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Home My Public Portal AboutExhibit MSD 84L6 - Missouri River Wastewater Treatment FacilityExhibit MSD 84L6 STATE OF MISSOURI DEPARTMENT OF NATURAL RESOURCES MISSOURI CLEAN WATER COMMISSION MISSOURI STATE OPERATING PERMIT In compliance with the Missouri Clean Water Law, (Chapter 644 R.S. Mo. as amended, hereinafter, the Law), and the Federal Water Pollution Control Act (Public Law 92-500, 92nd Congress) as amended, Permit No. MO-0004391 Owner: Metropolitan St. Louis Sewer District (MSD), Missouri River WWTF Address: 3455 Creve Coeur Mill Road, St. Louis, MO 63146 Continuing Authority: Same as above Address: Same as above Facility Name: MSD, Missouri River WWTF ;Address: 3455 Creve Coeur Mill Road, St. Louis, MO 63146 Legal Description: Land Grant #03094, St. Louis County Receiving Stream: See page two First Classified Stream and ID: See page two USGS Basin & Sub -watershed No.: See page two is authorized to discharge from the facility described herein, in accordance with the effluent limitations and monitoring requirements as set forth herein: FACILITY DESCRIPTION Outfalls # 006. & 007 — POTW - SIC #4952- Certified "A" Operator Required See page 2. This permit authorizes only wastewater discharges under the Missouri Clean Water Law and the National Pollutant Discharge Elimination System; it does not apply to other regulated areas. This peit may be appealed in accordance with Section 644.051.6 of the Law. January 20, 2012 Effective Date January 19. 2017 E.xpiratinn Date Q-A' Sara Parker Pauley, Director, Department of Nat Resources PaA41/4 .I0)1 s, DiwetoY, Water d'rotect ni Program Page 2 of 12 Permit No. MO-0004391 FACILITY DESCRIPTION (continued) Outfall #003 — (Discharge eliminated) Emergency overflow basin. Outfall #005 - Emergency overflow from the influent structure. Emergency diversion from the influent structure. Discharge from this outfall shall be considered an unauthorized bypass pursuant to 40 CFR 122.41(m) and shall be reported, pursuant to 40 CFR 122.41(m) (3). Legal Description: Land Grant #03094, St. Louis County UTM Coordinates: X= 717889.. Y= 4291843 Receiving Stream: Creve Coeur Creek (P) (01702) First Classified Stream & ID: Creve Coeur Creek (P) (01702) USGS Basin and Subwatershed: (10300200-0703) Outfall #006 — Storm water Storm water runoff. Water quality compliance is achieved through Best Management Practices (BMPs) as described the Storm Water Pollution Prevention Plan (SWPPP) Legal Description: Land Grant #03094, St. Louis County UTM Coordinates: X= 718143 Y= 4290901 Receiving Stream: Missouri River (P) (01604) First Classified Stream & ID: Missouri River (P) (01604) USGS Basin and Subwatershed: (10300200-0703) Outfall #007 - POTW-SIC#4952 The facility has primary and secondary treatment consisting of four (4) primary clarifiers with odor control, a trickling filter pump station, a wet -weather peak storage basin for flows over 80 MGD, four (4) trickling filters, three (3) primary anaerobic and one (1) secondary anaerobic digester. Sludge dewatering consists of two belt filter presses and a two -bay sludge cake trailer loading system. Sludge disposal is via hauling for land application, composting, incinerating or landfilling. Design population equivalent is 280,000. Design flow is 28 million gallons per day (MGD). Actual flow is 28.7 million gallons per day. Design sludge production is 7,840 dry tons'year. Actual sludge production is 3,046 dry tons.year. Legal Description: Land Grant *03094, St. Louis County UTM Coordinates: X= 717587 Y= 4291619 Receiving Stream: Missouri River (P) (01604) First Classified Stream & ID: Missouri River (P) (01604) USGS Basin and Subwatershed: (10300200-0704) A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS _ PAGE NUMBER 3 of 12 PERMIT NUMBER MO-0004391 The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and remain in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below: OUTFALL NUMBER AND EFFLUENT PARAMETER(S) 1 UNITS FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS DAILY MAXIMUM WEEKLY AVERAGE MONTHLY AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE Outfall #006 —Storm water MGD Inches/day mglL SU mg/L mL/L/hr * * * * * * * * * * * once/quarter***** instantaneous estimate once/quarter***** total once/quarter***** grab once/quarter***** grab once/quarter***** grab once/quarter***** grab Flow Precipitation Biochemical Oxygen Demands pH —Units Oil & Grease Settleable solids MONITORING REPORTS SHALL BE SUBMITTED OUARTERLY; THE FIRST REPORT IS DUE April 28.2012. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER. THAN TRACE AMOUNTS. The permittee is authorized to discharge from outfall(s) with serial number(s) as limitations shall become effective upon issuance and remain in effect until December monitored by the permittee as specified below: specified in the application for this permit. The interim effluent 31, 2013. Such dicrharges shall be controlled, limited and OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS INTERIM EFFLUENT LIMITATIONS MONITORING REQUIREMENTS DAILY MAIM WEEKLY AVERAGE MONTHLY AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE Outfall #007 — Main Outfall MGD mg/L mg/L SU mg/L mg/L #/100 ml * * * * 15 * 60 65 * ' * 40 45 * ** 10 * * once/day 24 hr. total once/weekday** 24 hr. comp. once/weekday** 24 hr. comp. once/weekday** grab once/month grab once/month grab once/week grab Flow Carbonaceous Biochemical Oxygen Demand**** Total Suspended Solids**** pH — Units Oil and Grease Ammonia Nitrogen as N Esherichia colifonn (E. coli) (Note 1) MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE March 28, 2012. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Cadmium, Total Recoverable Chromium III, Total Recoverable Chromium VI, Dissolved Lead, Total Recoverable Chemical Oxygen Demand Total Phosphorus as P Nitrite & Nitrate Total Nitrogen as N Hardness µg/L p.g/L µg/L µg/L mg/L mg/L mg/L mg/L mg/L * * * * * * * * * * * * * * * * * once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** grab once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY. THE FIRST REPORT IS DUE Apri128. 2012. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PAGE NUMBER 4 of 12 PERMIT NUMBER MO-0004391 The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The final effluent limitations shall become effective after December 31, 2013, and remain in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below: OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS DAILY MAX,iMT. M WEEKLY AVERAGE MONTHLY AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE Outfall #007 — Main Outfall MGD mg/L mg/L SU mg/L mgL #/100 ml * *** 15 * 60 65 1030 * 40 45 *** 10 * 206 once/day 24 hr. total once. weekday** 24 hr. comp. once'weekday** 24 hr. comp. once/weekday** grab once. month grab once/month grab once/week grab Flow Carbonaceous Biochemical Oxygen Demand* * * * Total Suspended Solids**** pH —Lints Oil and Grease Ammonia Nitrogen as N E. coli (Note 1) MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE Februarv28. 2014. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Cadmium, Total Recoverable Chromium III, Total Recoverable Chromium VI, Dissolved Lead, Total Recoverable Chemical Oxygen Demand Total Phosphorus as P Nitrite & Nitrate Total Nitrogen as Ni Hardness µg'L µg/L µglL pg;L mg/L mg/L mg/L mg/L mg/L * * * * * * * * * * * * * * * * * * once quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** grab once/quarter ***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. once/quarter***** 24 hr. comp. MONITORING REPORTS SHALL BE SUBMITTED OUARTERLY; THE FIRST REPORT IS DUE April 28, 2014. HERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PAGE NUMBER 5 of 12 PERMIT NUMBER MO-0004391 The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit The final effluent limitations shall become effective upon issuance and remain in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below: OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS MEASUREMENT SAMPLE FREQUENCY TYPE Outfall #007 % Survival See Special Condition #12 twice/year 24 hr. composite Whole Effluent Toxicity (WET) Test MONITORING REPORTS SHALL BE SUBMITTED SEMI-ANNUALLY (January and July); THE FIRST REPORT IS DUE July 28.2012. B. STANDARD CONDITIONS IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE STANDARD CONDITIONS DATED October 1, 1980 and August 15 1994. AND HEREBY INCORPORATED ATTACHED Parts I. D & III AS THOUGH FULLY SET FORTH HEREIN. A. EFFLUENT LIMITATIONS AND MONITORING REOUIREMENTS (continued) * Monitoring requirement only. ** Once each weekday means: Monday, Tuesday, Wednesday, Thursday, and Friday, except National Holidays. *** pH is measured in pH units and is not to be averaged. The pH is limited to the range of 6.5-9.0 pH units. * *** This facility is required to meet a removal efficiency of 65%. The 30-day average percent removal shall not be less than 65%. * * * * * Once per quarter — use table below for sample months. Sample discharge at least once for the months of: Report is due: January, February, March (1st Quarter) _ April, May, June (2nd Quarter) July, August, September (3rd Quarter) October, November, December (4th Quarter) April 28 July 28 October 28 January 28 Note 1- Final limitations and monitoring requirements for Escherichia coliform is applicable only during the recreational season from April 1 through October 31. The Monthly Average Limit for Escherichia coliform is expressed as a geometric mean. C. INFLUENT MONITORING REQUIREMENTS PAGE NUMBER 6 of 12 PERMIT NUMBER MO-0004391 The facility- is required to meet a removal efficiency of 65% or more. The monitoring requirements shall become effective upon issuance and remain in effect until expiration of the permit. To determine removal efficiencies, the influent wastewater shall be monitored by the permittee as specified below: SAMPLING LOCATION AND PARAMETER(S) LJ'ITS MONITORING REQUIREMENTS MEASUREMENT FREQUENCY SAMPLE TYPE Influent Carbonaceous Biochemical Oxygen Demands Total Suspended Solids mg/L mg/L once/week once/week MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE March 28, 2012. 24 hr composite 24 hr composite D. SPECIAL CONDITIONS 1. This permit may be reopened and modified, or alternatively revoked and reissued, to: (a) Comply with any applicable effluent standard or limitation issued or approved under Sections 301(b)(2)(C) and (D), 304(b)(2). and 307(a) (2) of the Clean Water Act; if the effluent standard or limitation so issued or approved: (1) contains different conditions or is otherwise more stringent than any effluent limitation in the permit; or (2) controls any pollutant not limited in the permit. (b) Incorporate new or modified effluent limitations or other conditions, if the result of a waste load allocation study, toxicity test or other information indicates changes are necessary to assure compliance with Missouri's Water Quality Standards. (c) Incorporate new or modified effluent limitations or other conditions if, as the result of a watershed analysis, a Total Maximum Daily Load (TMDL) limitation is developed for the recei\ing waters which are currently included in Missouri's list of waters of the state not fully achieving the state's water quality standards, also called the 303(d) list. The permit as modified or reissued under this paragraph shall also contain any other requirements of the Clean Water Act then applicable. 