Text

Energy Northwest to NMFS, Columbia Generating Station 2019 Biological Monitoring Report
	ML20036E843
Person / Time
Site:	Columbia
Issue date:	02/03/2020
From:	Khounnala S; Energy Northwest
To:	Graves R; Office of Nuclear Material Safety and Safeguards, US Dept of Commerce, National Marine Fisheries Service
	Briana Grange 301-415-1042
References
	GO2-20-027
	Download: ML20036E843 (88)
	v • d • e

Shannon E. Khounnala ENERGY Columbia Generating Station P.O. Box 968, MD PE03 Richland, WA 99352-0968 NORTHWEST Ph. 509-377-8639 sekhounnala@energy-northwest.com February 3, 2020 GO2-20-027 DIC 404.1 Ritchie Graves Columbia Hydropower Branch National Marine Fisheries Service VIA E-MAIL AND US MAIL 1201 NE Lloyd Blvd, Suite 1100 Portland, OR 97232

Dear Mr. Graves:

Subject:

2019 BIOLOGICAL MONITORING REPORT

Reference:

Letter, GI2-17-061, March 10, 2017, from Barry A. Thorn (National Marine Fisheries Service) to Jeffery J. Rikhoff (Division of License Renewal, Office of Nuclear Regulation) Endangered Species Act Section 7(a)(2) Biological Opinion, and Magnusion-Stevens Fishery Conservation and Management Act Essential Fish Habitat Response for Renewing the Operating License for the Columbia Generating Station, Washington, Condition 2.9.4(4)(a).

Condition 2.9.4(4)(a) of the Endangered Species Act 7(a)(2) Biological Opinion requires the Energy Northwest to submit an annual summary of biological monitoring data and reports submitted pursuant to NPDES Permit WA002515-1. Attached is the 2019 Biological Monitoring Report.

If you have any questions regarding this report, I can be reached at (509) 377-8639.

Sincerely, 03/02/20 16:21:21 -08:00 X

Khounnala, Shannon E. , Environme Shannon E. Khounnala Environmental and Regulatory Programs Manager SEK/nb

Attachments: 1. GO2-20-026 - 2019 Post Season Fish Collection Report - Attachment 1

2. GO2-20-026 - 2019 NPDES Permit DMRs - Attachment 2 cc: Brianna Grange, NRC, Briana.Grange@NRC.gov NRC Document Control Desk EndangeredSpecies.Resources@NRC.gov INTERNAL DISTRIBUTION: FILE COPY SEK/lb I Columbia Files 964Y I Docket File PE20

Prepared by Energy Northwest Environmental Services, January 2020 Energy Northwest Columbia Generating Station 2019 Post Season Fish Collection Report The purpose of this report is to document fish collection activities on the part of Energy Northwest (ENW) during the 2019 calendar year and to verify that the activities were in compliance with the Endangered Species Act section 7(a)(2)

Biological Opinion for the Columbia Generating Station (NMFS No: NWR/2011/05286) issued March 10, 2017. Also included is a discussion on changes in CGS operations during the 2019 calendar year that had the potential to affect CGS effluent discharges to the Columbia River.

Fish Collection Columbia Generating Station (CGS) is required to collect and analyze fish samples from locations near the CGS effluent discharge in the Columbia River and from a control location, typically the Snake River. The samples are analyzed for radioactive content with the purpose of determining what impact, if any, CGS operation may have on Columbia River fish. The requirements specify collection of one anadromous and two resident fish species from both locations. The fish collection activities are to be performed in accordance with the Endangered Species Act section 7(a)(2) Biological Opinion for the Columbia Generating Station.

Resident Species Collection Columbia River The two resident fish species collected from the Columbia River in 2019 were walleye and small mouth bass. Two walleye were obtained as a fisherman donation in August. Information provided by the fishermen indicated the fish were caught on 8/15/19 within vicinity of the green buoy marking the Columbia Generating Station (CGS) discharge location.

Energy Northwest (ENW) personnel collected one small mouth bass on 7/22/19 from shoreline near CGS and IDC pump house. GPS coordinates were recorded as 46.475822, -119.265936, water temperature at 19.0 degrees Celsius. The fish was caught using hook and line techniques that targeted bass. Two adult steelhead were caught and immediately released without further handling. Adipose fin missing from both fish. Fishing techniques used to collect the resident species were in accordance with the Washington Dept. of Fish and Wildlife (WDFW) freshwater fishing rules for the resident species of interest.

Snake River The resident fish from the Snake River serve as controls and were obtained by ENW personnel and fisherman donation.

One walleye obtained as a fisherman donation in July. Information provided by the fishermen indicated the fish was caught on 7/30/19 about 1/4 mile below Ice Harbor Dam. ENW personnel collected three small mouth bass on 7/28/19

Prepared by Energy Northwest Environmental Services, January 2020 from a location between the Hood Park and Ice Harbor Dam, GPS coordinates were recorded as 46.240879, -

118.954309.

Anadromous Species Collection The anadromous specie collected from the Snake and Columbia Rivers was Chinook salmon. Authorization to obtain the fish from local hatcheries was provided by the State of Washington Dept. of Fish and Wildlife in a letter dated 10/9/19.

The fish carcasses were obtained from both the Ringold and Lyons Ferry fish hatcheries on 10/22/19.

Fish Collection Summary Reasonable and prudent measures were utilized to minimize the impact of biological monitoring activities during 2019.

Fish collection was performed using hook and line techniques that targeted the species of interest; electroshock fishing was not performed. No capture or handling of Upper Columbia River (UCR) spring-run Chinook salmon or adult UCR steelhead occurred during the year.

Summary of Changes to CGS Aqueous Effluent Discharges During the 2019 calendar year, the NPDES effluent monitoring as reported on the monthly discharge monitoring reports indicated that all parameters were within permit specifications with no issues or violations. Additionally, whole effluent toxicity testing performed on a quarterly basis showed no statistically significant difference in survival between the control and the acute critical effluent concentration (ACEC, 11% effluent).

In 2019 CGS modified its existing batch halogenation process of the Circulating Water (CW) and Plant Service Water (TSW) systems. CGS added equipment to continuously halogenate the CW and TSW systems. Dehalogenation equipment was also installed to remove residual halogenation agents prior to discharging the Station's effluent to the Columbia River. This modification was made to improve the process that inhibits biological fouling of the CW and TSW systems. CGS worked with the Energy Facility Site Evaluation Council (EFSEC) and the Washington Department of Ecology (WDOE) to amend NPDES permit WA002515-1 for this change in operation. The new continuous halogenation/

dehalogenation system was start-up on November 6, 2019. Implementation of this new process has not resulted in any NPDES permit violations to date. CGS may continue to utilize the batch halogenation process on occassion.

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-032 DIC: 1316.20 DATE: February 13, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station JANUARY 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES PERMIT No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for January 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 February 13, 2019 Columbia Generating Station January 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Elisa Nguyen, Environmental Scientist, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 01/01/2019 - 01/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

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s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-T 1/1/19 2.7 8.2 8.3 22.6 1-W 1/2/19 1.1 8.2 8.3 0 22.3 <0.1 <0.1 1-Th 1/3/19 2.3 8.3 8.4 24.5 1-F 1/4/19 1.1 8.3 8.4 0 23.6 <0.1 <0.1 1-Sa 1/5/19 2.0 8.3 8.4 22.9 2-Su 1/6/19 2.0 8.1 8.4 23.4 2-M 1/7/19 0.6 8.1 8.2 0 22.6 <0.1 <0.1 2-T 1/8/19 2.6 8.1 8.2 23.2 6.3* 16* <1* 21*

2-W 1/9/19 0.8 8.2 8.4 0 21.4 <0.1 <0.1 2-Th 1/10/19 3.4 8.0 8.5 22.1 2-F 1/11/19 1.7 8.0 8.4 0 22.2 <0.1 <0.1 2-Sa 1/12/19 2.6 8.1 8.3 22.1 3-Su 1/13/19 2.6 8.2 8.2 20.6 3-M 1/14/19 0.8 8.2 8.3 0 20.7 <0.1 <0.1 3-T 1/15/19 2.3 8.3 8.4 22.1 3-W 1/16/19 0.8 8.3 8.5 0 22.0 <0.1 <0.1 3-Th 1/17/19 3.0 8.3 8.5 22.5 3-F 1/18/19 1.4 8.3 8.4 0 22.9 <0.1 <0.1 3-Sa 1/19/19 2.6 8.1 8.3 23.2 4-Su 1/20/19 2.6 8.2 8.2 22.9 4-M 1/21/19 1.3 8.1 8.3 0 22.6 <0.1 <0.1 4-T 1/22/19 2.5 8.1 8.4 21.9 4-W 1/23/19 0.7 8.2 8.3 0 20.3 <0.1 <0.1 4-Th 1/24/19 2.9 8.2 8.4 22.6 4-F 1/25/19 2.5 8.3 8.4 0 22.1 <0.1 <0.1 4-Sa 1/26/19 3.7 8.3 8.4 21.1 5-Su 1/27/19 2.5 8.3 8.4 21.2 5-M 1/28/19 0.9 8.3 8.4 0 21.0 <0.1 <0.1 5-T 1/29/19 1.8 8.3 8.4 22.5 5-W 1/30/19 0.7 8.3 8.4 0 21.4 <0.1 <0.1 5-Th 1/31/19 2.9 8.2 8.3 21.0 Instantaneous 8.0 Minimum >= 6.5 (RO) 2.0 <1 21 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.5 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

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1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-T 1/1/19 1-W 1/2/19 1-Th 1/3/19 1-F 1/4/19 1-Sa 1/5/19 2-Su 1/6/19 2-M 1/7/19 2-T 1/8/19 2-W 1/9/19 2-Th 1/10/19 2-F 1/11/19 2-Sa 1/12/19 3-Su 1/13/19 3-M 1/14/19 3-T 1/15/19 3-W 1/16/19 3-Th 1/17/19 3-F 1/18/19 3-Sa 1/19/19 4-Su 1/20/19 4-M 1/21/19 4-T 1/22/19 4-W 1/23/19 4-Th 1/24/19 4-F 1/25/19 4-Sa 1/26/19 5-Su 1/27/19 5-M 1/28/19 5-T 1/29/19 5-W 1/30/19 5-Th 1/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 1/8/2019 6.3 Results reported from a grab sample collected 1/8/2019 Measured NTU CWB Copper 1/8/2019 16 Results reported from a 24-hour composite sample Total collected 1/7/2019-1/8/2019 Micrograms/L (ug/L)

CWB Chromium 1/8/2019 Bl<1 Results reported from a 24-hour composite sample Total collected 1/7/2019-1/8/2019 Micrograms/L (ug/L)

