GO2-19-026, Energy Northwest, 2018 Biological Monitoring Report

Energy Northwest, 2018 Biological Monitoring Report

ML19030A204
Person / Time
Site:	Columbia
Issue date:	01/28/2019
From:	Khounnala S Energy Northwest
To:	Graves R US Dept of Commerce, National Marine Fisheries Service
Briana Grange 301-415-1042
References
DIC 404.1, GO2-19-026
Download: ML19030A204 (88)

Text

Shannon E. Khounnala Columbia Generating Station P.O. Box 968, MD PE03 Richland, WA 99352-0968 Ph. 509-377-8639 sekhounnala@energy-northwest.com January 28, 2019 GO2-19-026 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

Subject:

2018 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 2018 Biological Monitoring Report.

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

Sincerely, 28/01/19 15:56:52 -08:00 X

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

Attachments: 1. GO2-19-026 - 2018 Post Season Fish Collection Report - Attachment 1

2. GO2-19-026 - 2018 NPDES Permit DMRs - Attachment 2 cc: Briana Grange, NRC, Briana.Grange@NRC.gov NRC Document Control Desk EndangeredSpecies.Resource@NRC.gov INTERNAL DISTRIBUTION: FILE COPY SEK/lb Columbia Files 964Y Docket File PE20

Prepared by Energy Northwest Environmental Services, January 2019 Energy Northwest Columbia Generating Station 2018 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 2018 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 2018 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 2 resident and 1 anadromous 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 2018 were walleye and small mouth bass. Two walleye were obtained as a fisherman donation in May. Information provided by the fishermen indicated the fish were caught on 5/1/18 within vicinity of the green buoy marking the Columbia Generating Station (CGS) discharge location.

Energy Northwest (ENW) personnel collected five small mouth bass on 8/17/18 from a shore location downstream of the CGS pump house. GPS coordinates were recorded as 46.473056, -119.265344, water temperature as 20.6 degrees Celsius. The fish was caught using hook and line techniques that targeted bass. No other fish were caught or hooked and no impact to an endangered or threatened species was observed. 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.

The two walleye obtained as a fisherman donation in October. Information provided by the fishermen indicated the fish were caught on 10/26/18 near the Lyons Ferry Marina. ENW personnel collected three small mouth bass on 9/8/18 from a location between the Hood Park and Ice Harbor Dam, GPS coordinates were recorded as 46.240926, -118.954463.

Prepared by Energy Northwest Environmental Services, January 2019 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 9/12/18.

The fish carcasses were obtained from both the Ringold and Lyons Ferry fish hatcheries on 11/6/18.

Fish Collection Summary Reasonable and prudent measures were utilized to minimize the impact of biological monitoring activities during 2018.

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 2018 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). Based on the results of these quarterly acute toxicity tests and the monthly monitoring, there have been no changes in CGS operations that affected the effluent discharge during 2018.

INTEROFFICE MEMO GO2-18-034 DIC: 1316.20 DATE: February 12, 2018 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA-002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for January 2018.

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 DISTRIBUTION LIST:

Jane LePage (1025)

W. Kip Whitehead (PE03)

Docket File (PE20)

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, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Jason Brown, Supervisor, Chemistry Operations Approved by: Shannon Khounnala, Manager, E&RP

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: 01/01/2018 - 01/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-M 1/1/18 0.7 8.3 8.3 0 24.6 <0.1 <0.1 1-T 1/2/18 2.5 8.3 8.3 26.5 7.2* 17* 2.2* 28*

1-W 1/3/18 0.8 8.3 8.3 0 26.0 <0.1 <0.1 1-Th 1/4/18 2.2 8.3 8.3 25.6 1-F 1/5/18 0.8 8.3 8.3 0 25.4 <0.1 <0.1 1-Sa 1/6/18 2.4 8.3 8.3 24.5 2-Su 1/7/18 2.4 8.3 8.3 24.3 2-M 1/8/18 0.5 8.3 8.3 0 24.5 <0.1 <0.1 2-T 1/9/18 2.7 8.3 8.3 26.0 2-W 1/10/18 0.7 8.3 8.3 0 25.4 <0.1 <0.1 2-Th 1/11/18 2.5 8.3 8.3 25.6 2-F 1/12/18 2.5 8.3 8.3 25.6 2-Sa 1/13/18 2.5 8.3 8.3 26.3 3-Su 1/14/18 2.5 8.3 8.3 26.1 3-M 1/15/18 0.8 8.3 8.3 0 25.8 <0.1 <0.1 3-T 1/16/18 2.2 8.3 8.3 26.3 3-W 1/17/18 0.7 8.3 8.3 0 26.0 <0.1 <0.1 3-Th 1/18/18 2.9 8.3 8.3 26.9 3-F 1/19/18 0.7 8.3 8.3 0 25.5 <0.1 <0.1 3-Sa 1/20/18 2.3 8.3 8.3 23.5 4-Su 1/21/18 2.3 8.3 8.3 23.6 4-M 1/22/18 0.5 8.3 8.3 0 23.2 <0.1 <0.1 4-T 1/23/18 2.5 8.3 8.3 21.3 4-W 1/24/18 0.6 8.3 8.3 0 21.1 <0.1 <0.1 4-Th 1/25/18 2.4 8.3 8.3 22.6 4-F 1/26/18 0.7 8.3 8.3 0 22.4 <0.1 <0.1 4-Sa 1/27/18 2.4 8.3 8.3 24.7 5-Su 1/28/18 2.4 8.3 8.3 24.0 5-M 1/29/18 0.8 8.3 8.3 0 22.9 <0.1 <0.1 5-T 1/30/18 2.6 8.3 8.3 23.5 5-W 1/31/18 0.7 8.3 8.3 0 23.1 <0.1 <0.1 Instantaneous 8.3 Minimum >= 6.5 (RO) 1.7 2.2 28 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.3 Maximum <= 9.0 (RO) 0 Monthly Total

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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-M 1/1/18 1-T 1/2/18 1-W 1/3/18 1-Th 1/4/18 1-F 1/5/18 1-Sa 1/6/18 2-Su 1/7/18 2-M 1/8/18 2-T 1/9/18 2-W 1/10/18 2-Th 1/11/18 2-F 1/12/18 2-Sa 1/13/18 3-Su 1/14/18 3-M 1/15/18 3-T 1/16/18 3-W 1/17/18 3-Th 1/18/18 3-F 1/19/18 3-Sa 1/20/18 4-Su 1/21/18 4-M 1/22/18 4-T 1/23/18 4-W 1/24/18 4-Th 1/25/18 4-F 1/26/18 4-Sa 1/27/18 5-Su 1/28/18 5-M 1/29/18 5-T 1/30/18 5-W 1/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 1/2/2018 7.2 Results reported from a grab sample collected 1/2/2018 Measured NTU CWB Copper 1/2/2018 17 Results reported from a 24-hr composite sample collected Total 1/1/2018-1/2/2018 Micrograms/L (ug/L)

