§ 15.60.285. Monitoring procedures.

All wastewater samples must be representative of the user's discharge. 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 sample results are unrepresentative of its discharge. If a user subject to the reporting requirement in this section monitors any regulated pollutant at the appropriate sampling location more frequently than required by Metro, using the procedures prescribed in Section 15.60.285, the results of this monitoring shall be included in the report submitted to Metro. Where the categorical pretreatment standard, local limit, or permit requires compliance with a BMP or pollution prevention alternative, the user shall submit documentation as required by Metro or the applicable standards to determine compliance with the standard.

A.

Sample collection and analyses. Samples and measurements taken in compliance with the monitoring requirements of this permit shall be representative of the volume and nature of the monitored discharge during a normal production day and shall be taken as follows:

1.

Be performed on composite and grab samples representative of the total wastewater flow discharged to the Metropolitan Government Sewerage System with the maximum time interval between samples no longer than sixty (60) minutes.

2.

Be conducted in accordance with the U.S. Environmental Protection Agency protocol. The results must be reported to the lowest detectable limit of the methodology. Samples are to be analyzed by a laboratory, certified by Metro Water Services for the required parameters.

3.

Provide the flow rate for which the results are indicative to the nearest 100 gallons per day.

4.

Except as indicated in subsection 15.60.285 A.5. or if designated different in the user's permit, the user must collect wastewater samples using 24-hour flow-proportional composite sampling techniques, unless time-proportional composite sampling or grab sampling is authorized by Metro. Where time-proportional composite sampling or grab sampling is authorized by Metro, the samples must be representative of the discharge. 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 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 Metro as appropriate. In addition, grab samples may be required to show compliance with instantaneous limits.

5.

Samples for oil and grease, temperature, pH, cyanide, total phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques.

6.

For sampling required in support of baseline monitoring and 90-day compliance reports [40 CFR 403.12(g)(4) and Tennessee Rule 1200-4-14-.12(2) and (4)], 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 data do not exist; for facilities for which historical sampling data are available, Metro may authorize a lower minimum. For the reports required by 15.60.270 [40 CFR 403.12(g)(4) and Tennessee Rule 1200-4-14-.12(5) and (8)], the industrial user is required to collect the number of grab samples necessary to assess and assure compliance with applicable pretreatment standards and requirements.

B.

Sample location. All approved sampling shall be collected from the sample collection point as designated in the industrial/municipal user's permit as issued by Metro Water Services.

C.

Test procedures.

1.

Test procedures for the analysis of pollutants shall conform to regulations published pursuant to Section 304 (h) of the Clean Water Act of 1977, under which such procedures may be required.

2.

Unless otherwise noted in the permit, all pollutant analyses, including sampling techniques, to be submitted as part of a wastewater discharge permit application or report shall be performed in accordance with the techniques prescribed in 40 CFR Part 136 and amendments thereto, unless otherwise specified in an applicable categorical pretreatment standard. If 40 CFR 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 Metro or other parties approved by EPA.

(Ord. BL2010-678 § 2, 2010)