J-1604000-07 MDE STATE DISCHARGE PERMIT.pdf

VIA ELECTRONIC MAIL

Mr. Rodney Miley, Utilities and Energy Management Branch Manager

Naval Support Activity (NSA) Annapolis WWTP

Public Works Department Annapolis – Environmental Division

181 Wainwright Road

Annapolis, MD 21402

RE: Discharge Permit for NSA Annapolis WWTP {located at 107 NS Carr Creek Road, Annapolis, MD 21402}State Discharge Permit 20-DP-2534; NPDES Permit MD0023523

Dear Mr. Miley:

Enclosed is the above discharge permit with the effective date indicated on the cover page. The permittee is responsible for complying with all permit conditions. You are therefore advised to read the permit carefully and become thoroughly familiar with the requirements in order to maintain compliance with the permit.

Your facility has been approved by MDE to electronically submit Discharge Monitoring Report

(DMR) through NetDMR. Therefore you are required to submit monthly DMRs by the 28th of the following month and all other documents as listed in the discharge permit electronically through

NetDMR. Should you encounter problems in electronic submission for any month, please consult the MDE’s Compliance Program by calling at (410) 537-3510 to avoid missing the deadline for submission of the above stated documents.

Also, enclosed please find the following documents for your future reference pertaining to the above discharge permit:

- A copy of the Federal Register published on May 19, 2021, with final rule to update the Code of Federal Regulations (CFR), Title 40, Part 136 - "Guidelines Establishing Test Procedures for the Analysis of Pollutants" which is in effect from July 19, 2021. For future reference, please be advised to visit the U.S Government Publishing Office (USGPO) website https://mdewwp.page.link/40CFR136 (this link is case-sensitive) regularly to obtain updated guidelines. Unless otherwise specified, the most updated guidelines in 40 CFR Part 136 are required to be used for the analyses of pollutants specified in this permit.

- A copy of the table of the Minimum Monitoring Requirements.

Aug 1, 2023

Rodney Miley

- A copy of transmittal cover sheet for the WWTP Effluent Toxic Chemical Monitoring Data.

- A copy of the most updated Department's "Toxic Pollutant Monitoring Protocol and Reporting

Requirements for Toxic Chemical Testing Analytical Data, as amended” which can be downloaded from Department’s website link: https://mdewwp.page.link/Biomonitoring (this link is case-sensitive).

- A copy of the most updated Department’s “Effluent Biotoxicity Testing Protocol for Industrial and Municipal Effluents, as amended” which can be downloaded from the Department's website link: https://mdewwp.page.link/TCT (this link is case-sensitive). on 1/23/2019).

If you have any questions, please contact Mohamed Traore, Project Manager, Surface Discharge

Permits Division, at (410) 537-3634.

Sincerely, D. Lee Currey, Director

Water and Science Administration

Enclosures cc: Ms. Rebecca K. Crane, USEPA (electronic copy)

Mr. Dan Curtain, Director, Environmental Health, Anne Arundel County Health Department

(electronic copy)

Mr. Clay Troy, Central Inspection Division (electronic copy)

Mr. Matt Rowe (electronic copy)

Mr. Dennis Rasmussen (electronic copy)

D I S C H A R G E P E R M I T

Pursuant to the provisions of Title 9 of the Environment Article, Annotated Code of Maryland, and regulations promulgated thereunder, and the provisions of the Clean Water Act, 33 U.S.C. Section 1251 et seq., and implementing regulations 40 CFR Parts 122, 123, 124 and 125, the Department of the

Environment hereby establishes conditions and requirements pertinent to the wastewater treatment plant and collection system and authorizes:

Naval Support Activity (NSA) Annapolis

Public Works Department Annapolis – Environmental Division

181 Wainwright Road

Annapolis, MD 21402

TO DISCHARGE FROM: Naval Support Activity (NSA) Annapolis Wastewater Treatment Plant

LOCATED AT: NSA Annapolis – North Severn

107 NS Carr Creek Road

Annapolis, MD 21402

THROUGH OUTFALL: 001A (WWTP Effluent)

TO: Carr Creek designated as Use II (shellfish harvesting) water, which is protected for estuarine and marine aquatic life, and for shellfish harvesting; in accordance with the following special and general conditions and a map incorporated herein and made a part hereof.

N P D E S D i s c h a r g e

P e r m i t N u m b e r : M D 0 0 2 3 5 2 3

S t a t e D i s c h a r g e

P e r m i t N u m b e r : 2 0 - D P - 2 5 3 4

E f f e c t i v e

D a t e : 0 9 / 0 1 / 2 0 2 3

E x p i r a t i o n

D a t e : 0 8 / 3 1 / 2 0 2 8

M o d i f i c a t i o n

D a t e :

( N o t a p p l i c a b l e )

R e a p p l i c a t i o n D u e

D a t e : 0 8 / 3 1 / 2 0 2 7

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 2 of 43

I . D E F I N I T I O N S

A. “Ambient temperature” of the effluent receiving stream means the water temperature that is not impacted by a point source discharge, and it shall be measured in areas of the stream representative of typical or average conditions of the stream segment in question.

B. “Bypass” means the intentional diversion of pollutants from any portion of a treatment or collection facility.

C. “BOD5 (Biochemical Oxygen Demand)” means the amount of oxygen consumed in a standard BOD5 test without the use of a nitrification inhibitor at 20 degrees centigrade on an unfiltered sample.

D. “Clean Water Act” means the Federal Water Pollution Control Act, as amended, 33

U.S.C. Section 1251 et seq.