CWB Chromium 1/2/2018 2.2 Results reported from a 24-hr composite sample collected Total 1/1/2018-1/2/2018 Micrograms/L (ug/L)

CWB Zinc 1/2/2018 28 Results reported from a 24-hr composite sample collected Total 1/1/2018-1/2/2018 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: 01/01/2018 - 01/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-M 1/1/18 15522 1-T 1/2/18 30838 1-W 1/3/18 30165 1-Th 1/4/18 29275 1-F 1/5/18 28756 1-Sa 1/6/18 28995 2-Su 1/7/18 15522 2-M 1/8/18 28549 2-T 1/9/18 15522 2-W 1/10/18 28990 2-Th 1/11/18 29152 2-F 1/12/18 15522 2-Sa 1/13/18 28595 3-Su 1/14/18 28859 3-M 1/15/18 15522 3-T 1/16/18 15522 3-W 1/17/18 28522 3-Th 1/18/18 28822 3-F 1/19/18 15522 3-Sa 1/20/18 29011 4-Su 1/21/18 28813 4-M 1/22/18 15522 4-T 1/23/18 15522 4-W 1/24/18 29042 4-Th 1/25/18 15522 4-F 1/26/18 28622 4-Sa 1/27/18 15522 5-Su 1/28/18 15522 5-M 1/29/18 29278 5-T 1/30/18 15522 5-W 1/31/18 22722 718792 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: 01/01/2018 - 01/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-M 1/1/18 18.7 1-T 1/2/18 20.8 1-W 1/3/18 18.9 1-Th 1/4/18 20.1 1-F 1/5/18 19.0 1-Sa 1/6/18 18.0 2-Su 1/7/18 20.1 2-M 1/8/18 18.9 2-T 1/9/18 21.7 2-W 1/10/18 20.5 2-Th 1/11/18 21.3 2-F 1/12/18 21.3 2-Sa 1/13/18 21.6 3-Su 1/14/18 21.6 3-M 1/15/18 19.4 3-T 1/16/18 21.3 3-W 1/17/18 19.7 3-Th 1/18/18 22.9 3-F 1/19/18 20.2 3-Sa 1/20/18 21.7 4-Su 1/21/18 21.9 4-M 1/22/18 19.8 4-T 1/23/18 20.7 4-W 1/24/18 19.9 4-Th 1/25/18 22.2 4-F 1/26/18 20.4 4-Sa 1/27/18 22.7 5-Su 1/28/18 21.6 5-M 1/29/18 19.8 5-T 1/30/18 22.4 5-W 1/31/18 19.1 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

INTEROFFICE MEMO GO2-18-044 DIC: 1316.20 DATE: March 14, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA-002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for February 2018.

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 DISTRIBUTION LIST:

Jane LePage (1025)

W. Kip Whitehead (PE03)

Docket File (PE20)

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, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Jason Brown, Supervisor, Chemistry Operations Approved by: Shannon Khounnala, Manager, E&RP

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: 02/01/2018 - 02/28/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Th 2/1/18 2.5 8.3 8.3 22.9 1-F 2/2/18 1.2 8.3 8.3 0 23.5 <0.1 <0.1 1-Sa 2/3/18 2.3 8.3 8.3 24.6 2-Su 2/4/18 2.3 8.3 8.3 26.3 2-M 2/5/18 0.8 8.3 8.3 0 26.1 <0.1 <0.1 2-T 2/6/18 2.8 8.3 8.3 23.5 4.3* 14* <1* 19*

2-W 2/7/18 1.2 8.3 8.3 0 23.4 <0.1 <0.1 2-Th 2/8/18 2.3 8.3 8.3 24.5 2-F 2/9/18 1.2 8.3 8.3 0 24.8 <0.1 <0.1 2-Sa 2/10/18 2.3 8.2 8.3 22.9 3-Su 2/11/18 2.3 8.3 8.3 22.0 3-M 2/12/18 0.6 8.3 8.3 0 22.8 <0.1 <0.1 3-T 2/13/18 2.8 8.3 8.3 25.4 3-W 2/14/18 0.9 8.3 8.3 0 24.1 <0.1 <0.1 3-Th 2/15/18 2.3 8.3 8.3 24.8 3-F 2/16/18 1.1 8.3 8.3 0 25.8 <0.1 <0.1 3-Sa 2/17/18 2.1 8.3 8.3 28.7 4-Su 2/18/18 2.1 8.3 8.3 28.5 4-M 2/19/18 1.1 8.3 8.3 0 24.7 <0.1 <0.1 4-T 2/20/18 2.2 8.3 8.3 24.1 4-W 2/21/18 1.2 8.3 8.3 0 24.5 <0.1 <0.1 4-Th 2/22/18 2.2 8.3 8.3 23.0 4-F 2/23/18 0.8 8.3 8.3 0 23.9 <0.1 <0.1 4-Sa 2/24/18 2.1 8.3 8.3 27.4 5-Su 2/25/18 2.1 8.3 8.3 25.1 5-M 2/26/18 1.1 8.3 8.3 0 23.7 <0.1 <0.1 5-T 2/27/18 2.2 8.3 8.3 23.5 5-W 2/28/18 0.6 8.3 8.3 0 23.6 <0.1 <0.1 Instantaneous 8.2 Minimum >= 6.5 (RO) 1.7 <1 19 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.3 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) 2/6/2018 4.3 Results reported from a grab sample collected 2/6/2018 Measured NTU

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Th 2/1/18 1-F 2/2/18 1-Sa 2/3/18 2-Su 2/4/18 2-M 2/5/18 2-T 2/6/18 2-W 2/7/18 2-Th 2/8/18 2-F 2/9/18 2-Sa 2/10/18 3-Su 2/11/18 3-M 2/12/18 3-T 2/13/18 3-W 2/14/18 3-Th 2/15/18 3-F 2/16/18 3-Sa 2/17/18 4-Su 2/18/18 4-M 2/19/18 4-T 2/20/18 4-W 2/21/18 4-Th 2/22/18 4-F 2/23/18 4-Sa 2/24/18 5-Su 2/25/18 5-M 2/26/18 5-T 2/27/18 5-W 2/28/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 3 of 5 CWB Copper 2/6/2018 14 Results reported from a 24-hr composite sample collected Total 2/5/2018-2/6/2018 Micrograms/L (ug/L)

