ML22132A121

Reporting Related to National Pollutant Discharge Elimination System Permits and State Certifications

ML22132A121
Person / Time
Site:	Summer
Issue date:	04/12/2022
From:	Lippard G Dominion Energy South Carolina
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
22-161
Download: ML22132A121 (33)

Text

V.C. Summer Nuclear Station Bradham Blvd & Hwy 215. Jenki nsville. SC 29065 Mailing Address:

P.O. Box 88, Jenkinsville, SC 29065 Dominion Energy.com Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 April 12, 2022 DOMINION ENERGY SOUTH CAROLINA, INC. (DESC)

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1

~

Dominion

iiiiiii" Energy Serial No.

22-161 VCS-LIC/TS RO Docket No. 50-395 License No. NPF-12 REPORTING RELATED TO NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMITS AND STATE CERTIFICATIONS DESC hereby submits a copy of the South Carolina Department of Health and Environmental Control (SCDHEC) Consent Order 22-024-W for NPDES Permit SCG646072 in accordance with VCSNS Operating License Appendix B Section 3.2, Reporting Related to the NPDES Permits and State Certifications. Consent Order 22-024-W covers the violation for not performing Total Residual Chlorine (TRC) analyses by a certified laboratory. The notice of violation for not performing TRC analyses by a certified laboratory as required by South Carolina laboratory certification regulations was provided to the Nuclear Regulatory Commission in a letter dated January 20, 2022 (ML22020A416).

In addition, DESC is providing copies of environmental violations concerning permit limits for NPDES Permits SC0030856 and SCG646072. The violations for NPDES Permit SC0030856 were reported to the SCDHEC via electronic Discharge Monitoring Reports (DMRs) for permit exceedances of the pH Instantaneous Maximum in December 2021 and the Total Suspended Solids Monthly Average in March 2022. The violations for NPDES Permit SCG646072 were reported to SCDHEC via electronic DMRs for permit exceedances of TRC Monthly Average and Daily Maximum in January 2022. The notice of violation for the January 2022 TRC permit exceedances is also included in this submittal.

Should you have any questions, please call Mr. Michael Moore at (803) 345-4752.

Sincerely,

~

pa;d Site Vice President V.C. Summer Nuclear Station Enclosures Commitments contained in this letter

None cc:

G. J. Lindamood - Santee Cooper L. Dudes-NRC Region II G. Miller-NRC Project Mgr.

NRC Resident Inspector

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) Unit 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 Enclosures Consent Order 22-024-W Serial No.22-161 Enclosures Page 1 of 32 Permit Number SC0030856 Discharge Monitoring Report DMR Period 12/1/2021 -12/31/2021 Permit Number SC0030856 Discharge Monitoring Report DMR Period 3/1/2022-3/31/2022 Permit Number SCG646072 Discharge Monitoring Report DMR Period 1/1/2022 -1/31/2022 Notice of Violation Al-0005261 Permit Number SCG646072 v2.1

Healthy People. Healthy Communities.

April 21, 2022 FIRST CLASS and CERTIFIED MAIL - 9214 8969 0099 9790 14214650 48 Mr. George Lippard, VC Summer Site Vice President VC Summer Nuclear Station Off-Site Water System PO Box 88, Mail Code 800 Jenkinsville, SC 29065 Re:

Consent Order 22-024-W VC Summer Nuclear Station Off-Site Water System NPDES Permit SCG646072 Fairfield County

Dear Mr. George Lippard:

Enclosed, please find fully executed Consent Order 22-024-W for the above referenced facility.

The Order is considered executed on April 21, 2022.

If you have any questions, please contact me at (803) 898-4262 or by e-mail at taylorhe@dhec.sc.gov.

Sincerely, Harold Taylor Ill, Enforcement Officer Bureau of Water - WP Control Division WP Compliance and Enforcement Section cc:

Jacob Oblander, SCDHEC, WP Compliance Kristian Tucker, SCDHEC, WP Compliance SCDHEC Midlands Regional EQC Office Kayse Jarman, SCDHEC, Water Facilities Permitting Adam Cannon, SCDHEC, WP Enforcement Manager Attachment as stated S.C. Department of Health and Environmental Control 2600 £3..ill Street olL1m 1 J '>

2 J2C

THE STATE OF SOUTH CAROLINA BEFORE THE DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL IN RE: DOMINION ENERGY SC, INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM FAIRFIELD COUNTY CONSENT ORDER 22-024-1 The South Carolina Department of Health and.Environmental Control (Department) and Dominion Energy SC, Inc. (Dominion) have agreed to the issuance of this Consent Order to include the following Findings of Fact and Conclusions of Law.

FINDINGS OF FACT

1.

Dominion owns and is responsible for the proper operation and maintenance of the VC Summer Nuclear Station Off-site Water System (VC Summer WWTF) located at 400 Brabham Boulevard,.in Fairfield County, South Carolina. VC Summer WWTF serves Dominion's VC Summer Nuclear Station.

2.

The Department issued the National Pollutant Discharge Elimination System (NPDES)

Pennit SCG646072, authorizing VC Summer WWTF to discharge filter backwash to the Monticello Reservoir in accordance with effluent limitations, monitoring requirements and other permit conditions contained therein. The NP DES Permit became effective November 2, 2017 and has an expiration ~ate of December 30, 2020. The NPDES Permit is administratively continued due to an application for renewal of the permit being submitted at least one hundred eighty (180) days before the expiration of the permit.

1

3.

On November 9, 2021, Dominion emailed Department staff regarding operations at VC Sumnier WWTF. Dominion explained the laboratory servicing VC Summer WWTF has not been certified to perform total residual chlorine (TRC) since June 2018. Dominion explained the laboratory is in the process of being recertified for TRC, and until recertified, Dominion will use a certified vendor laboratory for TRC analysis.

4.

