4.4. SR 03-20-2017 - Laserfiche WebLink

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Pumit Modified: ontober 16, 2014 Elk River WWTF Page 13 Permit Expires- June 30, 2018 Permit #: MN0020788 Chapter 2. Mercury Minimization Plan 1. Mercury Pollutant Minimization Plan 1.3 The Permittee shall submit a Mercury Minimization Plan by 180 days after permit issuance. At a minimum, the MMP must include the following: a) A Summary of mercury influent and effluent concentrations and biosolids monitoring data using the most recent five years of monitoring data, if available. b) Identification of existing and potential sources of mercury concentrations and/or loading to the facility. As appropriate for your facility, you should consider residential, institutional, municipal, and comunercial sources (such as dental clinics, hospitals, medical clinics, nursing homes, schools, laundries, and industries with potential for mercury contributions). You should also consider other influent mercury sources, such as stormwater inputs, ground water (inflow & infiltration) inputs, lift station components, and waste streams or sewer tributaries to the wastewater treatment facility. c) An evaluation of past and present WWTF operations to determine those operating procedures that maximize mercury removal_ d) A summary of any mercury reduction activities implemented during the last five years. e) A plan to implement mercury management and reduction measures during the next five years. Chapter 3. Whole Effluent Toxicity (WET) Testing - Acute 1. General Requirements 1.1 The Permittee shall conduct annual acute toxicity test batteries on. Outfall SD001 beginning with the issuance date of the permit. The first set of annual results is due the last day of the first full calendar quarter following permit issuance and annually thereafter. (For example, if the permit is issued April 28, the test results are due on or before September 30 of each following year.) 1.2 This permit does not include an acute whole effluent toxicity limit; however the facility is required to conduct acute toxicity tests for Outfall SD001. Results of acute toxicity tests will be evaluated against a monitoring threshold value of 0.9999 TUa. 2. Species and Procedural Requirements 2.1 Test organisms for each test battery shall include the fathead minnow (Pimephales prornelas)-Method 2001.0, Ceriodaphnia dubia-Method 2002.0, and Daphnia magna -Method 2021.0. 2.2 Any other circumstances not addressed in the previous requirements or that require deviation from that specified in the previous requirements shall first be approved by the MPCA. 2.3 Tests shall be conducted in accordance with procedures outlined in EPA. -821-R-02-412 "Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms" - Fifth Edition (Acute Manual) and any revisions to the Manual. Any test that is begun with an effluent sample that is equal to or exceeds a total ammonia concentration of 5 mg/I shall use the carbon dioxide -controlled atmosphere technique to control pH drift. 2.4 All effluent samples shall be flow proportioned, 24-hour composite samples. 'Test solutions shall be renewed daily. Testing of the effluent shall begin within 36 hours of sample collection. Receiving water collected outside of the influence of discharge shall be used for dilution and controls. 2.5 Static renewal acute serial dilution tests of the effluent shall consist of a control 12.5%, 25%, 50%, 75% and 100 Percent effluent.