The collection of samples of wastewater for the measurement of constituents controlled by federal pretreatment standards shall be at the end of the industrial process sewer line, or after pretreatment of combined process flows, and prior to the addition of diluting waters, if feasible, and shall be determined at the control manhole or upon suitable samples taken at said control manhole. In the event no special manhole has been required, the control manhole shall be considered to be the nearest access determined as suitable by the city.

All sampling and analysis to be performed by the industrial users shall be performed in accordance with the techniques prescribed in 40 CFR 136 and amendments thereto, otherwise approved by the EPA, or as specified by the city. (Ord. 2282 NCS §3 (part), 2007.)