The Plant Manager or his authorized agents may inspect the monitoring facilities of any discharger to determine compliance with the requirements of this chapter. The discharger shall allow the Manager or his authorized agents, upon presentation of credentials of identification to enter upon the premises of the discharger at all reasonable hours, for the purposes of inspection, sampling or records examination. The Manager shall have the right to set up on the discharger's property such devices as are necessary to conduct sampling, inspection, compliance monitoring and/or metering operations.
Sample Analysis
(a) All collected samples must be of such nature that they provide a true and accurate representation of the industry’s normal workday effluent quality.
(b) Chain-of-custody procedures, sample preservation techniques, and sample holding times recommended by EPA shall be followed in all self-monitoring activities.
(c) Monitoring shall be performed at the approved monitoring station on the effluent sewer. Location and design of the monitoring station shall be subject to the review and approval of the City Engineer. Any change in monitoring location will be subject to the approval of the City Engineer.
(d) All analyses shall be performed in accordance with procedures established by EPA under the provisions of Section 304(h) of the Act [33 USC 1314(h)] and contained in 40 CFR, Part 136, and amendments thereto or with any other test procedures approved by EPA or the City. Sampling shall be performed in accordance with the techniques approved by EPA or the City.
(e) Except as indicated in subsections (f) and (g) below, the User must collect wastewater samples using flow proportional composite sampling techniques, unless time-proportional composite sampling or grab sampling is authorized by the Plant Manager. Where time-proportional composite sampling or grab sampling is authorized, 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 analysis as follows: for hexavalent chromium, cyanide, total phenols, and sulfides, the samples may be composited in a 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 Plant Manager, as appropriate. In addition, grab samples may be required to show compliance with instantaneous limits.
(f) Samples for oil and grease, temperature, pH, cyanide, total phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques. Alternatively, pH compliance may be assessed through the use of a strip-chart or a circular chart over the monitoring period from a continuous pH recorder, at the discretion of the Plant Manager.
(g) For sampling required in support of baseline monitoring and initial compliance reports required in Section 925.38 and 40 CFR 503.12(b) and (d), a minimum of four grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfides, and volatile organic compounds for facilities for which historical sampling data do not exist. For facilities for which historical sampling data are available, the Plant Manager may authorize a lower minimum. For reports required by Section 925.38 and 40 CFR 403.12(e) and (h), the Industrial User is required to collect the number of grab samples necessary to assess and assure compliance with applicable Pretreatment Standards.
(h) If a violation is detected through sampling and analysis conducted by a City in lieu of the Industrial User, the City shall perform the repeat 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.
(Ord. 140-2012. Passed 1-22-13.)