CWB Zinc 1/8/2019 21 Results reported from a 24-hour composite sample Total collected 1/7/2019-1/8/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the SSW ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 01/01/2019 - 01/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-T 1/1/19 34681 1-W 1/2/19 34381 1-Th 1/3/19 48281 1-F 1/4/19 34481 1-Sa 1/5/19 48300 2-Su 1/6/19 34262 2-M 1/7/19 53181 2-T 1/8/19 37481 2-W 1/9/19 51381 2-Th 1/10/19 34481 2-F 1/11/19 21581 2-Sa 1/12/19 34504 3-Su 1/13/19 34454 3-M 1/14/19 34485 3-T 1/15/19 21581 3-W 1/16/19 47581 3-Th 1/17/19 34781 3-F 1/18/19 47181 3-Sa 1/19/19 34181 4-Su 1/20/19 34781 4-M 1/21/19 47081 4-T 1/22/19 37081 4-W 1/23/19 37481 4-Th 1/24/19 37781 4-F 1/25/19 21581 4-Sa 1/26/19 50781 5-Su 1/27/19 21581 5-M 1/28/19 47181 5-T 1/29/19 34081 5-W 1/30/19 60081 5-Th 1/31/19 21581 1172311 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 01/01/2019 - 01/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-T 1/1/19 20.6 1-W 1/2/19 19.1 1-Th 1/3/19 22.2 1-F 1/4/19 21.8 1-Sa 1/5/19 20.8 2-Su 1/6/19 22.0 2-M 1/7/19 19.9 2-T 1/8/19 20.6 2-W 1/9/19 19.1 2-Th 1/10/19 21.6 2-F 1/11/19 20.2 2-Sa 1/12/19 18.0 3-Su 1/13/19 20.1 3-M 1/14/19 18.5 3-T 1/15/19 20.3 3-W 1/16/19 19.2 3-Th 1/17/19 21.7 3-F 1/18/19 21.1 3-Sa 1/19/19 21.8 4-Su 1/20/19 21.3 4-M 1/21/19 19.6 4-T 1/22/19 15.2 4-W 1/23/19 14.8 4-Th 1/24/19 18.9 4-F 1/25/19 22.3 4-Sa 1/26/19 21.9 5-Su 1/27/19 21.0 5-M 1/28/19 18.9 5-T 1/29/19 19.7 5-W 1/30/19 18.4 5-Th 1/31/19 21.0 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Shannon Khounnala 2/12/2019 3:58:10 PM Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-047 DIC: 1316.20 DATE: March 14, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station FEBRUARY 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES PERMIT No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for February 2019. It should be noted that the February sample for metals analysis was collected as a grab sample instead of a 24-hour composite because the connection for a composite sample was not available due to tag-out conditions for another project. All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 March 14, 2019 Columbia Generating Station FEBRUARY 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 02/01/2019 - 02/28/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

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[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-F 2/1/19 1.3 8.2 8.2 0 21.1 <0.1 <0.1 1-Sa 2/2/19 2.3 8.2 8.2 22.4 2-Su 2/3/19 2.3 8.2 8.3 22.5 2-M 2/4/19 0.8 8.2 8.3 0 22.6 <0.1 <0.1 2-T 2/5/19 1.6 8.3 8.3 24.5 9.7* 14* 1.3* 20*

2-W 2/6/19 0.3 8.3 8.3 0 20.3 <0.1 <0.1 2-Th 2/7/19 3.0 8.2 8.3 24.7 2-F 2/8/19 1.4 8.3 8.4 0 27.3 <0.1 <0.1 2-Sa 2/9/19 2.0 8.3 8.4 27.5 3-Su 2/10/19 2.0 8.3 8.4 27.3 3-M 2/11/19 2.0 8.3 8.4 26.3 3-T 2/12/19 2.0 8.3 8.4 26.0 3-W 2/13/19 0.7 8.3 8.4 0 25.5 <0.1 <0.1 3-Th 2/14/19 3.0 8.3 8.4 27.9 3-F 2/15/19 1.2 8.3 8.4 0 25.9 <0.1 <0.1 3-Sa 2/16/19 2.7 8.3 8.4 24.8 4-Su 2/17/19 2.7 8.0 8.4 24.8 4-M 2/18/19 1.4 8.0 8.4 0 24.9 <0.1 <0.1 4-T 2/19/19 2.5 8.0 8.4 24.2 4-W 2/20/19 1.2 8.0 8.4 0 26.3 <0.1 <0.1 4-Th 2/21/19 2.7 8.0 8.4 26.3 4-F 2/22/19 1.2 8.0 8.4 0 25.6 <0.1 <0.1 4-Sa 2/23/19 2.0 8.1 8.4 26.3 5-Su 2/24/19 2.0 8.0 8.4 25.7 5-M 2/25/19 2.0 7.9 8.4 24.6 5-T 2/26/19 2.0 8.0 8.4 24.0 5-W 2/27/19 1.0 8.1 8.4 0 23.4 <0.1 <0.1 5-Th 2/28/19 2.3 8.1 8.4 24.8 Instantaneous 7.9 Minimum >= 6.5 (RO) 1.8 1.3 20 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.4 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 2/5/2019 9.7 Results reported from a grab sample collected 2/5/2019 Measured NTU

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-F 2/1/19 1-Sa 2/2/19 2-Su 2/3/19 2-M 2/4/19 2-T 2/5/19 2-W 2/6/19 2-Th 2/7/19 2-F 2/8/19 2-Sa 2/9/19 3-Su 2/10/19 3-M 2/11/19 3-T 2/12/19 3-W 2/13/19 3-Th 2/14/19 3-F 2/15/19 3-Sa 2/16/19 4-Su 2/17/19 4-M 2/18/19 4-T 2/19/19 4-W 2/20/19 4-Th 2/21/19 4-F 2/22/19 4-Sa 2/23/19 5-Su 2/24/19 5-M 2/25/19 5-T 2/26/19 5-W 2/27/19 5-Th 2/28/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 CWB Copper 2/5/2019 14 Results reported from a grab sample collected 2/5/2019 Total Micrograms/L (ug/L)

CWB Chromium 2/5/2019 1.3 Results reported from a grab sample collected 2/5/2019 Total Micrograms/L (ug/L)

CWB Zinc 2/5/2019 20 Results reported from a grab sample collected 2/5/2019 Total Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the SSW ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 02/01/2019 - 02/28/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-F 2/1/19 52818 1-Sa 2/2/19 52753 2-Su 2/3/19 40755 2-M 2/4/19 58346 2-T 2/5/19 42818 2-W 2/6/19 55718 2-Th 2/7/19 60218 2-F 2/8/19 39618 2-Sa 2/9/19 40218 3-Su 2/10/19 39918 3-M 2/11/19 40318 3-T 2/12/19 40118 3-W 2/13/19 26918 3-Th 2/14/19 51218 3-F 2/15/19 39418 3-Sa 2/16/19 52386 4-Su 2/17/19 26918 4-M 2/18/19 52249 4-T 2/19/19 52118 4-W 2/20/19 26918 4-Th 2/21/19 51518 4-F 2/22/19 39518 4-Sa 2/23/19 39218 5-Su 2/24/19 39418 5-M 2/25/19 210218 5-T 2/26/19 64118 5-W 2/27/19 39118 5-Th 2/28/19 39818 1414703 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 02/01/2019 - 02/28/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-F 2/1/19 19.3 1-Sa 2/2/19 20.7 2-Su 2/3/19 21.2 2-M 2/4/19 19.1 2-T 2/5/19 19.0 2-W 2/6/19 18.3 2-Th 2/7/19 19.8 2-F 2/8/19 19.1 2-Sa 2/9/19 20.3 3-Su 2/10/19 20.0 3-M 2/11/19 19.7 3-T 2/12/19 19.8 3-W 2/13/19 19.1 3-Th 2/14/19 21.8 3-F 2/15/19 19.6 3-Sa 2/16/19 20.9 4-Su 2/17/19 21.2 4-M 2/18/19 19.4 4-T 2/19/19 20.4 4-W 2/20/19 19.7 4-Th 2/21/19 21.2 4-F 2/22/19 19.4 4-Sa 2/23/19 20.1 5-Su 2/24/19 20.2 5-M 2/25/19 20.0 5-T 2/26/19 20.4 5-W 2/27/19 19.1 5-Th 2/28/19 20.0 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-071 DIC: 1316.20 DATE: April 11, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station MARCH 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES PERMIT No. WA002515, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for March 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 April 11, 2019 Columbia Generating Station MARCH 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 03/01/2019 - 03/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-F 3/1/19 0.3 8.2 8.3 0 23.3 <0.1 <0.1 1-Sa 3/2/19 1.0 8.0 8.4 24.2 2-Su 3/3/19 1.9 7.8 8.4 26.7 1.8* 10* <1* 18*

2-M 3/4/19 1.2 7.7 8.4 0 28.5 <0.1 <0.1 2-T 3/5/19 2.4 7.7 8.4 27.9 2-W 3/6/19 0.7 8.2 8.4 0 27.3 <0.1 <0.1 2-Th 3/7/19 2.2 7.9 8.4 28.0 2-F 3/8/19 1.0 7.9 8.4 0 24.7 <0.1 <0.1 2-Sa 3/9/19 2.1 7.9 8.4 26.8 3-Su 3/10/19 2.1 8.0 8.4 26.9 3-M 3/11/19 2.1 7.9 8.4 26.9 3-T 3/12/19 2.2 7.9 8.4 30.2 3-W 3/13/19 1.3 8.0 8.4 0 27.0 <0.1 <0.1 3-Th 3/14/19 2.5 8.0 8.4 27.1 3-F 3/15/19 1.2 8.0 8.4 0 25.7 <0.1 <0.1 3-Sa 3/16/19 2.4 8.1 8.4 24.8 4-Su 3/17/19 2.4 8.0 8.4 25.7 4-M 3/18/19 0.8 8.3 8.4 0 25.7 <0.1 <0.1 4-T 3/19/19 2.5 8.0 8.4 26.4 4-W 3/20/19 0.8 8.3 8.4 0 26.4 <0.1 <0.1 4-Th 3/21/19 2.3 8.0 8.4 25.8 4-F 3/22/19 1.2 8.0 8.4 0 25.7 <0.1 <0.1 4-Sa 3/23/19 2.2 8.0 8.4 25.1 5-Su 3/24/19 2.3 8.0 8.4 25.2 5-M 3/25/19 0.6 8.3 8.4 0 25.9 <0.1 <0.1 5-T 3/26/19 3.2 8.0 8.4 25.6 5-W 3/27/19 1.0 8.3 8.4 24.8 5-Th 3/28/19 3.9 8.0 8.4 25.3 5-F 3/29/19 4.2 8.0 8.4 25.5 5-Sa 3/30/19 4.3 7.9 8.4 25.1 6-Su 3/31/19 4.2 8.0 8.4 25.5 Instantaneous 7.7 Minimum >= 6.5 (RO) 2.0 <1 18 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.4 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-F 3/1/19 1-Sa 3/2/19 2-Su 3/3/19 2-M 3/4/19 2-T 3/5/19 2-W 3/6/19 2-Th 3/7/19 2-F 3/8/19 2-Sa 3/9/19 3-Su 3/10/19 3-M 3/11/19 3-T 3/12/19 3-W 3/13/19 3-Th 3/14/19 3-F 3/15/19 3-Sa 3/16/19 4-Su 3/17/19 4-M 3/18/19 4-T 3/19/19 4-W 3/20/19 4-Th 3/21/19 4-F 3/22/19 4-Sa 3/23/19 5-Su 3/24/19 5-M 3/25/19 5-T 3/26/19 5-W 3/27/19 5-Th 3/28/19 5-F 3/29/19 5-Sa 3/30/19 6-Su 3/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 3/3/2019 1.8 Results reported from a grab sample collected 3/3/2019 Measured NTU CWB Copper 3/3/2019 10 Results reported from a 24-hr composite sample collected Total 3/2/2019-3/3/2019 Micrograms/L (ug/L)

