4.4. SR 03-20-2017 - Laserfiche WebLink

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Permit Modified: Wober. 16, 2014 Elk Rimer WWTF Page 14 Permit } xpires: June 30, 2018 Permit 4: "0020788 Chapter 3. Whole Effluent Toxicity (WET) Testing - Acute 3. Quality Control and Report Submittals 3.1 Any test that does not meet quality control measures, or results which the Permittee believes reflect an artifact of testing shall be repeated within two (2) weeks. These reports shall contain information consistent with the . report preparation section of the Acute Manual. The MPCA shall make the final determination regarding test validity. 4. Positive Toxicity Result for WET 4.1 Should a test exceed 0.9999 TUa for whole effluent toxicity based on results from the most sensitive test species, the Permittee shall conduct two repeat test batteries on all species. The repeat tests are to be completed within forty-five (45) days after completion of the positive test. These tests will be used to determine if toxicity exceeding 0.9999 TUa remains present for any test species. For both retests, if no toxicity is present above 0.9999 TUa for any test species, the Permittee shall return to the test frequency specified by the permit. If either of the repeat test batteries indicate toxicity above 0.9999 TUa for any test species, the Permittee shall submit for MPCA review a plan for conducting a Toxicity Reduction Evaluation (TRE) including the Facility Performance Review (to be submitted to the MPGA WQ Submittals Center within 60 days after the toxicity discovery date), and at a minimum, provide quarterly reports, starting from the date of TRE plan submittal, regarding progress towards the identity, source, and any plans for the removal of the toxicity. The TRE shall be consistent with EPA guidance or subsequent procedures approved by the MPCA in attempting to identify and remove the source of the toxicity. Routinely scheduled acute toxicity test batteries required in this permit section shall be suspended for the duration of the TRE. Following successful completion of the TRE the Permittee shall conduct one year of quarterly testing, with the results of the first quarterly test due the first full calendar quarter following TRE completion (For example, if the TRE is completed on April 28, the first quarterly results are due by September 30.) S. WET ,Data and Test Acceptability Criteria (TAC) Submittal 5.1 All WET test data and TAC must be submitted to the MPCA by the dates required by this section of the permit using the Minnesota Pollution Control Agency Acute Toxicity Test Report and associated instruction form. Data not submitted on the correct form, or submitted incomplete, will be returned to the permittee and deemed incomplete until adequately submitted on the designated form (identified above). Data should be submitted to: . MPCA Attn: WQ Submittals Center 520 Lafayette Road North St. Paul, Minnesota 55155-4194 6. Permit Re -opening for WET 6.1 Based on the results of the testing, the permit may be modified to include additional toxicity testing and a whole effluent toxicity limit. 7. Whole Effluent Toxicity Requirement Definitions 7.1 "Test" refers to an individual species. 7.2 "Test Battery" consists of WET testing of all test species for the specified test. For acute WET testing, all test species includes Fathead minnows, daphnia magna, and ceriodaphnia dubia. 7.3 "Acute Whole Effluent Toxicity (WET) Toxicity Test" is a static renewal test conducted on an exponentially diluted series of effluent. The purpose is to calculate the proportion of effluent that causes 50 percent mortality/immobility of aquatic organisms at 48 daphnia magna and ceriodaphnia duubia or 96 hours for fathead minnows. An LC501EC50 (lethal/immobile concentration) less than or equal to 100 percent effluent constitutes a positive for toxicity: