Attachment 6C Bloomsdale Lagoon Permit.pdf

April 7, 2023

Missouri Department of Transportation

2675 N. Main Street

Sikeston, MO 63801

Dear Permittee:

Pursuant to the Federal Water Pollution Control Act, under the authority granted to the State of

Missouri and in compliance with the Missouri Clean Water Law, we have issued and are enclosing your Missouri State Operating Permit to discharge from MODOT, I-55 Rest Area-

Bloomsdale Wastewater Treatment Facility.

Please read your permit and enclosed Standard Conditions. They contain important information on monitoring requirements, effluent limitations, sampling frequencies and reporting requirements.

Monitoring reports required by the special conditions must be submitted on a periodic basis via the Missouri Department of Natural Resources’ electronic Discharge Monitoring Report (eDMR) system unless waived, or can be submitted on the enclosed forms if you are subject to an eDMR registration schedule as established in the permit. Upon registration, please access the eDMR system via the following link: Missouri Gateway for Environmental Management (MoGEM) |

Missouri Department of Natural Resources. If you experience difficulties with using the eDMR system, you may contact edmr@dnr.mo.gov or call 855-789-3889 or 573-526-2082 for assistance.

This permit may include requirements with which you may not be familiar. If you would like the

Department to meet with you to discuss how to satisfy the permit requirements, an appointment can be set up by contacting the Southeast Regional Office by phone at 573-840-9750, by email at

SERO@dnr.mo.gov, or by mail at 2155 North Westwood Boulevard, Poplar Bluff, MO 63901.

These visits are called Compliance Assistance Visits and focus on explaining the requirements to the permit holder.

This permit is both your Federal National Pollutant Discharge Elimination System Permit and your new Missouri State Operating Permit and replaces all previous Missouri State Operating

Permits issued for this facility under this permit number. In all future correspondence regarding this facility, please refer to your Missouri State Operating Permit number and facility name as shown on page one of the permit.

https://dnr.mo.gov/data-e-services/missouri-gateway-environmental-management-mogem mailto:edmr@dnr.mo.gov mailto:SERO@dnr.mo.gov

Missouri Department of Transportation

If you were adversely affected by this decision, you may be entitled to an appeal before the

Administrative Hearing Commission (AHC) pursuant to Section 621.250, RSMo. To appeal, you must file a petition with the AHC within 30 days after the date this decision was mailed or the date it was delivered, whichever date was earlier. If any such petition is sent by registered mail or certified mail, it will be deemed filed on the date it is mailed; if it is sent by any method other than registered mail or certified mail, it will be deemed filed on the date it is received by the

AHC. Contact information for the AHC is: Administrative Hearing Commission, United States

Post Office Building, Third Floor, 131 West High Street, P.O. Box 1557, Jefferson City, MO

65102, phone: 573-751-2422, fax: 573-751-5018, and website: www.oa.mo.gov/ahc.

Please be aware that this facility may also be subject to any applicable county or other local ordinances or restrictions.

If you have any questions concerning this permit, please do not hesitate to contact the

Department’s Water Protection Program at P.O. Box 176, Jefferson City, MO 65102, or by phone at 573-751-1300. Thank you.

Sincerely, WATER PROTECTION PROGRAM

John Hoke

Director

JH/vs

Enclosure

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 RSMo, hereinafter, the Law), and the Federal Water Pollution Control Act (Public Law 92-500, 92nd Congress) as amended, Permit No.: MO-0090581

Owner: Missouri Department of Transportation Address: 2675 N. Main Street, Sikeston, MO 63801

Continuing Authority: Same as above Address: Same as above

Facility Name: MODOT, I-55 Rest Area-Bloomsdale Wastewater Treatment Facility Facility Address: 0.44 miles NW of US Hwy 61 and Carron Rd intersection, Bloomsdale, MO 63627

Legal Description: Sec. 3, T38N, R7E, Ste. Genevieve County UTM Coordinates: X = 741692, Y = 4212818

Receiving Stream: Tributary to Fourche a DuClos Creek (U) First Classified Stream and ID: 100K Extent-Remaining Streams (C) (3960) USGS Basin & Sub-watershed No.: (07140101-0906) authorizes activities pursuant to the terms and conditions of this permit in accordance with the Missouri Clean Water Law and/or the National Pollutant Discharge Elimination System; it does not apply to other regulated activities.

FACILITY DESCRIPTION

Outfall #001 – POTW The use or operation of this facility shall be by or under the supervision of a Certified “C” Operator.

Aerated two-cell lagoon / sand filter / ultraviolet disinfection / sludge retained in lagoon.

Design population equivalent is 633.

Design flow is 16,134 gallons per day.

Actual flow is 2,100 gallons per day.

Design sludge production is 0.24 dry tons/year.

Permitted Feature INF – Influent Monitoring Location – Influent manhole UTM Coordinates: X = 741598, Y = 4212966

April 1, 2023 Effective Date

March 31, 2028 Expiration Date John Hoke, Director, Water Protection Program

Permit No. MO-0090581

OUTFALL

#001

TABLE A.

