28 - Article III Chapter 34 Wastewater Discharge and Disposal Revisions

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pollutants in the discharge which are limited by such pretreatment standards. The user shall collect a minimum of one (1) sample during each six (6) month period ending in June and December, unless required more and perform analyses required by the pretreatment standard for the semi-annual report. The semi-annual report must be received by the supervisor within forty-five (45) days following the end of each six (6) month period. Sampling and analyses to meet federal pretreatment standards does not relieve the user of additional monitoring requirements as may be deemed appropriate by the city. In addition, this report shall include a record of all daily flows which during the reporting period exceeded the average daily flow reported in the compliance date report. ClUs and users are subject to Best Management Practices (BMPs) under a federal a BMP where a required BMP or pollution prevention alternative is part of the categorical standard with each semi-annual report. (b) All non -categorical significant industrial users shall collect a minimum of one (1) sample during each six (6) month reporting period and perforrii analyses for these pollutants deemed appropriate by the city for the semi-annual reporting periods specified in subsection (a). Non - categorical SlUs are required to report data obtained through appropriate sampling and analysis performed during the period covered by the report which data are representative of conditions occurring during the reporting period. Any additional monitoring of pollutants in excess of the minimum of once per six months must be included in the semi-annual report if analyzed in accordance with 40 CFR 136 methods. I kc) The supervisor may impose mass limitations on users which are using dilution to meet applicable pretreatment standards or requirements or, in other cases, where the imposition of mass limitations is appropriate. In such cases, the periodic compliance report shall indicate the mass of pollutants regulated by pretreatment standards in the effluent of the user. These reports shall contain the results of sampling and analysis of the discharge, including the flow and the nature and concentration, or productions and mass where requested by the supervisor, of pollutants contained herein which are limited by the applicable pretreatment standards. The frequency of monitoring shall be at the discretion of the city. All analysis, shall be performed in accordance with procedures established by the EPA pursuant to Section 304(g) of the Act and contained in 40 CFR, Part 136, and amendments thereto or with any other test procedures approved by the EPA. Sampling shall he performed in accordance with the techniques approved by the EPA. Sec. 34-80. - Confidential information. ,a) It shall be the policy of the city not to require or accept confidential information from industrial users unless necessary to meet state or federal requirements or to stop or prevent interference or damage to the POTW. Any information furnished to the city by an industrial user which the user considers confidential shall be clearly marked or stamped "confidential business information" on each page containing such information. Information and data on a wmm