E. “CFR” means the Code of Federal Regulations.

F. “COMAR” means the Code of Maryland Regulations.

G. “Department” means the Maryland Department of the Environment (MDE).

H. Discharge Limits

1. “Maximum (or Minimum) daily discharge” limitation means the highest (or lowest) allowable discharge of a pollutant measured during a calendar day (or any

24-hour period) that reasonably represents the calendar day for sampling purposes.

a. For pollutants with limitations expressed in units of mass (e.g., Pounds/day) as a maximum daily average, the “daily discharge” is calculated as the total mass of the pollutant discharged over the day.

b. For pollutants with limitations expressed in other units of measurement

(e.g., concentration) as a maximum (or minimum) daily average, the “daily discharge” is calculated as the average measurement of the pollutant over the day.

2. “Maximum (or minimum) weekly average" limitation means the highest (or lowest) allowable average of "daily discharges'' over a calendar week, calculated as the sum of all "daily discharges'' measured during a calendar week divided by the number of "daily discharges'' measured during that week. Each of the following 7-day periods is defined as a calendar week: Week 1 is Days 1 - 7 of the month;

Week 2 is Days 8 - 14; Week 3 is Days 15 - 21; and Week 4 is Days 22 - 28. For weekly average maximum, if the "daily discharge" on days 29, 30 or 31 exceeds the "weekly average" discharge limitation, MDE may elect to evaluate the last 7 days of the month as Week 4 instead of Days 22 - 28. For weekly average

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 3 of 43 minimum, if the "daily discharge" on days 29, 30 or 31 is lower than the "weekly average" discharge limitation, MDE may elect to evaluate the last 7 days of the month as Week 4 instead of Days 22 - 28.

3. “Maximum (or minimum) monthly average” limitation means the highest (or lowest) allowable monthly average concentration or waste load of a parameter over a calendar month. The monthly average is calculated as the sum of all daily discharges for a parameter sampled and/or measured in that calendar month divided by the number of days on which monitoring was performed.

4. “Maximum (or minimum)” limit means the highest (or lowest) allowable value measured during a calendar day or any 24-hour period that reasonably represents the calendar day for purposes

5. of sampling.

6. “Monthly loading rate (in pounds/month)” means the total load of a parameter calculated for that calendar month. It is calculated using this formula {(monthly average concentration in mg/l) x (Total monthly flow in Million Gallons) x 8.34}.

7. “Year-to-date cumulative load (pounds)” value means cumulative load of a pollutant in the effluent through each reporting month in a calendar year. It is calculated as a sum of the individual total monthly loads from January through the reporting month in a calendar year.

8. “Annual Maximum Loading Rate (in pounds/year)” limit means the maximum load allowed for a pollutant in the effluent to be discharged in a calendar year.

The Year-to-date cumulative load (as defined above in Definition I.H.6) shall be used to determine the compliance status of this requirement.

9. “Monthly log mean (Monthly geometric mean)” limit means the highest allowable value calculated as the logarithmic or geometric mean of all samples taken in the calendar month. The geometric mean is the antilogarithm of the mean of the logarithms.

I. Discharge Monitoring

1. “Composite sample” means a combination of individual samples obtained at hourly or smaller intervals over a time period. Either the volume of each individual sample is proportional to discharge flow rates, or the sampling interval

(for constant volume samples) is proportional to the flow rates over the time period used to produce the composite.

2. “Grab sample” means an individual sample collected over a period of time not exceeding 15 minutes.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 4 of 43

3. “Estimated flow” value means a calculated volume or discharge rate which is based on a technical evaluation of the sources contributing to the discharge including, but not limited to, pump capabilities, water meters, and batch discharge volumes.

4. “Measured flow” value means any method of liquid volume measurement, the accuracy of which has been previously demonstrated in engineering practice, or for which a relationship to absolute volume has been obtained.

5. “Recorded flow” means any method of providing a permanent, continuous record of flow including, but not limited to, circular and strip charts.

6. “Monthly average flow” means the total flow for a calendar month divided by the number of days in the same month.

J. "i-s (immersion stabilization)" means a calibrated device immersed in the effluent or stream, as applicable, until the temperature reading is stabilized.

K. “NetDMR” means a nationally-available electronic reporting tool, initially designed by states and later adapted for national use by EPA, which can be used by NPDES-regulated facilities to submit discharge monitoring reports (DMRs) electronically to EPA through a secure Internet application over the National Environmental Information Exchange

Network (NEIEN). EPA can then share this information with authorized states, tribes, and territories.

L. “NPDES (National Pollutant Discharge Elimination System)” means the national system for issuing permits as designated by the Clean Water Act.

M. “Nondetectable Level” for total residual chlorine means a residual concentration of less than 0.10 mg/l as determined using either the DPD titrimetric or chlorimetric method or an alternative method approved by the Department.

N. “Outfall” means the location where the effluent is discharged into the receiving waters.

O. “Overflow” means any loss of wastewater or discharge from a sanitary sewer system, combined sewer system or wastewater treatment plant bypass (as defined in I.B) which results in the direct or potential discharge of raw, partially treated wastewater into the waters of the State.

P. “Performance-based benchmark load” means a wastewater point source annual effluent load which is calculated at the end of each calendar year using the end of the calendar year annual cumulative flow for the facility, multiplied by the applicable assigned nitrogen, phosphorus or Total Suspended Solids (TSS) performance concentration converted to units of pounds per year, where a sewage treatment facility has an

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 5 of 43 assigned performance consideration: (a) for total nitrogen, 3.0 mg/l or less; (b) for total phosphorus, 0.3 mg/l or less; or (c) for TSS, 30 mg/l or less.