FINAL EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS

The permittee is authorized to discharge from outfall number(s) as specified in the application for this permit. The final effluent limitations in Table A shall become effective on April 1, 2023. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

EFFLUENT PARAMETER(S) UNITS

FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS

DAILY

MAXIMUM

WEEKLY

AVERAGE

MONTHLY

AVERAGE

MEASUREMENT

FREQUENCY

SAMPLE

TYPE

eDMR Limit Set: Q

Flow MGD * * once/quarter*** 24 hr.

estimate

Biochemical Oxygen Demand5 mg/L 45 30 once/quarter*** grab

Total Suspended Solids mg/L 45 30 once/quarter*** grab

E. coli (Note 1, Page 3) #/100mL 1,030 206 once/quarter*** grab

Ammonia as N (Jan 1 – Mar 31) mg/L * * once/quarter*** grab

Ammonia as N (Apr 1 – Jun 30) mg/L 10.1 1.5 once/quarter*** grab

Ammonia as N (Jul 1 – Sep 30) mg/L 8.4 1.0 once/quarter*** grab

Ammonia as N (Oct 1 – Dec 31) mg/L * * once/quarter*** grab

EFFLUENT PARAMETER(S) UNITS MINIMUM MAXIMUM MEASUREMENT

FREQUENCY

SAMPLE

TYPE

pH – Units** SU 6.5 9.0 once/quarter*** grab

EFFLUENT PARAMETER(S) UNITS

MONTHLY

AVERAGE

MINIMUM

MEASUREMENT

FREQUENCY

SAMPLE

TYPE

Biochemical Oxygen Demand5 – Percent Removal (Note 2, Page 3) % 85 once/quarter*** calculated

Total Suspended Solids – Percent Removal (Note 2, Page 3) % 85 once/quarter*** calculated

MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE JULY 28, 2023.

* Monitoring requirement only.

** pH is measured in pH units and is not to be averaged.

*** See table below for quarterly sampling.

Quarterly Minimum Sampling Requirements

Quarter Months E. coli All Other Parameters Report is Due

First January, February, March Not required to sample. Sample at least once during any month of the quarter April 28th

Second April, May, June Sample at least once during any month of the quarter

Sample at least once during any month of the quarter July 28th

Third July, August, September Sample at least once during any month of the quarter

Sample at least once during any month of the quarter October 28th

Fourth October Sample once during October Sample at least once during any month of the quarter January 28th November & December Not required to sample.

PERMITTED

FEATURE

INF

TABLE B.

INFLUENT MONITORING REQUIREMENTS

The monitoring requirements in Table B shall become effective on April 1, 2023 and remain in effect until expiration of the permit. The influent wastewater shall be monitored by the permittee as specified below:

PARAMETER(S) UNITS

MONITORING REQUIREMENTS

DAILY

MAXIMUM

WEEKLY

AVERAGE

MONTHLY

AVERAGE

MEASUREMENT

FREQUENCY SAMPLE TYPE

eDMR Limit Set: IQ

Biochemical Oxygen Demand5 (Note 2) mg/L * once/quarter*** grab

Total Suspended Solids (Note 2) mg/L * once/quarter*** grab

MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE JULY 28, 2023.

* Monitoring requirement only.

*** See table below for quarterly sampling requirements.

Quarterly Minimum Sampling Requirements

Quarter Months Quarterly Influent Parameters Report is Due

First January, February, March Sample at least once during any month of the quarter April 28th Second April, May, June Sample at least once during any month of the quarter July 28th Third July, August, September Sample at least once during any month of the quarter October 28th

Fourth October, November, December Sample at least once during any month of the quarter January 28th

Note 1 – Effluent limitations and monitoring requirements for E. coli are applicable only during the recreational season from April 1 through October 31. The Monthly Average Limit for E. coli is expressed as a geometric mean. The Weekly Average for E.

coli will be expressed as a geometric mean if more than one (1) sample is collected during a calendar week (Sunday through Saturday).

Note 2 – Influent sampling for BOD5 and TSS is not required when the facility does not discharge effluent during the reporting period. Samples are to be collected prior to any treatment process. Calculate Percent Removal by using the following formula: [(Average Influent –Average Effluent) / Average Influent] x 100% = Percent Removal. Influent and effluent samples are to be taken during the same month. The Average Influent and Average Effluent values are to be calculated by adding the respective values together and dividing by the number of samples taken during the month. Influent samples are to be collected as a grab sample.

C. STANDARD CONDITIONS

In addition to specified conditions stated herein, this permit is subject to the attached Parts I, II, & III standard conditions dated August 1, 2014, May 1, 2013, and August 1, 2019, and hereby incorporated as though fully set forth herein. Annual reports required per Standard Conditions Part III Section K shall be submitted online to the Department via the Department's eDMR system as an attachment. This supersedes Standard Conditions Part III Section K #4. EPA reports shall continue to be submitted online via the Central Data Exchange system.

D. SPECIAL CONDITIONS

1. Electronic Discharge Monitoring Report (eDMR) Submission System. Per 40 CFR Part 127 National Pollutant Discharge

Elimination System (NPDES) Electronic Reporting Rule, reporting of effluent monitoring data and any report required by the permit (unless specifically directed otherwise by the permit) shall be submitted by the permittee via an electronic system to ensure timely, complete, accurate, and nationally consistent set of data about the NPDES program. All reports uploaded into the system shall be reasonably named so they are easily identifiable, such as “WET Test Chronic Outfall 002 Jan 2023,” or “Outfall 004 Daily Data Mar 2025.”

