(A) Representative samples required. All wastewater samples must be representative of the contributor's discharge. Wastewater monitoring and flow measurement facilities shall be properly operated, kept clean and maintained in good working order at all times. If a contributor fails to keep its monitoring facility in good working order, it may not claim that sample results are unrepresentative of its discharge.
(B) Grab samples. 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 town shall determine the number of grabs necessary to be representative of the contributor's discharge. See 40 C.F.R. part 403.12(g)(5) for additional grab sample number requirements for BMR and 90-day compliance reports. Additionally, the POTW Director may allow collection of multiple grabs during a 24-hour period that are composited prior to analysis, as allowed under 40 C.F.R. part 136.
(C) Composite samples. All wastewater composite samples shall be collected with at least hourly aliquots or grabs for each hour in which 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.
(Ord. passed 6-21-2011; Am. Ord. passed 12-13-2012)