Q. “Performance-based Credit load” means a unit of load reduction below performance-based benchmark load of one pound of nitrogen, phosphorus, or sediment. The performance-based credit load shall be calculated and reported under the terms of the required wastewater discharge permit at the end of each calendar year as the load remaining after subtracting actual annual effluent nutrient or TSS load discharged from the performance-based benchmark load.

R. “Permittee” means an individual or organization holding the discharge permit issued by the Department.

S. “POTW” means a publicly owned treatment works.

T. “Sampling Point” means the effluent sampling location in the outfall line(s) downstream from the last addition point or as otherwise specified.

U. “Sanitary Sewer Overflow (SSO)” means a discharge of untreated or partially treated sewage from a separate sewer system before the sanitary wastewater reaches the headworks of a wastewater treatment facility, pursuant to COMAR 26.08.10.01.

V. “Secondary Treatment” means the treatment of sewage to produce effluent equal to or better than the following quality, except as provided for 40 CFR §133.103, or 40 CFR

§133.105

1. Five-day biochemical oxygen demand (BOD5):

a. 30 milligrams/liter—average for a 30-day period;

b. 45 milligrams/liter—average for a 7-day period;

c. The 30-day average percent removal shall not be less than 85 percent.

2. Total Suspended Solids (TSS):

a. 30 milligrams/liter—average for a 30-day period,

b. 45 milligrams/liter—average for a 7-day period;

c. The 30-day average percent removal shall not be less than 85 percent.

3. Bacterial control: As required to meet water quality standards.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 6 of 43

W. “Significant Industrial User (SIU)” is defined as any industrial user (IU) that:

1. is subject to national categorical standards; and

2. any other IU that:

a. discharges an average of 25,000 gallons per day or more of process wastewater (excluding sanitary, non-contact cooling and boiler blowdown wastewater); or

b. contributes a process wastestream that makes up 5% or more of the average dry weather hydraulic or organic capacity of the POTW; or

c. is designated as such by the POTW on the basis that the IU has a reasonable potential for adversely affecting the POTW's operation or for violating any pretreatment standard or requirement; or

d. is found by the POTW, the Department, or the Environmental Protection

Agency (EPA) to have significant impact either individually or in combination with other contributing industries to the POTW, on the quality of the sludge, the POTW's effluent quality, or air emissions generated by the system.

X. “TKN (Total Kjeldahl Nitrogen)” means organic nitrogen plus ammonia nitrogen.

Y. “TSS (Total Suspended Solids)” means the residue retained on the filter by an analysis done in accordance with Standard Methods or other approved methods.

Z. “Upset” means the exceptional incident in which there is unintentional and temporary noncompliance with technology-based permit effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 7 of 43

I I . S P E C I A L C O N D I T I O N S

A. Effluent Limitations, Outfall 001A (1) (2) (3) (4)

The quality of the effluent discharged by the facility at a discharge point location

(Outfall 001A) shall be limited at all times as shown below:

Effluent Characteristics

Maximum Effluent Limits, except as noted Monthly

Average Loading

Rate, Weekly

Average Loading Rate, Daily

Average Loading Rate, Monthly Average

Concentration, Weekly Average

Concentration, Daily Average

Concentration, Pounds/day Pounds/day Pounds/day mg/l mg/l mg/l

BOD5 50

N/A

BOD5, Percent Removal (9) 85 % minimum monthly average

TSS 25 37 N/A 10 15 N/A

TSS, Percent Removal (9) 85 % minimum monthly average

Effluent Characteristics

Maximum Effluent Limits

Total Monthly

Loading Rate, Annual Maximum

Loading Rate, Monthly Average

Concentration, Pounds/Month Pounds/Year mg/l

TSS (4) REPORT 9,132

TP as P (5) (6) (7) REPORT 274 REPORT

Total Nitrogen (TN) as N (5) (6) (7) REPORT 3,653 REPORT

Effluent Characteristics

Effluent Limits

Maximum Minimum

Fecal Coliform 14 MPN/100 ml monthly median value N/A

Total Residual Chlorine (8) Nondetectable level (See footnote- 8) N/A pH 8.5 6.5

Dissolved Oxygen (All Year)

(2/1 – 5/31)

5.0 mg/l at anytime

6.0 mg/l weekly average

An annual average flow of 0.3 million gallons per day (mgd) was used in waste allocation calculations (expressed as waste loading rate limit), and this unit shall be used when reporting on the Discharge Monitoring Report (DMR) as required by General Condition III.A.2. Notification is to be provided to the Department at least 180 days before the annual average flow is expected to exceed this flow level. If a permit modification is required, the Department will initiate the public participation NPDES process.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 8 of 43

Footnotes for Special Condition II.A for Effluent Limitations :

(1) When this permit is renewed, the new limitations may not be equal to the above limitations.

(2) There shall be no discharge of floating solids or visible foam other than trace amounts.

(3) The permit may also be reopened in accordance with the requirements of MDE's Watershed Permitting

Plan under which all discharge permits in a watershed are issued the same year.

(4) The Severn River Mesohaline (SEVMH) watershed is on the 303(d) list as the impaired waters for nutrients, sediments, fecal coliform, Fish and Benthic IBIs, Benthic IBI, Temperature, and PCBs in Fish

Tissue. A fecal coliform Total Maximum Daily Load (TMDL) for the Severn River watershed, was approved by the EPA on 4/10/2008. A fecal coliform waste load allocation (WLA) of 5.30 x 108 counts per day was allocated to this facility, and the parameter limits are in conformance with this TMDL. This permit is in conformance with the “Chesapeake Bay TMDL for Nitrogen, Phosphorus and Sediment” established on December 29, 2010, and Maryland’s Phase II WIP (Appendix F – Final Target Loads for

Significant Facilities).