(a) eDMR Registration Requirements. The permittee must register with the Department’s eDMR system through the Missouri

Gateway for Environmental Management (MoGEM) before the first report is due. Registration and other information regarding MoGEM can be found at https://dnr.mo.gov/data-e-services/missouri-gateway-environmental-management-mogem. Information about the eDMR system can be found at https://dnr.mo.gov/water/business-industry-other-entities/reporting/electronic-discharge-monitoring-reporting-system-edmr. The first user shall register as an Organization Official and the association to the facility must be approved by the Department. Regarding Standard Conditions Part I, Section B, #7, the eDMR system is currently the only Department approved reporting method for this permit unless a waiver is granted by the Department. See paragraph (c) below.

(b) Electronic Submissions. To access the eDMR system, use the following link in your web browser:

https://apps5.mo.gov/mogems/welcome.action. If you experience difficulties with using the eDMR system you may contact edmr@dnr.mo.gov or call 855-789-3889 or 573-526-2082 for assistance.

(c) Waivers from Electronic Reporting. The permittee must electronically submit compliance monitoring data and reports unless a waiver is granted by the Department in compliance with 40 CFR Part 127. The permittee may obtain an electronic reporting waiver by first submitting an eDMR Waiver Request Form: https://dnr.mo.gov/document-search/electronic-discharge-monitoring-report-waiver-request-form-mo-780-2692. The Department will either approve or deny this electronic reporting waiver request within 120 calendar days.

2. The full implementation of this operating permit, which includes implementation of any applicable schedules of compliance, shall constitute compliance with all applicable federal and state statutes and regulations in accordance with §644.051.16, RSMo, and the Clean Water Act (CWA) section 402(k); however, this permit may be reopened and modified, or alternatively revoked and reissued:

(a) To 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 CWA, 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.

3. All outfalls must be clearly marked in the field.

4. Report as no-discharge when a discharge does not occur during the report period.

5. Reporting of Non-Detects:

(a) An analysis conducted by the permittee or their contracted laboratory shall be conducted in such a way that the precision and accuracy of the analyzed result can be enumerated.

(b) See sufficiently sensitive test method requirements in Standard Conditions Part I, Section A, No. 4 regarding proper testing and method minimum levels used for sample analysis.

(c) The permittee shall not report a sample result as “Non-Detect” without also reporting the method minimum level of the test.

Reporting as “Non Detect” without also including the method minimum level, will be considered failure to report, which is a violation of this permit.

(d) The permittee shall provide the “Non-Detect” sample result using the less than symbol and the method minimum level (e.g., <50 µg/L, if the method minimum level for the parameter is 50 µg/L).

(e) Where the permit contains a Department determined Minimum Quantification Level (ML) and the permittee is granted authority in the permit to report zero in lieu of the < ML for a specified parameter (conventional, priority pollutants, metals, etc.), then zero (0) is to be reported for that parameter.

(f) For the daily maximum, the facility shall report the highest value. If the highest value was a non-detect, use the less than “<” symbol and the laboratory’s highest method minimum level.

(g) For reporting an average based on all non-detected values, remove the “<” sign from the values, average the values, and then add the “<” symbol back to the resulting average.

(h) For reporting an average based on a mix of detected and non-detected values (not including E. coli), assign a value of “0” for all non-detects for that reporting period and report the average of all the results.

(i) When E. coli is not detected above the method minimum level, the permittee must report the data qualifier signifying less than detection limit for that parameter (e.g., <1 #/100mL, if the method minimum level is 1 #/100mL). For reporting a geometric mean based on a mix of detected and non-detected values, use one-half of the detection limit (instead of zero) for non-detects when calculating geometric means.

https://dnr.mo.gov/data-e-services/missouri-gateway-environmental-management-mogem https://dnr.mo.gov/data-e-services/missouri-gateway-environmental-management-mogem https://dnr.mo.gov/water/business-industry-other-entities/reporting/electronic-discharge-monitoring-reporting-system-edmr https://dnr.mo.gov/water/business-industry-other-entities/reporting/electronic-discharge-monitoring-reporting-system-edmr https://apps5.mo.gov/mogems/welcome.action mailto:edmr@dnr.mo.gov https://dnr.mo.gov/document-search/electronic-discharge-monitoring-report-waiver-request-form-mo-780-2692 https://dnr.mo.gov/document-search/electronic-discharge-monitoring-report-waiver-request-form-mo-780-2692

(j) See the Fact Sheet Appendix - Non-Detect Example Calculations for further guidance.

6. It is a violation of the Missouri Clean Water Law to fail to pay fees associated with this permit (644.055 RSMo).

7. 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. To request a modification of the operational control testing requirements listed in 10 CSR 20-9, the permittee shall submit a permit modification application and fee to the Department requesting a deviation from the operational control monitoring requirements.

Upon approval of the request, the Department will modify the permit.