CWB Chromium 3/3/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 3/2/2019-3/3/2019 Micrograms/L (ug/L)

CWB Zinc 3/3/2019 18 Results reported from a 24-hr composite sample collected Total 3/2/2019-3/3/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 03/01/2019 - 03/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-F 3/1/19 40037 1-Sa 3/2/19 40237 2-Su 3/3/19 39937 2-M 3/4/19 65837 2-T 3/5/19 53037 2-W 3/6/19 65737 2-Th 3/7/19 52137 2-F 3/8/19 27537 2-Sa 3/9/19 52537 3-Su 3/10/19 40137 3-M 3/11/19 34237 3-T 3/12/19 33537 3-W 3/13/19 27537 3-Th 3/14/19 27537 3-F 3/15/19 39937 3-Sa 3/16/19 27537 4-Su 3/17/19 59137 4-M 3/18/19 27537 4-T 3/19/19 40237 4-W 3/20/19 27537 4-Th 3/21/19 52637 4-F 3/22/19 27537 4-Sa 3/23/19 40561 5-Su 3/24/19 27537 5-M 3/25/19 27537 5-T 3/26/19 27537 5-W 3/27/19 27537 5-Th 3/28/19 70937 5-F 3/29/19 58837 5-Sa 3/30/19 28137 6-Su 3/31/19 43537 1254271 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 03/01/2019 - 03/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-F 3/1/19 17.9 1-Sa 3/2/19 18.1 2-Su 3/3/19 20.7 2-M 3/4/19 18.7 2-T 3/5/19 19.9 2-W 3/6/19 18.8 2-Th 3/7/19 21.6 2-F 3/8/19 19.2 2-Sa 3/9/19 20.9 3-Su 3/10/19 20.7 3-M 3/11/19 20.7 3-T 3/12/19 21.2 3-W 3/13/19 21.6 3-Th 3/14/19 22.0 3-F 3/15/19 20.4 3-Sa 3/16/19 21.8 4-Su 3/17/19 22.1 4-M 3/18/19 20.6 4-T 3/19/19 23.2 4-W 3/20/19 22.1 4-Th 3/21/19 24.0 4-F 3/22/19 23.2 4-Sa 3/23/19 24.1 5-Su 3/24/19 23.5 5-M 3/25/19 20.7 5-T 3/26/19 21.1 5-W 3/27/19 21.1 5-Th 3/28/19 21.1 5-F 3/29/19 23.7 5-Sa 3/30/19 26.2 6-Su 3/31/19 26.6 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

INTEROFFICE MEMO GO2-19-083 DIC: 1316.20 DATE: May 13, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station APRIL 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES PERMIT No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for April 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. However, the blowdown flow recorder (CBD-FR-10) failed on 4/27/2019 and manual logs of the alternate flow indication were used for the remainder of the month.

The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 May 13, 2019 Columbia Generating Station APRIL 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 04/01/2019 - 04/30/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-M 4/1/19 1.0 8.3 8.4 0 24.8 <0.1 <0.1 1-T 4/2/19 2.2 8.0 8.4 25.1 5.1* 12* <1* 16*

1-W 4/3/19 1.3 8.1 8.4 0 25.1 <0.1 <0.1 1-Th 4/4/19 0.6 8.3 8.4 25.3 1-F 4/5/19 1.5 8.1 8.4 0 26.1 <0.1 <0.1 1-Sa 4/6/19 4.8 8.1 8.4 26.6 2-Su 4/7/19 4.8 8.1 8.4 28.0 2-M 4/8/19 1.1 8.3 8.3 0 27.6 <0.1 <0.1 2-T 4/9/19 2.0 8.2 8.4 26.3 2-W 4/10/19 0.5 8.3 8.4 0 27.1 <0.1 <0.1 2-Th 4/11/19 2.9 8.2 8.3 25.1 2-F 4/12/19 1.4 8.2 8.3 0 24.9 <0.1 <0.1 2-Sa 4/13/19 2.6 8.2 8.3 26.0 3-Su 4/14/19 2.6 8.2 8.3 25.9 3-M 4/15/19 1.0 8.3 8.4 0 24.3 <0.1 <0.1 3-T 4/16/19 3.1 8.2 8.4 25.4 3-W 4/17/19 1.0 8.3 8.3 0 25.4 <0.1 <0.1 3-Th 4/18/19 2.8 8.2 8.4 28.1 3-F 4/19/19 1.3 8.2 8.3 0 28.2 <0.1 <0.1 3-Sa 4/20/19 2.5 8.2 8.3 26.3 4-Su 4/21/19 2.5 8.2 8.3 24.6 4-M 4/22/19 0.7 8.3 8.3 0 24.8 <0.1 <0.1 4-T 4/23/19 3.2 8.2 8.3 27.9 4-W 4/24/19 1.0 8.3 8.3 0 27.1 <0.1 <0.1 4-Th 4/25/19 3.1 8.2 8.3 24.8 4-F 4/26/19 0.5 8.3 8.3 24.7 4-Sa 4/27/19 2.5 8.2 8.3 0 25.1 <0.1 <0.1 5-Su 4/28/19 2.9 8.2 8.3 24.2 5-M 4/29/19 0.7 8.3 8.3 0 22.8 <0.1 <0.1 5-T 4/30/19 2.9 8.3 8.3 23.9 Instantaneous 8.0 Minimum >= 6.5 (RO) 2.0 <1 16 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.4 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-M 4/1/19 1-T 4/2/19 1-W 4/3/19 1-Th 4/4/19 1-F 4/5/19 1-Sa 4/6/19 2-Su 4/7/19 2-M 4/8/19 2-T 4/9/19 2-W 4/10/19 2-Th 4/11/19 2-F 4/12/19 2-Sa 4/13/19 3-Su 4/14/19 3-M 4/15/19 3-T 4/16/19 3-W 4/17/19 3-Th 4/18/19 3-F 4/19/19 3-Sa 4/20/19 4-Su 4/21/19 4-M 4/22/19 4-T 4/23/19 4-W 4/24/19 4-Th 4/25/19 4-F 4/26/19 4-Sa 4/27/19 5-Su 4/28/19 5-M 4/29/19 5-T 4/30/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 4/2/2019 5.1 Results reported from a grab sample collected 4/2/2019 Measured NTU CWB Copper 4/2/2019 12 Results reported from a 24-hr composite sample collected Total 4/1/2019-4/2/2019 Micrograms/L (ug/L)

CWB Chromium 4/2/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 4/1/2019-4/2/2019 Micrograms/L (ug/L)

CWB Zinc 4/2/2019 16 Results reported from a 24-hr composite sample collected Total 4/1/2019-4/2/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 04/01/2019 - 04/30/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-M 4/1/19 31122 1-T 4/2/19 32222 1-W 4/3/19 29622 1-Th 4/4/19 16022 1-F 4/5/19 16022 1-Sa 4/6/19 42322 2-Su 4/7/19 16022 2-M 4/8/19 29022 2-T 4/9/19 48022 2-W 4/10/19 42122 2-Th 4/11/19 29422 2-F 4/12/19 28622 2-Sa 4/13/19 16022 3-Su 4/14/19 28422 3-M 4/15/19 16022 3-T 4/16/19 28122 3-W 4/17/19 28322 3-Th 4/18/19 41622 3-F 4/19/19 28622 3-Sa 4/20/19 16022 4-Su 4/21/19 16022 4-M 4/22/19 16022 4-T 4/23/19 28898 4-W 4/24/19 28351 4-Th 4/25/19 28722 4-F 4/26/19 16022 4-Sa 4/27/19 28578 5-Su 4/28/19 28507 5-M 4/29/19 28481 5-T 4/30/19 28322 811665 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 04/01/2019 - 04/30/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-M 4/1/19 23.2 1-T 4/2/19 25.1 1-W 4/3/19 24.0 1-Th 4/4/19 22.5 1-F 4/5/19 25.3 1-Sa 4/6/19 26.7 2-Su 4/7/19 26.1 2-M 4/8/19 21.5 2-T 4/9/19 24.6 2-W 4/10/19 22.5 2-Th 4/11/19 24.9 2-F 4/12/19 23.2 2-Sa 4/13/19 24.2 3-Su 4/14/19 24.2 3-M 4/15/19 22.6 3-T 4/16/19 25.5 3-W 4/17/19 23.8 3-Th 4/18/19 26.2 3-F 4/19/19 25.2 3-Sa 4/20/19 25.2 4-Su 4/21/19 24.9 4-M 4/22/19 23.1 4-T 4/23/19 26.1 4-W 4/24/19 23.6 4-Th 4/25/19 25.4 4-F 4/26/19 23.4 4-Sa 4/27/19 24.4 5-Su 4/28/19 24.4 5-M 4/29/19 21.9 5-T 4/30/19 25.0 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-094 DIC: 1316.20 DATE: June 12, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station MAY 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES PERMIT No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for May 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. However, alternate flow records were used throughout the month due to instrumentation issues and refueling outage R24. The blowdown flow recorder (CBD-FR-10) was out of service during the first half of the month therefore CBD-FI-1A manual logs were used. Additionally, during the maintenance outage, a temporary digital flow meter and ultrasonic flow meter with manual logs were used.

The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 June 12, 2019 Columbia Generating Station MAY 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 05/01/2019 - 05/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-W 5/1/19 0.9 8.3 8.4 0 23.8 <0.1 <0.1 1-Th 5/2/19 2.7 8.3 8.4 25.7 1-F 5/3/19 2.7 8.3 8.3 25.6 1-Sa 5/4/19 2.7 8.3 8.3 26.2 2-Su 5/5/19 2.6 8.3 8.3 26.6 2-M 5/6/19 0.5 8.3 8.3 26.1 2-T 5/7/19 2.0 8.3 8.3 0 26.4 2.9* 12* <1* 12* <0.1 <0.1 2-W 5/8/19 0.8 8.3 8.3 26.3 2-Th 5/9/19 3.0 8.3 8.4 0 26.1 <0.1 <0.1 2-F 5/10/19 3.3 8.3 8.4 27.9 2-Sa 5/11/19 3.1 7.8 8.3 28.5 3-Su 5/12/19 0.9 7.7 8.1 20.1 3-M 5/13/19 0.9 8.0 8.1 20.6 3-T 5/14/19 2.9 7.9 8.1 18.8 3-W 5/15/19 3.3 7.8 7.9 20.5 3-Th 5/16/19 3.4 7.7 7.9 24.3 3-F 5/17/19 1.7 7.7 7.9 22.8 3-Sa 5/18/19 2.4 7.7 8.3 24.6 4-Su 5/19/19 2.5 7.8 7.9 23.3 4-M 5/20/19 2.0 7.9 8.0 22.8 4-T 5/21/19 2.3 7.9 7.9 22.7 4-W 5/22/19 2.3 7.6 7.9 22.3 4-Th 5/23/19 2.3 7.8 7.9 22.6 4-F 5/24/19 2.2 7.9 7.9 22.6 4-Sa 5/25/19 2.2 8.0 8.0 22.2 5-Su 5/26/19 2.2 8.0 8.0 22.1 5-M 5/27/19 2.3 7.9 7.9 22.7 5-T 5/28/19 2.3 7.9 7.9 23.4 5-W 5/29/19 2.3 7.9 7.9 23.9 5-Th 5/30/19 2.3 7.8 8.0 24.8 5-F 5/31/19 2.3 7.8 7.9 26.3 Instantaneous 7.6 Minimum >= 6.5 (RO) 2.2 <1 12 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.4 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-W 5/1/19 1-Th 5/2/19 1-F 5/3/19 1-Sa 5/4/19 2-Su 5/5/19 2-M 5/6/19 2-T 5/7/19 2-W 5/8/19 2-Th 5/9/19 2-F 5/10/19 2-Sa 5/11/19 3-Su 5/12/19 3-M 5/13/19 3-T 5/14/19 3-W 5/15/19 3-Th 5/16/19 3-F 5/17/19 3-Sa 5/18/19 4-Su 5/19/19 4-M 5/20/19 4-T 5/21/19 4-W 5/22/19 4-Th 5/23/19 4-F 5/24/19 4-Sa 5/25/19 5-Su 5/26/19 5-M 5/27/19 5-T 5/28/19 5-W 5/29/19 5-Th 5/30/19 5-F 5/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 5/7/2019 2.9 Results reported from a grab sample collected 5/7/2019 Measured NTU CWB Copper 5/7/2019 12 Results reported from a 24-hr composite sample collected Total 5/6/2019-5/7/2019 Micrograms/L (ug/L)

