(1) Users must use properly cleaned sample containers appropriate for the sample analysis and sample collection and preservation protocols specified in 40 CFR Part 136 and appropriate EPA guidance.

(2) Users must obtain samples for oil and grease, temperature, pH, cyanide, total phenols, sulfides, and volatile organic compounds using grab collection techniques.

(3) For certain pollutants, users may composite multiple grab samples taken over a 24-hour period. Users may composite grab samples for cyanide, total phenols, and sulfides either in the laboratory or in the field, and may composite grab samples for volatile organics and oil and grease in the laboratory prior to analysis.

(4) For all other pollutants, users must employ 24-hour flow-proportional composite samplers unless the Public Works Superintendent authorizes or requires an alternative sample collection method.

(5) The Public Works Superintendent may authorize composite samples for parameters unaffected by the compositing procedures, as appropriate.

(6) The Public Works Superintendent may require grab samples either in lieu of or in addition to composite sampling to show compliance with instantaneous discharge limits.

(7) In all cases, users must take care to ensure the samples are representative of their wastewater discharges. (Ord. 445-N, §1, 2014)