On November 18, 2021, Department staff issued a Notice ofViolation (NOV) to Dominion for failure to use a South Carolina state certified laboratory for sampling and analysis of TRC for the June 2018 through September 2019, December 2019 through March 2020, October 2020, December 2020, February 2021, June 2021, and July 2021 monthly monitoring periods. The certified copy was delivered on November 22, 2021. No response w~s required because Dominion submitted an explanation of the violation November 9, 2021.

5.

On January 6, 2022, Department staff issued a Notice of Alleged Violation. and Enforcement Conference (NOAV /EC) to Dominion via first class and certified mail. The NOAV/EC was delivered January I 0, 2022.

6.

On January 24, 2022, Department staff held an enforcement conference with Dominion.

Dominion explained the state certification for TRC was purposefully terminated, but the termination of the certification was not communicated with laboratory personnel for Dominion. Dominion further explained laboratory staff were regularly performing quality control testing while in violation and since identification of the violations, Dominion has been using a South Carolina state certified contract laboratory for TRC measurements. The issuance of a Consent Order containing a civil penalty was discussed.

2

CONCLUSIONS OF LAW Based upon the above Findings of Fact, the Department reaches the foll owing Conclusions ofLaw:

1.

Dominion violated the Pollution Control Act, S.C. Code Ann. § 48-1-ll0(d), Water Pollution Control Permits Regulation S.C. Code Ann. Regs. 61-9.122.41(a) and (e)(l), and State Environmental Laboratory Certification Regulations, S.C. Code Ann. Regs 61-68, by failing to submit to the Deparment analytical results for TRC from a South Carolina certified laboratory as required by NPDES Permit SCG646072.

2.

The Pollution Control Act, S.C. Code Ann. § 48-1-330, provides for a civil penalty not to exceed ten thousand dollars ($10,000.00) per day of violation for any person violating the Act or any rule, regulation, permit, permit condition, final determination, or Order of the Department.

NOW, THEREFORE, IT IS ORDERED, CONSENTED TO AND AGREED, pursuant to the Pollution Control Act, S.C. Code Ann. § 48-1-50 and 48-1-100, that Dominion shall:

I.

Within fifteen (15) days of the execution date of this Order, submit to the Department documentation verifying Dominion has contracted with a South Carolina certified laboratory to perform sampling and analysis for TRC.

2.

Pay to the Department, a civil penalty in the amount of four thousand eighty dollars

($4,080.00) within thirty (30) days of the execution date of this Order.

THE PARTIES FURTHER STIPULATE that Dominion shall pay a stipulated penalty in the amount of four thousand eighty dollars ($4,080.00) should it fail to comply. with any requirement 3

pursuant to this Consent Order. Such penalties shall be due and payable upon written notice to Dominion. The Department's determination that a requirement has not been met shall be final. All penalties due under this paragraph shall be made payable to the South Carolina Department of Health and Environmental Control within thirty (30) days of notification by the Department. The stipulated penalties set forth above shall be in addition to any other remedies or sanctions which may be available to the Department by reason of Dominion's failure to comply with any requirement of this Order.

PURSUANT TO THE ORDER, communications regarding this Order and its requirements, including civil penalty payments, shall be address as follows:

---

Harold ~i:.m, &fot:cemem Eroject Manager SCDHEC, Bureau of Water-WP Enforcement Section 2600 Bui] Street Columbia, South Carolina 29201 The Order number should be included on all checks remitted as payment of the civil penalty.

IT IS FURTHER ORDERED AND AGREED that failure to comply with any provision of this Order shall be grounds for further enforcement action pursuant to the Pollution Control Act, S.C.

Code Ann. § 48-1-330, to include the assessment of additional civil penalties.

IT IS FURTHER ORDERED AND AGREED that this Consent Order governs only the civil liability to the Department for civil sanctions arising from the matters set forth herein and constitutes the entire agreement between the Department and Dominion Energy SC, Inc, with respect to the resolution and settlement of these civil matters~ The parties are not relying upon any representations, promises, understandings or agreements except as expressly set forth within this Order.

4

THE PARTIES UNDERSTAND that the "execution date" of the Order is the date the Order is signed by the Director of Environmental Affairs.

[Signature Page Follows]

5

FOR THE SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL M~

c_ _ :13-R.e,u_

MyraC.

e Director of Environmental Affairs

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Q(ef:j~

Jeru&erR\\lgbes, Chief Bureau of Water Rob Devlin, Assistant Chief Bureau of Water E

• Attorney 7="

Office of.Genera) Cmmsel WE CONSENT:

Date: lf') 2 ) /2()22 I

Date: _ ___.4_-..... /_f_-~'Z.D

___,;.2_2_

Date: '/-/fJ,-2()2,2-VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM 0$~

Vice President 6

DISCHARGE MONITORING REPORT (DMR)

Facility Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC Limit Set: 06B1 QUANTITY OR LOADING PARAMETER Permit Number : SC0030856 v3. 5 DMR Period : 12/1/2021 -

12/31/2021 QUALITY OR CONCENTRATION AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Total Suspended Solids SAMPLE (00530) 0 0

MEASUREMENT Effluent Gross (1)

PERMIT 30 98 Lab ID: 40572 REQUIREMENT Monthly Average Dail y Maximum

!Oil and Grease (00556)

SAMPLE Effluent Gross (1) 0 0

MEASUREMENT La b ID: 23105 PERMI T 15 1 9 REQUIREMENT Monthly Average Dail y Maximum Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0.25800 0.25800 Lab ID: 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

DMR Comments: Oil & Grease Method EPA 1664B, PQL 5.0 mg/L, number of times results below PQL TSS Method SM 2540D-20 11, PQL 1. 0 mg/L, number of times results below PQL = one.

one.