When TMDLs for other remaining parameters are completed, limits may be imposed, after the public participation process, to incorporate any TMDL requirements.

(5) The permittee shall operate the ENR facility in a manner that optimizes the nutrient removal capability of the facility. The first exceedance of the permit limit shall be counted and reported as daily exceedances beginning from the first exceedance, determined to the nearest day, through December 31. In addition, after any such exceedance, the permittee shall demonstrate to the Department's satisfaction that the facility is optimizing its nutrient removal capability, and neither the arrival of the next calendar year nor the issuance of a permit renewal during a period of noncompliance shall obviate continuance of any noncompliance status related to treatment optimization requirements.

(6) At the end of each calendar year, the permittee shall comply with the concentration-based limitations for the Annual Maximum Loading Rate defined below or the Chesapeake Bay TMDL based annual maximum loading rate limitations listed in above in the effluent limitations table, whichever is lower:

(a) TN Limitation (lbs./year): 4.0 mg/l x annual total flow (calendar year based in million gallons per year) x 8.34. To the extent that the permittee alleges that temperature levels of 12 degrees C or lower have diminished the treatment system’s capability of complying with this concentration-based loading rate limitation for Total Nitrogen, the permittee shall provide notification beginning with the calendar year report under the “Upset” provision in Section

III.B.6 of this permit. In any enforcement proceeding, the permittee seeking to establish the occurrence of an upset has the burden of proof.

(b) TP Limitation (lbs./year): 0.30 mg/l x annual total flow (calendar year based in million gallons per year) x 8.34.

The details and results of all required annual calculations shall be submitted to the Department with the

Discharge Monitoring Report for December. See Special Condition II.K for further details.

The concentration-based loading requirements may be revised if the limits or schedule are determined to be impracticable based on actual performance and the Department re-opens the permit as a major modification (which requires public participation) to impose (an) alternate effluent limitation(s) or revised schedule.

(7) The permittee may request that the permit be reopened and modified to include nutrient trading consistent with all applicable regulations and requirements in effect at that time.

(8) Total residual chlorine limitation of the nondetectable level shall be applicable, when chlorine or any chlorine-containing compound is used in any treatment process(es), including but not limited to disinfection, that could become a potential constituent of the effluent discharged from the NSA Annapolis

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 9 of 43

WWTP. The wastewater shall be dechlorinated to reduce effluent total residual chlorine concentration to the nondetectable level (See definition I.M).

(9) In accordance with 40CFR §133.102, the 30-day average percent removal for BOD5 and TSS shall not be less than 85 (eighty-five) percent as the minimum level of effluent quality attainable by the secondary treatment. Refer to the footnotes 28 and 29 for further details for calculations and reporting requirements toward compliance to the BOD5 and TSS percent removal effluent limitations (See Definition I.V).

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 10 of 43

B. (1). Minimum Monitoring Requirements:

(a) Regular Monitoring and Reporting Schedule

The effluent characteristics listed below in Table B(1) shall be monitored at the sampling point (Definition I.R) located at {LONGITUDE: 75° 27’ 29” (W) and

LATITUDE: 38° 58’ 50” (N). The permittee shall ensure that the effluent samples taken at the above stated sampling point are representative of the effluent quality discharged at the Outfall 001A.

Effluent Characteristics Monitoring Period Measurement Frequency Sample Type

BOD5

(10)(19)(20)(21) All Year Two per week 24-hour composite *

Total Suspended Solids (TSS) (10)(19)(20)(21) All Year Two per week 24-hour composite *

BOD5, Percent Removal (10)(20)(21) All Year One per year Calculated

TSS, Percent Removal (10)(20)(21) All Year One per year Calculated

TKN (10)(11)(19) All Year Two per week 24-hour composite *

Total Ammonia Nitrogen as N (10)(11)(12)(19) All Year Two per week 24-hour composite *

(Nitrite + Nitrate) as N (10)(11)(12)(19) All Year Two per week 24-hour composite *

Organic Nitrogen as N (10)(11)(12)(19) All Year Two per week Calculated

Total Nitrogen as N (10)(12)(13)(19) All Year Two per week Calculated

Total Phosphorus as P (10)(13)(19)

All Year Two per week 24-hour composite *

Orthophosphate as P (10)(11)(19) All Year Two per week 24-hour composite *

Fecal Coliform (10) All Year One per week Grab

Total Residual Chlorine (10)(14)(15) All Year Two per day Grab

Dissolved Oxygen (10)(15) All Year Two per day Grab pH (10)(15) All Year Two per day Grab

Flow (10)(16)(17) All Year Continuous Recorded (17)

Total Flow (10)(18) All Year Monthly Calculated (18)

* The permittee shall conduct the flow-proportional composite monitoring at all times unless receiving approval from the Department for the time-proportional composite monitoring. The time -proportional composite sampling may be approved when the permittee demonstrates the wastewater flow of the sampled stream is constant (i.e., the flow rates measured do not vary more than ±10 percent of the average flow rate over the sampling period).

