Measurement and testing methods.

Memphis Code of Ordinances § 13-24-48

in effect

Sec. 13-24-48. - Measurement and testing methods. A. Analytical requirements. All pollutant analyses, including sampling techniques, to be submitted as part of a discharge permit application or report(s) shall be performed in accordance with the techniques prescribed in 40 C.F.R. Part 136 and amendments thereto, unless otherwise specified in an applicable categorical pretreatment standard. If 40 C.F.R. Part 136 does not contain sampling or analytical techniques for the pollutant in question, or where the EPA determines that the Part 136 sampling and analytical techniques are inappropriate for the pollutant in question, sampling and analyses shall be performed by using validated analytical methods or any other applicable sampling and analytical procedures, including procedures suggested by the control authority or other qualified parties approved by EPA. B. Representative sample collection. Samples collected to satisfy reporting requirements must be based on data obtained through appropriate sampling and analysis performed during the period covered by the report and be based on data that is representative of conditions occurring during the reporting period. The control authority, subject to its sole discretion, may undertake all or part of the sampling and/or analysis otherwise required by the SIU in lieu of requiring the SIU to undertake the minimum sampling. 1. Except as indicated in subsections (B)(2) and (3) below, the industrial user must collect wastewater samples using 24-hour flow-proportional composite sampling techniques, unless time-proportional composite sampling or grab sampling is authorized by the control authority. Where time-proportional composite sampling or grab sampling is authorized by the control authority, the samples must be representative of the discharge. Using protocols (including appropriate preservation) specified in 40 C.F.R. Part 136, 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 and grease, the samples may be composited in the laboratory. Composite samples for other parameters unaffected by the compositing procedures as documented in approved EPA methodologies may be authorized by the control authority, as appropriate. Notwithstanding anything to the contrary, grab samples may be required to show compliance with instantaneous limits. 2. Samples for oil and grease, temperature, pH, cyanide, total phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques. 3. For sampling required in support of baseline monitoring report and 90-day compliance reports, a minimum of four grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organic compounds for facilities for which historical sampling data do not exist; for facilities for which historical sampling data are available, the control authority may authorize a lower minimum. For the self-monitoring reports required by 13-24-30(E), the industrial user is required to collect the number of grab samples necessary to assess and assure compliance with applicable pretreatment standards and pretreatment requirements. 4. Chain-of-custody forms must be filled out and maintained in the user's files for a period of at least three years. Upon request of the control authority, the chain-of custody forms shall be submitted to the city. C. Approval required to change sampling locations. The control authority may specify user monitoring points. In such a case, compliance monitoring points shall not be changed without the approval of the control authority. D. Monitoring and flow measurement facilities. Wastewater monitoring and flow measurement facilities shall be properly operated, kept clean, and maintained in good working order at all times. The failure of a user to keep its monitoring facility in good working order shall not be grounds for the user to claim that non-compliant sample results are not representative of its discharge. (Ord. No. 5793, §§ 3, 5, 8-17-2021)

Source: City of Memphis, Code of Ordinances and Charter and Related Laws (Municode Library, library.municode.com)URL: https://library.municode.com/tn/memphis/codes/code_of_ordinances?nodeId=TIT13PUSE_CH13-24PR_ART3DIPUSASE_S13-24-48METEMEFetched: 10/28/2026