CWB Chromium 2/6/2018 Bl<1 Results reported from a 24-hr composite sample collected Total 2/5/2018-2/6/2018 Micrograms/L (ug/L)

CWB Zinc 2/6/2018 19 Results reported from a 24-hr composite sample collected Total 2/5/2018-2/6/2018 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: 02/01/2018 - 02/28/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Th 2/1/18 14456 1-F 2/2/18 27625 1-Sa 2/3/18 27815 2-Su 2/4/18 27922 2-M 2/5/18 14456 2-T 2/6/18 27531 2-W 2/7/18 27856 2-Th 2/8/18 27756 2-F 2/9/18 14456 2-Sa 2/10/18 27982 3-Su 2/11/18 14456 3-M 2/12/18 27830 3-T 2/13/18 14456 3-W 2/14/18 27610 3-Th 2/15/18 14456 3-F 2/16/18 27930 3-Sa 2/17/18 14456 4-Su 2/18/18 14456 4-M 2/19/18 28002 4-T 2/20/18 27956 4-W 2/21/18 27956 4-Th 2/22/18 27656 4-F 2/23/18 27956 4-Sa 2/24/18 27956 5-Su 2/25/18 14456 5-M 2/26/18 14456 5-T 2/27/18 14456 5-W 2/28/18 28756 633111 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: 02/01/2018 - 02/28/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Th 2/1/18 21.1 1-F 2/2/18 20.5 1-Sa 2/3/18 23.1 2-Su 2/4/18 23.6 2-M 2/5/18 21.5 2-T 2/6/18 22.8 2-W 2/7/18 21.0 2-Th 2/8/18 23.7 2-F 2/9/18 20.7 2-Sa 2/10/18 21.1 3-Su 2/11/18 20.8 3-M 2/12/18 18.9 3-T 2/13/18 21.3 3-W 2/14/18 19.4 3-Th 2/15/18 21.5 3-F 2/16/18 20.6 3-Sa 2/17/18 22.5 4-Su 2/18/18 20.9 4-M 2/19/18 19.2 4-T 2/20/18 20.3 4-W 2/21/18 18.7 4-Th 2/22/18 19.6 4-F 2/23/18 18.4 4-Sa 2/24/18 20.7 5-Su 2/25/18 21.9 5-M 2/26/18 19.9 5-T 2/27/18 21.3 5-W 2/28/18 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.

Shannon Khounnala 3/14/2018 9:37:57 AM Signature Date

INTEROFFICE MEMO GO2-18-060 DIC: 1316.20 DATE: April 11, 2018 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA-002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for March 2018.

Maintenance on a circulating water pump caused an increase in turbidity and metals concentration in the Outfall 001 monthly sample due to disturbed sediment. These parameters, although elevated, did not exceed permit specifications for the month. There were no other 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 JT LePage 1025 Docket File PE20 WK Whitehead PE03 Columbia Files 964Y 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 9, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry & Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 03/01/2018 - 03/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Th 3/1/18 2.3 8.3 8.3 23.5 1-F 3/2/18 1.1 8.3 8.3 0 22.9 <0.1 <0.1 1-Sa 3/3/18 2.1 8.3 8.3 22.8 2-Su 3/4/18 2.0 8.2 8.4 22.9 2-M 3/5/18 1.4 8.3 8.3 0 22.9 <0.1 <0.1 2-T 3/6/18 3.0 8.3 8.3 22.6 21* 24* 2.1* 51*

2-W 3/7/18 0.9 8.3 8.3 0 22.1 <0.1 <0.1 2-Th 3/8/18 2.4 8.3 8.3 24.3 2-F 3/9/18 1.2 8.3 8.3 0 25.5 <0.1 <0.1 2-Sa 3/10/18 2.0 8.3 8.3 23.7 3-Su 3/11/18 2.0 8.3 8.3 23.4 3-M 3/12/18 0.7 8.3 8.3 0 23.8 <0.1 <0.1 3-T 3/13/18 2.6 8.3 8.4 25.3 3-W 3/14/18 0.8 8.3 8.3 0 25.4 <0.1 <0.1 3-Th 3/15/18 2.6 8.3 8.3 23.4 3-F 3/16/18 1.2 8.3 8.3 0 23.4 <0.1 <0.1 3-Sa 3/17/18 2.2 8.3 8.3 24.1 4-Su 3/18/18 2.2 8.3 8.3 24.4 4-M 3/19/18 1.2 8.3 8.3 0 24.7 <0.1 <0.1 4-T 3/20/18 2.2 8.3 8.3 23.9 4-W 3/21/18 1.1 8.3 8.3 0 23.9 <0.1 <0.1 4-Th 3/22/18 2.4 8.3 8.3 25.3 4-F 3/23/18 1.0 8.3 8.3 0 24.8 <0.1 <0.1 4-Sa 3/24/18 2.2 8.3 8.3 24.2 5-Su 3/25/18 2.2 8.3 8.3 23.5 5-M 3/26/18 1.1 8.3 8.3 0 23.5 <0.1 <0.1 5-T 3/27/18 2.3 8.3 8.3 26.4 5-W 3/28/18 1.1 8.3 8.3 0 25.6 <0.1 <0.1 5-Th 3/29/18 2.4 8.3 8.3 24.6 5-F 3/30/18 1.0 8.3 8.3 0 24.5 <0.1 <0.1 5-Sa 3/31/18 1.6 8.3 8.3 24.2 Instantaneous 8.2 Minimum >= 6.5 (RO) 1.8 2.1 51 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Th 3/1/18 1-F 3/2/18 1-Sa 3/3/18 2-Su 3/4/18 2-M 3/5/18 2-T 3/6/18 2-W 3/7/18 2-Th 3/8/18 2-F 3/9/18 2-Sa 3/10/18 3-Su 3/11/18 3-M 3/12/18 3-T 3/13/18 3-W 3/14/18 3-Th 3/15/18 3-F 3/16/18 3-Sa 3/17/18 4-Su 3/18/18 4-M 3/19/18 4-T 3/20/18 4-W 3/21/18 4-Th 3/22/18 4-F 3/23/18 4-Sa 3/24/18 5-Su 3/25/18 5-M 3/26/18 5-T 3/27/18 5-W 3/28/18 5-Th 3/29/18 5-F 3/30/18 5-Sa 3/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 3/6/2018 21 Results reported from a grab sample collected 3/6/2018 Measured NTU CWB Copper 3/6/2018 24 Results reported from a 24-hr composite sample collected Total 3/5/2018-3/6/2018. Metals elevated due disturbed Micrograms/L (ug/L) sediment caused by pump maintenance work.