CWB Chromium 5/7/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 5/6/2019-5/7/2019 Micrograms/L (ug/L)

CWB Zinc 5/7/2019 12 Results reported from a 24-hr composite sample collected Total 5/6/2019-5/7/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 05/01/2019 - 05/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-W 5/1/19 36182 1-Th 5/2/19 23482 1-F 5/3/19 35782 1-Sa 5/4/19 36482 2-Su 5/5/19 36282 2-M 5/6/19 23482 2-T 5/7/19 36182 2-W 5/8/19 36382 2-Th 5/9/19 23482 2-F 5/10/19 36182 2-Sa 5/11/19 36082 3-Su 5/12/19 36182 3-M 5/13/19 36282 3-T 5/14/19 113432 3-W 5/15/19 38782 3-Th 5/16/19 27782 3-F 5/17/19 32782 3-Sa 5/18/19 23482 4-Su 5/19/19 23482 4-M 5/20/19 23482 4-T 5/21/19 23482 4-W 5/22/19 23482 4-Th 5/23/19 23482 4-F 5/24/19 36482 4-Sa 5/25/19 23482 5-Su 5/26/19 23482 5-M 5/27/19 23482 5-T 5/28/19 23482 5-W 5/29/19 23482 5-Th 5/30/19 38982 5-F 5/31/19 39382 1018392 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 05/01/2019 - 05/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-W 5/1/19 22.9 1-Th 5/2/19 25.2 1-F 5/3/19 24.7 1-Sa 5/4/19 25.1 2-Su 5/5/19 25.9 2-M 5/6/19 23.2 2-T 5/7/19 25.6 2-W 5/8/19 23.5 2-Th 5/9/19 23.8 2-F 5/10/19 21.6 2-Sa 5/11/19 6.7 3-Su 5/12/19 5.8 3-M 5/13/19 5.8 3-T 5/14/19 5.8 3-W 5/15/19 4.8 3-Th 5/16/19 0.0 3-F 5/17/19 5.8 3-Sa 5/18/19 5.8 4-Su 5/19/19 5.8 4-M 5/20/19 5.8 4-T 5/21/19 5.8 4-W 5/22/19 5.8 4-Th 5/23/19 5.8 4-F 5/24/19 5.8 4-Sa 5/25/19 5.8 5-Su 5/26/19 5.8 5-M 5/27/19 5.8 5-T 5/28/19 5.8 5-W 5/29/19 5.8 5-Th 5/30/19 5.8 5-F 5/31/19 5.8 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-106 DIC: 1316.20 DATE: July 11, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station JUNE 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for June 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. However, alternate flow records were used due to refueling outage R24. A temporary digital flow meter and CBD-FI-1A manual logs were used during the maintenance outage and for initial startup after outage.

The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com CGS Plant Files (DIC 1316.20)

Page 2 of 2 July 11, 2019 Columbia Generating Station JUNE 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 06/01/2019 - 06/30/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Sa 6/1/19 2.3 7.8 7.9 26.7 2-Su 6/2/19 2.3 7.8 7.9 26.9 2-M 6/3/19 2.2 7.8 7.9 26.8 2-T 6/4/19 1.7 7.7 7.9 26.7 2-W 6/5/19 1.4 7.9 7.9 27.0 2-Th 6/6/19 1.7 7.9 7.9 28.2 2-F 6/7/19 2.2 7.8 7.9 28.0 2-Sa 6/8/19 2.0 7.9 8.0 26.8 3-Su 6/9/19 1.9 7.9 7.9 28.0 3-M 6/10/19 2.2 7.8 8.0 27.8 3-T 6/11/19 1.8 7.7 8.2 27.7 3-W 6/12/19 2.7 8.1 8.3 20.5 3-Th 6/13/19 2.7 7.8 8.3 21.7 3-F 6/14/19 2.7 8.1 8.2 20.3 3-Sa 6/15/19 2.8 7.6 8.4 18.3 4-Su 6/16/19 3.9 7.7 8.4 21.3 4-M 6/17/19 4.3 7.8 8.3 21.7 4-T 6/18/19 4.3 7.5 8.4 26.4 4-W 6/19/19 4.5 7.1 8.0 32.5 4-Th 6/20/19 4.5 7.3 7.7 35.3 2* 12* <1* 15*

4-F 6/21/19 4.4 7.4 7.9 34.1 4-Sa 6/22/19 4.1 7.8 8.3 29.7 5-Su 6/23/19 4.1 8.2 8.5 29.8 5-M 6/24/19 0.9 8.0 8.5 0 29.7 <0.1 <0.1 5-T 6/25/19 1.6 7.7 8.3 27.9 5-W 6/26/19 1.7 8.1 8.3 29.3 5-Th 6/27/19 2.1 8.0 8.3 30.3 5-F 6/28/19 0.8 7.7 8.3 0 29 <0.1 <0.1 5-Sa 6/29/19 1.5 8.1 8.3 28.3 6-Su 6/30/19 1.5 7.4 8.2 29.1 Instantaneous 7.1 Minimum >= 6.5 (RO) 2.6 <1 15 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.5 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-Sa 6/1/19 2-Su 6/2/19 2-M 6/3/19 2-T 6/4/19 2-W 6/5/19 2-Th 6/6/19 2-F 6/7/19 2-Sa 6/8/19 3-Su 6/9/19 3-M 6/10/19 3-T 6/11/19 3-W 6/12/19 3-Th 6/13/19 3-F 6/14/19 3-Sa 6/15/19 4-Su 6/16/19 4-M 6/17/19 4-T 6/18/19 4-W 6/19/19 4-Th 6/20/19 4-F 6/21/19 4-Sa 6/22/19 5-Su 6/23/19 5-M 6/24/19 5-T 6/25/19 5-W 6/26/19 5-Th 6/27/19 5-F 6/28/19 5-Sa 6/29/19 6-Su 6/30/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 6/20/2019 2 Results reported from a grab sample collected 6/19/2019 Measured NTU CWB Copper 6/20/2019 12 Results reported from a 24-hr composite sample collected Total 6/19/2019-6/20/2019 Micrograms/L (ug/L)

CWB Chromium 6/20/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 6/19/2019-6/20/2019 Micrograms/L (ug/L)

CWB Zinc 6/20/2019 15 Results reported from a 24-hr composite sample collected Total 6/19/2019-6/20/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 06/01/2019 - 06/30/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Sa 6/1/19 51210 2-Su 6/2/19 35810 2-M 6/3/19 51610 2-T 6/4/19 35710 2-W 6/5/19 35910 2-Th 6/6/19 35710 2-F 6/7/19 35910 2-Sa 6/8/19 35710 3-Su 6/9/19 35910 3-M 6/10/19 35510 3-T 6/11/19 20010 3-W 6/12/19 51610 3-Th 6/13/19 33010 3-F 6/14/19 35910 3-Sa 6/15/19 20010 4-Su 6/16/19 20010 4-M 6/17/19 35810 4-T 6/18/19 20010 4-W 6/19/19 20010 4-Th 6/20/19 20010 4-F 6/21/19 20010 4-Sa 6/22/19 20010 5-Su 6/23/19 20010 5-M 6/24/19 20010 5-T 6/25/19 20010 5-W 6/26/19 20010 5-Th 6/27/19 20010 5-F 6/28/19 20010 5-Sa 6/29/19 20010 6-Su 6/30/19 20010 865500 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 06/01/2019 - 06/30/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-Sa 6/1/19 5.8 2-Su 6/2/19 5.8 2-M 6/3/19 5.8 2-T 6/4/19 5.8 2-W 6/5/19 5.8 2-Th 6/6/19 5.8 2-F 6/7/19 5.8 2-Sa 6/8/19 5.8 3-Su 6/9/19 5.8 3-M 6/10/19 5.8 3-T 6/11/19 8.4 3-W 6/12/19 5.5 3-Th 6/13/19 5.6 3-F 6/14/19 5.7 3-Sa 6/15/19 5.7 4-Su 6/16/19 5.8 4-M 6/17/19 6.1 4-T 6/18/19 8.1 4-W 6/19/19 9.5 4-Th 6/20/19 11.3 4-F 6/21/19 18.0 4-Sa 6/22/19 25.2 5-Su 6/23/19 25.6 5-M 6/24/19 24.2 5-T 6/25/19 25.3 5-W 6/26/19 24.5 5-Th 6/27/19 25.2 5-F 6/28/19 24.2 5-Sa 6/29/19 24.6 6-Su 6/30/19 26.3 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

INTEROFFICE MEMO GO2-19-117 DIC: 1316.20 DATE: August 13, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station JULY 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for July 2019.

All monitoring parameters were within permit specifications for the month with no issues of concern. Grab samples for pH were conducted during the last week of the month due to issues with the continuous pH meter.