2. All outfalls must be clearly marked in the field. 3. Changes in Discharges of Toxic Substances. The permittee shall notify the Director as soon as it knows or has reason to believe: (a) That any activity has occurred or will occur which would result in the discharge of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of the following "notification levels:" (I) One hundred micrograms per liter (100 µg'L); (2) Two hundred micrograms per liter (200 j.tg L) for acrolein and acrylonitrile; five hundred micrograms per liter (500 ug. L) for 2,5 dinitrophenol and for 2-methyl-4, 6-dinitrophenol; and one milligram per liter (1 mg/L) for antimony; (3) Five (5) times the maximum concentration value reported for the pollutant in the permit application; (4) The level established in Part A of the permit by the Director. (b) That they have begun or expect to begin to use or manufacture as an intermediate or final product or byproduct any toxic pollutant, which was not reported in the permit application. 4. Report as no -discharge when a discharge does not occur during the report period. Page 7 of 12 Permit No. MO-0004391 5. Water Quality Standards (a) Discharges to waters of the state shall not cause a violation of water quality standards rule under 10 CSR 20-7.031, including both specific and general criteria. (b) General Criteria. The following general water quality criteria shall be applicable to all waters of the state at all times including mixing zones. No water contaminant, by itself or in combination with other substances, shall prevent the waters of the state from meeting the following conditions: (1) Waters shall be free from substances in sufficient amounts to cause the formation of putrescent, unsightly or harmful bottom deposits or prevent full maintenance of beneficial uses; (2) Waters shall be free from oil, scum and floating debris in sufficient amounts to be unsightly or prevent full maintenance of beneficial uses; (3) Waters shall be free from substances in sufficient amounts to cause unsightly color or turbidity, offensive odor or prevent full maintenance of beneficial uses; (4) Waters shall be free from substances or conditions in sufficient amounts to result in toxicity to human, animal or aquatic life; (5) There shall be no significant human health hazard from incidental contact with the water; (6) There shall be no acute toxicity to livestock or wildlife watering (7) Waters shall be free from physical, chemical or hydrologic changes that would impair the natural biological community; (8) Waters shall be free from used tires, car bodies, appliances, demolition debris, used vehicles or equipment and solid waste as defined in Missouri's Solid Waste Law, section 260.200, RSMo, except as the use of such materials is specifically permitted pursuant to section 260.200-260.247. 6. Permittee shall implement and enforce its approved pretreatment program in accordance with the requirements of 40 CFR Part 403. The approved pretreatment program is hereby incorporated by reference. Permittee shall submit to the Department on or before September 30 of each year a report briefly describing its pretreatment activities during the nrevinuc calendar year. At a minimum, the report shall include the following: (a) An updated list of the Permittee's Industrial Users, including their names and addresses, or a list of deletions and additions keyed to a previously submitted list. The Permittee shall provide a brief explanation of each deletion. This list shall identify which Industrial Users are subject to categorical pretreatment Standards and specify which Standards are applicable to each Industrial User. The Iist shall indicate which Industrial Users are subject to local standards that are more stringent than the categorical Pretreatment Standards. The Permittee shall also list the Industrial Users that are subject only to local Requirements; (b) A summary of the status of Industrial User compliance over the reporting period; (c) A summary of compliance and enforcement activities (including inspections) conducted by the Permittee during the reporting period; and (d) Any other relevant information requested by the Department. As required in 40 CFR 122.21 (jX4) the permittee shall, as part of its renewal application for this permit, submit to the department a written technical evaluation of the need to revise local limits under 40 CFR 403.5 (c)(1). 7. Permittee shall use the combined primary and secondary treatment capacities in a way that maximizes treatment. This approval does not relieve the permittee from meeting 65% removal for CBOD or TSS. In addition, the permittee should continue to implement and refine a program that minimizes the capacity, management, operation, and maintenance (CMOM) of the collection system to assure the system is operated in a way that minimizes peak flows during wet weather events. The permittee shall adhere to the federal Consent Decree No. 4:07-CV-1120(CEJ) which has been lodged with the court on August 4,2011. 8. The permittee shall comply with any applicable requirements listed in 10 CSR 20-9, unless the facility has received written notification that the Department has approved a modification to the requirements. The monitoring frequencies contained in this permit shall not be construed by the permittee as a modification of the monitoring frequencies listed in 10 CSR 20-9. If a modification of the monitoring frequencies Iisted in 10 CSR 20-9 is needed, the permittee shall submit a written request to the department for review and, if deemed necessary, approval. 9. The permittee shall continue to implement a program for maintenance and repair of the collection system. Page 8 of 12 Permit No. MO-0004391 D. SPECIAL CONDITIONS (continued) 10. The permittee shall develop and implement a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP must be kept on - site and should not be sent to DNR unless specifically requested. The permittee shall select, install, use, operate, and maintain the Best Management Practices prescribed in the SWPPP in accordance with the concepts and methods described in the following document: Storm Water Management For Industrial Activities. Developing Pollution Prevention Plans and Best Management Practices, (Document number EPA 832-R-92-006) published by the United States Environmental Protection Agency (USEPA) in September 1992. The SWPPP must include the following: (a) An assessment of all storm water discharges associated with the facility. This must include a list of potential contaminants and an annual estimate of amounts that will be used in the described activities. (b) A listing of specific Best Management Practices (BNIPs) and a narrative explaining how BMPs will be implemented to control and minimize the amount of potential contaminants that may enter storm water. (c) The SWPPP must include a schedule for a bi-monthly site inspection and a brief written report. The inspections must include observation and evaluation of BMP effectiveness, deficiencies, and corrective measures that will be taken. Deficiencies must be corrected within seven days. Inspection reports must be kept on site with the SWPPP. These must be made available to DNR personnel upon request. (d) A provision for designating an individual to be responsible for environmental matters. (e) A provision for providing training to all personnel involved in material handling and storage, and housekeeping of maintenance and cleaning areas. Proof of training shall be submitted on request of DNR. 11. Sewer Extension Authority (a) The Department has approved the Sewer Extension Program for MSD to regulate and approve construction of sanitary sewers that are tributary to this wastewater treatment plant. (b) The approval of the Sewer Extension Program may be modified or revoked by the Department if the sewage collection, transportation, and receiving treatment facility reach their respective design capacity, or if the Department determines that this program is causing or contributing to chronic non-compliance of the receiving treatment facility, or if the permittee fails to follow the terms and conditions of the submitted and approved program. (c) The Sewer Extension Program Special Condition may be reopened and modified and reissued, or alternatively revoked to incorporate new or modified conditions to the sewer construction permit authority, if information or regulation or statute indicates changes are necessary to assure compliance with Missouri's Clean Water Law and associated regulations. (d) If item b or item c of the Sewer Extension Program occurs, the permittee will be notified to any modification to this operating permit. (e) The Permittee, as part of their Sewer Extension Program, shall submit an annual report January 28± of each year, to the Missouri Department of Natural Resources' St. Louis Regional Office. The report must provide the following: 1) list of the name of the projects approved, and 2) the length of sewers and force mains and the capacity of lift stations constructed under the sewer extension program. A summary of total flow at the treatment facility shall be included. Detailed project information and data including design flows and inspection records shall be available for review upon request. (f) The Sewer Extension Authority is valid the length of this operating permit. Upon renewal of the permit, the Sewer Extension Authority for MSD- St. Louis will be reevaluated. Page 9 of 12 Permit No. MO-0004391 D. SPECIAL CONDITIONS (continued) 12. Whole Effluent Toxicity (WET) Test shall be conducted as follows: SUMMARY OF ACUTE WET TESTING FOR THIS PERMIT OUTFALL AEC FREQUENCY SAMPLE TYPE MONTH 007 10 % Twice/year Multiple Any (within each semi-annual reporting period) Dilution Series 40% 20% 10% 5% 2.5% (Control) 100% upstream, if available (Control) 100% Lab Water, also called synthetic water (a) Test Schedule and Follow -Up Requirements (1) Perform a MULTIPLE -dilution acute WET test in the months and at the frequency specified above. For tests which are successfully passed, submit test results using the Department's WET test report form #MO-780-1899 along with complete copies of the test reports as received from the laboratory, including copies of chain -of - custody forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, F.Q. Box 176, Jefferson City, MO 65102. If the effluent passes the test, do not repeat the test until the next test period. (a) For discharges of stormwater, samples shall be collected within three hours from when discharge first occurs. (b) Samples submitted for analysis of stormwater discharges shall be collected as a grab. (c) For discharges of non-stormwater, samples shall be collected only when precipitation has not occurred for a period of forty-eight hours prior to sample collection. In no event shall sample collection occur simultaneously with the occur ence of precipitation excepting for stormwater samples. (d) A twenty-four hour composite sample shall be submitted for analysis of non-stormwater discharges. (e) Upstream receiving water samples, where required, shall be collected upstream from any influence of the