Limit Set: 0071 NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law t hat this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure t hat qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, t he information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA rTYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated : 1/28/2022 5 : 03 PM UNITS mg/L mg/L TELEPHONE NUMBER Digitally signed by:

nCORE test

• Dal Re Loe No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Monthly Grab Monthly Grab 0

Monthly Grab Monthly Grab 0

INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthl y IN No Discharge :

DATE YEAR MO DAY Page 1 of 9

DISCHARGE MONITORING REPORT {DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3. 5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA I NC DMR Period: 12/1/2021 -

12/31/2021 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Total Suspended Solids SAMPLE (00530) 3.5 3.5 MEASUREMENT

~ffluent Gross (1)

PERMIT 30 100 Lab ID: 20001 REQUIREMENT Monthly Average Daily Maximum Piland Grease (00556)

SAMPLE Effluent Gross (1) 0 0

MEASUREMENT Lab ID: 23105 PERMIT 15 20 REQUIREMENT Monthly Average Daily Maximum Flow (50050)

Effluent Gross (1)

SAMPLE 0.0933 0.144900 MEASUREMENT Lab ID: 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

DMR Comments: Oil & Grease Method EPA 1664B, PQL 5.0 mg /L, number of times results below PQL one.

Limit Set: 0011 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Temperature (F)

SAMPLE I

I I

I (00011) 76.70 94. 63 MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the UNITS mg/L mg/L UNITS I

deg F TELEPHONE information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA I NUMBER TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and

~FFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated : 1/28/2022 5 : 03 PM NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Monthly Grab Monthly Grab 0

Monthly Grab Monthly Grab 0

Three INSTANTA per Discharge NEOUS IN INSTANTA NEOUS Monthly IN No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Cont i nuou Continue s

us DATE YEAR MO DAY Page 2 of 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS Effluent Gross (1)

PERMIT Lab ID: 20001 REQUIREMENT Temperature (F)

SAMPLE (00011)

MEASUREMENT Intake from Stream (7)

Lab ID: 2 0001 PERMIT REQUIREMENT pH (00400)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID : 20001 PERMIT REQUIREMENT Flow (50050)

SAMPLE Effluent Gross (1) 492.47 492.47 MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average BROMIDE (71870)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID: 23105 PERMIT REQUIREMENT Permit Number: SC0030856 v3. 5 DMR Period: 12/1/2021 -

12/31/2021 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM REPORT 113 Monthly Average Daily Maximum 57.23 58.49 REPORT REPORT Monthly Average Daily Maximum 7. 11 7.11 6. 0 8. 5 Instantaneous Instantaneous Minimum Maximum 0

0 REPORT REPORT Monthly Average Daily Maximum NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Continuou Continue s

us 0

Continuou Continue s

us deg F Continuou Continue s

us 0

Monthly Grab SU Monthly Grab 0

Continuou Continue s

us Continuou Continue s

us 0

Monthly Grab mg/L Monthly Grab DMR Instructions: MLOC 1 - DISCHARGE TEMPERATURE DISCHARGE SAMPLES SHALL BE COLLECTED AFTER THE COMBINATION OF ALL WASTE STREAMS BUT PRIOR TO MIXING WITH THE RECEIVING STREAM. MLOC 7 -

INTAKE TEMP= SHALL BE MONITORED ON THE INLET SIDE OF THE MAIN CONDENSER.

DMR Comments : Bromide Method EPA 300. 0, PQL 0. 5 mg/L, number of times results below PQL = one.

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system TELEPHONE DATE designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 1/28/2022 5 : 03 PM Page 3 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA I NC Limit Set: 0041 QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS Total Suspended Solids SAMPLE (00530)

MEASUREMENT Effluent Gross (1)

PERMIT Lab ID: 20001 REQUIREMENT K)il and Grease (00556)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID: 23105 PERMIT REQUIREMENT Flow (50050)

SAMPLE Effluent Gross (1) 0.189324 0.189324 MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQU IREMENT Monthly Daily Maximum Average Permit Number: SC0030856 v3.5 DMR Period: 12/1/2021 -

12/31/2021 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM 2. 9 2.9 30 100 Monthly Average Daily Maximum 0

0 15 20 Monthly Average Daily Maximum No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS 0

Monthly Grab mg/L Monthly Grab 0

Monthly Grab mg/L Monthly Grab 0

Calculat Monthly ion Calculat Monthly ion DMR Instructions: FLOW= SHALL BE THE SUM OF THE FLOWS FROM EACH CONTINUOUSLY MON ITORED STEAM GENERATOR BLOWDOWN LINE.

DMR Comments : Oi l

& Grease Method EPA 1664B, PQL 5. 0 mg/L, number of times results below PQL = one.

Limit Set: 0141 No Discharge:

QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS rH (00400)

SAMPLE I

I I

I I

1 Twice per Grab Effluent Gross (1) 8.36 8.8 SU Month MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system TELEPHONE DATE designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant

!SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY rrvPED OR PRINTED penalties for submitting false information, including the possibility of fi ne and K)FFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 1/28/2022 5 : 03 PM Page 4 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS Lab ID: 20001 PERMIT REQUIREMENT rrotal Phosphorus (as SAMPLE P)

(00665)

MEASUREMENT Effluent Gross (1)

PERMIT Lab ID: 23105 REQUI~EMENT Flow (50050)

(1)

SAMPLE 0.135732 0.350045 Effluent Gross MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions :

Permit Number: SC0030856 v3.5 DMR Period: 12/1/2021 -

12/31/2021 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM 6.0 8. 5 Instantaneous Instantaneous Minimum Maximum 0.29 0.29 REPORT REPORT Monthly Average _Daily Maximum DMR Comments: COMMENT and EXPLANATION of EXCEEDANCE for OUTFALL 014 NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Monthly Grab 0

Monthly Grab mg/L Monthly Grab 0

Continuou Continue s

us Continuou Continue s

us A grab compliance pH sample of 8. 8 su was obtained from Outfall 014 and a backup aliquot had the same results from the December 3, 2021 NPDES sampling event.

Because the sample results were not indicative of the discharged stream, Chemistry personnel suspected the initial and backup samples were contaminated. Upon investigation, it was determined that the telescoping sample cup was used to check the water quality at Outfall 006B during cleanup efforts for the November 16, 2021 transformer oil spill.