The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Page 2 of 2 August 13, 2019 Columbia Generating Station JULY 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 07/01/2019 - 07/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-M 7/1/19 0.5 8.2 8.3 0 29.4 <0.1 <0.1 1-T 7/2/19 3.0 8.0 8.3 30.9 1.4* 17* 1.5* 34*

1-W 7/3/19 1.0 8.2 8.3 0 30.8 <0.1 <0.1 1-Th 7/4/19 2.9 8.1 8.3 30.7 1-F 7/5/19 1.0 8.2 8.3 0 30.7 <0.1 <0.1 1-Sa 7/6/19 4.3 8.2 8.3 31.4 2-Su 7/7/19 4.3 8.0 8.3 31.0 2-M 7/8/19 1.3 8.1 8.3 0 28.9 <0.1 <0.1 2-T 7/9/19 4.3 7.8 8.3 30.7 2-W 7/10/19 0.9 8.2 8.3 0 31.0 <0.1 <0.1 2-Th 7/11/19 2.0 7.8 8.2 31.4 2-F 7/12/19 1.3 8.1 8.2 0 31.6 <0.1 <0.1 2-Sa 7/13/19 2.2 7.8 8.2 31.7 3-Su 7/14/19 2.2 8.1 8.2 31.8 3-M 7/15/19 0.7 8.1 8.2 0 30.9 <0.1 <0.1 3-T 7/16/19 2.8 7.9 8.2 31.1 3-W 7/17/19 1.1 8.0 8.2 0 31.1 <0.1 <0.1 3-Th 7/18/19 4.1 7.9 8.2 31.6 3-F 7/19/19 1.4 8.0 8.2 0 30.9 <0.1 <0.1 3-Sa 7/20/19 1.9 7.8 8.3 29.7 4-Su 7/21/19 1.9 8.2 8.3 30.3 4-M 7/22/19 1.1 8.2 8.3 0 31.9 <0.1 <0.1 4-T 7/23/19 2.6 8.2 8.3 32.4 4-W 7/24/19 1.4 8.2 8.3 0 32.5 <0.1 <0.1 4-Th 7/25/19 3.3 8.2 8.3 31.3 4-F 7/26/19 2.2 8.1 8.3 32.0 4-Sa 7/27/19 3.3 8.1 8.3 32.2 5-Su 7/28/19 3.3 8.1 8.3 31.8 5-M 7/29/19 0.8 8.2 8.2 0 31.2 <0.1 <0.1 5-T 7/30/19 2.5 8.3 8.4 31.6 5-W 7/31/19 0.9 8.3 8.3 0 31.6 <0.1 <0.1 Instantaneous 7.8 Minimum >= 6.5 (RO) 2.14516 1.5 34 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.4 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-M 7/1/19 1-T 7/2/19 1-W 7/3/19 1-Th 7/4/19 1-F 7/5/19 1-Sa 7/6/19 2-Su 7/7/19 2-M 7/8/19 2-T 7/9/19 2-W 7/10/19 2-Th 7/11/19 2-F 7/12/19 2-Sa 7/13/19 3-Su 7/14/19 3-M 7/15/19 3-T 7/16/19 3-W 7/17/19 3-Th 7/18/19 3-F 7/19/19 3-Sa 7/20/19 4-Su 7/21/19 4-M 7/22/19 4-T 7/23/19 4-W 7/24/19 4-Th 7/25/19 4-F 7/26/19 4-Sa 7/27/19 5-Su 7/28/19 5-M 7/29/19 5-T 7/30/19 5-W 7/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 7/2/2019 1.4 Results reported from a grab sample collected 7/2/19 Measured NTU CWB Copper 7/2/2019 17 Results reported from a 24-hr composite sample collected Total 7/1/2019-7/2/2019 Micrograms/L (ug/L)

CWB Chromium 7/2/2019 1.5 Results reported from a 24-hr composite sample collected Total 7/1/2019-7/2/2019 Micrograms/L (ug/L)

CWB Zinc 7/2/2019 34 Results reported from a 24-hr composite sample collected Total 7/1/2019-7/2/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 07/01/2019 - 07/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-M 7/1/19 17157 1-T 7/2/19 32557 1-W 7/3/19 33157 1-Th 7/4/19 17157 1-F 7/5/19 33257 1-Sa 7/6/19 32657 2-Su 7/7/19 33157 2-M 7/8/19 17157 2-T 7/9/19 33457 2-W 7/10/19 32757 2-Th 7/11/19 17157 2-F 7/12/19 30357 2-Sa 7/13/19 32957 3-Su 7/14/19 32957 3-M 7/15/19 32957 3-T 7/16/19 17157 3-W 7/17/19 32357 3-Th 7/18/19 32757 3-F 7/19/19 32757 3-Sa 7/20/19 33357 4-Su 7/21/19 17157 4-M 7/22/19 32740 4-T 7/23/19 17157 4-W 7/24/19 32757 4-Th 7/25/19 33457 4-F 7/26/19 17157 4-Sa 7/27/19 33457 5-Su 7/28/19 17157 5-M 7/29/19 33257 5-T 7/30/19 17157 5-W 7/31/19 17157 845850 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 07/01/2019 - 07/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-M 7/1/19 25.2 1-T 7/2/19 27.4 1-W 7/3/19 25.8 1-Th 7/4/19 28.9 1-F 7/5/19 26.5 1-Sa 7/6/19 30.0 2-Su 7/7/19 22.6 2-M 7/8/19 21.9 2-T 7/9/19 29.3 2-W 7/10/19 26.2 2-Th 7/11/19 26.8 2-F 7/12/19 26.6 2-Sa 7/13/19 28.1 3-Su 7/14/19 27.7 3-M 7/15/19 25.8 3-T 7/16/19 28.1 3-W 7/17/19 26.2 3-Th 7/18/19 28.8 3-F 7/19/19 25.5 3-Sa 7/20/19 26.7 4-Su 7/21/19 27.4 4-M 7/22/19 26.9 4-T 7/23/19 28.7 4-W 7/24/19 25.9 4-Th 7/25/19 27.8 4-F 7/26/19 27.4 4-Sa 7/27/19 28.1 5-Su 7/28/19 27.7 5-M 7/29/19 25.3 5-T 7/30/19 27.0 5-W 7/31/19 25.3 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-134 DIC: 1316.20 DATE: September 12, 2019 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station AUGUST 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for August 2019. All monitoring parameters were within permit specifications for the month with no issues of concern. The data source for the circulating water blowdown pH was changed to the monitor located in the dehalogenation trailer, which is downstream of the dehalogenation system. This change was due in-part to issues with the existing continuous pH meter and in preparation for the planned start-up of the continuous halogenation and dehalogenation process. Calibration of the new pH location was verified prior to placing the new pH probe into service. Additionally, because of erratic response from the blowdown flowmeter during the last week of August, manual readings from the alternate flow meter (CBD-FI-1A) were used.

The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Columbia Generating Station Page 2 of 2 September 12, 2019 Columbia Generating Station AUGUST 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: Conner Holbrook, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 08/01/2019 - 08/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

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s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Th 8/1/19 4.3 8.0 8.3 32.2 1-F 8/2/19 2.8 8.2 8.4 0 32.9 <0.1 <0.1 1-Sa 8/3/19 4.4 8.3 8.5 32.5 2-Su 8/4/19 4.4 8.1 8.5 31.3 2-M 8/5/19 1.4 7.8 8.3 0 31.3 <0.1 <0.1 2-T 8/6/19 4.2 7.7 8.5 32.7 2.5* 11* <1* 12*

2-W 8/7/19 1.8 8.3 8.7 0 32.3 <0.1 <0.1 2-Th 8/8/19 4.2 8.3 8.5 32.8 2-F 8/9/19 2.2 8.2 8.5 0 32.7 <0.1 <0.1 2-Sa 8/10/19 5.3 8.3 8.5 32.8 3-Su 8/11/19 5.3 8.4 8.5 32.1 3-M 8/12/19 1.5 8.4 8.5 0 31.0 <0.1 <0.1 3-T 8/13/19 1.8 8.1 8.7 30.7 3-W 8/14/19 2.1 8.1 8.5 0 32.3 <0.1 <0.1 3-Th 8/15/19 4.3 8.0 8.4 31.8 3-F 8/16/19 2.5 7.9 8.4 0 31.6 <0.1 <0.1 3-Sa 8/17/19 4.2 8.2 8.5 31.2 4-Su 8/18/19 4.2 8.1 8.4 31.8 4-M 8/19/19 2.2 7.9 8.6 0 32.0 <0.1 <0.1 4-T 8/20/19 4.5 7.9 8.6 31.6 4-W 8/21/19 2.1 8.3 8.4 0 32.8 <0.1 <0.1 4-Th 8/22/19 4.2 8.3 8.4 31.8 4-F 8/23/19 1.2 8.3 8.4 0 31.0 <0.1 <0.1 4-Sa 8/24/19 4.4 8.1 8.5 31.4 5-Su 8/25/19 4.4 8.3 8.4 31.2 5-M 8/26/19 2.1 8.2 8.4 0 30.4 <0.1 <0.1 5-T 8/27/19 4.1 7.8 8.4 31.4 5-W 8/28/19 2.1 8.0 8.4 0 32.2 <0.1 <0.1 5-Th 8/29/19 4.0 8.1 8.4 33.7 5-F 8/30/19 2.9 8.2 8.4 0 34.5 <0.1 <0.1 5-Sa 8/31/19 3.9 8.2 8.5 33.9 Instantaneous 7.7 Minimum >= 6.5 (RO) 3.3 <1 12 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.7 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-Th 8/1/19 1-F 8/2/19 1-Sa 8/3/19 2-Su 8/4/19 2-M 8/5/19 2-T 8/6/19 2-W 8/7/19 2-Th 8/8/19 2-F 8/9/19 2-Sa 8/10/19 3-Su 8/11/19 3-M 8/12/19 3-T 8/13/19 3-W 8/14/19 3-Th 8/15/19 3-F 8/16/19 3-Sa 8/17/19 4-Su 8/18/19 4-M 8/19/19 4-T 8/20/19 4-W 8/21/19 4-Th 8/22/19 4-F 8/23/19 4-Sa 8/24/19 5-Su 8/25/19 5-M 8/26/19 5-T 8/27/19 5-W 8/28/19 5-Th 8/29/19 5-F 8/30/19 5-Sa 8/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 8/6/2019 2.5 Results reported from a grab sample collected 8/6/2019 Measured NTU CWB Copper 8/6/2019 11 Results reported from a 24-hr composite sample collected Total 8/5/2019-8/6/2019 Micrograms/L (ug/L)

CWB Chromium 8/6/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 8/5/2019-8/6/2019 Micrograms/L (ug/L)

CWB Zinc 8/6/2019 12 Results reported from a 24-hr composite sample collected Total 8/5/2019-8/6/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 08/01/2019 - 08/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Th 8/1/19 29144 1-F 8/2/19 13044 1-Sa 8/3/19 44944 2-Su 8/4/19 13044 2-M 8/5/19 13044 2-T 8/6/19 28844 2-W 8/7/19 29244 2-Th 8/8/19 13044 2-F 8/9/19 28744 2-Sa 8/10/19 13044 3-Su 8/11/19 58143 3-M 8/12/19 29547 3-T 8/13/19 13044 3-W 8/14/19 28844 3-Th 8/15/19 13044 3-F 8/16/19 25644 3-Sa 8/17/19 25744 4-Su 8/18/19 13044 4-M 8/19/19 25344 4-T 8/20/19 13044 4-W 8/21/19 28244 4-Th 8/22/19 29044 4-F 8/23/19 13044 4-Sa 8/24/19 13044 5-Su 8/25/19 28344 5-M 8/26/19 13044 5-T 8/27/19 28644 5-W 8/28/19 29244 5-Th 8/29/19 13044 5-F 8/30/19 28544 5-Sa 8/31/19 28844 724666 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 08/01/2019 - 08/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-Th 8/1/19 29.1 1-F 8/2/19 27.1 1-Sa 8/3/19 28.3 2-Su 8/4/19 29.1 2-M 8/5/19 26.2 2-T 8/6/19 29.3 2-W 8/7/19 27.4 2-Th 8/8/19 28.6 2-F 8/9/19 26.5 2-Sa 8/10/19 28.6 3-Su 8/11/19 28.4 3-M 8/12/19 25.1 3-T 8/13/19 25.7 3-W 8/14/19 26.6 3-Th 8/15/19 29.0 3-F 8/16/19 26.8 3-Sa 8/17/19 28.3 4-Su 8/18/19 28.2 4-M 8/19/19 26.8 4-T 8/20/19 29.0 4-W 8/21/19 26.4 4-Th 8/22/19 28.1 4-F 8/23/19 25.1 4-Sa 8/24/19 29.2 5-Su 8/25/19 28.9 5-M 8/26/19 26.4 5-T 8/27/19 28.5 5-W 8/28/19 26.9 5-Th 8/29/19 28.4 5-F 8/30/19 27.3 5-Sa 8/31/19 28.8 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