8. Bypasses are not authorized at this facility unless they meet the criteria in 40 CFR 122.41(m). If a bypass occurs, the permittee shall report in accordance to 40 CFR 122.41(m)(3), and with Standard Condition Part I, Section B, subsection 2. Bypasses are to be reported to the Southeast Regional Office during normal business hours or by using the online Sanitary Sewer Overflow/Facility Bypass Application located at: https://dnr.mo.gov/data-e-services/missouri-gateway-environmental-management-mogem or the Environmental Emergency Response spill-line at 573-634-2436 outside of normal business hours.

Once an electronic reporting system compliant with 40 CFR Part 127, the National Pollutant Discharge Elimination System (NPDES) Electronic Reporting Rule, is available all bypasses must be reported electronically via the new system. Blending, which is the practice of combining a partially-treated wastewater process stream with a fully-treated wastewater process stream prior to discharge, is not considered a form of bypass. If the permittee wishes to utilize blending, the permittee shall file an application to modify this permit to facilitate the inclusion of appropriate monitoring conditions.

9. The facility must be sufficiently secured to restrict entry by children, livestock and unauthorized persons as well as to protect the facility from vandalism.

10. An Operation and Maintenance (O & M) manual shall be maintained by the permittee and made available to the operator. The O & M manual shall include key operating procedures and a brief summary of the operation of the facility.

11. An all-weather access road to the treatment facility shall be maintained.

12. The outfall sewer shall be protected and maintained against the effects of floodwater, ice, or other hazards as to reasonably ensure its structural stability, freedom from stoppage, and that a sample of the effluent can be obtained at a point after the final treatment process and before the discharge mixes with the receiving waters.

13. The lagoon shall be operated and maintained to ensure their structural integrity, which includes maintaining adequate freeboard and keeping the berms free of deep-rooted vegetation, animal dens, or other potential sources of damage.

14. The facility shall ensure that adequate provisions are provided to prevent or minimize surface water intrusion into the lagoon and to divert stormwater runoff around the lagoon and protect embankments from erosion.

15. The media in the filter beds shall be properly maintained to prevent surface pooling, vegetative growth, and accumulation of leaf litter.

16. This facility does not currently retain an operator with the correct level of certification required to operate the wastewater treatment facility. Missouri Clean Water Law and its implementing regulation 10 CSR 20-9.020(2)(F) allows the Department to develop a schedule of activities including the date by which compliance shall be obtained. The facility shall submit a written report to the Southeast Regional Office within six (6) months from the effective date of this operating permit. The report shall contain:

(a) The Certified Operators’ name,

(b) The Certified Operators’ certification number,

(c) A copy of the contract between the City and the Certified Operator; and/or

(d) A written correspondence from the City indicating that they have hired the services of the Certified Operator.

E. NOTICE OF RIGHT TO APPEAL

If you were adversely affected by this decision, you may be entitled to pursue an appeal before the administrative hearing commission (AHC) pursuant to Sections 621.250 and 644.051.6 RSMo. To appeal, you must file a petition with the AHC within thirty days after the date this decision was mailed or the date it was delivered, whichever date was earlier. If any such petition is sent by registered mail or certified mail, it will be deemed filed on the date it is mailed; if it is sent by any method other than registered mail or certified mail, it will be deemed filed on the date it is received by the AHC. Any appeal should be directed to:

Administrative Hearing Commission

U.S. Post Office Building, Third Floor 131 West High Street, P.O. Box 1557

Jefferson City, MO 65102-1557 Phone: 573-751-2422

Fax: 573-751-5018 Website: https://ahc.mo.gov https://ahc.mo.gov/

MODOT, Bloomdale Rest Area WWTF Fact Sheet Page #1

MISSOURI DEPARTMENT OF NATURAL RESOURCES

FACT SHEET

FOR THE PURPOSE OF RENEWAL

OF

MO-0090581

MODOT, BLOOMDALE REST AREA WWTF

The Federal Water Pollution Control Act ("Clean Water Act" Section 402 Public Law 92-500 as amended) established the National Pollutant 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 stormwater 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)(A)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.

Part I – Facility Information

Application Date: 06/30/2022 Expiration Date: 12/31/2021

Facility Type and Description: POTW Aerated two-cell lagoon / sand filter / ultraviolet disinfection / sludge retained in lagoon.

OUTFALL(S) TABLE:

OUTFALL DESIGN FLOW (CFS) TREATMENT LEVEL EFFLUENT TYPE

#001 0.025 Secondary Domestic

Comments:

Changes in this permit for Outfall #001 include the revision of Ammonia as N effluent limitations according to new eco-regional derivation methods, and the revision of percent removal requirements as 65% removal is only appropriate for equivalent to secondary treatment and this facility achieves secondary treatment as a result of the sand filter. See Part II of the Fact Sheet for further information regarding the addition, revision, and removal of effluent parameters. Special conditions were updated to include the reporting of Non-detects, and the Electronic Discharge Monitoring Report (eDMR) Submission System. Special conditions related to connection to a higher preference authority were removed as there is no higher preference authority in the area. Special conditions related to design requirements established in 10 CSR 20-8 were removed as these are self-implementing and required to be met prior to the first permit’s issuance.

Part II – Effluent Limitations and Monitoring Requirements

OUTFALL #001 – 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.