VCS believes the initial pH sample result is due to cross contamination introduced by using the same telescoping sample cup to obtain the monthly sample for Outfall 014.

A new telescoping sample cup was used an hour later to obtain another sample and another aliquot using what was analyzed using another pH meter.

The first sample with the new apparatus was 8. 36 su and the second aliquot result was 8.39 su.

This occurrence has been documented in the station's corrective action program (CR 03611).

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant

$1GNA TURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO rrvPED OR PRINTED penalties for submitting false information, including the possibility of fine and PFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

DAY Permit Number: SC0030856 v3. 5 Generated: 1/28/2022 5:03 PM Page 5 of 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC Permit Number: SC0030856 v3.5 DMR Period : 12/1/2021 -

12/31/2021 Since VCS cannot invalidate the original 8.8 su pH due to the analytical methodology, VCS is reporting this value as an exceedance of the Daily Maximum Limit of 8.5 su.

However, the second compliance sample result of 8. 36 su is being reported as the monthly minimum value since pH values cannot be averaged.

The result is within the permit limit of 6.0 su.

VCS is not reporting the second aliquots as these were taken for method verification purposes consistent with SCDHEC guidance.

DMR Value Comments:

pH, Effluent Gross (1), Limit: 8.5 Instantaneous Maximum, Reported Value: 8. 8, Comment: Suspected sample container cross contamination.

See General Report Comments for full details.

Limit Set: 0031 No Discharge:

QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS pH (00400)

SAMPLE 0

Once per Grab Effluent Gross (1) 7.42 7.86 Discharge MEASUREMENT SU Lab ID: 20001 6. 0 9.0 PERMIT Grab REQUIREMENT Instantaneous Instantaneous Monthly Minimum Maximum Total Suspended Solids 0

Twice per SAMPLE Grab (00530) 0 0

Month MEASUREMENT Effluent Gross (1) mg/L Lab ID: 20001 PERMIT 30 100 Grab REQUIREMENT Monthly Average Daily Maximum Monthly Oil and Grease (00556)

SAMPLE 0

Twic e per Grab Effluent Gross (1) 0 0

Month MEASUREMENT mg/L Lab ID : 10120 PERMIT 15 20 Grab REQUIREMENT Monthly Average Daily Maximum Monthly NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and lslGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA NUMBER YEAR MO DAY

[TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and loFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated : 1/28/2022 5 : 03 PM Page 6 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3. 5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA I NC DMR Period: 12/1/2021 -

12/31/2021 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Flow (50050)

SAMPLE Effluent Gross (1) 0. 004 181 0. 004200 MEASUREMENT MGD Lab ID : 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

DMR Comments: Total Suspended Solids Method SM2540D, PQL 1. 0 mg/L, number of times result less than PQL Oil & Grease Method EPA 1664B, PQL 5.0 mg/L, number of times results below PQL = two.

Limit Set: 0051 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM BOD -

5 DAY (20 DEGREES C)

(00310)

SAMPLE 9. 8 9. 8 Effluent Gross (1)

MEASUREMENT Lab ID: 40572 PERMIT 30 45 REQUIREMENT Monthly Average Daily Maximum Total Suspended Solids (00530)

SAMPLE 6. 7 6.7 Effluent Gross (1)

MEASUREMENT Lab ID: 40572 PERMIT 30 45 REQUIREMENT Monthly Average Dail y Maximum NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the UNITS two.

UNITS mg/L mg/L TELEPHONE information, the information submitted is, to the best of my knowledge and lslGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA I NUMBER TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number : SC0030856 v3. 5 Generated: 1/28/2022 5:03 PM NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Once per ESTIMATE Discharge ES ESTIMATE Monthly ES No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

24 - Hr Monthly Composit e

24 - Hr Monthly Composit e

0 24 - Hr Monthly Composit e

24 - Hr Monthly Composit e

DATE YEAR MO DAY Page 7 o f 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3.5 Permittee Name : DOMINION ENERGY SOUTH CAROLINA INC DMR Period: 12/1/2021 -

12/31/2021 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0.00700 0.00700 Lab ID: 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average IE. COLI (MPN/l00ML)

SAMPLE

<10

<10 (51040)

MEASUREMENT Effluent Gross (1)

PERMIT 126 349 Lab ID : 40572 30 Day Average REQUIREMENT Geometric Daily Maximum DMR Instructions:

DMR Comments: (none)

Limit Set: 06Al QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Total Suspended Solids SAMPLE (00530) 0 0

MEASUREMENT Effluent Gross (1)

PERMIT 30 100 Lab ID: 40572 REQUIREMENT Monthly Average Daily Maximum Oil and Grease (00556)

SAMPLE 0

0 Effluent Gross (1)

MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the UNITS

1. /l00mL UNITS mg/L mg/L TELEPHONE information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA I NUMBER rTYPED OR PRINTED penalties for submitting false information, including the possibility of fine and loFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated: 1/28/2022 5 : 03 PM NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN 0

Monthly Grab Monthly Grab No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Monthly Grab Monthly Grab 0

Monthly Grab DATE YEAR MO DAY Page 8 of 9

DISCHARGE MONITORING REPORT {DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number : SC0030856 v3. 5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC DMR Period : 12/1/2021 -

12/31/2021 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Lab ID: 23105 PERMIT 15 20 REQUIREMENT Monthly Average Daily Maximum Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0.016500 0.016500 Lab ID: 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

DMR Comments : TSS Method SM2540D-2011, PQL=lmg/L, number of times results below PQL = one Oil & Grease Method EPA 16648, PQL 5.0 mg/L, number of times results below PQL = one.