ENERGY NORTHWEST INTEROFFICE MEMO GO2-19-149 DIC: 1316.20 DATE: October 10, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station SEPTEMBER 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for September 2019. All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Columbia Generating Station Page 2 of 2 October 10, 2019 Columbia Generating Station SEPTEMBER 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: Conner Holbrook, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 09/01/2019 - 09/30/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

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s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Su 9/1/19 4.8 7.9 8.5 33.6 1-M 9/2/19 2.7 7.8 8.2 0 32.7 <0.1 <0.1 1-T 9/3/19 4.5 8.0 8.2 33.1 0.9* 8.2* <1* 10*

1-W 9/4/19 2.4 8.0 8.3 0 33.4 <0.1 <0.1 1-Th 9/5/19 4.7 7.9 8.2 32.7 1-F 9/6/19 2.3 7.9 8.2 0 33.4 <0.1 <0.1 1-Sa 9/7/19 4.9 8.1 8.4 34.9 2-Su 9/8/19 4.9 7.9 8.3 35.6 2-M 9/9/19 2.7 7.9 8.5 0 34.1 <0.1 <0.1 2-T 9/10/19 4.3 7.8 8.7 33.7 2-W 9/11/19 1.3 7.7 8.2 0 33.1 <0.1 <0.1 2-Th 9/12/19 4.6 7.6 8.1 34.5 2-F 9/13/19 2.5 7.9 8.3 0 34.1 <0.1 <0.1 2-Sa 9/14/19 4.1 8.1 8.3 33.9 3-Su 9/15/19 4.2 8.0 8.3 34.7 3-M 9/16/19 1.9 7.9 8.2 0 33.3 <0.1 <0.1 3-T 9/17/19 4.2 7.8 8.4 33.1 3-W 9/18/19 1.3 8.1 8.4 0 32.6 <0.1 <0.1 3-Th 9/19/19 2.1 8.0 8.3 32.8 3-F 9/20/19 1.1 8.2 8.3 0 32.8 <0.1 <0.1 3-Sa 9/21/19 2.6 8.2 8.3 33.0 4-Su 9/22/19 2.6 8.2 8.3 33.7 4-M 9/23/19 1.5 8.2 8.4 0 33.5 <0.1 <0.1 4-T 9/24/19 3.2 8.3 8.4 33.7 4-W 9/25/19 1.4 8.3 8.4 0 33.4 <0.1 <0.1 4-Th 9/26/19 2.8 8.3 8.4 34.1 4-F 9/27/19 1.3 8.3 8.5 33.7 4-Sa 9/28/19 2.2 8.4 8.5 27.7 5-Su 9/29/19 2.2 8.4 8.5 25.9 5-M 9/30/19 0.6 8.4 8.5 0 25.4 <0.1 <0.1 Instantaneous 7.6 Minimum >= 6.5 (RO) 2.9 <1 10 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.7 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-Su 9/1/19 1-M 9/2/19 1-T 9/3/19 1-W 9/4/19 1-Th 9/5/19 1-F 9/6/19 1-Sa 9/7/19 2-Su 9/8/19 2-M 9/9/19 2-T 9/10/19 2-W 9/11/19 2-Th 9/12/19 2-F 9/13/19 2-Sa 9/14/19 3-Su 9/15/19 3-M 9/16/19 3-T 9/17/19 3-W 9/18/19 3-Th 9/19/19 3-F 9/20/19 3-Sa 9/21/19 4-Su 9/22/19 4-M 9/23/19 4-T 9/24/19 4-W 9/25/19 4-Th 9/26/19 4-F 9/27/19 4-Sa 9/28/19 5-Su 9/29/19 5-M 9/30/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 9/3/2019 0.9 Results reported from a grab sample collected 9/3/2019 Measured NTU CWB Copper 9/3/2019 8.2 Results reported from a 24-hr composite sample collected Total 9/2/2019-9/3/2019 Micrograms/L (ug/L)

CWB Chromium 9/3/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 9/2/2019-9/3/2019 Micrograms/L (ug/L)

CWB Zinc 9/3/2019 10 Results reported from a 24-hr composite sample collected Total 9/2/2019-9/3/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 09/01/2019 - 09/30/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Su 9/1/19 27326 1-M 9/2/19 11726 1-T 9/3/19 27826 1-W 9/4/19 11726 1-Th 9/5/19 11726 1-F 9/6/19 28026 1-Sa 9/7/19 27626 2-Su 9/8/19 27926 2-M 9/9/19 11726 2-T 9/10/19 28226 2-W 9/11/19 27926 2-Th 9/12/19 28026 2-F 9/13/19 27826 2-Sa 9/14/19 28226 3-Su 9/15/19 11726 3-M 9/16/19 11726 3-T 9/17/19 28226 3-W 9/18/19 27726 3-Th 9/19/19 27926 3-F 9/20/19 28226 3-Sa 9/21/19 28026 4-Su 9/22/19 11726 4-M 9/23/19 28326 4-T 9/24/19 11726 4-W 9/25/19 11726 4-Th 9/26/19 28126 4-F 9/27/19 28126 4-Sa 9/28/19 11726 5-Su 9/29/19 27626 5-M 9/30/19 28226 676780 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 09/01/2019 - 09/30/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-Su 9/1/19 28.9 1-M 9/2/19 26.4 1-T 9/3/19 28.4 1-W 9/4/19 26.4 1-Th 9/5/19 28.7 1-F 9/6/19 26.9 1-Sa 9/7/19 28.7 2-Su 9/8/19 28.2 2-M 9/9/19 26.6 2-T 9/10/19 27.0 2-W 9/11/19 24.7 2-Th 9/12/19 28.2 2-F 9/13/19 26.4 2-Sa 9/14/19 27.6 3-Su 9/15/19 27.8 3-M 9/16/19 24.0 3-T 9/17/19 26.6 3-W 9/18/19 23.9 3-Th 9/19/19 24.9 3-F 9/20/19 23.9 3-Sa 9/21/19 23.6 4-Su 9/22/19 25.6 4-M 9/23/19 23.7 4-T 9/24/19 26.0 4-W 9/25/19 24.2 4-Th 9/26/19 26.4 4-F 9/27/19 23.9 4-Sa 9/28/19 23.3 5-Su 9/29/19 22.5 5-M 9/30/19 21.5 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

INTEROFFICE MEMO GO2-19-157 DIC: 1316.20 DATE: November 13, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station OCTOBER 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for October 2019. All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Columbia Generating Station Page 2 of 2 November 13, 2019 Columbia Generating Station OCTOBER 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: Conner Holbrook, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 10/01/2019 - 10/31/2019 Outfall: 001 Version: 1 C,orn,posltc sampl*ili ,[24 li'lour I Composite sampl** ,[24 li'lour l C-omposltc sampl** ,[24 hour I J'Qll~! Rt*sldu:t! Chlorlno p H ex:curs ion To.!al Ccrn bined llif! ion Gall ons/Oa y Tci!al Toi'al To.!al llilillig rams,/L Im g /1..]

S;t !lndat d Unil'.!1, lliit*redl~CC01'<:ie~ 11.t**edlRcc Ol'dt~

s;t andard Unill'!I. To.l al re*!lidlla I llilin uies T\Mbrdll)' (NTU I llilillig rams,/L Im g /1..]

Continuous llilicrngram s fl (ugfl l llilicrogr-amsfl (ugfq llilicrogram i;,fl (ugfq ll'H O.illy Min ll'H O;;lly M;:i.:x Chromium ContinUOLIS CQntinuou51 Corninuol.lS Tompt *~ ur**

[le.asLWed lle.aaLWed Glr~b llleteted/Reo orde,d On oe per defi,ned ev1tnt Du-al Ion llil<Xlihly llilonthly M<mihly llil<mihly On oe per defined' event Crab Row !lletere d/Reo t!ide,d llletered/Reo 0rde,d D,e,grees C NHJ Coppo, ZJnc On oe per defined evtnt Hli'Jo,gem, Oir~b Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-T 10/1/19 2.7 8.4 8.5 24.8 1-W 10/2/19 1.2 8.4 8.5 0 24.9 <0.1 <0.1 1-Th 10/3/19 2.6 8.4 8.5 26.9 1-F 10/4/19 1.2 8.4 8.5 0 26.9 <0.1 <0.1 1-Sa 10/5/19 2.6 8.4 8.5 27.2 2-Su 10/6/19 2.6 8.4 8.5 27.1 2-M 10/7/19 1.3 8.4 8.5 0 29.0 1.0* 12* <1* 15* <0.1 <0.1 2-T 10/8/19 2.9 8.4 8.5 30.5 2-W 10/9/19 1.2 8.3 8.5 0 25.7 <0.1 <0.1 2-Th 10/10/19 3.0 8.2 8.3 23.8 2-F 10/11/19 1.2 8.2 8.3 0 23.5 <0.1 <0.1 2-Sa 10/12/19 2.2 8.3 8.3 24.1 3-Su 10/13/19 2.2 8.3 8.3 25.3 3-M 10/14/19 1.0 8.2 8.3 0 25.7 <0.1 <0.1 3-T 10/15/19 3.2 8.2 8.3 26.1 3-W 10/16/19 0.7 8.2 8.3 0 26.1 <0.1 <0.1 3-Th 10/17/19 2.8 8.2 8.3 28.8 3-F 10/18/19 1.2 8.2 8.3 0 28.4 <0.1 <0.1 3-Sa 10/19/19 2.5 8.2 8.3 27.9 4-Su 10/20/19 2.5 8.2 8.3 26.7 4-M 10/21/19 1.3 8.2 8.3 0 27.7 <0.1 <0.1 4-T 10/22/19 2.6 8.2 8.3 30.8 4-W 10/23/19 0.8 8.2 8.3 0 28.2 <0.1 <0.1 4-Th 10/24/19 3.4 8.2 8.3 25.3 4-F 10/25/19 1.8 8.2 8.3 0 27.7 <0.1 <0.1 4-Sa 10/26/19 2.8 8.2 8.3 26.9 5-Su 10/27/19 2.9 8.1 8.3 24.8 5-M 10/28/19 0.8 8.1 8.3 0 23.2 <0.1 <0.1 5-T 10/29/19 2.6 8.0 8.3 24.3 5-W 10/30/19 1.2 8.0 8.1 0 25.4 <0.1 <0.1 5-Th 10/31/19 2.5 8.0 8.2 26.3 Instantaneous 8.0 Minimum >= 6.5 (RO) 2.1 <1 15 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.5 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5

~*re<11Rcoordtd l)H Volu_me W.eekl y Standard Unit!!.

Million Gall ons.

