(a) Reporting required must be based upon data obtained through appropriate sampling and analysis performed during the period covered by the report, which data are representative of conditions occurring during the reporting period. Grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organic compounds. For all other pollutants, 24-hour composite samples must be obtained through flow-proportional composite sampling techniques, unless time-proportional composite sampling or grab sampling is authorized by the City. Where time-proportional composite sampling or grab sampling is authorized by the City, the samples must be representative of the Discharge and the decision to allow the alternative sampling must be documented in the Industrial User file for that facility or facilities. Using protocols (including appropriate preservation) specified in 40 CFR 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 cyanide, total phenols, and sulfides the samples may be composited in the laboratory or in the field; for volatile organics and oil & grease the samples may be composited in the laboratory. Composite samples for other parameters unaffected by the composting procedures as documented in approved EPA methodologies may be authorized by the City, as appropriate.
(b) All analyses shall be performed in accordance with procedures established by the USEPA pursuant to Section 304(h) of the Act and contained in 40 CFR Part 136 and amendments thereto or with any other test procedures approved by the USEPA. (See §§ 136.4 and 136.5). Sampling shall be performed in accordance with the techniques approved by the USEPA. Where 40 CFR Part 136 does not include sampling or analytical techniques for the pollutants in question, or where the USEPA determines that the Part 136 sampling and analytical techniques are inappropriate for the pollutant in question, sampling and analyses shall be performed using validated analytical methods or any other sampling and analytical procedures, including procedures suggested by the POTW or other parties, approved by the USEPA.
(c) For sampling required in support of baseline monitoring and 90-day compliance reports required in 40 CFR 403.12(b) and (d), a minimum of four (4) grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide and volatile organic compounds for facilities for which historical sampling does not exist; for facilities for which historical sampling data are available, the Superintendent may authorize a lower minimum. For the reports required by 40 CFR 403.12(e) and 403.12(h), the Industrial User is required to collect the number of grab samples necessary to assess and assure compliance by and with applicable Pretreatment Standards and Requirements.
(d) In the event flow proportional sampling is infeasible, the City may authorize the use of time proportional sampling or a minimum of four (4) grab samples where the user demonstrates that this will provide a representative sample of the effluent being discharged. In addition, grab samples may be required to show compliance with instantaneous discharge limits.
(e) Samples collected by the City for the purpose of determining compliance by industrial users shall be split and a portion given to the industrial user upon request. The City will bill the user appropriately for the cost of sampling and analyses performed to determine compliance.
(f) The City may require the user to install monitoring equipment as necessary. The facility's sampling and monitoring equipment shall be maintained at all times in a safe and proper operating condition by the user at its own expense. All devices used to measure wastewater flow and quality shall be calibrated as needed to ensure their accuracy.
(Ord. 07-14. Passed 1-13-14.)