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 11 of 43

Effluent Characteristics Monitoring Period Measurement Frequency Sample Type

B. (1) (b) For Raw Wastewater Influent at Sampling Point 101A:

The quality of the wastewater influent entering the Naval Support Activity Annapolis

WWTP shall be monitored at Influent Chamber (LONGITUDE: 76° 27’ 39” (W) /

LATITUDE: 38° 59’ 20” (N))all the time as shown below:

Wastewater Influent Characteristics Monitoring Period Measurement Frequency * Sample Type

BOD5

(10)(11)(20)(21) All Year One per year Grab

Total Suspended Solids (10)(11)(20)(21) All Year One per year Grab

* The monitoring frequency to determine BOD5/TSS removal efficiency (in percentage) will be on an annual basis. The permittee shall select a calendar month and a minimum of one day (in that calendar month) in each calendar year to collect samples from the influent and effluent to calculate the removal efficiency. The permittee may take additional samples of BOD5 and TSS in the influent on different days within the selected calendar month. All the sampling results for this requirement shall be reported in the Monthly Operating

Report (MOR) for the same calendar month.

For the compliance determination of the percent removal requirement, the individual results of BOD5/TSS in the influent and effluent collected on the same day must be incorporated to calculate the monthly average concentrations of the specific parameter in the influent and effluent. (Example: If the influent samples are collected for multiple days in a calendar month, the effluent sampling results from the same corresponding days must be used to calculate the monthly average concentrations and to report the percent (%) removed as a minimum monthly average for the same calendar month and reported in the month of December

Discharge Monitoring Report (DMR) as well to fulfill the annual monitoring requirement).

These monthly average concentrations shall be applied to calculate the percent removal efficiency using formula listed in the footnote 22, and the results of the percent removal shall be reported on the December month’s DMR at the end of each calendar year. The permittee shall also prepare and submit a report as a copy of record (COR) along with the December month’s NetDMR. The COR shall provide details, including but not limited to, name of facility, sampling time (day(s), month, and year), individual results as well as monthly average concentrations of influent and effluent, laboratory sheets and pertinent information for analytes, and results of the percent removal calculation results.

B (1) (c) Nutrient and Sediment Performance-based Credit Reporting Schedule

Under COMAR 26.08.11, Maryland Water Quality Trading Program, the permittee is authorized to generate nutrient and sediment credits for trading to industrial and municipal stormwater permit holders. For each calendar month, the permittee shall calculate and report on the monthly DMR the effluent related nutrient (Total Nitrogen and Total Phosphorus) and sediment (TSS) performance-based benchmark loads (Definition I.P) and performance-based credits (Definition I.Q) as listed below.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 12 of 43

If the permittee seeks to trade the reported credit, the permittee shall also submit information related to the generation of annual performance-based credit on the

“Credit Verification and Registration Form for Wastewater Point Source” provided by the Department. The completed form shall be sent to the

Department’s Water and Science Administration Trading Administrator by the end of each January to report credits generated during the prior calendar year.

The Permittee shall report the below listed the performance-based benchmark load and performance-based credit load on the monthly DMR using the discharge designation "TRAD-E".

Effluent Characteristics Monitoring Period Measurement Frequency Sample Type

TSS (10)(22)(23)

(Performance-based Benchmark Load)

All Year

One per month

Calculated

TSS (10)(22)(23)

(Performance-based Credit)

Total Nitrogen as N (10)(22)(23)

Total Nitrogen as N (10)(22)(23)

Total Phosphorus as P (10)(22)(23)

Total Phosphorus as P (10)(22)(23)

Flow Year-to-date (YTD) Total (10)(24) All Year One per month Calculated

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 13 of 43

B. (1) Minimum Monitoring Requirements, continued:

Footnotes for Special Condition II.B(1) for Minimum Monitoring Requirements :

(10) "STORET" (short for STOrage and RETrieval) is a widely-used repository for water quality data reporting and monitoring. The STORET codes for the effluent characteristics described as limitations and/or monitoring requirements are: BOD5 (00310), BOD5 percent removal (81010), Total Suspended

Solids (00530), Total Suspended Solids percent removal (81011), TKN (00625), Total Ammonia

Nitrogen as N (00610), Total Phosphorus as P (00665), Total Nitrogen as N (00600), (Nitrite + Nitrate) as N (00630), Organic Nitrogen as N (00605), Orthophosphate as P (04175), Fecal Coliform (74055), Total Residual Chlorine (50060), Dissolved Oxygen (00300), pH (00400), Flow (50050), Total flow

(82220), Sediment as TSS Performance-based Benchmark Load (00530(P)), TSS Performance-based

Credit (00530(Q)), Total Nitrogen Performance-based Benchmark Load (00600(P)), Total Nitrogen

Performance-based Credit (00600(Q)), Total Phosphorus Performance-based Benchmark Load

(00665(P)), Total Phosphorus Performance-based Credit (00665(Q)) and Flow YTD Total (74076(R)).

(11) This parameter (without effluent limitations) must be monitored, and it shall be reported on the Monthly

Operating Report (MOR) as individual results and on the Discharge Monitoring Report as monthly average concentrations.

(12) Total nitrogen as N (in mg/l) is a calculated parameter as the sum of individual results for total ammonia nitrogen as N, organic nitrogen as N and (nitrite + nitrate) as N. Total Kjeldahl Nitrogen (TKN) is defined as the total concentration of organic nitrogen and ammonia as N. All nitrogen species must be sampled at the same day. The monitoring result for organic nitrogen may be calculated through the subtraction of the total Ammonia as N monitoring result from the result of TKN sample taken at the same day.

(13) The permittee shall also calculate and report on the DMR the TN, TP, and TSS total monthly loads

(Definition I.H.5) plus year-to-date cumulative loads (Definition I.H.6) for the calendar year in question for the outfall- 001A.

For each calendar year beginning, the year-to-date cumulative loads of TN and TP for the month of

December shall represent the total annual loads, and they must be incorporated toward complying with the respective annual maximum load limits. Refer to Special Condition II.K for “Reporting TN and TP total annual loads for compliance to the Concentration-based maximum annual loading rate limits”.

