flow proportional composite sampling techniques where feasible. The District 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 a minimum of four grab samples (composited) where the user demonstrates that this will provide a representative sample of the effluent being discharged. Using protocols (including appropriate preservation) specified in 40 CFR Part 136 and appropriate EPA guidance, multiple grab samples collected during a twenty-four hour period may be composited prior to analysis as follows: for 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.
(b) The industrial user shall perform a minimum of one representative sampling event to comply with the requirements of this section.
(c) If sampling performed by the industrial user indicates a violation, the user shall notify the District within twenty-four hours of becoming aware of the violation. The user shall also repeat the sampling and analysis and submit the results of the repeat analysis to the District within thirty days after becoming aware of the violation. Where the District has assumed responsibility for sampling in lieu of the industrial user, it is the District that shall repeat the sampling and analysis within the thirty days of becoming aware of the violation.
(d) Reports of dischargers shall contain all results of sampling and analysis of the discharge, including the flow, the type of sample and the nature and concentration, or production and mass where required by the District. The frequency of monitoring by the discharger shall be as prescribed in the wastewater discharge permit. All analysis shall be performed in accordance with 40 CFR, Part 136 and amendments thereto. Where 40 CFR, 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 Deputy Director.
(e) If an industrial user subject to the reporting requirement in Sections 932.14, 932.15, 932.17 or 932.18 monitors any pollutant in its process wastewater discharge at the permitted monitoring location more frequently than required by the District, using the procedures prescribed in this section, the results of this monitoring shall be included in the report. (Ord. 08-217. Passed 10-15-08.)