Fact Sheet Page #2

OUTFALL #001 - RECEIVING STREAM INFORMATION

RECEIVING STREAM(S) TABLE:

WATER-BODY NAME CLASS WBID DESIGNATED USES* 12-DIGIT HUC

DISTANCE TO

CLASSIFIED

SEGMENT (MI)

Tributary to Fourche a DuClos

Creek - - General Criteria 07140101-0906 0.2

100K Extent-Remaining Streams C 3960 AHP (WWH), WBC-B, SCR, HHP, IRR, LWP

*As per 10 CSR 20-7.031 Missouri Water Quality Standards, the Department defines the Clean Water Commission’s water quality objectives in terms of "water uses to be maintained and the criteria to protect those uses." The receiving stream and 1st classified receiving stream’s beneficial water uses to be maintained are in the receiving stream table in accordance with [10 CSR 20-7.031(1)(C)].

Uses found in the receiving streams table, above:

10 CSR 20-7.031(1)(C)1.:

AHP = Aquatic Habitat Protection - To ensure the protection and propagation of fish, shellfish, and wildlife. AHP is further subcategorized as:

WWH = Warm Water Habitat;

CLH = Cool Water Habitat;

CDH= Cold Water Habitat;

EAH = Ephemeral Aquatic Habitat;

MAH = Modified Aquatic Habitat;

LAH = Limited Aquatic Habitat.

This permit uses Aquatic Life Protection effluent limitations in 10 CSR 20-7.031 Table A for all aquatic habitat designations unless otherwise specified.

10 CSR 20-7.031(1)(C)2.: Recreation in and on the water WBC = Whole Body Contact recreation where the entire body is capable of being submerged. WBC is further subcategorized as:

WBC-A = Whole body contact recreation that supports swimming uses and has public access;

WBC-B = Whole body contact recreation that supports swimming;

SCR = Secondary Contact Recreation (like fishing, wading, and boating).

10 CSR 20-7.031(1)(C)3. to 7.:

HHP = Human Health Protection as it relates to the consumption of fish;

IRR = Irrigation - Application of water to cropland or directly to cultivated plants that may be used for human or livestock consumption;

LWP = Livestock and wildlife protection - Maintenance of conditions in waters to support health in livestock and wildlife;

DWS = Drinking water supply;

IND = Industrial water supply

10 CSR 20-7.031(1)(C)8-11.: Wetlands (10 CSR 20-7.031 Table A currently does not have corresponding habitat use criteria for these defined uses) WSA = Storm- and flood-water storage and attenuation;

WHP = Habitat for resident and migratory wildlife species;

WRC = Recreational, cultural, educational, scientific, and natural aesthetic values and uses;

WHC = Hydrologic cycle maintenance.

10 CSR 20-7.031(6):

GRW = Groundwater

RECEIVING STREAM(S) LOW-FLOW VALUES:

RECEIVING STREAM

LOW-FLOW VALUES (CFS)

1Q10 7Q10 30Q10

Tributary to Fourche a DuClos Creek 0 0 0

MIXING CONSIDERATIONS

Mixing Zone: Not Allowed [10 CSR 20-7.031(5)(A)4.B.(I)(a)].

Zone of Initial Dilution: Not Allowed [10 CSR 20-7.031(5)(A)4.B.(I)(b

Fact Sheet Page #3

Receiving Water Body’s Water Quality 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 TMDL calculation

This facility discharges to a stream with an EPA approved TMDL for chlordanes and PCBs. This facility is not considered a source of the impairment as these chemicals have been banned from production since 1988 and 1977, respectively, and are not used in domestic facilities.

The Department has not conducted a stream survey for this waterbody. When a stream survey is conducted, more information may be available about the receiving stream.

CHANGES TO EFFLUENT LIMITATIONS TABLE:

PARAMETER Unit Basis for Limits

Daily Maximum

Weekly Average

Monthly Average

Previous Permit Limit

Sampling Frequency

Reporting Frequency

Sample Type

Ammonia as N (Apr – Jun) mg/L 2, 3 10.1 1.5 3.6/1.4 1/quarter quarterly G Ammonia as N (Jul – Sep) mg/L 2, 3 8.4 1.0 3.6/1.4 1/quarter quarterly G

PARAMETER Unit Basis for Limits

Daily Minimum Monthly

Avg. Min Previous

Permit Limit Sampling Frequency

Reporting Frequency

Sample Type

BOD5 Percent Removal % 1 85 85 1/quarter quarterly M TSS Percent Removal % 1 85 85 1/quarter quarterly M

* - Monitoring requirement only. **** - C = 24-hour composite ** - #/100mL; the Monthly Average for E. coli is a geometric mean. G = Grab *** - Parameter not previously established in previous state operating permit. T = 24-hr. total

E = 24-hr. estimate M = Measured/calculated

Basis for Limitations Codes:

1. State or Federal Regulation/Law 5. Antidegradation Policy 9. WET Test Policy

2. Water Quality Standard (includes RPA) 6. Water Quality Model 10. Multiple Discharger Variance

3. Water Quality Based Effluent Limits 7. Best Professional Judgment 11. Nutrient Criteria Implementation Plan

4. Antidegradation Review 8. TMDL or Permit in lieu of TMDL

OUTFALL #001 – 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.