CWB Chromium 3/6/2018 2.1 Results reported from a 24-hr composite sample collected Total 3/5/2018-3/6/2018. Metals elevated due disturbed Micrograms/L (ug/L) sediment caused by pump maintenance work.

CWB Zinc 3/6/2018 51 Results reported from a 24-hr composite sample collected Total 3/5/2018-3/6/2018. Metals elevated due disturbed Micrograms/L (ug/L) sediment caused by pump maintenance work.

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: 03/01/2018 - 03/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Th 3/1/18 23756 1-F 3/2/18 11256 1-Sa 3/3/18 24884 2-Su 3/4/18 24623 2-M 3/5/18 24761 2-T 3/6/18 24656 2-W 3/7/18 24656 2-Th 3/8/18 37156 2-F 3/9/18 24856 2-Sa 3/10/18 24263 3-Su 3/11/18 11256 3-M 3/12/18 24549 3-T 3/13/18 24856 3-W 3/14/18 11256 3-Th 3/15/18 11256 3-F 3/16/18 37656 3-Sa 3/17/18 38286 4-Su 3/18/18 24517 4-M 3/19/18 24865 4-T 3/20/18 31356 4-W 3/21/18 24556 4-Th 3/22/18 24756 4-F 3/23/18 24556 4-Sa 3/24/18 24582 5-Su 3/25/18 11256 5-M 3/26/18 11256 5-T 3/27/18 23756 5-W 3/28/18 25256 5-Th 3/29/18 24656 5-F 3/30/18 24356 5-Sa 3/31/18 24527 728233 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: 03/01/2018 - 03/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Th 3/1/18 22.1 1-F 3/2/18 20.7 1-Sa 3/3/18 20.2 2-Su 3/4/18 20.1 2-M 3/5/18 21.0 2-T 3/6/18 22.3 2-W 3/7/18 20.3 2-Th 3/8/18 22.7 2-F 3/9/18 21.9 2-Sa 3/10/18 22.0 3-Su 3/11/18 22.6 3-M 3/12/18 21.5 3-T 3/13/18 23.5 3-W 3/14/18 21.4 3-Th 3/15/18 23.1 3-F 3/16/18 21.1 3-Sa 3/17/18 22.5 4-Su 3/18/18 22.9 4-M 3/19/18 21.6 4-T 3/20/18 22.9 4-W 3/21/18 21.4 4-Th 3/22/18 23.1 4-F 3/23/18 21.0 4-Sa 3/24/18 22.9 5-Su 3/25/18 22.3 5-M 3/26/18 21.0 5-T 3/27/18 23.6 5-W 3/28/18 22.2 5-Th 3/29/18 23.7 5-F 3/30/18 22.8 5-Sa 3/31/18 21.4 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 GO2-18-074 DIC: 1316.20 DATE: May 14, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA-002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for April 2018.

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 May 7, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 04/01/2018 - 04/30/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Su 4/1/18 1.6 8.3 8.3 22.6 1-M 4/2/18 1.1 8.3 8.3 0 23.9 <0.1 <0.1 1-T 4/3/18 2.6 8.3 8.3 22.9 4.9* 12* <1* 25*

1-W 4/4/18 1.2 8.3 8.3 0 23.4 <0.1 <0.1 1-Th 4/5/18 2.1 8.3 8.3 24.5 1-F 4/6/18 2.1 8.3 8.3 25.1 1-Sa 4/7/18 2.1 8.3 8.3 25.8 2-Su 4/8/18 2.1 8.3 8.3 25.4 2-M 4/9/18 1.0 8.3 8.3 0 25.1 <0.1 <0.1 2-T 4/10/18 2.3 8.3 8.3 25.1 2-W 4/11/18 1.2 8.3 8.3 0 25.2 <0.1 <0.1 2-Th 4/12/18 2.3 8.2 8.3 24.6 2-F 4/13/18 1.3 8.3 8.3 0 24.8 <0.1 <0.1 2-Sa 4/14/18 2.0 8.3 8.3 25.5 3-Su 4/15/18 2.0 8.3 8.3 25.1 3-M 4/16/18 1.2 8.2 8.3 0 24.6 <0.1 <0.1 3-T 4/17/18 2.3 8.3 8.3 24.0 3-W 4/18/18 1.2 8.3 8.3 0 23.5 <0.1 <0.1 3-Th 4/19/18 2.4 8.3 8.3 23.3 3-F 4/20/18 1.1 8.3 8.3 0 23.5 <0.1 <0.1 3-Sa 4/21/18 2.1 8.3 8.3 23.9 4-Su 4/22/18 2.1 8.3 8.3 23.9 4-M 4/23/18 1.0 8.3 8.3 0 23.2 <0.1 <0.1 4-T 4/24/18 2.3 8.2 8.3 24.3 4-W 4/25/18 1.0 8.3 8.3 0 24.6 <0.1 <0.1 4-Th 4/26/18 2.4 8.3 8.3 26.3 4-F 4/27/18 1.1 8.3 8.3 0 26.6 <0.1 <0.1 4-Sa 4/28/18 1.7 8.3 8.3 26.0 5-Su 4/29/18 1.7 8.3 8.3 24.4 5-M 4/30/18 1.7 8.3 8.3 23.6 Instantaneous 8.2 Minimum >= 6.5 (RO) 1.74333 <1 25 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.3 Maximum <= 9.0 (RO) 0 Monthly Total

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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Su 4/1/18 1-M 4/2/18 1-T 4/3/18 1-W 4/4/18 1-Th 4/5/18 1-F 4/6/18 1-Sa 4/7/18 2-Su 4/8/18 2-M 4/9/18 2-T 4/10/18 2-W 4/11/18 2-Th 4/12/18 2-F 4/13/18 2-Sa 4/14/18 3-Su 4/15/18 3-M 4/16/18 3-T 4/17/18 3-W 4/18/18 3-Th 4/19/18 3-F 4/20/18 3-Sa 4/21/18 4-Su 4/22/18 4-M 4/23/18 4-T 4/24/18 4-W 4/25/18 4-Th 4/26/18 4-F 4/27/18 4-Sa 4/28/18 5-Su 4/29/18 5-M 4/30/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 4/3/2018 4.9 Results reported from a grab sample taken 4/3/2018 Measured NTU CWB Copper 4/3/2018 12 Results reported from a 24-hr composite sample collected Total 4/2/2018-4/3/2018 Micrograms/L (ug/L)

