4.4. SR 03-20-2017 - Laserfiche WebLink

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Permit Modified: October 16, 2014 Elk River WWTF Page 19 Permit Expires: hme 30, 2018 Permit #: MN0020788 Chapter S. Domestic Wastewater -- Pretreatment 2. Pretreatment - Permittee Responsibility to Control Users 2.2 The Permittee shall prohibit new discharges of non -contact cooling waters unless there is no cost effective alternative. Existing discharges of non -contact cooling water to the Permittee's wastewater treatment facility shall be eliminated, where elimination is cost-effective, or where an infiltration/inflow analysis and sewer system evaluation survey indicates the need for such removal. 2.3 If the Permittee accepts trucked -in wastes, the Permittee shall evaluate the trucked in wastes prior to acceptance in the same manner as it monitors sewered wastes. The Permittee shall accept trucked -in wastes only at specifically designated points. (Mintz. R. 7049.0149, Subp. 4) 2.4 The Permittee shall prohibit the discharge of the following to its wastewater treatment facility: a. pollutants which create a fire or explosion hazard, including any discharge with a flash point less than 60 degrees C (149 degrees )F); b. pollutants which would cause corrosive structural damage to the POTW, including any waste stream with a pH of less than 5.0; c. solid or viscous pollutants which would obstruct flow; d. heat that would inhibit biological activity, including any discharge that would cause the temperature of the waste stream at the POTW treatment plant headworks to exceed 40 degrees C (104 degrees F); e. pollutants which produce toxic gases, vapors, or fumes that may endanger the health or safety of workers; or f. any pollutant, including oxygen demanding pollutants such as biochemical oxygen demand, released at a flow rate or pollutant concentration that will cause interference or pass through. (Minn. R. 7049.0140) 2.5 Pollutant of concern means a pollutant that is or may be discharged by an industrial user that is, or reasonably should be of concern on the basis that it may cause the permittee to violate any permit limits on the release of pollutants. The following pollutants shall be evaluated to determine if they should be pollutants of concern: pollutants limited in this permit, pollutants for which monitoring is required in this permit, pollutants that are likely to cause inhibition of the Permittee's POTW, pollutants which may interfere with sludge disposal, pollutants for which the Pennittee's treatment facility has limited capacity. (Minn. R. 7049.0120, Subp. 13) 3. Control of Significant Industrial Users 3.1 The Permittee shall impose pretreatment requirements on SIUs which will ensure compliance with all applicable effluent limitations and other requirements set forth in this permit or any federal or state law or regulation limiting the release of pollutants from the POTW. These requirements shall be applied to SIUs by means of an individual control mechanism. (Minn. R. 7049.0609) 3.2 The Permittee shall not knowingly enter into an individual control mechanism with any user that would allow the user to contribute an amount or strength of wastewater that would cause violation of any limitation or requirement in the permit, or any applicable federal, state or local law or regulation. (Minn. R. 7049.0600 Subp. 3) 4. Monitoring of Significant Industrial Users 4.1 The Permittee shall obtain from SIUs specific information on the quality and quantity of the SM's discharges to the Permittee's POTW. Except where specifically requested by the Permittee and approved by the MPCA, this information shall be obtained by means of representative monitoring conducted by the Permittee or by the SIU under requirements imposed by the Permittee in the S1U's individual control mechanism. Monitoring performed to comply with this requirement shal I include all pollutants for which the SlU is significant and shall be done at a frequency commensurate with the significance of the SIU. (Minn. R. 7049.0719)