effluent where downstream flow is clearly evident. (f) Samples submitted for analysis of upstream receiving water may be collected as either a grab or twenty- four -hour composite as appropriate to the nature of the discharge. (g) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon being received by the laboratory, prior to any manipulation of the effluent sample beyond preservation methods consistent with federal guidelines for WET testing that are required to stabilize the sample during shipping. (h) Any and all chemical or physical analysis of the effluent sample performed in conjunction with the WET test shall be performed at the 100% Effluent concentration in addition to analyses performed upon any other effluent concentration. (i) All chemical analyses included in the Missouri Department of Natural Resources WET test report form #MO-780-1899 shall be performed and results shall be recorded in the appropriate field of the report form. (j) Where flow -weighted composite sample is required for analysis, the samples shall be composited at the laboratory where the test is to be performed. (k) Where in stream testing is required downstream from the discharge, sample collection shall occur immediately below the established Zone of initial Dilution in conjunction with or immediately following a release or discharge. (1) Samples submitted for analysis of downstream receiving water may be collected as either a grab or twenty -four-hour composite as appropriate to the nature of the discharge. (m) All instream samples, including downstream samples, shall be tested for toxicity at the 100% concentration in addition to any other assigned AEC for in -stream samples. (2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability of the results. (3) If the effluent fails the test, a multiple dilution test shall be performed for BOTH test species within 30 calendar days and biweekly thereafter (for storm water, tests shall be performed on the next and subsequent storm water discharges as they occur, but not less than 7 days apart) until one of the following conditions are met: (a) THREE CONSECUTIVE MULTIPLE -DILUTION TESTS PASS. No further tests need to be performed until next regularly scheduled test period. (b) A TOTAL OF THREE MULTIPLE -DILUTION TESTS FAIL. Page 10 of 12 Permit No. MO-0004391 D. SPECIAL CONDITIONS (continued) 12. Whole Effluent Toxicity (WET) Test shall be conducted as follows: (continued) (4) The permittee shall submit a summary of all test results for the test series along with complete copies of the test reports as received from the laboratory to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the third failed test. (5) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A toxicity identification evaluation (TIE) or toxicity reduction evaluation (TRE) is automatically triggered. The permittee shall contact THE WATER PROTECTION PROGRAM within 14 calendar days from availability of the test results to ascertain as to whether a TIE or TRE is appropriate. The permittee shall submit a plan for conducting a TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date of DNB's direction to perform either a TIE or TRE. This plan must be approved by DNR before the TIE or TRE is begun. A schedule for completing the TIE or TRE shall be established in the plan approval. (6) Upon UNRs approval, the TIE •THE schedule may be modified if toxicity is intermittent during the TIE/TRE investigations. A revised \VET test schedule may be established by DNR for this period. (7) If a previously completed TIE has clearly identified the cause of toxicity, additional TIES will not be required as long as effluent characteristics remain essentially unchanged and the permittee is proceeding according to a DNR approved schedule to complete a TRE and reduce toxicity. Regularly scheduled WET testing as required in the permit, without the follow-up requirements, will be required during this period. (9) Submit a concise summary in tabular format of all WET test results with the annual report. (b) PASS/FAIL procedure and effluent limitations: (1) To pass a multiple -dilution test: (a) For facilities with a computed percent effluent at the edge of the zone of initial dilution, Allowable Effluent Concentration (AEC) OF 30% OR LESS. the AEC must be less than three -tenths (0.3) of the LCK concentration for the most sensitive of the test organisms; OR, (b) For facilities with an AEC greater than 30%, the LC50 concentration must be greater than 100%; AND, (c) All effluent concentrations equal to or less than the AEC must be nontoxic. Mortality observed in all effluent concentrations equal to or less than the AEC shall not be significantly different (at the 95% confidence level; p = 0.05) than that observed in the upstream receiving -water control sample. Where upstream receiving water is not available mortality observed in the AEC test concentration shall not be significantly different (at the 95% confidence level; p = 0.05) than that observed in the laboratory control. The appropriate statistical tests of significance shall be consistent with the most current edition of METHODS FOR IEASLRING THE ACUTE TOXICITY OF EFFLUENTS AND RECEIVING WATERS TO FRESHWATER AND MARINE ORGANISMS or other federal guidelines as appropriate or required. Failure of one multiple -dilution test may be considered an effluent limit violation. (c) Test Conditions (1) Test Type: Acute Static non -renewal (2) All tests, including repeat tests for previous failures, shall include both test species listed below. (3) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent with the most current USEPA guidelines. All test animals shall be cultured as described in the most current edition of Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms. (4) Test period: 48 hours at the "Acceptable Effluent Concentration" (AEC) specified above. (5) Upstream receiving stream water shall be used as dilution water. If upstream water is unavailable or if mortality in the upstream water exceeds 10%, "reconstituted" water will be used as dilution water. Procedures for generating reconstituted water will be supplied by the MDNR upon request. (6) Multiple -dilution tests will be run with: (a) 100%, 50%, 25%, 12.5%, and 6.25% effluent, unless the AEC is less than 25% effluent, in which case dilutions will be 4 times the AEC, two times the AEC, AEC. 1 `2 AEC and 1/4 AEC; (b) 100% receiving -stream water (if available), collected upstream of the outfall at a point beyond any influence of the effluent; and (c) Reconstituted water. (7) If reconstituted -water control mortality for a test species exceeds 10%, the entire test will be rerun. (8) If upstream control mortality exceeds 10%, the entire test will be rerun using reconstituted water as the dilutant. Page 11 of 12 Permit No. MO-0004391 p. SPECIAL CONDITIONS (continued) SUMMARY OF TEST METHODOLOGY FOR ACUTE WHOLE -EFFLUENT TOXICITY TESTS Whole -effluent -toxicity test required in NPDES permits shall use the following test conditions when performing single or multiple dilution methods. Any future changes in methodology will be supplied to the permittee by the Missouri Department of Natural Resources (MDNR). Unless more stringent methods are specified by the DNR, the procedures shall be consistent with the most current edition of Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Test conditions for Ceriodaphnia dubia: Test duration: Temperature: Light Quality: Photoperiod: Size of test vessel: Volume of test solution: Age of test organisms: No. of animals/test vessel: No. of replicates/concentration: No. of organisms/concentration: Feeding regime: Aeration: Dilution water: Endpoint: Test acceptability criterion: Test conditions for Pimephales promelas: Test duration: Temperature: Light Quality: Photoperiod: Size of test vessel: Volume of test solution: Age of test organisms: No. of animals/test vessel: No. of replicates/concentration: No. of organisms/concentration: Feeding regime: Aeration: Dilution water: Endpoint: Test Acceptability criterion: 48 h 25 ± 1°C Temperatures shall not deviate by more than 3°C during the test. Ambient laboratory illumination 16 h light, 8 h dark 30 mL (minimum) 15 mL (minimum) <24 b old 5 4 20 (minimum) None (feed prior to test) None Upstream receiving water; if no upstream flow, synthetic water modified to reflect effluent hardness. Pass/Fail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p< 0.05) 90% or greater survival in controls 48 h 25 ± 1°C Temperatures shall not deviate by more than 3°C during the test. Ambient laboratory illumination 16 h light/ 8 h dark 250 mL (minimum) 200 mL (minimum) 1-14 days (all same age) 10 4 (minimum) single dilution method 2 (minimum) multiple dilution method 40 (minimum) single dilution method 20 (minimum) multiple dilution method None (feed prior to test) None, unless DO concentration falls below 4.0 mg/L; rate should not exceed 100 bubbles/min. Upstream receiving water; if no upstream flow, synthetic water modified to reflect effluent hardness. Pass/Fail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p< 0.05) 90% or greater survival in controls Page 12 of 12 Permit No. MO-0004391 E. SCHEDULE OF COMPLIANCE (For disinfection) 1. The permittee must attain compliance with the final effluent limits for E. con as soon as possinie, but no later than December 31, 2013. 2. Within one year of issuance of this permit, the permittee shall report progress made in attaining compliance with the final effluent limits for E. coli. 3. Within two years of issuance of this permit, the permittee shall submit a report detailing progress made in attaining compliance with the final effluent limits for E. coli. 4. if the permittee fails to meet any of the interim dates above, the permittee shall notify the Department in writing of the reason for non-compliance no later than 14 days following each interim date. 5. Upon completion of construction, the permittee shall submit a Statement of Work Complete signed by the owner and a Professional Engineer that is registered in the state of Missouri. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 1 Missouri Department of Natural Resources FACT SHEET FOR THE PURPOSE OF RENEWAL OF MO-0004391 METROPOLITAN ST. LOUIS SEWER DISTRICT (MSD), MISSOURI RIVER WWTF The Federal Water Pollution Control Act ("Clean Water Act" Section 402 Public Law 92-500 as amended) established the National Pollution Discharge Elimination System (NPDES) permit program. This program regulates the discharge of pollutants from point sources into the waters of the United States, and the release of storm water from certain point sources. All such discharges are unlawful without a permit (Section 301 of the "Clean Water Act"). After a permit is obtained, a discharge not in compliance with all permit terms and conditions is unlawful. Missouri State Operating Permits (MSOPs) are issued by the Director of the Missouri Department of Natural Resources (Department) under an approved program, operating in accordance with federal and state laws (Federal "Clean Water Act" and "Missouri Clean Water Law" Section 644 as amended). MSOPs are issued for a period of five (5) years unless otherwise specified. As per [40 CFR Part 124.8(a)] and [10 CSR 20-6.020(1)2.] a Factsheet shall be prepared to give pertinent information regarding the applicable regulations, rationale for the development of effluent limitations and conditions, and the public participation process for the Missouri State Operating Permit (operating permit) listed below. A Factsheet is not an enforceable part of an operating permit. This Factsheet is for a Major ®, Part I — Facility Information Facility Type: POTW Facility SIC Code(s): 4952 Facility Description: Flow arrives at the plant from three different lift stations. The plant consists of the headworks with course screens for the Bonfils influent line/ Six fine screens/ Four grit chambers/Pre-aeration basins and a wet -weather peak storage basin for flows over 80 MGD. The wet -weather storage basin does not discharge from Outfall #007, but stored wastewater is pumped back to the headworks and into the plant. Next, the facility has primary and secondary treatment consisting of four (4) primary clarifiers with odor control, a trickling filter pump station, four (4) trickling filters, six secondary (final) clarifiers, three (3) primary anaerobic and one (1) secondary anaerobic digesters. Sludge dewatering consists of two belt filter presses with a two bay sludge cake trailer loading system. Sludge disposal is accomplished via hauling for land application; composting; incineration or landfilling. The fine screens and grit chambers are designed to handle 190 MGD. After the grit process, flows above 80 MGD are diverted to wet weather storage basin (four (4) concrete -lined basins with a storage capacity of 30 million gallons and a grass -lined basin with an additional storage capacity). The 80 MGD peak flow receives primary treatment. The peak design flow for secondary treatment is 56 MGD with an average design flow of 28 MGD and with excess flow stored in the 6.7 million gallon equalization basin. Secondary treatment flows in excess of 56 MGD are diverted to the equalization basin; the facility is designed to use combined and secondary treatment capacities in a way that maximizes treatment. Operating the facility in this manner is consistent with the permit. Have any changes occurred at this facility or in the receiving water body that effects effluent limit derivation? - Yes; Limits were adjusted after reasonable potential analysis and to reflect changes in water quality standards and effluent regulations. Application Date: 06/21/10 Expiration Date: 12/29/10 Last Inspection: 09/15/11 In Compliance ®; Non -Compliance ❑ Legal Description: UTM Coordinates: Receiving Stream: First Classified Stream & ID: USGS Basin and Subwatershed: Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 2 OL1 FALL(S) TABLE: 1 OUTFALL DESIGN FLOW DESIGN DISTANCE TO TREATMENT LEVEL EFFLUENT TYPE(CFi CLASSIFIED SEGMENT (III) 005 - - Emergency 1 - 006 variable Stormwater Stormwater runoff 0.0 007 43.4 Secondary Industrial, Domestic 0.0 Outfall #005 - Emergency overflow from the influent structure Land Grant =03094, St. Louis County X= 717889 ' Y= 4291843 Creve Coeur Creek (P) (01702) Creve Coeur Creek (P) (01702) (10300200-0703) Outfall #006 Storm water runoff. Legal Description: Land Grant #03094, St. Louis County UTM Coordinates: X= 718143 Y= 4290901 Receiving Stream: 'Missouri River (P) (01604) First Classified Stream & ID: Missouri River (P) (01604) USGS Basin and Subwatershed: (10300200-0703) Note: UTM coordinates are in Creve Coeur Creek watershed. Stormwater is conveyed to Missouri River. Outfall 0007-POTW-SIC#4952 Legal Description: Land Grant =03094, St. Louis County UTM Coordinates:: X= 717587 / Y= 4291619 Receiving Stream: Missouri River (P) (01604) First Classified Stream & ID: Missouri River (P) (01604) USGS Basin and Subwatershed: (10300200-0704) Receiving Water Body's Water Quality & Facility Performance History: No stream surveys have been conducted but a basin inventory was conducted for the Missouri River indicating habitat loss and channelization. Missouri River is listed on the 2002 Missouri 303(d) List for chlordane'PCBs in fish tissue. Missouri River is listed on the 2008 Missouri 303(d) List for Bacteria. The facility is not responsible for the impairments. Total toxic organics testing was noted to be in compliance and thus was removed from the permit. If future Form B2, Part D Expanded Effluent Test Data indicates a need for this testing, the permit writer may request that total toxic organics testing be applied in a future renewal. During the last permit cycle, the facility had one discharge sampling event from 3,16-122108 from Outfall #005 —Emergency Outfall. This one discharge event had a TSS exceedences. Outfall #006 had exceedences for settleable solids as follows: 1) twice in 2005 and 2006, 2) four times in 2008. For Outfall 007, according to MSD, permit limit exceedences were as follows: 1) Oil and Grease — once in 2006. The following were reported exceedences in 1 IDNR's Water Quality Information System but could not be confirmed by MSD: 1) TSS--once in 2005; 4) CBOD5—once in 2005. Lead and chromium have monitoring only requirements. This review cannot correct the discrepancies in the database. Comments: Facility has upgraded the headworks since the last renewal. Wet weather peak flow storage is also new in this renewal. The facility is not a combined sewer overflow (CSO) facility but a subject to sanitary sewer overflows (SSO), hence the need for the wet weather peak flow storage for flows over 80 SN1GD. Modification to the secondary treatment and design flow are forthcoming. The proposed expansion will include replacement of the existing trickling filter treatment process with an activated sludge process, which will provide for a higher level of treatment than currently exists. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 3 Part II — Operator Certification Requirements As per [10 CSR 20-6.010(8) Terms and Conditions of a Permit], permittees shall operate and maintain facilities to comply with the Missouri Clean Water Law and applicable permit conditions and regulations. Operators or supervisors of operations at regulated wastewater treatment facilities shall be certified in accordance with [10 CSR 20-9.020(2)] and any other applicable state law or regulation. As per [10 CSR 20-9.010(2)(A)], requirements for operation by certified personnel shall apply to all wastewater treatment systems, if applicable, as listed below: Check boxes below that are applicable to the facility; • Owned or operated by or for: • Municipalities • Public Sewer District 1/ Each of the above entities are only applicable if they have a Population Equivalent greater than two hundred (200) and/or fifty (50) or more service connections. • Department required: El The Department requires this facility to retain the services of a certified operator due to: Score of 97 in Appendix A. This facility currently requires an operator with an A Certification Level. Please see Appendix A - Classification Worksheet_ Modifications made to the wastewater treatment facility may cause the classification to be modified. Operator's Name: Ken Gambaro Certification Number: 3809 Certification Level: A Part III — Receiving Stream Information APPLICABLE DESIGNATIONS OF WATERS OF THE STATE: As per Missouri's Effluent Regulations [10 CSR 20-7.015], the waters of the state are divided into the below listed seven (7) categories. Each category lists effluent limitations for specific parameters, which are presented in each outfall's Effluent Limitation Table and further discussed in the Derivation & Discussion of Limits (see Appendix B) section. Missouri or Mississippi River [10 CSR 20-7.015(2)]: 10 CSR 20-7.031 Missouri Water Quality Standards, the department defines the Clean Water Commission water quality objectives in terms of "water uses to be maintained and the criteria to protect those uses." The receiving stream and/or 1 • classified receiving stream's beneficial water uses to be maintained are located in the Receiving Stream Table located below in accordance with [10 CSR 20-7.031(3)]. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 4 RECEIVING STREAM(S) TABLE: WATERBODY NAME CLASS WBJD i DESIGNATEDUSES* 8-DIGIT HUC EDU* * Greve Coeur P 01702 LWW, AQL, Z BC(B) *** Missouri River P 01604 LWW, AQL, WBC(B), 10300200 SCR, DWS, INND Ozark/Moreau/Loutre * - Irrigation (IRR), Livestock & Wildlife Watering (LWW), Protection of Warm Water Aquatic Life and Human Health -Fish Consumption (AQL), Cool Water Fishery(CLF), Cold Rater Fishery (CDF), Whole Bod.• Contact Recreation ([iBC), Secondary Contact Recreation (SCR), Drinking Water Supp:y (DWS), Industrial (LND), Groundwater (GRW). ** - Ecological Drainage Unit *** - UAA conducted on October 2006—no action taken to date. RECEIVING STRE.AM(S) Low-FLow VALUES TABLE: RECEIVING STREAM (U, C, P) 1Q10 LOW -FLOW VALUES (CFS) 7Q10 30Q10 Missouri River (P) 16,520 18,593 24,375 MIXING CONSIDERATIONS TABLE: MIXING ZONE (CFS) [10 CSR 20-7.031(4)(A)...] ZONE OF LNETLAL DILUTION (CFS) [10 CSR 20-7.031(4)(A)...] 7Q10 30Q10 1Q10 7QI0 4648.3 6093.8 413.0 434.0* Mixing Zone (MZ): One -quarter (14) of the stream volume of flow; length one -quarter (1/4) mile. [10 CSR 20- 7.031(4)(A)4.B.(III)(a)]. Zone of Initial Dilution (ZID): One -tenth (0.1) of the mixing zone volume of flow, not to exceed 10 times the effluent design flow. [10 CSR 20-7.031(4)(A)4.B.(IIl)(b)]. * Used ten times the designedflow. RECEIVING STREAM MONITORING REQLZRE' ENTS: No receiving water monitoring requirements recommended at this time. Part IV — Rationale and Derivation of Effluent Limitations & Permit Conditions ALTERNATIVE EVALUATIONS FOR NEw' FACILITIES: As per [10 CSR 20-7.015(4)(A)], discharges to losing streams shall be permitted only after other alternatives including land application, discharges to a gaining stream and connection to a regional wastewater treatment facility have been evaluated and determined to be unacceptable for environmental and economic reasons. Not Applicable Z; The facility does not discharge to a Losing Stream as defined by [10 CSR 20-2.010(36)] & [10 CSR 20-7.031(1)(N)], or is an existing facility. ANTI -BACKSLIDING: A provision in the Federal Regulations [CWA §303(d)(4); CWA §402(c); 40 CFR Part 122.44(I)] that requires a reissued permit to be as stringent as the previous permit with some exceptions. Z - Limitations in this operating permit for the reissuance of this permit conform to the anti -backsliding provisions of Section 402(o) of the Clean Water Act, and 40 CFR Part 122.44. ANTWEGR#DATION: In accordance with Missouri's Water Quality Standard [10 CSR 20-7.031(2)], the Department is to document by means of Antidegradation Review that the use of a water body's available assimilative capacity is justified. Degradation is justified by documenting the socio-economic importance of a discharging activity after determining the necessity of the discharge. ® - Renewal no degradation proposed and no further review necessary. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 5 AREA -WIDE WASTE TREATMENT MANAGEMENT & CONTINUING AUTHORITY: As per [10 CSR 20-6.010(3)(B)], ...An applicant may utilize a lower preference continuing authority by submitting, as part of the application, a statement waiving preferential status from each existing higher preference authority, providing the waiver does not conflict with any area -wide management plan approved under section 208 of the Federal Clean Water Act or any other regional sewage service and treatment plan approved for higher preference authority by the Department. BIOSOLIDS, SLUDGE, & SEWAGE SLUDGE: Bio-solids are solid materials resulting from wastewater treatment that meet federal and state criteria for beneficial uses (i.e. fertilizer). Sludge is any solid, semi -solid, or liquid waste generated from a municipal, commercial, or industrial wastewater treatment plant, water supply treatment plant, or air pollution control facility or any other such waste having similar characteristics and effect. Sewage sludge is solids, semi -solids, or liquid residue generated during the treatment of domestic sewage in a treatment works; including but not limited to, domestic septage; scum or solids removed in primary, secondary, or advanced wastewater treatment process; and a material derived from sewage sludge. Sewage sludge does not include ash generated during the firing of sewage sludge in a sewage sludge incinerator or grit and screening generated during preliminary treatment of domestic sewage in a treatment works. Additional information regarding biosolids and sludge is located at the following web address: http://dnr.mo.Rov/env/wnnloub/index.html, items WQ422 through WQ449. - Sludge/biosolids are removed by hauling and landfilled. COMPLIANCE AND ENFORCEMENT: Enforcement is the action taken by the Water Protection Program (WPP) to bring an entity into compliance with the Missouri Clean Water Law, its implementing regulations, and/or any terms and conditions of an operating permit. The primary purpose of the enforcement activity in the WPP is to resolve violations and return the entity to compliance. Not Applicable ®; The permittee/facility is not currently under Water Protection Program enforcement action. PRETREATMENT PROGRAM: The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in wastewater prior to or in lieu of discharging or otherwise introducing such pollutants into a Publicly Owned Treatment Works [40 CFR Part 403.3(q)]. Pretreatment programs are required at any POTW (or combination of POTW operated by the same authority) and/or municipality with a total design flow greater than 5.0 MGD and receiving industrial wastes that interfere with or pass through the treatment works or are otherwise subject to the pretreatment standards. Pretreatment programs can also be required at POTWs/municipals with a design flow less than 5.0 MGD if needed to prevent interference with operations or pass through. Several special conditions pertaining to the permittee's pretreatment program may be included in the permit, and are as follows: ▪ Implementation and enforcement of the program, • Annual pretreatment report submittal, • Submittal of list of industrial users, • Technical evaluation of need to establish local limitations, and • Submittal of the results of the evaluation Applicable ®; This permittee has an approved pretreatment program in accordance with the requirements of [40 CSR Part 403] and [10 CSR 20- 6.100] and is expected to implement and enforce its approved program. REASONABLE POTENTIAL ANALYSIS (RPA): Federal regulation [40 CFR Part 122.44(d)(1)(i)] requires effluent limitations for all pollutants that are or may be discharged at a level that will cause or have the reasonable potential to cause or contribute to an in -stream excursion above narrative or numeric water quality standard. In accordance with [40 CFR Part 122.44(d)(iii)] if the permit writer determines that any give pollutant has the reasonable potential to cause, or contribute to an in -stream excursion above the WQS, the permit must contain effluent limits for that pollutant. Applicable ®; A RPA was conducted on appropriate parameters. Please see APPENDIX B — RPA RESULTS. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 6 REMOVAL EFFICIENCY: Removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to Biochemical Oxygen Demand 5-day (BOD5) and Total Suspended Solids (TSS) for Publicly Owned Treatment Works (POTWs)/municipals. Please see the United States Environmental Protection Agency's (EPA) website for interpretation of percent removal requirements for National Pollutant Discharge Elimination System Permit Application Requirements for Publicly Owned Treatment Works and Other Treatment Works Treating Domestic Sewage @ www.epa.gov/fedrgstr/EPA- WATER/1999/August/Day-04/w18866.htm Applicable ®; Equivalent to Secondary Treatment is 65% removal [40 CFR Part 133.105(a)(3) & (b)(3)]. SANITARY SEWER OVERFLOWS (SSO) AND INFLOW AND INFILTRATION Sanitary Sewer Overflows (SSOs) are defined as an untreated or partially treated sewage release are considered bypassing under state regulation [10 CSR 20-2.010(11)] and should not be confused with the federal definition of bypass. SSOs have a variety of causes including blockages, line breaks, and sewer defects that allow excess storm water and ground water to (1) enter and overload the collection system, and (2) overload the treatment facility. Additionally, SSO's can be also be caused by lapses in sewer system operation and maintenance, inadequate sewer design and construction, power failures, and vandalism. SSOs also include overflows out of manholes and onto city streets, sidewalks, and other terrestrial locations. Additionally, Missouri RSMo §644.026.1 mandates that the Department require proper maintenance and operation of treatment facilities and sewer systems and proper disposal of residual waste from all such facilities. - In accordance with Missouri RSMo §644.026.1.(15) and 40 CFR Part 122.41(e), the permittee is required to develop and/or implement a program for maintenance and repair of the collection system and shall be required in this operating permit by either means of a Special Condition or Schedule of Compliance. In addition, the Department considers the development of this program as an implementation of this condition. Additionally, 40 CFR Part 403.3(o) defines a POTW to include any device and systems used in the storage, treatment, recycling and reclamation of municipal sewage or industrial wastes of liquid nature. It also includes sewers, pipes, and other conveyances only if they convey wastewater to a POTW Treatment Plant. At this time, the Department recommends the US EPA's Guide for Evaluating Capacity, Management, Operation and Maintenance (CMOM) Programs at Sanitary Sewer Collection Systems (Document # EPA 305-B-05-002). The CMOM identifies some of the criteria used by the EPA to evaluate a collection system's management, operation, and maintenance and was intended for use by the EPA, state, regulated community, andor third party entities. The CMOM is applicable to small, medium, and large systems; both public and privately owned; and both regional and satellite collection systems. The CMOM does not substitute for the Clean Water Act, the Missouri Clean Water Law, and both federal and state regulations, as it is not a regulation. SCHEDULE OF COMPLLANCE (SOC): A schedule of remedial measures included in a permit, including an enforceable sequence of interim requirements (actions, operations, or milestone events) leading to compliance with the Missouri Clean Water Law, its implementing regulations, and or the terms and conditions of an operating permit. Applicable ®; This permit contains a Schedule of Compliance for E. coli. The time given for effluent limitations of this permit listed under Interim Effluent Limitation and Final Effluent Limitations were established in accordance with [10 CSR 20-7.031(10)]. STORM WATER POLLUTION PREVENTION PLAN (SWPPP): In accordance with 40 CFR 122.44(k) Best Management Practices BMPs) to control or abate the discharge of pollutants when: (1) Authorized under section 304(e) of the Clean Water Act (CWA) for the control of toxic pollutants and hazardous substances from ancillary industrial activities: (2) Authorized under section 402(p) of the CWA for the control of storm water discharges; (3)Numeric effluent limitations are infeasible; or (4) the practices are reasonably necessary to achieve effluent limitations and standards or to carry out the purposes and intent of the CWA. In accordance with the EPA's Developing Your Stormwater Pollution Prevention Plan, A Guide for Industrial Operators, (Document number EPA 833-B-09-002) [published by the United States Environmental Protection Agency (CSEPA) in February 2009], BMPs are measures or practices used to reduce the amount of pollution entering (regarding this operating permit) waters of the state. BMPs may take the form of a process, activity, or physical structure. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 7 Additionally in accordance with the Storm Water Management, a SWPPP is a series of steps and activities to (1) identify sources of pollution or contamination, and (2) select and carry out actions which prevent or control the pollution of storm water discharges. Applicable ®; A SWPPP shall be developed and implemented for each site and shall incorporate required practices identified by the Department with jurisdiction, incorporate erosion control practices specific to site conditions, and provide for maintenance and adherence to the plan. VARIANCE: As per the Missouri Clean Water Law § 644.061.4, variances shall be granted for such period of time and under such terms and conditions as shall be specified by the commission in its order. The variance may be extended by affirmative action of the commission. In no event shall the variance be granted for a period of time greater than is reasonably necessary for complying with the Missouri Clean Water Law §§644.006 to 644.141 or any standard, rule or regulation promulgated pursuant to Missouri Clean Water Law §§644.006 to 644.141. Not Applicable ®; This operating permit is not drafted under premises of a petition for variance. WASTELOAD ALLOCATIONS (WLA) FOR LINIITS: As per [10 CSR 20-2.010(78)], the amount of pollutant each discharger is allowed by the Department to release into a given stream after the Department has determined total amount of pollutant that may be discharged into that stream without endangering its water quality. Applicable ®; Wasteload allocations were calculated where applicable using water quality criteria or water quality model results and the dilution equation below: C _ (Cs x Qs) + (Ce x Qe) (EPA/505/2-90-001, Section 4.5.5) (Qe + Qs) Where C = downstream concentration Cs = upstream concentration Qs = upstream flow Ce = effluent concentration Qe = effluent flow Chronic wasteload allocations were determined using applicable chronic water quality criteria (CCC: criteria continuous concentration) and stream volume of flow at the edge of the mixing zone (MZ). Acute wasteload allocations were determined using applicable water quality criteria (CMC: criteria maximum concentration) and stream volume of flow at the edge of the zone of initial dilution (ZID). Water quality based maximum daily and average monthly effluent limitations were calculated using methods and procedures outlined in USEPA's "Technical Support Document For Water Quality -based Toxics Control" (EPA/505/2-90-001). Number of Samples "n": Additionally, in accordance with the TSD for water quality -based permitting, effluent quality is determined by the underlying distribution of daily values, which is determined by the Long Term Average (LTA) associated with a particular Wasteload Allocation (WLA) and by the Coefficient of Variation (CV) of the effluent concentrations. Increasing or decreasing the monitoring frequency does not affect this underlying distribution or treatment performance, which should be, at a minimum, be targeted to comply with the values dictated by the WLA. Therefore, it is recommended that the actual planned frequency of monitoring normally be used to determine the value of "n" for calculating the AML. However, in situations where monitoring frequency is once per month or less, a higher value for "n" must be assumed for AML derivation purposes. Thus, the statistical procedure being employed using an assumed number of samples is "n = 4" at a minimum. For Total Ammonia as Nitrogen, "n = 30" is used. WLA MODELING: There are two general types of effluent limitations, technology -based effluent limits (TBELs) and water quality based effluent limits (WQBELs). If TBELs do not provide adequate protection for the receiving waters, then WQBEL must be used. Not Applicable ®; A WLA study was either not submitted or determined not applicable by Department staff. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 8 WATER QUALITY STANDARDS: Per [10 CSR 20-7.031(3)], General Criteria shall be applicable to all waters of the state at all times including mixing zones. Additionally, [40 CFR 122.44(d)(1)] directs the Department to establish in each NPDES permit to include conditions to achieve water quality established under Section 303 of the Clean Water Act, including State narrative criteria for water quality. WHOLE EFFLUENT TOXICITY" (WET) TEST: A WET test is a quantifiable method of determining if a discharge from a facility may be causing toxicity to aquatic life by itself, in combination with or through synergistic responses when mixed with receiving stream water. Applicable ►4; Under the federal Clean Water Act (CWA) §101(a)(3), requiring WET testing is reasonably appropriate for site -specific Missouri State Operating Permits for discharges to waters of the state issued under the National Pollutant Discharge Elimination System (NPDES). WET testing is also required by 40 CFR 122.44(d)(1). WET testing ensures that the provisions in the 10 CSR 20- 6.010(8)(A)7. and the Water Quality Standards 10 CSR 20-7.031(3)(D),(F),(G),(1)2.A & B are being met. Under [10 CSR 20- 6.010(8)(A)41, the Department may require other terms and conditions that it deems necessary to assure compliance with the Clean Water Act and related regulations of the Missouri Clean Water Commission. In addition the following MCWL apply: § § §644.051.3 requires the Department to set permit conditions that comply with the NICWL and CWA; 644 051.4 specifically references toxicity as an item we must consider in writing permits (along with water quality -based effluent limits, pretreatment, etc...); and 644.051.5 is the basic authority to require testing conditions. WET test will be required by all facilities meeting the following criteria: Facility is a designated Major. 303(d) LIST & TOTAL MAXIMUM DAILY LOAD (TMDL): Section 303(d) of the federal Clean Water Act requires that each state identify waters that are not meeting water quality standards and for which adequate water pollution controls have not been required. Water quality standards protect such beneficial uses of water as whole body contact (such as swimming), maintaining fish and other aquatic life, and providing drinking water for people, livestock and wildlife. The 303(d) list helps state and federal agencies keep track of waters that are impaired but not addressed by normal water pollution control programs. A TMDL is a calculation of the maximum amount of a given pollutant that a body of water can absorb before its water quality is affected. If a water body is determined to be impaired as listed on the 303(d) list, then a watershed management plan will be developed that shall include the TN. IDL calculation Applicable ®; Missouri River is listed on the 2002 Missouri 303(d) List for chlordane/PCBs in fish tissue. Missouri River is listed on the 2008 Missouri 303(d) List for Bacteria. ►� — This facility is not considered to be a source of the above listed pollutant(s) or considered to contribute to the impairment of Missouri River Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 9 Part V — Effluent Limits Determination Outfall #DOS — Emergency Outfall Emergency diversion from the influent structure. Discharge from this outfall shall be considered an unauthorized bypass pursuant to 40 CFR 122.41(m) and shall be reported, pursuant to 40 CFR 122.41(m) (3). Future permit action due to facility modification may contain new operating permit terms and conditions that supersede the terms and conditions, including effluent limitations, of this operating permit OuVall #006 — Storm water Outfall Effluent limitations derived and established in the below Effluent Limitations Table are based on current operations of the facility. Future permit action due to facility modification may contain new operating permit terms and conditions that supersede the terms and conditions, including effluent limitations, of this operating permit EFFLUENT LIMITATIONS TABLE: PARAMETER UNIT BASIS FOR LnvnTS DAILY MAXIMUM WEEKLY AVERAGE MONTHLY AVERAGE MODIFIED PREVIOUS PERMIT LIMITATIONS FLOW * 1 * * NO BOA (MG/L) 1 * * NO RAINFALL (INCHES) 1 * * NO PH (S.U.) 1 * * YES 6.0-9.0 OIL & GREASE (MG/L) 1,2 * * YES 15/10 SETTLEABLE Soups ML/LIHR. 9 * * YES 1.5/1.0 * - Monitoring requirement only. Basis for Limitations Codes: 1. State or Federal Regulation/Law 2. Water Quality Standard (includes RPA) 3. Water Quality Based Effluent Limits 4. Lagoon Policy 5. Ammonia Policy 6. Dissolved Oxygen Policy 7. Antidegradation Policy 8. Water Quality Model 9. Best Professional Judgment 10. TMDL or Permit in lieu of TMDL 11. WET Test Policy 12. Antidegradation Review OUTFALL #006 — DERIVATION AND DISCUSSION OF LIMITS: • Flow. In accordance with [40 CFR Part 122.44(i)(1)(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the Department, which may require the submittal of an operating permit modification. • Precipitation. (Rainfall) Monitoring requirement only, requirement retained from previous state operating permit. • Biochemical Oxvien Demand (BODS). Monitoring requirement only, requirement retained from previous state operating. The discharge monitoring data indicate that BMPs have been successfully implemented as per the SWPPP for the facility. Please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receivins Stream Information. • The discharge monitoring data indicate that BMPs have been successfully implemented as per the SWPPP for the facility; therefore, limitations are removed from previous state operating. [10 CSR 20-7.015(2)(A)2.], please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information. • Oil & Grease. The discharge monitoring data indicate that BMPs have been successfully implemented as per the SWPPP for the facility; therefore, limitations are removed from previous state operating. • Settleable Solids. Monitoring requirement only. The daily maximum of 1.5 mL/L/hr and the monthly average of 1.0 mL/L/hr are not retained from previous state operating. The permittee has developed a Storm Water Pollution Prevention Plan which includes Best Management Practices to control storm water discharges. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 10 Outfall #007— Main Facility Outfall Effluent limitations derived and established in the below Effluent Limitations Table are based on current operations of the facility. Future permit action due to facility modification may contain new operating permit terms and conditions that supersede the terms and conditions, including effluent limitations, of this operating permit. EFFLUENT LIMITATIONS TABLE FOR OUTFALL 007: BMI5 PARAMETER UNIT FOR LIMrrs DAILY \LaXLVPJM WEEKLY ; MONTHLY AVERAGE ; AVERAGE 'MODIFIED PREVIOUS PERMIT LIMTTATIONS FLOW * 1 * NO CBOD5** '; (MG/L) 1 60 40 NO TSS ** j (MG/L) 1 65 45 NO PH 3 (S.f:.) 1 6.5-9.0 , 6.5-9.0 YES 6.0-9.0 AMMONIA AS N (MAY 1— OCT 31) (MG/L) 2,3,5 * * NO ANL1iONLA AS N (Nov 1— APR 30) (MG/L) 2,3,5 * * No ESCHERICHLA COLLFORM (E. i COL 100 COLI) *** - ML 1,2,3 1030 206 NEW**** NITRATE & NITRITE (MG/L) * * NO CADMIUM, TOTAL RECOVERABLE (µG/L) 2.3 No CHROME,' III, TOTAL RECOVERABLE (uGiL) 2,3 * No CHROMIUM VI, DISSOLVED (i G: L) 2,3 * * No LEAD, TOTAL RECOVERABLE (G.. L) 2'3 I * x -No OIL & GREASE (MG L) 1,2 15.0 10.0 No TOTAL PHOSPHORUS (MG/L) ' 2,3 * * No TOTAL NITROGEN AS N (MG L) 2,3 * * No CHEMICAL OXYGEN DEMAND (COD) (uG L) 2,3 * 1 * NO HARDNESS 1 (Mc-L) 2,3 * * NO WHOLE EFFLUENT TOXICITY (WET) TEST % i 11 Survival ? Please see WET Test in the Derivation and Discussion Sectionbelow. MONITORING FREQUENCY Please see Afinimum Sampling and Reporting Frequency Requirements in the Derivation and Discussion Section below. - Monitoring requirement only. **, This facility is required to meet a removal efficiency of 65% or more for CARBONACEOUS BOD5 and TSS. Influent CARBONACEOUS BOD5 and TSS data should be reported to ensure removal efficiency requirements are met. Note: Monitoring requirements for all POCs, except total phosphorus, total N, COD and hardness, were applied to obtain data for future reasonable potential analysis. ** * - # of colonies;100mL; the Monthly Average for E. colt is a geometric mean. **** - Parameter not previously established in previous state operating permit. Basis for Limitations Codes: 1. State or Federal Regulation Law 2. Water Quality Standard (includes RPA) 3. Water Quality Based Effluent Limits 4. Lagoon Policy 5. Ammonia Policy 6. Dissolved Oxygen Policy 7. Antidegradation Policy 8. Water Quality Model 9. Best Professional Judgment 10, TMDL or Permit in lieu of TMDL 11 , WET Test Policy 12. Antidegradation Review Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 11 OUTFALL #007 — DERIVATION AND DISCUSSION OF LIMITS: • f$. In accordance with [40 CFR Part 122.44(iX1)(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the Department, which may require the submittal of an operating permit modification. • Carbonaceous Biochemical Oxygen Demand (BOD5). Effluent limitations from the previous state operating permit have been reassessed and verified that they are still protective of the receiving stream's Water Quality. Therefore, effluent limitations have been retained from previous state operating permit. APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information. • Total Suspended Solids (TSS). Effluent limitations from the previous state operating permit have been reassessed and verified that they are still protective of the receiving stream's Water Quality. Therefore, effluent limitations have been retained from previous state operating permit, please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information. pH. The limitation have been modified to 6.5-9.0 SU per [10 CSR 20-7.015(2)(A)2.], please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information. • Total Ammonia Nitrogen. Monitoring only. Results of the reasonable potential analysis indicate that there is no reasonable