CWB Chromium 4/3/2018 Bl<1 Results reported from a 24-hr composite sample collected Total 4/2/2018-4/3/2018 Micrograms/L (ug/L)

CWB Zinc 4/3/2018 25 Results reported from a 24-hr composite sample collected Total 4/2/2018-4/3/2018 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: 04/01/2018 - 04/30/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Su 4/1/18 27407 1-M 4/2/18 14458 1-T 4/3/18 27658 1-W 4/4/18 28058 1-Th 4/5/18 27758 1-F 4/6/18 27958 1-Sa 4/7/18 14458 2-Su 4/8/18 27758 2-M 4/9/18 27858 2-T 4/10/18 27958 2-W 4/11/18 14458 2-Th 4/12/18 14458 2-F 4/13/18 27458 2-Sa 4/14/18 27670 3-Su 4/15/18 28014 3-M 4/16/18 27790 3-T 4/17/18 14458 3-W 4/18/18 27558 3-Th 4/19/18 27658 3-F 4/20/18 27658 3-Sa 4/21/18 14458 4-Su 4/22/18 14458 4-M 4/23/18 27758 4-T 4/24/18 14458 4-W 4/25/18 14458 4-Th 4/26/18 14458 4-F 4/27/18 29558 4-Sa 4/28/18 29997 5-Su 4/29/18 29949 5-M 4/30/18 14458 692519 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: 04/01/2018 - 04/30/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Su 4/1/18 22.4 1-M 4/2/18 21.5 1-T 4/3/18 22.9 1-W 4/4/18 21.7 1-Th 4/5/18 22.7 1-F 4/6/18 22.6 1-Sa 4/7/18 22.9 2-Su 4/8/18 23.5 2-M 4/9/18 21.6 2-T 4/10/18 23.4 2-W 4/11/18 21.9 2-Th 4/12/18 23.1 2-F 4/13/18 21.7 2-Sa 4/14/18 23.7 3-Su 4/15/18 23.0 3-M 4/16/18 21.7 3-T 4/17/18 23.3 3-W 4/18/18 21.9 3-Th 4/19/18 24.2 3-F 4/20/18 21.1 3-Sa 4/21/18 24.0 4-Su 4/22/18 23.2 4-M 4/23/18 22.5 4-T 4/24/18 24.4 4-W 4/25/18 23.6 4-Th 4/26/18 25.8 4-F 4/27/18 22.7 4-Sa 4/28/18 20.3 5-Su 4/29/18 20.6 5-M 4/30/18 22.6 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 GO2-18-084 DIC: 1316.20 DATE: June 12, 2018 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for May 2018.

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 August 23, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Mary Ramos, Environmental Scientist, E&RP Approved by: Shannon Khounnala, Manager, E&RP

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: 05/01/2018 - 05/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-T 5/1/18 1.7 8.3 8.3 23.9 1-W 5/2/18 1.4 8.3 8.3 24.8 1-Th 5/3/18 1.6 8.3 8.3 25.3 1-F 5/4/18 0.6 8.3 8.3 0 25.7 <0.1 <0.1 1-Sa 5/5/18 2.4 8.3 8.3 27.4 2-Su 5/6/18 2.4 8.2 8.3 27.6 9.3* 14* <1* 24*

2-M 5/7/18 1.2 8.2 8.3 0 27.2 <0.1 <0.1 2-T 5/8/18 2.2 8.2 8.3 27.8 2-W 5/9/18 1.1 8.2 8.3 0 28.5 <0.1 <0.1 2-Th 5/10/18 2.4 8.2 8.3 28.4 2-F 5/11/18 0.9 8.2 8.3 0 28.2 <0.1 <0.1 2-Sa 5/12/18 1.8 8.2 8.3 28.4 3-Su 5/13/18 1.8 8.2 8.3 29.0 3-M 5/14/18 1.1 8.2 8.3 0 29.1 <0.1 <0.1 3-T 5/15/18 2.2 8.2 8.3 29.8 3-W 5/16/18 0.7 8.2 8.3 0 29.8 <0.1 <0.1 3-Th 5/17/18 2.7 8.2 8.3 30.3 3-F 5/18/18 3.3 7.8 8.2 30.3 3-Sa 5/19/18 4.4 7.6 7.9 18.0 4-Su 5/20/18 5.4 7.9 8.0 18.9 4-M 5/21/18 5.5 8.0 8.1 18.6 4-T 5/22/18 5.3 8.0 8.1 19.6 4-W 5/23/18 4.8 8.0 8.2 20.5 4-Th 5/24/18 4.4 7.9 8.2 23.5 4-F 5/25/18 0.9 8.2 8.2 0 24.1 <0.1 <0.1 4-Sa 5/26/18 1.7 8.2 8.2 24.5 5-Su 5/27/18 1.7 8.2 8.2 25.1 5-M 5/28/18 0.8 8.2 8.2 0 25.4 <0.1 <0.1 5-T 5/29/18 1.6 7.8 8.2 25.2 5-W 5/30/18 0.5 8.2 8.2 0 24.7 <0.1 <0.1 5-Th 5/31/18 1.5 8.0 8.3 23.7 Instantaneous 7.6 Minimum >= 6.5 (RO) 2.3 <1 24 Average Monthly

<= 5.6 <= 8.2 <= 53 Instantaneous 8.3 Maximum <= 9.0 (RO) 0 Monthly Total

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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-T 5/1/18 1-W 5/2/18 1-Th 5/3/18 1-F 5/4/18 1-Sa 5/5/18 2-Su 5/6/18 2-M 5/7/18 2-T 5/8/18 2-W 5/9/18 2-Th 5/10/18 2-F 5/11/18 2-Sa 5/12/18 3-Su 5/13/18 3-M 5/14/18 3-T 5/15/18 3-W 5/16/18 3-Th 5/17/18 3-F 5/18/18 3-Sa 5/19/18 4-Su 5/20/18 4-M 5/21/18 4-T 5/22/18 4-W 5/23/18 4-Th 5/24/18 4-F 5/25/18 4-Sa 5/26/18 5-Su 5/27/18 5-M 5/28/18 5-T 5/29/18 5-W 5/30/18 5-Th 5/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 5/6/2018 9.3 Results reported from a grab sample taken 5/6/2018 Measured NTU CWB Copper 5/6/2018 14 Results reported from a 24-hr composite sample collected Total 5/5/2018-5/6/2018 Micrograms/L (ug/L)

CWB Chromium 5/6/2018 Bl<1 Results reported from a 24-hr composite sample collected Total 5/5/2018-5/6/2018 Micrograms/L (ug/L)

