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(1) Wastes discharged into the public sewers shall be subject to periodic inspection and a determination of character and concentration. For wastes discharged by users with an effective industrial waste discharge permit, the determinations shall be made at least annually with the option for more frequent intervals if any pollutant potentially exceeds any limit established by this chapter. Sampling shall be carried out by customarily accepted methods to reflect the effect of pollutants upon the treatment plant and to determine the existence of hazardous conditions defined elsewhere in this chapter.

Samples of wastewater being discharged into the sewer system shall be representative of the discharge and shall be taken after treatment. The sampling method shall be one approved by the WRD Manager and done in accordance with good engineering practice.

Except as indicated below, wastewater samples collected for the purposes of determining industrial user compliance with pretreatment standards and requirements must be obtained using flow proportional composite collection techniques. In the event flow proportional sampling is infeasible, the WRD Manager may authorize the use of time proportional sampling.

(a) Samples for oil and grease, temperature, pH, cyanide, phenols, toxicity, sulfides, and volatile organic chemicals must be obtained using grab collection techniques.

(b) Samples that are taken by the authority of the WRD Manager for the purposes of determining compliance with the requirements of this chapter shall be split with the WRD Manager and the industrial user (or a duplicate sample provided in the instance of fats, oils, and greases) if requested before or at the time of sampling.

(2) The WRD Manager may require waste sampling and monitoring by the user at the user’s expense if information and/or data is needed to determine compliance with pretreatment standards, determine the treatability of the waste, establish a sewer rate charge, or determine any other factor which is related to the operation and maintenance of the sewer system. The locations, frequencies, and types of sampling and monitoring shall be determined by the WRD Manager.

[Replaced Sec. 2 (Exh. A), Ord. No. 2021-13, Feb. 18, 2021.]