(14) The Minimum monitoring requirements of two per day-grab samplings for total residual chlorine shall be applicable, when chlorine or any chlorine compound is used in any treatment process(es), including but not limited to disinfection, that could become a potential constituent of the effluent discharged from the NSA Annapolis WWTP. The minimum level (quantification level) for total residual chlorine is 0.10 mg/l.

The permittee may report all results below the minimum level as <0.10 mg/l. All results reported below the minimum level shall be considered in compliance.

(15) Samples for these parameters (total residual chlorine, pH and dissolved oxygen) shall be taken at intervals evenly distributed throughout the staffed period each day to comply with the General Condition III.A for the representative sampling requirements.

(16) Flows shall be reported in million gallons per day (mgd) to at least the nearest 10,000 gallons per day.

(Example: A flow of 1,524,699 gallons per day shall be reported as 1.53 mgd.). For each calendar month, flows shall be reported on the MOR as daily individual results and on the DMR as monthly average (mgd) and daily maximum (mgd).

(17) Continuous electronic flow measurement and recording which can produce a permanent record are acceptable to the Department.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 14 of 43

(18) “Total flow” is a calculated parameter equal to sum of the daily flow results in a calendar month. It shall be reported on the monthly DMR as Total monthly flow in million gallons (MG) to at least the nearest

10,000 gallons. (Example: A flow of 1,524,699 gallons shall be reported as 1.53 MG).

(19) The permittee shall distribute the timing for effluent sampling with (a) minimum of 48-hour apart for two per week monitoring frequencies. The 48 hours interval for two per week sampling shall be defined as the period between the starting times of the two consecutive effluent sample collections for the same effluent parameter.

(20) Wastewater influent samples for BOD5 and TSS shall be collected per the sampling type and reporting frequency specified in above (Special Condition II.B(1)(b), page 11). These measurements shall be utilized to calculate BOD5 and TSS percent removed using the formula listed below in footnote 21 and results shall be used to comply with the Percent removal effluent limits of BOD5 and TSS (Special

Condition II.A above). Any effluent excursion of the percent removal limit (Special Condition II.A, Page

7) reported at the end of each monitoring period will be considered as violation for the full period as specified.

(21) At the end of each reporting period, the permittee shall incorporate BOD5 and TSS monthly average concentrations in the influent and effluent (both reported on a monthly DMR for the calendar month of the influent sampling), and calculate monthly percent (%) of a parameter (BOD5 or TSS) removed using the following formula:

𝑀𝑜𝑛𝑡ℎ𝑙𝑦 𝐴𝑣𝑒𝑟𝑎𝑔𝑒 𝑃𝑒𝑟𝑐𝑒𝑛𝑡 (%) 𝑜𝑓 𝑃𝑎𝑟𝑎𝑚𝑒𝑡𝑒𝑟 𝑅𝑒𝑚𝑜𝑣𝑒𝑑 = { (𝐴 − 𝐵)

𝐴 } × 100

Where:

A = Monthly Average Concentration of Parameter in Influent, mg/l

B = Monthly Average Concentration of Parameter in Effluent, mg/l

The results (monthly average percent (%) of BOD5 and TSS removed) shall be reported in the DMR submitted for the last calendar month of the reporting period. (Example: If the monitoring frequency of the percent (%) removal is one per quarter, the results shall be reported in the DMRs for March, June, September, and December).

(22) Nutrient and Sediment Performance-Based “Benchmark Loads”:

At the end of each month, a year-to-date cumulative nutrient and sediment (as total nitrogen, total phosphorus and total suspended solids in the effluent) performance-based “benchmark load” for this facility shall be calculated and reported on monthly DMR using the formulas listed below:

(a) For TN:

Year-to-date cumulative Performance-Based Benchmark Load for TN (pounds)

= 3.0 mg/L* × 8.34 × Flow YTD Total (million gallons/year).

(b) For TP:

Year-to-date cumulative Performance-Based Benchmark Load for TP (pounds)

= 0.30 mg/L* × 8.34 × Flow YTD Total (million gallons/year).

(c) For Sediment:

Year-to-date cumulative Performance-Based Benchmark Load for Sediment (pounds)

= 30 mg/L *× 8.34 × Flow YTD Total (million gallons/year).

*Or any more stringent effluent concentration-based limit required in the discharge permit.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 15 of 43

(23) Nutrient and TSS “Performance-Based Credit”

At the end of each month, the facility shall subtract the year-to-date nutrient and sediment cumulative loads (as defined in I.H.5 & I.H.6 in this permit) from the year-to-date nutrient and sediment performance-based benchmark loads (stated above in footnote 22) and report the result as year-to-date

“performance-based credit” on the monthly DMR. The “performance-based credit” generated by the facility at the end of each calendar year may be eligible for trading activities authorized by COMAR

26.08.11.

(24) Flow YTD Total is calculated and reported in million gallons per year as the sum of total flows (stated above in footnote 18) for a period from January 1st through the reporting month.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 16 of 43

B(2) Report Submittal Requirements

No. Report Description Reporting Frequency Report Submittal Deadline

1. Effluent Biomonitoring Study Plan and

Toxic Chemical Testing Plan (25)(26) See footnote - 26 See footnote – 26

2. Effluent Biomonitoring Study Report

(25)(27)(29) See footnotes-27 & 39 See footnote- 29

3. Effluent Toxic Chemical Testing Report

(26)(29)(30) See footnotes – 28 & 29 See footnote- 29

4 Per- and Polyfluorinated Alkyl

Substances (PFAS) Study Plan and

Report See footnote - 30 See footnote- 30

(25) If the permittee has selected a third party for submitting reports to the Department, the permittee must provide to the third party with a document of authorization for report submission which is required with the report.