• Biochemical Oxygen Demand (BOD5). Operating permit retains 45 mg/L as a Weekly Average and 30 mg/L as a Monthly

Average from the previous permit. Effluent limits were established in accordance with 10 CSR 20-7.015(9)(A)1 as technology-based effluent limitations. Typically relaxed conventional limits are established in facilities that use lagoons or sand filters, however this facility has historically been able to meet these effluent limitations and these effluent limitations have been assigned since the sand filter was installed at this facility in 2011. Additionally, 10 CSR 20-7.015(9)(A) establishes that the most stringent effluent limitation should be chosen out of the possible limit sets. As such, the limits will be maintained.

• Total Suspended Solids (TSS). Operating permit retains 45 mg/L as a Weekly Average and 30 mg/L as a Monthly Average from the previous permit. Effluent limits were established in accordance with 10 CSR 20-7.015(9)(A)1 as technology-based effluent limitations. Typically relaxed conventional limits are established in facilities that use lagoons or sand filters, however this facility has historically been able to meet these effluent limitations and these effluent limitations have been assigned since the sand filter was installed at this facility in 2011. Additionally, 10 CSR 20-7.015(9)(A) establishes that the most stringent effluent limitation should be chosen out of the possible limit sets. As such, the limits will be maintained.

Fact Sheet Page #4

• Escherichia coli (E. coli). Monthly average of 206 per 100 mL as a geometric mean and Weekly Average of 1,030 per 100 mL as a geometric mean during the recreational season (April 1 – October 31), for discharges within two miles upstream of segments or lakes with Whole Body Contact Recreation (B) designated use of the receiving stream, as per 10 CSR 20-7.015(9)(B). An effluent limit for both monthly average and weekly average is required by 40 CFR 122.45(d). The Geometric Mean is calculated by multiplying all of the data points and then taking the nth root of this product, where n = # of samples collected. For example: Five E. coli samples were collected with results of 1, 4, 6, 10, and 5 (#/100mL). Geometric Mean = 5th root of (1)(4)(6)(10)(5) = 5th root of 1,200 = 4.1 #/100mL.

• Total Ammonia Nitrogen. Early Life Stages Present Total Ammonia Nitrogen criteria apply [10 CSR 20-7.031(5)(B)7.C. & Table

B3]. Background total ammonia nitrogen = 0.01 mg/L. No mixing considerations allowed; therefore, WLA = appropriate criterion.

The Department previously followed the 2007 Ammonia Guidance method for derivation of ammonia limits. However, the EPA’s Technical Support Document for Water Quality-based Toxic Controls (TSD) establishes other alternatives to limit derivation. The Department has determined that the approach established in Section 5.4.2 of the TSD, which allows for direct application of both the acute and chronic wasteload allocations (WLA) as permit limits for toxic pollutants, is more appropriate limit derivation approach.

Using this method for a discharge to a waterbody where mixing is not allowed, the criterion continuous concentration (CCC) and the criterion maximum concentration (CMC) will equal the chronic and acute WLA respectively. The WLAs are then applied as effluent limits, per Section 5.4.2 of the TSD, where the CMC is the Daily Maximum and the CCC is the Monthly Average. The direct application of both acute and chronic criteria as WLA is also applicable for facilities that discharge into receiving waterbodies with mixing considerations. The CCC and CMC will need to be calculated into WLA with mixing considerations using the mass-balance equation:

( )Qe CsQsCQsQeCe ×−+

Where C = downstream concentration Ce = effluent concentration Cs = upstream concentration Qe = effluent flow Qs = upstream flow

In the event that mixing considerations derive an AML less stringent than the MDL, the AML and MDL will be equal and based on the MDL.

Quarter Temp (°C)* pH (SU)* Total Ammonia Nitrogen CCC (mg/L)

Total Ammonia Nitrogen CMC (mg/L)

1st 7.4 7.8 3.1 12.1 2nd 24.0 7.9 1.5 10.1 3rd 28.6 8.0 1.0 8.4 4th 15.9 8.0 2.2 8.4

* Ecoregion Data (Interior River Valleys and Hills)

1st Quarter Monitoring only for 1st Quarter. The reasonable potential analysis determined that Ammonia in this facility’s discharge is unlikely to exceed water quality standards for Ammonia in 1st Quarter.

2nd Quarter Chronic WLA:

Ce = ((0.025 + 0.0)1.5 – (0.0 * 0.01))/0.025 = 1.5 mg/L

Acute WLA:

Ce = ((0.025 + 0.0)10.1 – (0.0 * 0.01))/0.025 = 10.1 mg/L

Chronic WLA = AML = 1.5 mg/L Acute WLA = MDL = 10.1 mg/L

3rd Quarter Chronic WLA:

Ce = ((0.025 + 0.0)1.0 – (0.0 * 0.01))/0.025 = 1.0 mg/L

Acute WLA:

Ce = ((0.025 + 0.0)8.4 – (0.0 * 0.01))/0.025 = 8.4 mg/L

Chronic WLA = AML = 1.0 mg/L Acute WLA = MDL = 8.4 mg/L

4th Quarter Monitoring only for 4th Quarter. The reasonable potential analysis determined that Ammonia in this facility’s discharge is unlikely to exceed water quality standards for Ammonia in 4th Quarter.