CWB Zinc 5/6/2018 24 Results reported from a 24-hr composite sample collected Total 5/5/2018-5/6/2018 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: 05/01/2018 - 05/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-T 5/1/18 36399 1-W 5/2/18 36799 1-Th 5/3/18 36699 1-F 5/4/18 36599 1-Sa 5/5/18 20799 2-Su 5/6/18 36094 2-M 5/7/18 20799 2-T 5/8/18 36699 2-W 5/9/18 36499 2-Th 5/10/18 20799 2-F 5/11/18 20799 2-Sa 5/12/18 52269 3-Su 5/13/18 46982 3-M 5/14/18 46446 3-T 5/15/18 33299 3-W 5/16/18 44949 3-Th 5/17/18 33249 3-F 5/18/18 46099 3-Sa 5/19/18 20799 4-Su 5/20/18 20799 4-M 5/21/18 33385 4-T 5/22/18 44976 4-W 5/23/18 49936 4-Th 5/24/18 34999 4-F 5/25/18 35599 4-Sa 5/26/18 35588 5-Su 5/27/18 20799 5-M 5/28/18 54310 5-T 5/29/18 36199 5-W 5/30/18 34899 5-Th 5/31/18 33399 1.09796e Monthly Total +006 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: 05/01/2018 - 05/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-T 5/1/18 24.0 1-W 5/2/18 23.6 1-Th 5/3/18 24.8 1-F 5/4/18 23.9 1-Sa 5/5/18 25.7 2-Su 5/6/18 24.9 2-M 5/7/18 23.7 2-T 5/8/18 25.5 2-W 5/9/18 21.4 2-Th 5/10/18 24.8 2-F 5/11/18 22.3 2-Sa 5/12/18 24.8 3-Su 5/13/18 25.0 3-M 5/14/18 24.5 3-T 5/15/18 25.9 3-W 5/16/18 23.3 3-Th 5/17/18 25.4 3-F 5/18/18 9.1 3-Sa 5/19/18 6.4 4-Su 5/20/18 1.9 4-M 5/21/18 4.8 4-T 5/22/18 6.4 4-W 5/23/18 5.6 4-Th 5/24/18 13.6 4-F 5/25/18 15.6 4-Sa 5/26/18 16.6 5-Su 5/27/18 16.7 5-M 5/28/18 16.6 5-T 5/29/18 16.8 5-W 5/30/18 15.2 5-Th 5/31/18 16.1 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

INTEROFFICE MEMO GO2-18-093 DIC: 1316.20 DATE: July 12, 2018 TO: Columbia Generating Station (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for June 2018.

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 July 12, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

INTEROFFICE MEMO GO2-18-105 DIC: 1316.20 DATE: August 14, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for July 2018.

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 August 14, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 07/01/2018 - 07/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Su 7/1/18 2.0 8.2 8.2 29.7 1-M 7/2/18 0.7 8.2 8.2 0 28.3 6.5* 16* 1.2* 20* <0.1 <0.1 1-T 7/3/18 2.4 8.2 8.2 28.8 1-W 7/4/18 1.1 8.2 8.2 0 28.7 <0.1 <0.1 1-Th 7/5/18 2.0 8.2 8.2 30.6 1-F 7/6/18 1.0 8.2 8.2 0 31.1 <0.1 <0.1 1-Sa 7/7/18 2.2 8.2 8.2 30.6 2-Su 7/8/18 2.2 8.2 8.2 29.4 2-M 7/9/18 0.6 8.2 8.2 0 29.7 <0.1 <0.1 2-T 7/10/18 2.4 8.2 8.2 29.8 2-W 7/11/18 0.7 8.2 8.2 0 29.7 <0.1 <0.1 2-Th 7/12/18 2.8 8.2 8.2 31.6 2-F 7/13/18 1.6 8.2 8.2 0 31.7 <0.1 <0.1 2-Sa 7/14/18 3.0 8.2 8.2 31.9 3-Su 7/15/18 3.0 8.2 8.2 30.3 3-M 7/16/18 1.1 8.2 8.2 0 30.9 <0.1 <0.1 3-T 7/17/18 5.1 8.2 8.2 31.8 3-W 7/18/18 2.7 8.2 8.2 0 31.7 <0.1 <0.1 3-Th 7/19/18 4.4 8.2 8.2 31.4 3-F 7/20/18 1.6 8.2 8.2 0 30.0 <0.1 <0.1 3-Sa 7/21/18 2.3 8.2 8.2 29.7 4-Su 7/22/18 2.3 8.2 8.2 30.0 4-M 7/23/18 1.4 8.2 8.2 0 30.3 <0.1 <0.1 4-T 7/24/18 2.3 8.2 8.2 30.9 4-W 7/25/18 2.7 8.2 8.2 0 31.6 <0.1 <0.1 4-Th 7/26/18 4.7 8.2 8.2 31.6 4-F 7/27/18 2.9 8.2 8.2 0 31.9 <0.1 <0.1 4-Sa 7/28/18 4.8 8.2 8.2 31.9 5-Su 7/29/18 4.9 8.2 8.2 32.0 5-M 7/30/18 2.7 8.2 8.2 0 31.7 <0.1 <0.1 5-T 7/31/18 4.9 8.2 8.2 33.1 Instantaneous 8.2 Minimum >= 6.5 (RO) 2.5 1.2 20 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Su 7/1/18 1-M 7/2/18 1-T 7/3/18 1-W 7/4/18 1-Th 7/5/18 1-F 7/6/18 1-Sa 7/7/18 2-Su 7/8/18 2-M 7/9/18 2-T 7/10/18 2-W 7/11/18 2-Th 7/12/18 2-F 7/13/18 2-Sa 7/14/18 3-Su 7/15/18 3-M 7/16/18 3-T 7/17/18 3-W 7/18/18 3-Th 7/19/18 3-F 7/20/18 3-Sa 7/21/18 4-Su 7/22/18 4-M 7/23/18 4-T 7/24/18 4-W 7/25/18 4-Th 7/26/18 4-F 7/27/18 4-Sa 7/28/18 5-Su 7/29/18 5-M 7/30/18 5-T 7/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 7/2/2018 6.5 Results reported from a grab sample taken 7/2/2018 Measured NTU CWB Copper 7/2/2018 16 Results reported from a 24-hour composite sample Total collected 7/1/2018-7/2/2018 Micrograms/L (ug/L)

CWB Chromium 7/2/2018 1.2 Results reported from a 24-hour composite sample Total collected 7/1/2018-7/2/2018 Micrograms/L (ug/L)