(26) Within three months from the effective date of this permit, the permittee shall submit the Study Plans for effluent biomonitoring as well as toxic chemical testing and obtain approval from the Department. For further details, refer to Special Condition II.D.1 for Effluent Biomonitoring Study Plan and Special

Condition II.F.1 for Effluent Toxic Chemical Testing Study Plan.

(27) After MDE’s approval of the Effluent Biomonitoring Study Plan, the permittee shall perform the effluent biomonitoing study and submit the results in a comprehensive report to the Department as per requirements of the Special Condition II.D.

(28) After MDE’s approval of the Effluent Toxic Chemical Testing Plan, the permittee shall perform the effluent toxic chemical testing and submit the results in a comprehensive report to the Department as per requirements of the Special Condition II.F.

(29) The reports (a) for each biomonitoring study test performed as per the Special Condition II.D.2 and (b) for each analytical testing for toxic chemicals performed as per Special Condition II.F.3 shall be submitted to the Department by a mail or attached and submitted to the Department along with DMR for the month during which the test was completed, using NetDMR tool no later than 28th of the month following the test completion month. (Example: If the test is completed in March, the comprehensive report shall be submitted with the March DMR no later than 28th April).

(30) Within three months from the effective date of this permit, the permittee shall submit the Study Plans for

PFAS monitoring and obtain approval from the Department. Upon approval, the permittee shall perform three (3) consecutive quarterly PFAS monitoring within a 12-month period and submit results in a comprehensive report to the Department as per requirements of the Special Condition II.M.

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 17 of 43

C. Wastewater Capacity Management

The permittee shall report the total cumulative flow for each calendar year for the above referenced facility. The total cumulative flow shall be reported in million gallons for the entire calendar year to the nearest ten thousand gallons, and it shall represent the total wastewater flow processed through the treatment processes daily. The annual total cumulative flow determination shall be provided to the Department using NetDMR no later than January 28th of the following year. The permittee shall also determine the cumulative number of the discharge days observed and report along with the annual cumulative flow using the NetDMR.

At the end of each calendar year, if it is determined that the facility’s most recent three-year average flow has exceeded the 80% of the current design capacity or if the exceedance is anticipated to occur by the end of the following year, the permittee shall comply with the following requirements:

1. Wastewater Capacity Management Plan (WCMP): The permittee shall submit the WCMP to the Department, using NetDMR, by March 31st of the first year and by January 28th thereafter for each calendar year. The permittee can obtain the WCMP guidance document from the Department’s website link:

http://9nl.at/MD-CMPGuidance (this weblink is case-sensitive). The WCMP report shall provide all the flow management detailed information, including but not limited to the following categories: (a) Inflow/Infiltration (I/I) flow reduction strategy; (b) Utilization of the wastewater flow equalization facilities, if available; (c) Inspection and evaluation of the wastewater collection system; (d)

Present population and future growth in the residential, commercial and industrial sectors located within the service areas; (e) Occurrences of the wastewater overflows and plant upsets due to extraneous wastewater flows, and any reasonable corrective actions taken as a preventive measure; and (f) Use of

Best Management Practices (BMPs) to address flow spikes resulted from the extreme weather conditions.

2. Municipal Sewage Flow Capacity Report (MSFCR): The permittee shall also submit the MSFCR and its Worksheet (Style # 1 or Style #2) along with the

WCMP for each calendar year to the Department using the NetDMR tool no later than January 28th of the following year. The permittee can obtain the

WCMP guidance document and forms from the Department’s website links listed below: (a) http://9nl.at/MD-CMPFlowCapReport for MSFCR, (b) http://9nl.at/MD-CMPWorksheet1 for MSFCR’s Worksheet # 1, and (c) http://9nl.at/MD-CMPWorksheet2 for MSFCR’s Worksheet # 2 (these links are case-sensitive).

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 18 of 43

If the permittee prefers to provide the above documents in hard copies, they shall be provided to the Department postmarked by January 28th of the following year, except as noted above, to the address below:

Attention: Calendar Year Total Cumulative Flow

Wastewater Discharge Permits Program

Water and Science Administration (WSA)

Maryland Department of the Environment

1800 Washington Boulevard, STE-455

Baltimore, MD 21230-1708

The permittee is advised to notify the Department at the above address immediately upon electronic submission of reports through NetDMR tool.

D. Biomonitoring Program

Within three months of the effective date of the permit, the permittee shall submit to the

Department for approval a study plan to evaluate wastewater whole effluent toxicity

(WET) at Outfall 001A using the biomonitoring results. The study plan shall include a discussion of:

a. wastewater and production variability

b. sampling & sample handling

c. source & age of test organisms

d. source of dilution water

e. testing procedures/experimental design

f. data analysis

g. quality control/quality assurance

h. report preparation

i. testing schedule

2. The testing program shall consist of two definitive acute testing events, three months apart. This testing shall be initiated no later than three months following the Department's acceptance of the study plan. If results from any of the required tests suggest toxicity in the effluent, the permittee shall repeat the required test within 60 days as a follow-up test. If toxicity is observed from the results of the

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 19 of 43 follow-up test, the permittee shall be subject to the requirements specified in

Section 10 below of this Special Condition.

a. Each of the two testing events shall include a 48-hour static renewal test using fathead minnow and a 48-hour static renewal test using a daphnid species.

b. The permittee may substitute 48-hour static renewal tests using either sheepshead minnows (Cyprinodon variegatus ), silversides (Menidia beryllina , Menidia menidia, Menidia peninsulae) and mysid shrimp

(Americamysis bahia A.K.A. Mysidopsis bahia) for the above tests.

