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Users must provide all samples they collect to satisfy sampling requirements under this chapter are representative of the range of conditions occurring during the reporting period. Users must also provide that, when specified, samples are collected during the specific period.

(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, provided all test method provisions are followed concerning the collection and preservation of the sample.

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

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

(6) The Public Works Director 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 provide the samples are representative of their wastewater discharges and that all samples are collected, preserved, and that appropriate holding requirements are followed according to test methods.

(8) Users sampling to complete baseline monitoring and 90-day compliance reports required by PMC 13.90.350 and 13.90.360 must satisfy some specific requirements. These reports require at least four grab samples for pH, cyanide, total phenols, oil and grease, sulfide and volatile organic compounds. Users may composite samples prior to analysis if allowed in subsection (3) of this section. Where historical sampling data exists, the Public Works Director may also authorize fewer samples.

(9) For periodic monitoring reports (PMC 13.90.380), the Public Works Director may specify the number of grab samples necessary to assess and provide compliance with applicable pretreatment standards and requirements. [Ord. 4169 § 1, 2014; Code 1970 § 13.62.060(J).]