Limit Set: 0081 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM rrotal Suspended Solids SAMPLE (00530)

MEASUREMENT Effluent Gross (1)

PERMIT 30 100 Lab ID:

REQUIREMENT Monthly Average Dai l y Maximum Pil and Grease (00556)

SAMPLE Effluent Gross (1)

MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the UNITS UNITS mg/L mg/L TELEPHONE information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant

!SIGNATURE OF PRINCIPAL EXECUTNE AREA I NUMBER

!TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and PFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 1/28/2022 5 : 03 PM NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS Monthly Grab 0

INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN No Discharge: Y NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS Monthly Grab Monthly Grab Monthly Grab DATE YEAR MO DAY Page 9 of 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS Lab ID:

PERMIT REQUIREMENT Total Copper (01042)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID :

PERMIT REQUIREMENT Total Iron (01045)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID:

PERMIT REQU IREMENT Flow (50050)

Effluent Gross ( 1 )

SAMPLE MEASUREMENT Lab ID:

MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average Permit Number: SC0030856 v3. 5 DMR Period: 12/1/2021 -

12/31/2021 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM 15 20 Monthly Average Daily Maximum 1.0 1.0 Monthly Average Daily Maximum 1.0 1.0 Monthly Average Daily Maximum NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Monthly Grab Monthly Grab mg/L Monthly Grab Monthly Grab mg/L Monthly Grab INSTANTA Monthly NEOUS I N INSTANTA NEOUS Monthly IN DMR Instructions: COPPER & IRON -

SAMPLING IS REQUIRED ONLY WHEN CHEMICAL METAL CLEAING WASTES ARE DISCHARGED. REPORT ' CONDITONAL' ON THE DMR FORM WHEN CHEMICAL METAL CLEANING WASTES ARE NOT DISCHARGED DURING THE MONI TORING PERIOD.

DMR Comments: (none)

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system TELEPHONE DATE designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 1/28/2022 5 : 03 PM Page 10 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMI NION ENERGY SOUTH CAROLINA INC Limit Set: 06B1 QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS

~otal Suspended Solids SAMPLE (00530)

MEASUREMENT Effluent Gross (1)

PERMIT Lab ID: 23105 REQUIREMENT Pil and Grease (00556)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID: 23105 PERMIT REQUIREMENT Flow (50050)

~ffluent Gross (1)

SAMPLE MEASUREMENT

0. 011800 0.011800 Lab ID: 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

Permit Number: SC0030856 v3.5 DMR Period : 3/1/2022 -

3/31/2022 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM 32. 6 32.6 30 98 Monthly Average Daily Maximum 5.4 5.4 15 19 Monthly Average Daily Maximum DMR Comments: Oil & Grease Method EPA 1664B, PQL 5. 0 mg/L, number of times results below PQL one.

UNITS mg/L mg/L Digitally signecib

• nCORE test.wind Oat Re Loe No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 1

Monthly Grab Monthly Grab 0

Monthly Grab Monthly Grab 0

INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN TSS - Analysis of a grab sample of 06B on 3/7 yielded a TSS value of 32. 6 ppm. Delays in receiving and reviewing the vendor data resulted in a missed opportunity for additional samples during the month, yielding an exceedance of the monthly average limit of 30mg/l. This higher than normal TSS value is believed to be an anomaly as results from the previous 4 years do not exceed 15 ppm. In addition, the RPO between the sample/duplicate or matrix spike/spike duplicate was not within control limits due to matrix interference.

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY rrYPED OR PRINTED penalties for submitting false information, including the possibility of fine and bFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated: 4/28/2022 9 : 58 AM Page 1 of 9 a

DISCHARGE MONITORING REPORT (DMR)

Facility Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROL I NA INC Permit Number : SC0030856 v3.5 DMR Period: 3/1/2022 -

3/31/2022 A follow-up analysis of a grab sample of 06B on 4/4 yielded 6.7 ppm.

DMR Value Comments:

Total Suspended Solids, Effluent Gross (1), Limit : 30 Monthly Average, Reported Value : 32. 6, Comment : An explanation for this higher than normal TSS value is noted in the General Report Comments Section.

Limit Set: 0071 No Discharge:

QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS Total Suspended Solids SAMPLE 0

Monthly Grab (00530) 3 3

MEASUREMENT Effluent Gross (1 )

mg/L PERMIT 30 100 Grab Lab ID: 20001 Monthly REQUIREMENT Monthly Average Daily Maximum Oil and Grease (00556)

SAMPLE 0

Monthly Grab Effluent Gross (1) 0 0

MEASUREMENT mg/L Lab ID: 23105 PERMIT 15 20 Grab REQUIREMENT Monthly Average Daily Maximum Monthly Flow (50050) 0 INSTANTA Effluent Gross (1)

SAMPLE 0.090000 0.090000 Monthly NEOUS MEASUREMENT IN Lab ID: 20001 MGD REPORT INSTANTA PERMIT REPORT NEOUS REQUIREMENT Monthly Daily Maximum Monthly IN Average DMR Instructions:

DMR Comments : Oil & Grease Method EPA 1664B, PQL 5. 0 mg/L, number of times results below PQL one.

NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system TELEPHONE DATE designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 4/28/2022 9:58 AM Page 2 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3. 5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC DMR Period: 3/1/2022 -

3/31/2022 Limit Set: 0011 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM rremperature (F)

SAMPLE (00011) 83. 56 87.06 MEASUREMENT Effluent Gross ( 1)

Lab ID : 20001 PERMIT REPORT 113 REQUIREMENT Monthly Average Daily Maximum rremperature (F)

SAMPLE (00011) 58.24

61. 39 MEASUREMENT Intake from Stream (7)

Lab ID: 20001 PERMIT REPORT REPORT REQUIREMENT Monthly Average Daily Maximum pH (00400)

SAMPLE

7. 71

7. 71 Effluent Gross (1)

MEASUREMENT Lab ID: 20001 6. 0 8. 5 PERMIT REQU IREMENT Instantaneous Instantaneous Minimum Maximum Flow (50050)

SAMPLE 738. 72 738. 72 Effluent Gross (1)

MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average BROMIDE (71870)

