(A) Except as indicated in divisions (B) and (C) below, the IU shall collect wastewater samples using 24-hour flow proportional composite sampling techniques. In the event flow proportional sampling is infeasible, the director may authorize the use of time proportional sampling or a minimum of four grab samples where the IU demonstrates that this will provide representative samples of the effluent being discharged and the decision to allow the alternative sampling must be documented in the IU file for that facility. In addition, grab samples may be required to show compliance with instantaneous limits.
(B) Samples for oil and grease, temperature, pH, cyanide, phenols, sulfides and volatile organic compounds must be obtained using grab collection techniques. At least four samples for volatile organic compounds must be collected at least four hours apart in a 24-hour period. Using protocols (including appropriate preservation) specified in Chapter 62-160, F.A.C, and DEP-SOP-001/01, multiple grabs collected during a 24-hour period shall be composited in the laboratory prior to analysis.
(C) Oil and grease samples shall be collected in accordance with division (B) above unless the sampling location or point cannot be physically accessed to perform a direct collection of a grab sample. In these instances, the sample shall be pumped from the sampling location or point into the sample container using a peristaltic-type pump. All pump tubing used for sample collection must be new or pre-cleaned and must be changed between sample containers and sample points. The pump tubing shall not be pre-rinsed or flushed with sample prior to collecting the sample. The report of analysis shall indicate that a peristaltic pump was used to collect the oil and grease sample.
(D) The IU shall take a minimum of one representative sample to compile the data necessary to comply with the requirements of this section.
(E) Samples shall be taken immediately downstream from pretreatment facilities if such exist or immediately downstream from the regulated process if no pretreatment exists. If other wastewaters are mixed with the regulated wastewater prior to pretreatment the IU shall measure the flows and concentrations necessary to allow use of the combined wastestream formula in 62-625.410(6), F.A.C, to evaluate compliance with the pretreatment standards. Where an alternate concentration or mass limit has been calculated, in accordance with § 54.31, this adjusted limit along with supporting data shall be submitted to the director.
(F) All pollutant analyses, including sampling techniques, to be submitted as part of a report, wastewater discharge permit, or permit application shall be performed in accordance with the techniques prescribed in 40 CFR Part 136 and Chapter 62-160, F.A.C., unless otherwise specified in an applicable pretreatment standard. If 40 CFR Part 136 does not contain sampling or analytical techniques for the pollutant in question, sampling and analyses must be performed in accordance with procedures approved by EPA and FDEP. All laboratory analytical reports prepared by the IU or the control authority shall comply with 62-160.340, F.A.C.
(G) At the discretion of the director, sampling and analysis may be performed by the control authority in lieu of the IU. Where the control authority itself chooses to collect all the information required for the reports in § 54.101, and §§ 54.104 through 54.106, including flow data, the IU shall not be required to submit the report, in accordance with 62-625.600(6)(7)(b), F.A.C.
(H) Samples collected to satisfy reporting requirements in, § 54.101, and §§ 54.104 through 54.106 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. The control authority shall require a frequency of monitoring necessary to assess and assure compliance by IUs with applicable pretreatment standards and requirements.
(1) For IUs where historical sampling data do not exist, a minimum of four grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide and volatile organic compounds.
(2) For IUs where historical sampling data are available, the control authority may authorize a lower minimum.
(Ord. 679, passed 9-26-2017)