1/0,a,y Grab Continuous, Monitoring Week Point SSWD SSWD 1-T 10/1/19 1-W 10/2/19 1-Th 10/3/19 1-F 10/4/19 1-Sa 10/5/19 2-Su 10/6/19 2-M 10/7/19 2-T 10/8/19 2-W 10/9/19 2-Th 10/10/19 2-F 10/11/19 2-Sa 10/12/19 3-Su 10/13/19 3-M 10/14/19 3-T 10/15/19 3-W 10/16/19 3-Th 10/17/19 3-F 10/18/19 3-Sa 10/19/19 4-Su 10/20/19 4-M 10/21/19 4-T 10/22/19 4-W 10/23/19 4-Th 10/24/19 4-F 10/25/19 4-Sa 10/26/19 5-Su 10/27/19 5-M 10/28/19 5-T 10/29/19 5-W 10/30/19 5-Th 10/31/19 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 10/7/2019 1.0 Results reported from a grab sample collected 10/7/2019 Measured NTU CWB Copper 10/7/2019 12 Results reported from a 24-hr composite sample collected Total 10/6/2019-10/7/2019 Micrograms/L (ug/L)

CWB Chromium 10/7/2019 Bl<1 Results reported from a 24-hr composite sample collected Total 10/6/2019-10/7/2019 Micrograms/L (ug/L)

CWB Zinc 10/7/2019 15 Results reported from a 24-hr composite sample collected Total 10/6/2019-10/7/2019 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 10/01/2019 - 10/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-T 10/1/19 33599 1-W 10/2/19 33199 1-Th 10/3/19 17099 1-F 10/4/19 33699 1-Sa 10/5/19 17099 2-Su 10/6/19 17099 2-M 10/7/19 17099 2-T 10/8/19 17099 2-W 10/9/19 49499 2-Th 10/10/19 17099 2-F 10/11/19 32299 2-Sa 10/12/19 17099 3-Su 10/13/19 17099 3-M 10/14/19 17099 3-T 10/15/19 33199 3-W 10/16/19 17099 3-Th 10/17/19 33299 3-F 10/18/19 17099 3-Sa 10/19/19 17099 4-Su 10/20/19 17099 4-M 10/21/19 33299 4-T 10/22/19 32099 4-W 10/23/19 33199 4-Th 10/24/19 17099 4-F 10/25/19 32799 4-Sa 10/26/19 17099 5-Su 10/27/19 33099 5-M 10/28/19 17099 5-T 10/29/19 33399 5-W 10/30/19 17099 5-Th 10/31/19 32899 770269 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 10/01/2019 - 10/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-T 10/1/19 23.9 1-W 10/2/19 22.3 1-Th 10/3/19 24.5 1-F 10/4/19 22.9 1-Sa 10/5/19 24.5 2-Su 10/6/19 24.3 2-M 10/7/19 23.5 2-T 10/8/19 24.9 2-W 10/9/19 22.5 2-Th 10/10/19 23.1 2-F 10/11/19 21.5 2-Sa 10/12/19 22.6 3-Su 10/13/19 23.3 3-M 10/14/19 22.5 3-T 10/15/19 24.0 3-W 10/16/19 22.2 3-Th 10/17/19 24.7 3-F 10/18/19 22.7 3-Sa 10/19/19 23.0 4-Su 10/20/19 22.8 4-M 10/21/19 22.1 4-T 10/22/19 24.6 4-W 10/23/19 21.7 4-Th 10/24/19 24.3 4-F 10/25/19 22.9 4-Sa 10/26/19 23.5 5-Su 10/27/19 22.8 5-M 10/28/19 20.9 5-T 10/29/19 21.4 5-W 10/30/19 19.6 5-Th 10/31/19 21.6 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

INTEROFFICE MEMO GO2-19-169 DIC: 1316.20 DATE: December 11, 2019 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NOVEMBER 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for November 2019. All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

It should be noted that the start-up of the new continuous halogenation and dehalogenation system occurred on November 6, 2019.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Columbia Generating Station Page 2 of 2 December 11, 2019 Columbia Generating Station NOVEMBER 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: Conner Holbrook, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 11/01/2019 - 11/30/2019 Outfall: 001 Version: 1 TOllell Chromium line T011 al TOllall roc~I Rttsl d~'I C~IOt'lno lilinutes tb!*~ N lili erogr arns/ L (ug/L )

!IIJilli o n Oall on!l!Oay

!IWtcred./Ri:~ ordtd Corni nLIOL.15 p H Dal l y "1a:,,: lili er ogr ameil l (ug/L) Trn*al C-0rn'bined M*:tcu,dJRH t.ll'd~d lili crogr arnsl l (ug/L ) Trn*al' residual Turbldily [Nf:Uj lillonfhly St andilrd Uniil'!I St andard Un,il'!I C,orni nui:n.1s

>Ii ex-curs

i on Mcmihly Monfhly lililli g ram s/,L (im g /L] lililli g ralills/,L (lill g /L) 111 1n Onoe per d9fi n ed ev11cn1' h ml}tr.rturo CQntinuou11, C,ornposltc sam p l e (24 ~our I lilea.!lure(I Met0red/Rec orded 1 1 Composite sam p l o (24 ~our I C,omposltc $.tm p l o (24 ~our I Corni nuo1.1s lilet0red/Rec orded p H Dal l) Our~lion !IIJea,gured Monfhly Copper Onoe per d9fi ned ev11cnt Onoe per d 9fi ned ev11cnt D-e.grees. C 1

Fiow Mehm1dll\:ec ord11d NT U 0.r;_;b Gr;,b Gr:.lb Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-F 11/1/19 0.7 8.2 8.2 0 22.5 <0.1* <0.1 1-Sa 11/2/19 2.4 8.0 8.3 22.8 2-Su 11/3/19 1.5 8.1 8.3 22.8 2-M 11/4/19 1.3 8.2 8.4 0 22.8 1.5* 9.9* 1.1* 13* <0.1* <0.1 2-T 11/5/19 2.8 8.1 8.5 24.1 2-W 11/6/19 2.5 8.2 8.6 25.1 <0.1 <0.1 2-Th 11/7/19 2.8 7.9 8.3 24.2 2-F 11/8/19 2.0 7.9 8.4 23.8 <0.1 <0.1 2-Sa 11/9/19 2.8 7.9 8.3 24.0 3-Su 11/10/19 2.8 8.1 8.3 24.7 3-M 11/11/19 2.8 8.1 8.3 24.1 3-T 11/12/19 2.8 8.1 8.4 23.9 3-W 11/13/19 2.8 8.1 8.3 24.4 3-Th 11/14/19 2.7 8.1 8.3 24.5 3-F 11/15/19 2.2 8.1 8.3 25.4 3-Sa 11/16/19 2.2 8.0 8.3 25.1 4-Su 11/17/19 2.2 8.2 8.3 26.6 4-M 11/18/19 2.2 8.1 8.3 26.2 4-T 11/19/19 2.2 8.2 8.3 25.9 4-W 11/20/19 2.2 8.2 8.3 25.4 4-Th 11/21/19 2.2 7.8 8.2 25.2 4-F 11/22/19 1.2 7.7 8.1 24.4 <0.1 <0.1 4-Sa 11/23/19 2.2 8.0 8.1 24.5 5-Su 11/24/19 2.2 8.0 8.4 25.3 5-M 11/25/19 1.3 7.8 8.4 25.1 5-T 11/26/19 2.2 7.6 8.0 24.5 5-W 11/27/19 2.3 7.6 7.9 24.3 5-Th 11/28/19 2.3 7.5 7.6 23.9 5-F 11/29/19 2.3 7.5 7.6 26.1 5-Sa 11/30/19 2.2 7.5 7.6 24.2 Instantaneous 7.5 Minimum >= 6.5 (RO) 2.2 1.1 13 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.6 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge, M - Monitoring Is Conditional/Not Req This MP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 H:rl09Cn;., Tot;:i;I Combt nt d, 'i'<:1UI Ru ldlnl To!*al Re,si dL.1al lillil ligra1111.s/,L (1111 gll]

St and;lrd U111it11 Ml*:torvdJ~*e <<d~d lillil lion -GaUons 1IO.I)' 11Day Vol l.ime CQnti nuous.

~'fe,ekly O;r:,b pH Grab Monitoring Week Point CWB2 SSWD SSWD 1-F 11/1/19 M 1-Sa 11/2/19 M 2-Su 11/3/19 M 2-M 11/4/19 M 2-T 11/5/19 M 2-W 11/6/19 0.05 2-Th 11/7/19 0.09 2-F 11/8/19 0.09 2-Sa 11/9/19 0.03 3-Su 11/10/19 0.01 3-M 11/11/19 0.02 3-T 11/12/19 0.05 3-W 11/13/19 0.01 3-Th 11/14/19 0.02 3-F 11/15/19 0.02 3-Sa 11/16/19 0.01 4-Su 11/17/19 0.01 4-M 11/18/19 0.01 4-T 11/19/19 0.01 4-W 11/20/19 0.00 4-Th 11/21/19 0.00 4-F 11/22/19 0.04 4-Sa 11/23/19 0.01 5-Su 11/24/19 0.06 5-M 11/25/19 0.02 5-T 11/26/19 0.01 5-W 11/27/19 0.06 5-Th 11/28/19 0.03 5-F 11/29/19 0.06 5-Sa 11/30/19 0.03 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB Turbidity (Nephelometric) 11/4/2019 1.5 Results from a grab sample collected 11/4/2019 Measured NTU CWB Copper 11/4/2019 9.9 Results reported from a 24-hr composite sample collected Total 11/3/2019-11/4/2019 Micrograms/L (ug/L)

CWB Chromium 11/4/2019 1.1 Results reported from a 24-hr composite sample collected Total 11/3/2019-11/4/2019 Micrograms/L (ug/L)

CWB Zinc 11/4/2019 13 Results reported from a 24-hr composite sample collected Total 11/3/2019-11/4/2019 Micrograms/L (ug/L)

CWB Chlorine 11/1/2019 Bl<0.1 Batch halogenation, total residual halogen reported Total residual Milligrams/L (mg/L)

CWB Chlorine 11/4/2019 Bl<0.1 Batch halogenation, total residual halogen reported Total residual Milligrams/L (mg/L)

CWB2 All Parameters Continuous halogenation with dehalogenation begun on 11/6/19. Maximum daily total residual halogen reported.

SSWD All Parameters C No discharge from the standby service water ponds.

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 11/01/2019 - 11/30/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-F 11/1/19 15479 1-Sa 11/2/19 31579 2-Su 11/3/19 15479 2-M 11/4/19 31279 2-T 11/5/19 15479 2-W 11/6/19 15479 2-Th 11/7/19 31479 2-F 11/8/19 31779 2-Sa 11/9/19 31479 3-Su 11/10/19 15479 3-M 11/11/19 31179 3-T 11/12/19 15479 3-W 11/13/19 31179 3-Th 11/14/19 15479 3-F 11/15/19 31879 3-Sa 11/16/19 15479 4-Su 11/17/19 15479 4-M 11/18/19 15479 4-T 11/19/19 29979 4-W 11/20/19 31193 4-Th 11/21/19 15479 4-F 11/22/19 31279 4-Sa 11/23/19 30641 5-Su 11/24/19 15479 5-M 11/25/19 31417 5-T 11/26/19 31479 5-W 11/27/19 15479 5-Th 11/28/19 31279 5-F 11/29/19 15479 5-Sa 11/30/19 30979 716784 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge, M - Monitoring Is Conditional/Not Req This MP

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 11/01/2019 - 11/30/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-F 11/1/19 19.0 1-Sa 11/2/19 21.5 2-Su 11/3/19 20.3 2-M 11/4/19 20.5 2-T 11/5/19 21.9 2-W 11/6/19 21.8 2-Th 11/7/19 21.9 2-F 11/8/19 20.6 2-Sa 11/9/19 21.5 3-Su 11/10/19 21.8 3-M 11/11/19 21.8 3-T 11/12/19 21.2 3-W 11/13/19 22.0 3-Th 11/14/19 21.9 3-F 11/15/19 21.7 3-Sa 11/16/19 20.8 4-Su 11/17/19 21.8 4-M 11/18/19 21.6 4-T 11/19/19 22.0 4-W 11/20/19 22.3 4-Th 11/21/19 20.6 4-F 11/22/19 18.3 4-Sa 11/23/19 19.6 5-Su 11/24/19 21.2 5-M 11/25/19 20.1 5-T 11/26/19 20.1 5-W 11/27/19 21.2 5-Th 11/28/19 20.6 5-F 11/29/19 20.0 5-Sa 11/30/19 19.8 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge, M - Monitoring Is Conditional/Not Req This MP 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

INTEROFFICE MEMO GO2-20-011 DIC: 1316.20 DATE: January 13, 2020 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station DECEMBER 2019 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for December 2019. All monitoring parameters were within permit specifications for the month with no issues of concern. The report will be submitted electronically to the State of Washington Department of Ecology (Ecology) via Ecologys online reporting system.

