Any sampling or analysis done as part of the reports required by these rules and regulations shall be performed as follows:
(a) All measurements, tests, and analyses of the characteristics of water and wastes to which reference is made in these rules and regulations shall be determined at the control manhole provided unless otherwise specified in the industrial user' s wastewater discharge permit. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected. If other wastewaters are mixed with the regulated wastewater prior to pretreatment the user should measure the flows and concentrations necessary to allow use of the combined wastestream formula in 40 CFR 403.6(e) to evaluate compliance with the Pretreatment Standards.
(b) Except as indicated in subsection (c) and (d) below, 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 Director. Where time-proportional composite sampling or grab sampling is authorized by the Director, 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 hexavalent chromium, 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 Director, as appropriate. In addition, grab samples may be required to show compliance with instantaneous limits.
(c) Samples for oil and grease, temperature, pH, hexavalent chromium, cyanide, total phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques.
(d) For sampling required in support of baseline monitoring and 90-day compliance reports required in Sections 915.302 and 915.304 (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 data do not exist; for facilities for which historical sampling data are available, the Director may authorize a lower minimum. For the reports required by paragraphs Section 915.305 (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 with applicable Pretreatment Standards and Requirements.
(e) The industrial user shall take a minimum of one representative sample, as defined in the previous item, to compile that data necessary to comply with the requirements of this section.
(f) If sampling performed by an industrial user indicates a violation, the user shall notify the Director within twenty-four hours of becoming aware of the violation. The user shall also repeat the sampling and analysis and submit the results of the repeat analysis to the Director within thirty days after becoming aware of the violation whether the violation is detected by sampling performed by the user or City personnel.
(g) Reports of industrial users shall contain all results of sampling and analysis of the discharge, including the flow, the type of sample, and the nature and concentration, or production and mass where required by the Director. The frequency of monitoring by the industrial user shall be as prescribed in the wastewater discharge permit. All analyses, including sampling techniques, shall be performed in accordance with 40 CFR Part 136 and amendments thereto. Where 40 CFR Part 136 does not include a sampling or analytical technique for the pollutant in question, or where EPA determines that the Part 136 sampling and analytical techniques are inappropriate for the pollutant in question, sampling and analysis shall be performed by using validated analytical methods, or with any other applicable sampling and analytical procedures, including procedure approved by the Chairman of the Water Pollution Control Board.
(i) Conflict of Laboratory. In the event that analysis of pollutional parameters or flow gauging by the City does not agree with an analysis conducted by the industrial user, a program of re-sampling and re-gauging with subsequent chemical determinations may be instituted. However, the industrial user shall agree to bear all costs to complete the program. In such cases, the City shall schedule the operation as soon as possible, but not to interfere with scheduled operations. All analytical results so found shall be current and no retroactive refunds will be made for any differential in concentrations established as follows:
(1) Request for re-sampling. The industrial user must submit a written request for re-sampling and re-gauging and subsequent chemical determinations of the wastes to the Director.
(2) Setting up re-sampling. The chemist or engineer employed by the industrial user, responsible for the analysis submitted to the City, shall confer with the Director of Water Pollution Control.
(3) Breakdowns in equipment. In the event an analysis of wastes, determined from the routine scheduled sampling and gauging of wastes from an industrial user, is not considered representative because of breakdown of manufacturing processes, or of treatment or pretreatment facilities during the operation, and such breakdown or conditions are accepted by the Director as legitimate reasons the person or industry can request a re- sampling or re-gauging of the wastes after the breakdowns are remedied.
(4) Improperly maintained pretreatment. It shall be assumed by the City that any industrial user has treatment or pretreatment facilities and any routine scheduled sampling and gauging operations conducted at any time shall be considered representative. Therefore, in the course of several routine scheduled sampling and gauging operations the industrial user claims that the results of such sampling and gauging are not representative because of breakdown (or other interruption) of the treatment or pretreatment facilities, then the City shall assume that such facilities are in fact not being properly maintained and the results of the sampling and gauging operations shall be used for purposes of determining the sewerage surcharge, or violations fully at the discretion of the City and until such time as another routine scheduled sampling and gauging operation shall be conducted.
(j) The Director may require an industrial user to install flow monitoring facilities, instruments, and recordings devices to enable accurate measurement of flows as determined to be necessary. (Ord. 30-14. Passed 3-3-14.)