Where representative samples are required to be taken, a user shall take a minimum of four grab samples for pH, cyanide, phenols (T), residual chlorine, oil and grease, sulfide, and volatile organics (and any other parameters designated by the WWTP Superintendent). For all other pollutants, 24-hour composite samples must be obtained through flow-proportional composite sampling techniques. The WWTP Superintendent may waive flow-proportional composite sampling for any user that demonstrates to the satisfaction of the WWTP Superintendent that flow-proportional sampling is infeasible. If flow-proportional sampling is waived, samples may instead be obtained through time-proportional composite sampling techniques, or through a minimum of four grab samples, if the user demonstrates to the satisfaction of the Superintendent that this will provide a representative sample of the effluent being discharged.
(Ord. 185, passed 4- -2006)