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• pH. 6.5-9.0 SU. pH limitations of 6.0-9.0 SU [10 CSR 20-7.015] are not protective of the in-stream Water Quality Standard, which states that water contaminants shall not cause pH to be outside the range of 6.5-9.0 SU.

• Biochemical Oxygen Demand (BOD5) Percent Removal. In accordance with 40 CFR Part 133, removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to BOD5 and TSS for Publicly Owned Treatment Works (POTWs)/municipals. This facility is required to meet 85% removal efficiency for BOD5 as sand filters are considered secondary treatment devices. Removal efficiencies of 65%, as established in the previous permit, are only appropriate for treatment considered equivalent to secondary, which encompasses lagoons and trickling filters, not sand filters.

• Total Suspended Solids (TSS) Percent Removal. In accordance with 40 CFR Part 133, removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to BOD5 and TSS for Publicly Owned Treatment Works (POTWs)/municipals. This facility is required to meet 85% removal efficiency for BOD5 as sand filters are considered secondary treatment devices. Removal efficiencies of 65%, as established in the previous permit, are only appropriate for treatment considered equivalent to secondary, which encompasses lagoons and trickling filters, not sand filters.

Sampling Frequency Justification: The Department has determined that previously established sampling and reporting frequency is sufficient to characterize the facility’s effluent and be protective of water quality Sampling for E. coli is set at quarterly per 10 CSR 20-7.015(9)(D)7.C.

Sampling Type Justification: As per 10 CSR 20-7.015, BOD5 and TSS collected for lagoons and media filters may be grab samples.

Grab samples must be collected for pH and E. coli in accordance with recommended analytical methods. For further information on sampling and testing methods please review 10 CSR 20-7.015(9)(D) 2.

PERMITTED FEATURE INF – INFLUENT MONITORING

The monitoring requirements established in the below Monitoring Requirements 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 the monitoring requirements listed in this table.

Influent Parameters

• Biochemical Oxygen Demand (BOD5) and Total Suspended Solids (TSS). An influent sample is required to determine the removal efficiency. In accordance with 40 CFR Part 133, removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to BOD5 and TSS for Publicly Owned Treatment Works (POTWs)/municipals.

Sampling Frequency Justification: The sampling and reporting frequencies for influent BOD5 and TSS have been established to match the required sampling frequency of these parameters in the effluent.

Sampling Type Justification: Sample types for influent parameters were established to match the required sampling type of these parameters in the effluent. Samples should be analyzed as soon as possible after collection and/or properly preserved according to method requirements.

OUTFALL #001 – GENERAL CRITERIA CONSIDERATIONS:

In accordance with 40 CFR 122.44(d)(1), effluent limitations shall be placed into the permit for those pollutants which have been determined to cause, have the reasonable potential to cause, or contribute to an excursion above any State water quality standard, including State narrative criteria for water quality. The rule further states that pollutants which have been determined to cause, have the reasonable potential to cause, or contribute to an excursion above a narrative criterion within an applicable State water quality standard, the permit shall contain a numeric effluent limitation to protect that narrative criterion. In order to comply with this regulation, the permit writer will complete reasonable potential determinations on whether the discharge will violate any of the general criteria listed in 10 CSR 20-7.031(4). These specific requirements are listed below followed by derivation and discussion (the lettering matches that of the rule itself, under 10 CSR 20-7.031(4)). It should also be noted that Section 644.076.1, RSMo as well as Section D

– Administrative Requirements of Standard Conditions Part I of this permit states that it shall be unlawful for any person to cause or permit any discharge of water contaminants from any water contaminant or point source located in Missouri that is in violation of sections 644.006 to 644.141 of the Missouri Clean Water Law or any standard, rule or regulation promulgated by the commission.

(A) 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. The discharge from this facility is made up of treated domestic wastewater.

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Based upon review of the Report of Compliance Inspection for the inspection conducted on December 1, 2021, no evidence of an excursion of this criterion has been observed by the Department in the past and the facility has not disclosed any other information related to the characteristics of the discharge on their permit application which has the potential to cause or contribute to an excursion of this narrative criterion. Additionally, this facility utilizes secondary treatment technology and is currently in compliance with the secondary treatment technology based effluent limits established in 40 CFR 133 and there has been no indication to the Department that the stream has had issues maintaining beneficial uses as a result of this discharge. Based on the information reviewed during the drafting of this permit, these final effluent limitations appear to have protected against the excursion of this criterion in the past. Therefore, the discharge does not have the reasonable potential to cause or contribute to an excursion of this criterion.

(B) Waters shall be free from oil, scum and floating debris in sufficient amounts to be unsightly or prevent full maintenance of beneficial uses. Please see (A) above as justification is the same.

(C) Waters shall be free from substances in sufficient amounts to cause unsightly color or turbidity, offensive odor or prevent full maintenance of beneficial uses. Please see (A) above as justification is the same.