SAMPLE Effluent Gross (1) 0 0

MEASUREMENT Lab ID : 23105 PERMIT REPORT REPORT REQUIREMENT Monthly Average Daily Maximum NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated: 4/28/2022 9 : 58 AM No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS 0

Continuou Continue s

us deg F Continuou Continue s

us 0

Continuou Continue s

us deg F Continuou Continue s

us 0

Monthly Grab SU Monthly Grab 0

Continuou Continue s

us Continuou Continue us s

0 Monthly Grab mg/L Monthly Grab TELEPHONE DATE NUMBER YEAR MO DAY Page 3 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC Permit Number : SC0030856 v3. 5 DMR Period: 3/1/2022 -

3/31/2022 DMR Instructions: MLOC 1 -DISCHARGE TEMPERATURE DISCHARGE SAMPLES SHALL BE COLLECTED AFTER THE COMBINATION OF ALL WASTE STREAMS BUT PRIOR TO MIXING WITH THE RECEIVING STREAM. MLOC 7 -

INTAKE TEMP= SHALL BE MONITORED ON THE INLET SIDE OF THE MAIN CONDENSER.

DMR Comments: Bromide Method EPA 300. 0, PQL 1. 0 mg/L, number of times results below PQL = one.

Limit Set: 0041 No Discharge: Y QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS Total Suspended Solids SAMPLE Monthly Grab (00530)

MEASUREMENT Effluent Gross (1) mg/L PERMIT 30 100 Grab Lab ID:

Monthly REQUIREMENT Monthly Average Daily Maximum Oil and Grease (00556)

SAMPLE Monthly Grab Effluent Gross (1)

MEASUREMENT mg/L Lab ID:

PERMIT 15 20 Grab REQUIREMENT Monthly Average Daily Maximum Monthly Flow (50050)

SAMPLE Monthly Calculat Effluent Gross (1) ion MEASUREMENT MGD Lab ID:

REPORT Calculat PERMIT REPORT REQUIREMENT Monthly Daily Maximum Monthly ion Average DMR Instructions: FLOW SHALL BE THE SUM OF THE FLOWS FROM EACH CONTINUOUSLY MONITORED STEAM GENERATOR BLOWDOWN LINE.

DMR Comments: (none)

Limit Set: 0141 No Discharge:

NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system TELEPHONE DATE designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated : 4/28/2022 9:58 AM Page 4 of 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3.5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC DMR Period: 3/1/2022 -

3/31/2022 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM IPH (00400)

SAMPLE Effluent Gross (1) 7.48 7. 48 MEASUREMENT Lab ID: 20001 6. 0 8. 5 PERMIT REQUIREMENT Instantaneous Instantaneous Minimum Maximum Total Phosphoru s (as SAMPLE P)

(00665) 2. 2 2. 2 MEASUREMENT Effluent Gross (1)

PERMIT REPORT REPORT Lab ID: 23105 REQUIREMENT Monthly Average Daily Maximum Flow (50050)

SAMPLE Effluent Gross (1) 0. 0675249 0. 1240239 MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions :

DMR Comments: (none)

Limit Set: 0031 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM pH (00400)

SAMPLE I

I I

I Effluent Gross (1) 6. 96 7.86 MEASUREMENT NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the UNITS SU mg/L UNITS I

SU TELEPHONE information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA I NUMBER TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated: 4/28/2022 9 : 58 AM NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Monthly Grab Monthly Grab 0

Monthly Grab Monthly Grab 0

Continuou Continue s

us Continuou Continue s

us No Discharge :

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Once per Grab Discharge DATE YEAR MO DAY Page 5 of 9

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3. 5 DMR Period: 3/1/2022 -

3/3 1/2022 Permittee Name: DOMI NION ENERGY SOUTH CAROLI NA I NC QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Lab ID : 20001 PERMI T 6. 0 9.0 Insta ntaneous Instantaneou s REQU I REMENT Minimum Maximum rrotal Suspended Solids SAMPLE (00530) 0 0

MEASUREMENT Effluent Gross (1)

Lab ID : 20001 PERMIT 30 100 REQUIREMENT Monthl y Average Daily Maximum Piland Grease (0055 6 )

Effluent (1)

SAMPLE 0

0 Gross MEASUREMENT Lab ID: 10120 PERMIT 15 20 REQU I REMENT Monthly Average Daily Maximum Flow (50050)

SAMPLE 0. 004200 0.004200 Effluent Gross (1)

MEASUREMENT MGD Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average DMR Instructions:

DMR Comments : Total Suspended Solids Method SM2540D, PQL 1. 0 mg/L, number of t imes result les s than PQL Oil & Grease Method EPA 1664B, PQL 5. 0 mg/L, number of times results below PQL = two.

Limit Set: 0051 NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a syst em designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA rTYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generat ed : 4/28/2022 9:58 AM NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Monthly Gr ab 0

Twi ce per Grab Discharge mg/L Monthly Grab 0

Twice per Grab Month mg/L Monthly Grab 0

Once per ESTIMATE Discharge ES ESTIMATE Monthly ES two.

No Discharge:

TELEPHONE DATE NUMBER YEAR MO DAY Page 6 o f 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number: SC0030856 v3.5 Permittee Name: DOMINION ENERGY SOUTH CAROLINA I NC DMR Period: 3/1/2022 -

3/31/2022 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM BOD -

5 DAY (20 DEGREES C)

(00310)

SAMPLE 2.6 2.6 Effluent Gross (1)

MEASUREMENT Lab ID: 40572 PERMIT 30 45 REQUIREMENT Monthly Average Daily Maximum Total Suspended Solids (00530)

SAMPLE 5. 1 5.1 Effluent Gross (1)

MEASUREMENT Lab ID: 40572 PERMIT 30 45 REQUIREMENT Monthly Average Daily Maximum Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0.005000 0.005000 Lab ID : 20001 MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average E. COLI (MPN/l00ML)

SAMPLE (51040)

<10

<10 MEASUREMENT Effluent Gross (1)