potential of exceed water quality standards criteria. To be consistent with the draft final expansion permit, monitoring only was applied. • Escherichia coli (E. coli Monthly average of 1,134 per 100 ml as a geometric mean during the recreational season (April 1 — October 31), to protect Secondary Contact Recreation designated use of the receiving stream, as per 10 CSR 20-7.031(4)(C). At present, the department has no practicable method to determine a single sample maximum bacteria concentration for secondary contact recreation per request of the Environmental Protection Agency. Therefore, the department has assigned monitoring for Weekly Average to determine effluent variability for development of future effluent limit. Because this facility does not currently disinfect, the permit will contain interim and final effluent limits for E. coll. An effluent limit for both monthly average and weekly average is required by 40 CFR 122.45(d). For POTWs if more than one (1) sample is collected in a calendar week, then the result is to be reported as a geometric mean. MSD will be installing an ultraviolet disinfection system during plant upgrades that are scheduled within the next few years. • Oil & Grease. Conventional pollutant, effluent limitation for protection of aquatic life; 10 mg/L monthly average, 15 mg/L daily maximum. • Nitrates & Nitrites. Monitoring only. Results of the reasonable potential analysis indicate that there is no reasonable potential of exceed water quality standards criteria. These parameters are included as an indication of performance of the facility and will be reviewed upon renewal of the permit. • Total Phosphorus and Total Nitrogen as N. Monitoring only. This parameter is included as an indication of performance of the facility and will be reviewed upon renewal of the permit. • Chemical Oxygen Demand (COD). Monitoring only. This parameter is included as an indication of performance of the facility and will be reviewed upon renewal of the permit. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 12 Metals Effluent limitations for total recoverable metals were developed using methods and procedures outlined in the "Technical Support Document For Water Quality -based Toxic Controls" (EPA/505/2-90-001) and "The Metals Translator: Guidance For Calculating A Total Recoverable Permit Limit From A Dissolved Criterion" (EPA 823-B-96-007). General warm -water fishery criteria apply and a water hardness of 200 mg/L is used in the conversion below. Due to the absence of contemporaneous effluent and instream data for total recoverable metals, dissolved metals, hardness, and total suspended solids with which to calculate metals translators, partitioning between the dissolved and absorbed phases was assumed to be minimal (Section 5.7.3. EPA 505/2-90-001). Freshwater criteria conversion factors for dissolved metals were used as the metals translator as recommended in guidance (Section 1.3, 1.5.3, and Table 1, EPA 823-B-96-007). If concurrent site -specific data for total recoverable metals, dissolved metals, hardness, and total suspended solids are provided to the Department, partitioning evaluations may be considered and site -specific translators developed. METAL CONVERSION FACTORS 1 ACUTE 1 CHRONIC Cadmium 0.915 0.88 Chromium III i 0.316 0.860 Chromium VI I 1.0 1.0 Lead 0.690 0.690 Conversion factors for Cd and Pb are hardness dependent. Values calculated using equation found in Section 1.3 of EPA 823-B- 96-007 and hardness = 200 mg/L. Cadmium. Total Recoverable. Monitoring only. Results of the reasonable potential analysis indicate that there is no reasonable potential of exceed water quality standards criteria. Chromium III. Total Recoverable. Monitoring only. Results of the reasonable potential analysis indicate that there is no reasonable potential of exceed water quality standards criteria. ▪ Chromium VI. Dissolved. Monitoring only. Results of the reasonable potential analysis indicate that there is no reasonable potential of exceed water quality standards criteria. • Lead. Total Recoverable. To be consistent with the draft final expansion permit, monitoring only was applied. Monitoring only with the following explanation. Lead is a Tier 1 pollutant in this segment of the Missouri River. The dissolved lead component of total lead was determined to be Tier 2 and the use of the 90" percentile dissolved lead concentration (0.308 ug/L) in the RPA (see Appendix B) did not exceed water quality standards for aquatic life criteria. In addition, the upstream total recoverable concentration of lead is 15.1 ugL; this value is the 90" percentile value, not the arithmetic mean. The arithmetic mean is 7.29 ugL. The upstream lead concentration is a major contributing factor to the exceedance of the drinking water standards at the end of the mixing zone. The upstream concentration is a calculated value; therefore it may not represent the actual concentration in the receiving stream. The exceedence of drinking water standard is within one standard deviation of the mean concentration. Therefore, NIDNR staff believes that monitoring only is sufficient. Protection of Aquatic Life Chronic and Acute Criteria (ug/L) are listed in Table 2 and Table 5. Monitoring frequency based upon compliance with state regulations at 10 CSR 20-7.015(2)(D) and 10 CSR 20-7.015(2)(D)4. • WET Test. WET Testing schedules and intervals are established in accordance with the Department's Permit Manual; Section 5.2 Effluent Limits ' WET Testing for Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow. ® Acute ® No less than TWICE/YEAR: ❑ Facility is subject to production processes alterations throughout the year. ® Facility handles large quantities of toxic substances, or substances that are toxic in large amounts. ❑ Facility has been granted seasonal relief of numeric limitations. Acute and or Chronic Allowable Effluent Concentrations (AECs) for facilities that discharge to unclassified, Class C, Class P (with default Mixing Considerations), or Lakes [10 CSR 20-7.031(4)(A)4.B.(IV)(b)] are 100%, 50%, 25%. 12.5%. & 6.25%. Acute AEC% = ((design flow«, + Z1D7Qlo) / design flowth)'`] x 100 = 10% The dilution series is 40%, 20%, 10%, 5%, 2.5%. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 13 ■ Minimum Sam )line and Renortins Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit. PART VI: Finding of Affordability Pursuant to Section 644.145, RSMo., the Department is required to determine whether a permit or decision is affordable and makes a finding of affordability for certain permitting and enforcement decisions. This requirement applies to discharges from combined or separate sanitary sewer systems or publically-owned treatment works. ® Applicable; The Department is required to determine findings of affordability because the permit applies to a combined or separate sanitary sewer system for a publically-owned treatment works. Finding of affordability - The department has made a reasonable search for empirical data indicating the permit is affordable. The search consisted of a review of department records that might contain economic data on the community, a review of information provided by the applicant as part of the application, and public comments received in response to public notices of this draft permit. If the empirical cost data was used by the permit writer, this data may consist of median household income, any other ongoing projects that the Department has knowledge, and other demographic financial information that the community provided as contemplated by Section 644. 145.3. The department is hereby making a finding based from the following facts: ❑ 1) The applicant states that the terms and conditions are affordable for the community. OR; This pennit action was taken at the discretion of the facility, therefore the department assumes the applicant already determined it is affordable; ❑ 2) The permit action is taken at the discretion of the system itself (e.g., sewer extension construction permits, or the relocation of an outfall in lieu of otherwise upgrading a system in order to comply with a permit issued prior to July 11, 2011); ❑ 3) This permit contains no new or expanded terms and conditions; ❑ 4) The department is not aware of any significant economic impacts this pennit would cause on distressed populations; ❑ 5) No comments indicating such impact were received during the public comment period on the draft permit; ❑ 6) The department is not aware of any other more cost effective wastewater treatment options that would achieve the required effluent quality; ❑ 7) The Facility Plan on the construction permit contained an affordability finding; ❑ 8) The applicant provided increased effluent discharge monitoring costs due to expanded monitoring frequency for certain permit parameters; ❑ 9) An affordability analysis was performed as part of the Long Tenn Control Plan on Combined Sewer Overflows; ❑ 10) An affordability analysis was performed as part of an Anti -degradation Review Determination; El 11) The applicant has entered into a Voluntary Compliance Agreement (VCA) for the purpose of eliminating inflow and infiltration into the plant. The applicant entered into the VCA after due consideration, therefore the department assumes that the applicant has determined it is affordable. ❑ 12) The applicant is negotiating an Amended Consent Judgment which addresses eliminating inflow and infiltrations into the plant, as well as future unauthorized discharges from the facility's peak flow clarifier. This Amended Consent Judgment will establish a schedule to address these issues taking in to consideration affordability. Final and interim effluent limitations have been established in this permit for various metals. Additional treatment to attain compliance with final limitations should not be necessary given the fact that the city has an approved pretreatment program to establish localized limitations on industrial dischargers of the facility. Because such metals limitations are not expected to cause any significant increases in the cost of operating the WWTP, the Department finds that the reissuance of this permit is affordable pursuant to Section 644.145 RSMo. ❑ 13) The applicant is negotiating an Amended Consent Judgment which addresses eliminating inflow and infiltrations into the plant, as well as future unauthorized discharges from the facility's peak flow clarifier. This Amended Consent Judgment will establish a schedule to address these issues taking in to consideration affordability. Final and interim limitations have bean established in this permit for E. coli. Additional treatment to attain compliance with final limitations should not be necessary given the fact that the facility has ozone disinfection as part of its treatment train. Because such E. coli limitations are not expected to cause any significant increases in the cost of operating the WWTP, the Department finds that the reissuance of this permit is affordable pursuant to Section 644.145 RSMo. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 14 ❑ 14) Others: explain. Section 644.145 of BB 89 as signed by the Governor on July 11, 2011, requires the Department to make a finding of affordability, with respect to the community and its residents, in connection with the issuance of certain permits under the Missouri Clean Water Law. The financial capability of the Metropolitan St. Louis Sewer District (MSD) was considered in the Combined Sewer Overflow Long - Term Control Plan Update Report, Revised February. 