(D) Waters shall be free from substances or conditions in sufficient amounts to result in toxicity to human, animal or aquatic life. This permit contains final effluent limitations which are protective of both acute and chronic toxicity for various pollutants that are either expected to be discharged by domestic wastewater facilities or that were disclosed by this facility on the application for permit coverage. Based on the information reviewed during the drafting of this permit, it has been determined if the facility meets final effluent limitations established in this permit, there is no reasonable potential for the discharge to cause an excursion of this criterion.

(E) Waters shall provide for the attainment and maintenance of water quality standards downstream including waters of another state.

Please see (D) above as justification is the same.

(F) There shall be no significant human health hazard from incidental contact with the water. Please see (D) above as justification is the same.

(G) There shall be no acute toxicity to livestock or wildlife watering. Please see (D) above as justification is the same.

(H) Waters shall be free from physical, chemical or hydrologic changes that would impair the natural biological community. Please see (A) above as justification is the same.

(I) 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. The discharge from this facility is made up of treated domestic wastewater. No evidence of an excursion of this criterion has been observed by the Department in the past and the facility has not disclosed any other information related to the characteristics of the discharge on their permit application which has the potential to cause or contribute to an excursion of this narrative criterion. Additionally, any solid wastes received or produced at this facility are wholly contained in appropriate storage facilities, are not discharged, and are disposed of offsite. This discharge is subject to Standard Conditions Part III, which contains requirements for the management and disposal of sludge to prevent its discharge. Therefore, this discharge does not have reasonable potential to cause or contribute to an excursion of this criterion.

Part III – 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/or economic reasons.

The facility does not discharge to a Losing Stream as defined by [10 CSR 20-2.010(40)] & [10 CSR 20-7.031(1)(O)].

ANTI-BACKSLIDING:

A provision in the Federal Regulations [CWA §303(d)(4); CWA §402(o); 40 CFR Part 122.44(l)] that requires a reissued permit to be as stringent as the previous permit with some exceptions.

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.

o Information is available which was not available at the time of permit issuance (other than revised regulations, guidance, or test methods) and which would have justified the application of a less stringent effluent limitation at the time of permit issuance.

• Ammonia as N. Effluent limitations were re-calculated for Ammonia using new DMR data and new ecoregional pH and Temperature data. The Department previously followed the 2007 Ammonia Guidance method for derivation of ammonia limits. However, the EPA’s Technical Support Document for Water Quality-based Toxic Controls (TSD) establishes other alternatives to limit derivation.

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The Department has determined that the approach established in Section 5.4.2 of the TSD, which allows for direct application of both the acute and chronic wasteload allocations (WLA) as permit limits for toxic pollutants, is more appropriate limit derivation approach. Using this method for a discharge to a waterbody where mixing is not allowed, the criterion continuous concentration (CCC) and the criterion maximum concentration (CMC) will equal the chronic and acute WLA respectively. The WLAs are then applied as effluent limits, per Section 5.4.2 of the TSD, where the CMC is the Daily Maximum and the CCC is the Monthly Average. The direct application of both acute and chronic criteria as WLA is also applicable for facilities that discharge into receiving waterbodies with mixing considerations. The CCC and CMC will need to be calculated into WLA with mixing considerations using the mass-balance equation. The newly established limitations are still protective of water quality.

o The Department determines that technical mistakes or mistaken interpretations of law were made in issuing the permit under section 402(a)(1)(b).

• The previous permit indicated “There Shall Be No Discharge of Floating Solids or Visible Foam in Other Than Trace

Amounts” under each table. The statement was not evaluated against actual site conditions therefore, this general criteria was re-assessed. It was determined that this facility does not discharge solids or foam in amounts which would indicate reasonable potential, therefore the statement was removed. Each general criteria was assessed for this facility.

ANTIDEGRADATION:

In accordance with Missouri’s Water Quality Standard [10 CSR 20-7.031(3)], for domestic wastewater discharge with new, altered, or expanding discharges, the Department is to document by means of Antidegradation Review that the use of a water body’s available assimilative capacity is justified. In accordance with Missouri’s water quality regulations for antidegradation [10 CSR 20-7.031(3)], degradation may be justified by documenting the socio-economic importance of a discharge after determining the necessity of the discharge. Facilities must submit the antidegradation review request to the Department prior to establishing, altering, or expanding discharges. See https://dnr.mo.gov/document-search/antidegradation-implementation-procedure.

No degradation was proposed in this permit action and no further review necessary. Facility did not apply for authorization to increase pollutant loading or to add additional pollutants to their discharge.

For stormwater discharges, the stormwater BMP chosen for the facility, through the antidegradation analysis performed by the facility, must be implemented and maintained at the facility. Failure to implement and maintain the chosen BMP alternative is a permit violation; see SWPPP.

The facility does not have stormwater discharges or the stormwater outfalls onsite have no industrial exposure.

AREA-WIDE WASTE TREATMENT MANAGEMENT & CONTINUING AUTHORITY:

As per [10 CSR 20-6.010(2)(C)], an applicant may utilize a lower preference continuing authority when a higher level authority is available by submitting information as part of the application to the Department for review and approval, provided it 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 & SEWAGE SLUDGE:

Biosolids are solid materials resulting from domestic wastewater treatment that meet federal and state criteria for beneficial uses (i.e.

fertilizer). Sewage sludge is solids, semi-solids, or liquid residue generated during the treatment of domestic sewage in a treatment works;…