PERMIT 126 349 Lab ID: 40572 30 Day Average REQUIREMENT Geometric Daily Maximum DMR Instructions:

DMR Comments: (none)

NAME/ TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant islGNATURE OF PRINCIPAL EXECUTNE AREA

[TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 4/28/2022 9 : 58 AM NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS 0

24 -Hr Monthly Composit e

mg/L 24 - Hr Monthly Composit e

0 24 -Hr Monthly Composit e

mg/L 24-Hr Monthly Composit e

0 INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN 0

Monthly Grab

1. /l0OmL Monthly Grab TELEPHONE DATE NUMBER YEAR MO DAY Page 7 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC Limit Set: 06Al QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS

~otal Suspended Solids SAMPLE (00530)

MEASUREMENT

~ffluent Gross (1 )

PERMIT Permit Number : SC0030856 v3. 5 DMR Period: 3/1/2022 -

3/31/2022 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM

1. 2 1.2 30 100 Lab ID: 40572 REQUIREMENT Monthly Average Daily Maximum K)il and Grease (00556)

SAMPLE 0

0 Effluent Gross (1)

MEASUREMENT Lab ID: 23105 PERMIT 15 20 REQUIREMENT Monthly Average Daily Maximum Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0. 016500 0. 016500 Lab ID : 20001 MGD REPORT PERMIT REPORT REQU IREMENT Monthl y Daily Maximum Avera ge DMR Instructions:

DMR Comments: Oil & Grease Method EPA 1664B, PQL 5. 0 mg/1, number of times results below PQL one.

Limit Set: 0081 QUANTITY OR LOADING QUALITY OR CONCENTRATION PARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM Total Suspended Solids SAMPLE I

I I

I (00530)

MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant SIGNATURE OF PRINCIPAL EXECUTIVE AREA TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated: 4/28/2022 9:58 AM No Discharge :

NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS 0

Monthly Grab mg/L Monthly Grab 0

Monthly Grab mg/L Monthly Grab 0

INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN No Discharge: Y NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS I

mg/L Monthly Grab TELEPHONE DATE NUMBER YEAR MO DAY Page 8 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name : DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM UNITS

!Effluent Gross (1)

PERMIT Lab ID :

REQUIREMENT K)il and Grease (00556)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID:

PERMIT REQUIREMENT Total Copper (01042)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab ID:

PERMIT REQUIREMENT rrotal Iron (01045)

SAMPLE Effluent Gross (1)

MEASUREMENT Lab I D:

PERMIT REQUIREMENT Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT Lab ID:

MGD REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average Permit Number : SC0030856 v3.5 DMR Period : 3/1/2022 -

3/31/2022 QUALITY OR CONCENTRATION MINIMUM AVERAGE MAXIMUM 30 100 Monthly Average Daily Maximum 15 20 Monthly Average Daily Maximum

1. 0 1.0 Monthly Average Daily Maximum 1.0 1.0 Monthly Average Dai l y Maximum NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Monthly Grab Monthly Grab mg/L Monthly Grab Monthly Grab mg/L Monthly Grab Monthly Grab mg/L Monthly Grab INSTANTA Monthly NEOUS IN INSTANTA NEOUS Monthly IN DMR Instructions : COPPER & IRON -

SAMPLING IS REQUI RED ONLY WHEN CHEMICAL METAL CLEAING WASTES ARE DISCHARGED. REPORT ' CONDITONAL ' ON THE DMR FORM WHEN CHEMICAL METAL CLEANING WASTES ARE NOT DISCHARGED DURING THE MONITORING PERIOD.

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant

!SIGNATURE OF PRINCIPAL EXECUTIVE AREA NUMBER YEAR MO DAY

!TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SC0030856 v3.5 Generated : 4/28/2022 9 : 58 AM Page 9 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SOUTH CAROLINA INC/V C SUMMER NUCLEAR STATION Permit Number : SC0030856 v3. 5 Permittee Name : DOMINION ENERGY SOUTH CAROLINA INC DMR Period: 3/1/2022 -

3/31/2022 DMR Comments: (none)

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were prepared under my direction or supervision In accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant rfYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT imprisonment for knowing violations.

Permit Number: SC0030856 v3. 5 Generated : 4/28/2022 9:58 AM TELEPHONE DATE AREA NUMBER YEAR MO DAY CODE Page 10 of 9

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM Permittee Name: DOMI NION ENERGY SOUTH CAROLINA INC Limit Set: OSAl QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM ri'otal Manganese SAMPLE (0 1055 )

MEASUREMENT Effluent Gross (1)

PERMIT Lab ID: 23105 REQUIREMENT Flow (50050)

Effluent Gross (1)

SAMPLE MEASUREMENT 0. 648 0.648 Lab ID: 20001 REPORT PERMIT REPORT REQUIREMENT Monthly Daily Maximum Average Permit Number : SCG646072 v2.1 DMR Period: 1/1/2022 -

1/31/2022 QUALITY OR CONCENTRATION UNITS MINIMUM AVERAGE MAXIMUM 0. 02 0. 02 REPORT REPORT Monthly Average Daily Maximum MGD UNITS mg/L Digitally signed by:

nCORE test.wind Oat Re Lo No Discharge:

NO. FREQUENCY SAMPLE EX.

OF TYPE ANALYSIS 0

Monthly Grab Monthly Grab 0

Once per INSTANTA Monthly NEOUS Discharge IN INSTANTA NEOUS Weekly IN DMR Instructions: OUTFALL 05A 1-REVERSE OSMOSIS DISCHARGING TO FRESHWATERS (FW); TREATED FILTER BACKWASH WATER, SEDIMENTATION WASH DOWN WATER AND DECANT WATER.