2011 (Plan). Although the Missouri River Wastewater Treatment Facility is not part of a combined sewer system, the financial capability analysis in the report included this facility's service area and the projected costs for known projects at the time. In addition, projects to improve the Missouri Wastewater Treatment Facility and the collection system will be required as part of the federal consent decree No. 4:07-CV-1120(CEJ), which was lodged on August 4, 2011. Part VII — Administrative Requirements On the basis of preliminary staff review and the application of applicable standards and regulations, the Department, as administrative agent for the Missouri Clean Water Commission, proposes to issue a permit(s) subject to certain effluent limitations, schedules, and special conditions contained herein and within the operating permit. The proposed determinations are tentative pending public comment. PUBLIC NOTICE: The Department shall give public notice that a draft permit has been prepared and its issuance is pending. Additionally, public notice will be issued if a public hearing is to be held because of a significant degree of interest in and water quality concerns related to a draft permit. No public notice is required when a request for a permit modification or termination is denied; however, the requester and permittee must be notified of the denial in writing. The Department must issue public notice of a pending operating permit or of a new or reissued statewide general permit. The public comment period is the length of time not less than 30 days following the date of the public notice which interested persons may submit written comments about the proposed permit. For persons wanting to submit comments regarding this proposed operating permit, then please refer to the Public Notice page located at the front of this draft operating permit. The Public Notice page gives direction on how and where to submit appropriate comments. (Individual permit writers may leave the below check boxes and discussion during the drafting of the Factsheet; however, once one of the boxes below is applicable, the permit writer will need to check the appropriate box and fill in the needed items. At that time the permit writer may or may not (SOP of each RO at this time) remove the unchecked boxes. Please remove this reminder. Z - The Public Notice period for this operating permit is tentatively schedule to begin on November 10, 2011 or is in process. DATE OF FACT SHEET: MARCH 25, 2011, REVISED DECEMBER 20, 2011 COMPLETED BY: TODD BLANC, ENVIRONMENTAL SPECLALIST IV WASTEWATER ENGENELRLNG ETNrl PERMITTING ANIP ENGINEERING SECTION WATER PROTECTION PROGRAM (573) 526-1139 TODD. BLANC@DNR.MO.GOV WALTER FETT, ENVIRONMENTAL ENGINEER II PER-MITTING AND ENGLNEERLNG SECTION WATER PROTECTION PROGRAM (573) 526-4589 WALTFR.FETTCDNR.MO.GOV Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 15 Part VIII — Appendices CLASSIFICATION WORKSHEET: — - ^ ITEMPonqss POSSIBLE Ponv s ASSIGNED Maximum Population Equivalent (P.E.) served (Max 10 pts.) 1 Pt /I0,000 PE or major fraction thereof. 10 Maximum: 10 pt Design Flow (avg. day) or peak month; use greater (Max 10 pts.) 1 pt. / MGD or major fraction thereof. 10 WATER SENSITIVITY EFFLUENT DISCHARGE RECEIVING Missouri or Mississippi River 0 0 All other stream discharges except to losing streams and stream reaches supporting whole body contact 1 Discharge to lake or reservoir outside of designated whole body contact recreational area 2 Discharge to losing stream, or stream, lake or reservoir area supporting whole body contact recreation 3 PRELIMINARY TREATMENT - Headworks Screening and/or comminution 3 3 Grit removal 3 3 Plant pumping of main flow (lift station at the headworks) 3 3 PRIMARY TREATMENT Primary clarifiers 5 5 Combined sedimentation/digestion 5 Chemical addition (except chlorine, enzymes) 4 REQUIRED LABORATORY CONTROL — performed by plant personnel (highest level only) Lab work conducted outside of plant 0 Push— button or visual methods for simple test such as pH, Settleable solids 3 Additional procedures such as DO, COD, BOD, titration, solids, volatile content 5 More advanced determinations such as BOD seeding procedures, fecal coliform, nutrients, total oils, phenols, etc. 7 Highly sophisticated instrumentation, such as atomic absorption and gas chromatograph 10 10 ALTERNATIVE FATE OF EFFLUENT Direct reuse or recycle of effluent 6 Land Disposal — low rate 3 High rate 5 5 Overland flow 4 Total from page ONE (1) 49 Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 16 APPENDIX A - CLASSIFICATION WORKSHEET (CONTINUED): ITEM �: ! POINTS POSSIBLE I l ANTS SSIGNED 4 VARIATION LN RAW WASTE (highest level only) (DIM exceedances and Design Flory exceedances} Variation do not exceed those normally or tvpicaliy expected 0 0 Recurring deviations or excessive vat iato ns of 1C,D to Yr0 % in strength and. or flow 2 Recurring deviations or excessive variations of rnore than 200 % in srength anior flow 4 I Raw wastes subject to toxic waste discharge i9 6 SECONDARY TREATME I Trickling titter and other fixed film media with secondary clarifiers 10 Activated sludge with secondary clariners krnc'_ sding extended aeration and oxidation ditches) 15 15 Stabilization ponds without aeration 5 Aerated lagoon 8 Advanced Waste Treatment Polish_ng Pond 2 Chemical. physical —without secondary 15 Chemical:phvsical — foIlowing secondary 10 Biological or chemical/biological 12 Carbon regeneration 4 DISINFECTIOI\ Chlorination or comparable 5 f Dechlorination j 2 i On -site generation of disinfectant (except UV light) 5 UV light 4 4 SOLIDS HANDLING - SLUDGE Solids Handling Thickening 5 5 Anaerobic digestion 10 1G Aerobic digestion 6 Evaporative sludge drying 2 Mechanical dewatering 8 8 Solids reduction (incineration, wet oxidation) 12 Land application 6 6 Total from page TWO (2) . 48 Total from page ONE (1) 49 Grand Totael : - ' 97 rg A 71 points or greater r B: 51 points - 70 points r C.: 2,6points - 50 points r D: 0 points -25 points Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 17 APPENDIX B- RPA (Reasonable Potential Analysis) RFSVLTs: Note: To keep the renewal limitations consistent with the draft final expansion permit, we used the Reasonable Potential Analysis (RPA) from October 2008 revision of the Antidegradation Report. Discharge monitoring data ranged from 2003- 2008. Review of the 2008-2010 discharge monitoring data found maximum values that were lower or equivalent to those presented below. Cadmium had a slightly higher maximum value in a 2010 sampling event; however, no reasonable potential to exceed was found as presented in the table below. Program staff are confident that there is no reasonable potential to exceed for the parameters listed below. Total recoverable lead was slightly above aquatic life standard (AQLS) when comparing the receiving stream concentration; however, as stated in the discussion section above for outfall 007, the dissolved component of the total recoverable lead was 03 ug/L, which was well below the AQLS of 7.7 ug/L. The parameters in the table below are parameters that are in the current permit. The result of the RPA is that no change in the current permit limitations for the parameters listed below. Outfall #007 Classified P streams only MSD, Missouri Facility Name River WWTF Permit Number MO-0004391 Stream name Missouri River C - (C..* Qs) + (C.* Qe) (Qe + Qe) Qs . 3046 • 28804 Qs-1Q10• 413 . Qs - 30Q10 = 8093.8 Qs acute = 434 Os chronic = 4848 (0.025*1 Q10) (0.25*30Q10) All metals are total recoveraoie. except Cus ror: chromium VI Oa = Stream 7Q10 flow (leis), or 1 Q10, or 30010 Oa = Effluent design flow (ftals) Cus = combined stream concentrations (see Footnote 1 below) Ce = maximum effluent concentration na = not aopllcable UNTTS: Metals=ug!L; Chronic Receiving Receiving Drinking Maximum Stream Stream Stream Aquaie Life Aquatic Life Water Concentration Concentrations RPTE Concentration Concentration RPTE Acute (Cc) Chronic (Cc) Standard (Ce) (Cus)1 Calculation (C)- MZ (C)-ZID (YIN) Ammonia, Nitrates, O&G = man.; E. cols=cfuneeml Ammonia (May -Oct) 12.1 1.5 22.4 0.03 32.3 0.1882 2.0636 N Ammonia (Nov -Apr) 12.1 3.1 29.8 0.03 54.9 0.2391 2.7182 N E. coil NA NA NA NA NA NA NA NA NA Cadmium 10.20 0.5 5 9 0.28 7.80 0.3807 1.0727 N Chromium III 3180.00 212 100 16 4.78 48.20 4.8838 5.8000 N Chromium VI 15.00 10 15.7 0.41 47.90 0.5514 1.8000 N Lead 197.10 7.7 15 20 15.10 124.10 15.1453 15.5455 Y Oil and Grease NA NA NA NA NA NA NA NA NA Nitrates 10 18.50 1.40 72.00 1.5582 2.9545 N Footnote1: Receiving stream concentration was obtained from the USGS water quality sampling station - ssou- . Cus represents a combination of existing water quality data (upstream monitoring data and Duckett Creek facilities concentrations) It is a calculated value. EWQ from the USGS WQ sampling station was unfiltered or total recoverable. Lead is Tier 1, thus use 901h percentile sampling data. Note: Lead receiving stream concentration is compared to WQS. Assumptions and Basis: RPTE calculation was based on values provided by MEC Water Resources, who analyzed the discharge monitoring data for the Missouri River WWTF. WQ Criteria: Aquatic life chronic and acute standards were converted to total recoverable. Hardness of 200 mg/L was used to calculate criteria for metals that are hardness dependent. Hardness data was obtained from 2005-07 USGS Water Quality Station at Chesterfield, Mo. N/A - Not Applicable Units are (µg/L) unless otherwise noted. Receiving Stream Concentration. It is the concentration of a toxicant or the parameter toxicity in the receiving water after mixing (if applicable). n - Is the number of samples. MF - Multiplying Factor. 99% Confidence Level and 99% Probability Basis. RPTE - Reasonable Potential to Exceed. It is where an effluent is projected or calculated to cause an excursion above a water quality standard based on a number of factors including, as a minimum, the four factors listed in 40 CFR 122.44(d)(1)(ii). Reasonable Potential Analysis is conducted as per (TSD, EPA/505/2-90-001, Section 3.3.2). A more detailed version including calculations of this RPA is available upon request. Metropolitan St. Louis Sewer District (MSD) Missouri River WWTF Fact Sheet, Page 18 APPENDLY C: MISSOURI RIVER WWTF Flow Diagram ..-•• • • 41r, - , L V , --1 I . • tri i• '•••,,•A t 4 ! • LL: • I-1 ; • j•-Csr:, 41, brew; ••• Pk* F•a,-..,.• iuhme F••••••••mpilan IMV3 54170 • MSC %IA 1-1141:1 - 112.412.004 r E FIL41 .. . . 1 1 • .. — i ii , m 1 m...... ' -. 1 — 1,0 I 1 ..e '.... 1 _i_ .14111r.' ---. iI ....... .../....,_,, ..1. . , ---* _ . L1.1.;7 ...... Z., 15/Zadjj Takroa.• nth.), ▪ drr., ft• t0e:fit, L7d.• La AGE reAsu-Tila m•dels 41• ...axvi e, 1.: ,4 ;r•c•,', .• • 1•113•: ,I.e;dEe • WT. Af, IT WEL .11., XL:12 Lou. ;•:‘ L• , •,41•V eta °47.1Ht 7,9 Ef arkai ik 5Err n••••stry .7n tht P-4.iy.tk•A ktriala re•kil Lair..• r.im tigErimPoikan St. Louis Sewer District lirieScuri River Treatment Pied Imprmemente (MSD Project 99076) Mm. • Liquid Process Schematic Diagram