If you have any questions concerning this information, please contact WK Whitehead at (509) 377-8794.

JTL INTERNAL DISTRIBUTION: FILE COPY SEK LB Docket File PE20 WK Whitehead PE03 Columbia Files 964Y JT LePage 1025 P.O. Box 968 / Richland, WA 99352-0968 / (509) 372-5000 / www.energy-northwest.com Columbia Generating Station Page 2 of 2 January 13, 2020 Columbia Generating Station DECEMBER 2019 NPDES DISCHARGE MONITORING REPORT 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Prepared by: Jane T. LePage, Environmental Scientist, Environmental Services Reviewed by: Conner Holbrook, Environmental Scientist, Environmental Services Reviewed by: W. Kip Whitehead, Environmental Scientist Principal, E&RP Approved by: Brad Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 1 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 12/01/2019 - 12/31/2019 Outfall: 001 Version: 1 TOllell Chromium line T011 al TOllall roc~I Rttsl d~'I C~IOt'lno lilinutes tb!*~ N lili erogr arns/ L (ug/L )

!IIJilli o n Oall on!l!Oay

!IWtcred./Ri:~ ordtd Corni nLIOL.15 p H Dal l y "1a:,,: lili er ogr ameil l (ug/L) Trn*al C-0rn'bined M*:tcu,dJRH t.ll'd~d lili crogr arnsl l (ug/L ) Trn*al' residual Turbldily [Nf:Uj lillonfhly St andilrd Uniil'!I St andard Un,il'!I C,orni nui:n.1s

>Ii ex-curs

i on Mcmihly Monfhly lililli g ram s/,L (im g /L] lililli g ralills/,L (lill g /L) 111 1n Onoe per d9fi n ed ev11cn1' h ml}tr.rturo CQntinuou11, C,ornposltc sam p l e (24 ~our I lilea.!lure(I Met0red/Rec orded 1 1 Composite sam p l o (24 ~our I C,omposltc $.tm p l o (24 ~our I Corni nuo1.1s lilet0red/Rec orded p H Dal l) Our~lion !IIJea,gured Monfhly Copper Onoe per d9fi ned ev11cnt Onoe per d 9fi ned ev11cnt D-e.grees. C 1

Fiow Mehm1dll\:ec ord11d NT U 0.r;_;b Gr;,b Gr:.lb Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Su 12/1/19 2.2 7.6 7.7 26.6 1-M 12/2/19 2.2 7.6 7.7 24.9 1-T 12/3/19 1.6 7.5 7.9 24.5 28* 19* 2.0* 42* <0.1 <0.1 1-W 12/4/19 2.4 7.9 8.0 22.4 1-Th 12/5/19 0.8 7.8 8.0 0 22.4 <0.1 <0.1 1-F 12/6/19 2.7 7.9 8.0 22.8 1-Sa 12/7/19 2.7 7.9 8.0 23.5 2-Su 12/8/19 2.7 7.9 8.0 24.2 2-M 12/9/19 1.4 7.6 7.9 24.0 <0.1 <0.1 2-T 12/10/19 2.6 7.5 8.0 23.2 2-W 12/11/19 1.7 7.5 7.6 22.6 <0.1 <0.1 2-Th 12/12/19 1.1 7.7 8.0 24.5 2-F 12/13/19 2.5 7.6 8.0 24.8 2-Sa 12/14/19 2.0 7.6 7.8 23.7 3-Su 12/15/19 2.0 7.7 8.0 22.1 <0.1 <0.1 3-M 12/16/19 2.5 7.7 7.9 22.3 3-T 12/17/19 1.8 7.2 8.1 22.3 <0.1 <0.1 3-W 12/18/19 2.5 8.0 8.2 23.7 3-Th 12/19/19 2.5 7.4 8.1 24.2 3-F 12/20/19 2.5 7.6 8.1 28.1 3-Sa 12/21/19 2.5 7.6 8.1 27.5 4-Su 12/22/19 2.5 7.7 8.2 26.6 4-M 12/23/19 1.7 7.7 8.2 25.7 <0.1 <0.1 4-T 12/24/19 2.5 8.1 8.2 24.3 4-W 12/25/19 2.6 8.1 8.2 22.7 4-Th 12/26/19 2.6 7.5 8.1 22.8 4-F 12/27/19 2.6 7.6 8.2 22.6 4-Sa 12/28/19 2.6 7.5 8.0 24.3 5-Su 12/29/19 2.6 7.4 8.0 23.5 5-M 12/30/19 0.8 7.5 8.1 22.9 <0.1 <0.1 5-T 12/31/19 2.5 7.6 8.2 26.9 Instantaneous 7.2 Minimum >= 6.5 (RO) 2.2 2 42 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.2 Maximum <= 9.0 (RO) 0 Monthly Total

<= 446 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 H:rl09Cn;., Tot;:i;I Combt nt d, 'i'<:1UI Ru ldlnl To!*al Re,si dL.1al lillil ligra1111.s/,L (1111 gll]

St and;lrd U111it11 Ml*:torvdJ~*e <<d~d lillil lion -GaUons 1IO.I)' 11Day Vol l.ime CQnti nuous.

~'fe,ekly O;r:,b pH Grab Monitoring Week Point CWB2 SSWD SSWD 1-Su 12/1/19 0.05 1-M 12/2/19 0.03 1-T 12/3/19 0.02 1-W 12/4/19 0.03 1-Th 12/5/19 0.09 1-F 12/6/19 0.04 1-Sa 12/7/19 0.03 2-Su 12/8/19 0.01 2-M 12/9/19 0.00 2-T 12/10/19 0.00 2-W 12/11/19 0.05 2-Th 12/12/19 0.00 2-F 12/13/19 0.01 2-Sa 12/14/19 0.01 3-Su 12/15/19 0.01 3-M 12/16/19 0.01 3-T 12/17/19 0.07 3-W 12/18/19 0.01 3-Th 12/19/19 0.00 3-F 12/20/19 0.00 3-Sa 12/21/19 0.03 4-Su 12/22/19 0.00 4-M 12/23/19 0.06 4-T 12/24/19 0.03 4-W 12/25/19 0.03 4-Th 12/26/19 0.03 4-F 12/27/19 0.03 4-Sa 12/28/19 0.01 5-Su 12/29/19 0.00 5-M 12/30/19 0.01 5-T 12/31/19 0.01 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

ta Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 Outfall: 001 -

Monitoring Parameter Sample Date/ Value Notes/Comment Point Statistical Base CWB All Parameters Total residual halogenation reported.

CWB Turbidity (Nephelometric) 12/3/2019 28 Results from a grab sample collected 12/3/2019 Measured NTU CWB Copper 12/3/2019 19 Results reported from a 24-hr composite sample collected Total 12/2/2019-12/3/2019 Micrograms/L (ug/L)

CWB Chromium 12/3/2019 2.0 Results reported from a 24-hr composite sample collected Total 12/2/2019-12/3/2019 Micrograms/L (ug/L)

CWB Zinc 12/3/2019 42 Results reported from a 24-hr composite sample collected Total 12/2/2019-12/3/2019 Micrograms/L (ug/L)

CWB2 All Parameters Maximum daily total residual halogenation from continuous TRH analyzer reported.

SSWD All Parameters C No discharge from the standby service water ponds

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 4 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 12/01/2019 - 12/31/2019 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Su 12/1/19 16073 1-M 12/2/19 32073 1-T 12/3/19 16073 1-W 12/4/19 31673 1-Th 12/5/19 16073 1-F 12/6/19 16073 1-Sa 12/7/19 32273 2-Su 12/8/19 16073 2-M 12/9/19 16073 2-T 12/10/19 16073 2-W 12/11/19 31673 2-Th 12/12/19 29273 2-F 12/13/19 28873 2-Sa 12/14/19 28973 3-Su 12/15/19 16073 3-M 12/16/19 29173 3-T 12/17/19 16073 3-W 12/18/19 16073 3-Th 12/19/19 41473 3-F 12/20/19 28873 3-Sa 12/21/19 16073 4-Su 12/22/19 16073 4-M 12/23/19 32173 4-T 12/24/19 16073 4-W 12/25/19 16073 4-Th 12/26/19 32573 4-F 12/27/19 32373 4-Sa 12/28/19 32473 5-Su 12/29/19 16073 5-M 12/30/19 16073 5-T 12/31/19 32373 733463 Monthly Total Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 5 of 5 Permit Number: WA0025151 Permittee: Energy Northwest Columbia Generating Station Facility County: Benton Receiving Waterbody:

Monitoring Period: 12/01/2019 - 12/31/2019 Outfall: Intk - Cooling water intake structure Version: 1

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Week Point Intk 1-Su 12/1/19 20.1 1-M 12/2/19 18.4 1-T 12/3/19 19.2 1-W 12/4/19 18.8 1-Th 12/5/19 19.1 1-F 12/6/19 19.8 1-Sa 12/7/19 20.3 2-Su 12/8/19 20.7 2-M 12/9/19 18.7 2-T 12/10/19 19.7 2-W 12/11/19 19.2 2-Th 12/12/19 19.4 2-F 12/13/19 21.2 2-Sa 12/14/19 15.7 3-Su 12/15/19 17.8 3-M 12/16/19 19.5 3-T 12/17/19 19.0 3-W 12/18/19 20.1 3-Th 12/19/19 19.9 3-F 12/20/19 23.0 3-Sa 12/21/19 23.0 4-Su 12/22/19 22.1 4-M 12/23/19 18.0 4-T 12/24/19 19.8 4-W 12/25/19 20.6 4-Th 12/26/19 20.3 4-F 12/27/19 19.8 4-Sa 12/28/19 20.4 5-Su 12/29/19 20.2 5-M 12/30/19 19.1 5-T 12/31/19 22.1 Reporting Codes Used: B - Below Detection Limit/No Detection, C - No Discharge 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 information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Signature Date

GO2-20-027, Energy Northwest to NMFS, Columbia Generating Station 2019 Biological Monitoring Report

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GO2-20-027, Energy Northwest to NMFS, Columbia Generating Station 2019 Biological Monitoring Report

Text

Dear Mr. Graves:

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