(A) Analytical requirements. All pollutant analyses, including sampling techniques, to be submitted as part of a wastewater discharge permit application or report shall be performed by a laboratory certified by the state to perform the wastewater analyses in accordance with the techniques prescribed in 40 C.F.R. part 136, unless otherwise specified in an applicable categorical pretreatment standard. If 40 C.F.R. 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 or by the POTW Director. Analyses must be performed by laboratory certified by the state for each parameter analyzed if such certification exists for those parameters.
(B) Sample collection.
(1) All wastewater samples must be representative of the user’s discharge. Wastewater monitoring and flow measurement equipment/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.
(2) Grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide, volatile organic compounds and any other pollutants as required by 40 C.F.R. part 136. The POTW shall determine the number of grabs necessary to be representative of the user’s discharge. See 40 C.F.R. § 403.12(g)(5) for additional grab sample number requirements for baseline monitoring reports (BMR) and 90-day compliance reports. Additionally, the POTW Director may allow collection of multiple grabs during a 24-hour period which are composited prior to analysis as allowed under 40 C.F.R. part 136.
(3) All wastewater composite samples shall be collected with a minimum of hourly aliquots or grabs for each hour that there is a discharge. All wastewater composite samples shall be collected using flow proportional composite collection techniques, unless time-proportional composite sampling or grab sampling is authorized by the POTW Director. When authorizing time-proportional composites or grabs, the samples must be representative and the decision to allow the alternative sampling must be documented.
(4) Tampering, altering or otherwise modifying monitoring equipment or compromising the integrity of any sample shall be a violation of this chapter.
(Ord. passed 10-14-2021)