§ 51.088 MONITORING REQUIREMENTS.
   (A)   The city shall require significant industrial users to provide and operate, at the user’s own expense, monitoring facilities to allow inspection, sampling and flow measurement of the building sewer and/or internal drainage system. The monitoring facility should normally be situated on the user’s premises, but the city may, when such a location would be impractical or cause undue hardship on the user, allow the facility to be constructed in a public right-of-way. The pretreatment coordinator shall review and approve the location plans and specifications for the monitoring facilities and may require them to be constructed to provide for the separate monitoring and sampling of industrial waste and sanitary sewage flows. There shall be ample room in or near the sampling manhole or facility to allow accurate sampling and preparation of samples for analysis. The facility and sampling and measuring equipment shall be maintained at all times in a safe and proper operating condition at the expense of the user.
   (B)   Whether constructed on public or private property, the sampling and monitoring facilities shall be provided in accordance with the city’s requirements and all applicable local construction standards and specifications. Construction shall be completed within 90 days following approval of the location plans and specifications.
   (C)   All sampling analyses done in accordance with approved U.S. EPA procedures by the significant industrial user during a reporting period shall be submitted to the pretreatment coordinator regardless of whether or not that analysis was required by the user's discharge permit.
   (D)   The significant industrial user must receive the approval of the pretreatment coordinator before changing the sampling point and/or monitoring facilities to be used in all required sampling.
   (E)   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, based on data that is representative of conditions occurring during the reporting period.
      (1)   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 the pretreatment coordinator. Where time-proportional composite sampling or grab sampling is authorized by the GWSC, the samples must be representative of the discharge. Using protocols (including appropriate preservation) specified in 40 C.F.R. 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 volative 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 GWSC, as appropriate. In addition, 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 and 90-day compliance reports required in 40 C.F.R. § 403.12(b) and (d), 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 are available, the pretreatment coordinator may authorize a lower minimum. For the reports required, the industrial user is required to collect the number of grab samples necessary to assess and assure compliance with applicable pretreatment standards and requirements.
(1989 Code, § 52.074) (Ord. 1619, passed - -1984; Am. Ord. 1948, passed 3-9-1992; Am. Ord. 2752, passed 7-25-2011)