DMR Comments: (none)

Limit Set: 08Al No Discharge :

QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS Total Residual SAMPLE 2

Monthly Grab 0.05 0.05 Chlorine (50060)

MEASUREMENT Effluent Gross (1) mg/L PERMIT 0. 011 0. 019 Grab Lab ID: 40572 Monthly REQUIREMENT Monthly Average Daily Maximum NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and OFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number: SCG646072 v2. 1 Generated : 2/28/2022 2 :17 PM Page 1 of 2

DISCHARGE MONITORING REPORT (DMR)

Facility Name: DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM Permittee Name: DOMINION ENERGY SOUTH CAROLINA I NC Permit Number: SCG646072 v2. 1 DMR Period: 1/1/2022 -

1/31/2022 DMR Instructions : OUTFALL OBA 1-TOTAL RESIDUAL CHLORIINE (TRC) LIMITS FOR ALL WATER CLASSIFICATIONS (FW, FW sp, SA, SB, SA sp, SB sp,

or SFH).

DMR Comments : DESC VCS is skeptical of the TRC 0. 05 mg/L result for the following reasons :

Prior to the discharge sample, VCS personnel obtained multiple samples from both retention basins and obtained results that were less than 0.05 mg/L (nondetectable).

VCS's reverse osmosis system backwash process only contains raw water, which isn't treated with chlorine.

Throughout the Offsite Water System operating history, TRC has never been detected at the outfall.

There is no significant source of chlorine to the retention basins that could result in TRC level of 0. 05 mg/L.

The occurrence of TRC res~lts above the permitted limit~ has been entered into the stati;n ' ~ correttive action ~rogram (CR1192303) and is under evaluation to determine the source and the validity of TRC 0.05 mg/L result.

DMR Value Comments:

Total Residual Chlorine, Effluent Gross (1), Limit: 0. 011 Monthly Average, Reported Value: 0. 05, Comment : DESC is investigating the source of TRC.

The results are suspect because TRC was never detected at the discharge previously.

See General Report Comments for full details.

Total Residual Chlorine, Effluent Gross (1), Limit: 0.019 Daily Maximum, Reported Value : 0.05, Comment: DESC is investigating the source of TRC.

The results are suspect because TRC was never detected at the discharge previously.

See General Report Comments for ful l details.

Limit Set: 07A3 No Discharge:

QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX.

OF TYPE AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TEMPERATURE DIFFERENCE SAMPLE I

I I

I I

deg F 0

Monthly Grab (FAHRENHEIT)

(00018) 58.0 58.0 MEASUREMENT NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, true, accurate, and complete. I am aware that there are significant AREA NUMBER YEAR MO DAY il"YPED OR PRINTED penalties for submitting false information, including the possibility of fine and bFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number : SCG646072 v2. 1 Generated: 2/28/2022 2:17 PM Page 2 of 2

DISCHARGE MONITORING REPORT (DMR)

Faci1ity Name: DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM Permittee Name: DOMINION ENERGY SOUTH CAROLINA INC QUANTITY OR LOADING PARAMETER AVERAGE MAXIMUM Effluent Gross (1)

PERMIT Lab ID: 20001 REQUIREMENT Permit Number: SCG646072 v2.l DMR Period: 1/1/2022 -

1/31/2022 QUALITY OR CONCENTRATION UNITS MINIMUM AVERAGE MAXIMUM REPORT REPORT Monthly Average Daily Maximum NO. FREQUENCY SAMPLE EX.

OF TYPE UNITS ANALYSIS Monthly Grab DMR Instructions: OUTFALL 07A 3-ION EXCHANGE AND REVERSE OSMOSIS DISCHARGING TO CLASS FW, FW sp WITH SITE-SPECIFIC STANDARDS, SA, SA sp, SB, SB sp, or SFH WATERS.

DMR Comments: (none)

NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I Certify under penalty of law that this document and all attachments were TELEPHONE DATE prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and SIGNATURE OF PRINCIPAL EXECUTIVE belief, tru e, accurate, and complete. I am aware that there are significant AREA NUMBER YEAR MO DAY TYPED OR PRINTED penalties for submitting false information, including the possibility of fine and bFFICER OR AUTHORIZED AGENT CODE imprisonment for knowing violations.

Permit Number : SCG646072 v2. l Generated : 2/28/2022 2 : 17 PM Page 3 of 2

Healthy People. Healthy Communities CERTIFIED MAIL-9214 8969 0099 9790 1421 3706 01 April 6, 2022 DOMINION ENERGY SOUTH CAROLINA INC Attn: GEORGE A LIPPARD PO BOX 88 JENKINSVILLE, SC 29065 Re:

Notice of Violation AI-0005261 Pennit # SCG646072 v2. l DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM Fairfield County

Dear GEORGE A LIPPARD:

A review of the discharge monitoring reports (DMRs) submitted to the Department for the January 2022 monitoring period has revealed the following violations:

PIPE#

PARAMETER DATE LIMIT DMR AVG/MAX 08A 50060-Total Residual January 3 l, 0.019 0.05 Daily Maximum Chlorine 2022 08A 50060-Total Residual January 31, 0.01 I 0.05 Monthly Average Chlorine 2022 You are hereby notified that failure to comply with the effluent limits of the NPDES Permit is a violation of the Pollution Control Act, S.C. Code Ann. 48-1-11 0(d) and Water Pollution Control Permits, 3 S.C.

Code Ann. Regs. 61-9.122.4l(a). The violations make DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM subject to further enforcement action, which may include assessment of civil penalties as set forth in the Pollution Control Act, S.C. Code Ann. 48-1-330.

You are requested to submit a written response within ten (10) days ofreceipt of this notice. Your response should include an explanation for the violations cited above and measures that have been or will be taken to ensure compliance with permit conditions. This response will not relieve DOMINION ENERGY SC INC VC SUMMER NUCLEAR STATION OFF-SITE WATER SYSTEM ofresponsibility for the violations cited.

If you have any questions concerning this notice, you may contact me at 803-896-2333 or oblandjl@dhec.sc.gov. I will be glad to assist you.

Jacob Oblander Environmental Quality Manager Bureau of Water cc:

Midlands EA Columbia