CWB Zinc 7/2/2018 20 Results reported from a 24-hour composite sample Total collected 7/1/2018-7/2/2018 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: 07/01/2018 - 07/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Su 7/1/18 34393 1-M 7/2/18 33506 1-T 7/3/18 34100 1-W 7/4/18 34153 1-Th 7/5/18 34439 1-F 7/6/18 33697 1-Sa 7/7/18 18253 2-Su 7/8/18 34194 2-M 7/9/18 18253 2-T 7/10/18 34026 2-W 7/11/18 49780 2-Th 7/12/18 18253 2-F 7/13/18 33638 2-Sa 7/14/18 33899 3-Su 7/15/18 34053 3-M 7/16/18 18253 3-T 7/17/18 33353 3-W 7/18/18 33794 3-Th 7/19/18 34112 3-F 7/20/18 18253 3-Sa 7/21/18 34187 4-Su 7/22/18 33384 4-M 7/23/18 18253 4-T 7/24/18 50095 4-W 7/25/18 18253 4-Th 7/26/18 48353 4-F 7/27/18 34453 4-Sa 7/28/18 34826 5-Su 7/29/18 18253 5-M 7/30/18 35880 5-T 7/31/18 18253 960592 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: 07/01/2018 - 07/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Su 7/1/18 21.2 1-M 7/2/18 24.4 1-T 7/3/18 24.7 1-W 7/4/18 24.5 1-Th 7/5/18 26.3 1-F 7/6/18 25.3 1-Sa 7/7/18 25.9 2-Su 7/8/18 26.1 2-M 7/9/18 25.0 2-T 7/10/18 26.4 2-W 7/11/18 24.4 2-Th 7/12/18 27.2 2-F 7/13/18 26.7 2-Sa 7/14/18 27.5 3-Su 7/15/18 27.5 3-M 7/16/18 25.8 3-T 7/17/18 30.5 3-W 7/18/18 28.1 3-Th 7/19/18 28.2 3-F 7/20/18 25.9 3-Sa 7/21/18 27.1 4-Su 7/22/18 26.3 4-M 7/23/18 26.5 4-T 7/24/18 28.0 4-W 7/25/18 28.2 4-Th 7/26/18 29.1 4-F 7/27/18 30.1 4-Sa 7/28/18 29.7 5-Su 7/29/18 31.2 5-M 7/30/18 28.7 5-T 7/31/18 29.5 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 GO2-18-115 DIC: 1316.20 DATE: September 13, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for August 2018. 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)

September 13, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 08/01/2018 - 08/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-W 8/1/18 2.3 8.1 8.2 0 32.3 <0.1 <0.1 1-Th 8/2/18 2.8 8.1 8.2 31.4 1-F 8/3/18 1.9 8.2 8.2 0 30.8 <0.1 <0.1 1-Sa 8/4/18 2.9 8.1 8.2 30.2 2-Su 8/5/18 2.9 8.1 8.2 30.5 2-M 8/6/18 1.4 8.1 8.2 0 30.9 <0.1 <0.1 2-T 8/7/18 3.2 8.1 8.2 31.4 2.5* 12* 1.3* 13*

2-W 8/8/18 2.2 8.2 8.2 0 31.9 <0.1 <0.1 2-Th 8/9/18 4.9 8.1 8.2 32.6 2-F 8/10/18 2.6 8.1 8.2 0 33.4 <0.1 <0.1 2-Sa 8/11/18 4.7 8.1 8.2 32.8 3-Su 8/12/18 4.7 8.1 8.2 31.3 3-M 8/13/18 1.4 8.1 8.2 0 30.5 <0.1 <0.1 3-T 8/14/18 2.9 8.1 8.2 30.7 3-W 8/15/18 1.4 8.1 8.2 0 30.8 <0.1 <0.1 3-Th 8/16/18 2.9 8.1 8.2 32.1 3-F 8/17/18 2.0 8.1 8.2 0 31.8 <0.1 <0.1 3-Sa 8/18/18 2.8 8.1 8.2 32.0 4-Su 8/19/18 2.8 8.1 8.2 31.9 4-M 8/20/18 1.4 8.1 8.2 0 32.5 <0.1 <0.1 4-T 8/21/18 2.9 8.1 8.2 32.5 4-W 8/22/18 1.6 8.1 8.2 0 32.0 <0.1 <0.1 4-Th 8/23/18 2.9 8.1 8.2 32.6 4-F 8/24/18 1.5 8.1 8.2 0 32.2 <0.1 <0.1 4-Sa 8/25/18 2.9 8.1 8.2 31.1 5-Su 8/26/18 2.8 8.1 8.2 30.7 5-M 8/27/18 1.1 8.1 8.2 0 31.0 <0.1 <0.1 5-T 8/28/18 1.7 8.1 8.2 30.4 5-W 8/29/18 1.0 8.1 8.2 0 30.6 <0.1 <0.1 5-Th 8/30/18 1.9 8.1 8.2 31.2 5-F 8/31/18 1.1 8.1 8.2 0 31.3 <0.1 <0.1 Instantaneous 8.1 Minimum >= 6.5 (RO) 2.4 1.3 13 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-W 8/1/18 1-Th 8/2/18 1-F 8/3/18 1-Sa 8/4/18 2-Su 8/5/18 2-M 8/6/18 2-T 8/7/18 2-W 8/8/18 2-Th 8/9/18 2-F 8/10/18 2-Sa 8/11/18 3-Su 8/12/18 3-M 8/13/18 3-T 8/14/18 3-W 8/15/18 3-Th 8/16/18 3-F 8/17/18 3-Sa 8/18/18 4-Su 8/19/18 4-M 8/20/18 4-T 8/21/18 4-W 8/22/18 4-Th 8/23/18 4-F 8/24/18 4-Sa 8/25/18 5-Su 8/26/18 5-M 8/27/18 5-T 8/28/18 5-W 8/29/18 5-Th 8/30/18 5-F 8/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 8/7/2018 2.5 Results reported from a grab sample taken 8/7/2018 Measured NTU CWB Copper 8/7/2018 12 Results reported from a 24-hour composite sample Total collected 8/6/2018-8/7/2018 Micrograms/L (ug/L)

CWB Chromium 8/7/2018 1.3 Results reported from a 24-hour composite sample Total collected 8/6/2018-8/7/2018 Micrograms/L (ug/L)