Testing must include one vertebrate species and one invertebrate species

c. Test results shall be expressed as LC50

3. The samples used for biomonitoring shall be collected at the same time and location as the samples analyzed for the effluent limitations and monitoring requirements for this outfall. For chlorinated effluents, samples shall be collected after dechlorination. The permittee shall collect 24-hour flow– proportioned composite samples unless the Department has given prior approval of an alternative sampling type.

4. Testing shall be conducted in accordance with the procedures described in

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to

Freshwater and Marine Organisms, Fifth Edition, EPA-821-R-02-012, October

5. Test results shall be submitted to the Department within one month of completion of each set of tests.

6. Test results shall be reported following the latest update of the Department’s

“Effluent Biotoxicity Testing Protocol for Industrial and Municipal Effluents, Appendix E (Reporting Requirements for Effluent Biomonitoring Data), as amended” which can be downloaded from Department’s website link:

https://mdewwp.page.link/Biomonitoring (this link is case-sensitive).

7. If testing is not performed in accordance with MDE-approved study plan, additional testing may be required by the Department.

8. If the test results of any two consecutive valid toxicity tests conducted within any 12-month period show acute toxicity (LC50 equal to or less than 100%), the permittee shall repeat the test within 30 days to confirm the findings of acute toxicity. If acute toxicity is confirmed, the permittee shall:

a. Eliminate the source of toxicity through operational changes as soon as

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 20 of 43 possible but in any case, not longer than within three months, or

b. Perform a TRE. If the permittee repeats the toxicity testing as stated above and the results of the repeat test do not confirm the acute toxicity, the Department will require the permittee to repeat the toxicity testing as stated above to reconfirm a finding of no acute toxicity. After reconfirmation, the permittee shall complete any remaining quarterly testing required.

9. If the permittee completes a TRE in accordance with II.D.8.b and unacceptable toxicity is confirmed, a Whole Effluent Toxicity (WET) permit limit and a compliance schedule will be required.

10. To address federal NPDES requirements for WET testing and limits, MDE shall implement permit limits in a new or renewal permit when a WET test result shows reasonable potential for toxicity unless it can be demonstrated that the source of toxicity has been eliminated, inappropriate test procedures were utilized, or the source has been controlled via a chemical specific permit limitation. Where reasonable potential has been assumed based on one test result, the permit shall include a WET limit effective within three years unless the effluent shows no toxicity in six follow-up quarterly tests. The permit may be modified to remove the WET limit if the six follow-up quarterly tests show no toxicity.

11. If plant processes or operations change so that there is a significant change in the nature of the wastewater, the Department may require the permittee to conduct a new set of tests.

12 If a significant industrial user locates within the service area so that significant change in the nature of the wastewater might be anticipated, MDE may require the permittee to conduct a new set of tests.

13. The biomonitoring program study plan, WET test results and related materials shall be submitted electronically to the Department if the permittee has already been approved for the NetDMR tool. The material shall be attached as separate single files and labeled as “Biomonitoring Program Study Plan” and “WET Test

Results” in the NetDMR tool. Otherwise, the permittee shall submit all pertinent physical documents to:

Attention: Whole Effluent Toxicity Coordinator

Compliance Program

Water and Science Administration

Maryland Department of the Environment

Montgomery Park Business Center

1800 Washington Boulevard, Suite 420, Baltimore, MD 21230-1708

Permit No. 20-DP-2534 (NPDES MD0023523) Page No. 21 of 43

The permittee shall notify the Department at the above address or via email at mde.biomonitoring@maryland.gov immediately upon electronic submission of the biomonitoring program study plan, WET test results and associated material through NetDMR tool.

E. Toxicity Reduction Evaluation (TRE)

The permittee shall conduct a Toxicity Reduction Evaluation (TRE) when a review of toxicity test data by the Department indicates unacceptable acute or chronic effluent toxicity. A TRE is an investigation conducted to identify the causative agents of effluent toxicity, isolate the source(s), determine the effectiveness of control options, implement the necessary control measures and then confirm the reduction in toxicity.

1. Within 90 days of notification by the Department that a TRE is required, the permittee shall submit for approval by the Department a plan of study, schedule and completion date for conducting a TRE. The permittee shall conduct the

TRE study consistent with the submitted plan and schedule.

2. This plan shall follow the framework presented in Toxicity Reduction

Evaluation Guidance for Municipal Wastewater Treatment Plants (EPA/833B-

99/002) August 1999.

Additional Guidance documents on the TRE process are shown below:

- Methods for Aquatic Toxicity Identification Evaluations Phase I Toxicity

Characterization Procedures Second Edition United States Environmental

Protection Agency Office of Research and Development, Washington, DC

20460, EPA/600/6-9 l/003 February 1991

- Methods for Aquatic Toxicity Identification Evaluations Phase II Toxicity

Identification Procedures for Samples Exhibiting Acute and Chronic

Toxicity, United States Environmental Protection Agency Office of

Research and Development, Washington, DC 20460, EPA/600/R-92/080

September 1993

- Methods for Aquatic Toxicity Identification Evaluations Phase III Toxicity

Confirmation Procedures for Samples Exhibiting Acute and Chronic

Toxicity, United States Environmental Protection Agency Office of

Research and Development, Washington, DC 20460, EPA /600/R-92/08 1

September 1993

- Clarifications Regarding Toxicity Reduction and Identification Evaluations in the National Pollutant Discharge Elimination System Program, March 27, 2001, U.S. Environmental Protection Agency, Office of Wastewater

Management,…