CWB Zinc 8/7/2018 13 Results reported from a 24-hour composite sample Total collected 8/6/2018-8/7/2018 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: 08/01/2018 - 08/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-W 8/1/18 41917 1-Th 8/2/18 24817 1-F 8/3/18 41617 1-Sa 8/4/18 24817 2-Su 8/5/18 24817 2-M 8/6/18 41318 2-T 8/7/18 41117 2-W 8/8/18 24817 2-Th 8/9/18 41517 2-F 8/10/18 41317 2-Sa 8/11/18 41417 3-Su 8/12/18 24817 3-M 8/13/18 41217 3-T 8/14/18 41417 3-W 8/15/18 41217 3-Th 8/16/18 41417 3-F 8/17/18 24817 3-Sa 8/18/18 41279 4-Su 8/19/18 57801 4-M 8/20/18 24817 4-T 8/21/18 40917 4-W 8/22/18 24817 4-Th 8/23/18 41217 4-F 8/24/18 40917 4-Sa 8/25/18 41217 5-Su 8/26/18 41317 5-M 8/27/18 41117 5-T 8/28/18 41209 5-W 8/29/18 41325 5-Th 8/30/18 41417 5-F 8/31/18 41117 1164874 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: 08/01/2018 - 08/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-W 8/1/18 27.6 1-Th 8/2/18 27.3 1-F 8/3/18 25.5 1-Sa 8/4/18 25.1 2-Su 8/5/18 26.3 2-M 8/6/18 26.3 2-T 8/7/18 28.9 2-W 8/8/18 27.4 2-Th 8/9/18 30.5 2-F 8/10/18 28.2 2-Sa 8/11/18 29.0 3-Su 8/12/18 28.2 3-M 8/13/18 25.5 3-T 8/14/18 26.8 3-W 8/15/18 25.3 3-Th 8/16/18 27.5 3-F 8/17/18 27.2 3-Sa 8/18/18 26.8 4-Su 8/19/18 27.2 4-M 8/20/18 25.7 4-T 8/21/18 26.7 4-W 8/22/18 25.8 4-Th 8/23/18 26.7 4-F 8/24/18 25.0 4-Sa 8/25/18 25.3 5-Su 8/26/18 25.3 5-M 8/27/18 23.8 5-T 8/28/18 24.7 5-W 8/29/18 24.4 5-Th 8/30/18 25.3 5-F 8/31/18 23.9 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 GO2-18-127 DIC: 1316.20 DATE: October 15, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for September 2018. 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)

October 15, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 09/01/2018 - 09/30/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Sa 9/1/18 1.9 8.1 8.2 31.3 2-Su 9/2/18 1.9 8.1 8.2 30.3 2-M 9/3/18 0.7 8.2 8.2 0 29.9 <0.1 <0.1 2-T 9/4/18 2.5 8.2 8.2 29.1 3.3* 13* 1.1* 14*

2-W 9/5/18 1.1 8.2 8.2 0 27.1 <0.1 <0.1 2-Th 9/6/18 2.4 8.2 8.2 27.5 2-F 9/7/18 1.2 8.2 8.2 0 28.1 <0.1 <0.1 2-Sa 9/8/18 2.2 8.2 8.2 28.9 3-Su 9/9/18 2.3 8.2 8.2 27.8 3-M 9/10/18 1.1 8.2 8.2 0 27.6 <0.1 <0.1 3-T 9/11/18 2.3 8.2 8.2 26.9 3-W 9/12/18 0.7 8.2 8.2 0 26.9 <0.1 <0.1 3-Th 9/13/18 2.3* 8.2 8.2 26.6 3-F 9/14/18 1.2 8.2 8.2 26.6 3-Sa 9/15/18 2.2 8.2 8.2 26.6 4-Su 9/16/18 2.2 8.2 8.2 27.7 4-M 9/17/18 0.4 8.2 8.2 0 27.6 <0.1 <0.1 4-T 9/18/18 2.5 8.2 8.2 26.1 4-W 9/19/18 1.2 8.2 8.2 0 26.1 <0.1 <0.1 4-Th 9/20/18 2.4 8.2 8.2 26.7 4-F 9/21/18 1.2 8.2 8.2 0 27.0 <0.1 <0.1 4-Sa 9/22/18 2.1 8.2 8.2 27.6 5-Su 9/23/18 2.1 8.2 8.2 27.8 5-M 9/24/18 0.7 8.2 8.2 0 25.5 <0.1 <0.1 5-T 9/25/18 2.4 8.2 8.2 25.7 5-W 9/26/18 0.7 8.2 8.2 0 25.8 <0.1 <0.1 5-Th 9/27/18 2.5 8.2 8.2 26.8 5-F 9/28/18 1.2 8.2 8.2 0 26.9 <0.1 <0.1 5-Sa 9/29/18 2.1 8.2 8.2 26.4 6-Su 9/30/18 2.1 8.2 8.2 26.5 Instantaneous 8.1 Minimum >= 6.5 (RO) 1.7 1.1 14 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Sa 9/1/18 2-Su 9/2/18 2-M 9/3/18 2-T 9/4/18 2-W 9/5/18 2-Th 9/6/18 2-F 9/7/18 2-Sa 9/8/18 3-Su 9/9/18 3-M 9/10/18 3-T 9/11/18 3-W 9/12/18 3-Th 9/13/18 3-F 9/14/18 3-Sa 9/15/18 4-Su 9/16/18 4-M 9/17/18 4-T 9/18/18 4-W 9/19/18 4-Th 9/20/18 4-F 9/21/18 4-Sa 9/22/18 5-Su 9/23/18 5-M 9/24/18 5-T 9/25/18 5-W 9/26/18 5-Th 9/27/18 5-F 9/28/18 5-Sa 9/29/18 6-Su 9/30/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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 Flow 9/13/2018 2.3 Fire Protection storage tank drained to CW basin 9/13/2018-9/16/2018 (0.4 MG total volume)

Million Gallons/Day CWB Turbidity (Nephelometric) 9/4/2018 3.3 Results reported from a grab sample taken 9/4/2018 Measured NTU CWB Copper 9/4/2018 13 Results reported from a 24-hour composite sample Total collected 9/3/2018-9/4/2018 Micrograms/L (ug/L)

CWB Chromium 9/4/2018 1.1 Results reported from a 24-hour composite sample Total collected 9/3/2018-9/4/2018 Micrograms/L (ug/L)

CWB Zinc 9/4/2018 14 Results reported from a 24-hour composite sample Total collected 9/3/2018-9/4/2018 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the SSW ponds directly to blowdown line Outfall 001. Intermittent Standby Service Water pump-over to CW tower basin for SSW pond cleaning started on 9/5/2018 ended 9/24/2018 (M-F).

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: 09/01/2018 - 09/30/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Sa 9/1/18 40329 2-Su 9/2/18 23674 2-M 9/3/18 40519 2-T 9/4/18 23674 2-W 9/5/18 40674 2-Th 9/6/18 23674 2-F 9/7/18 23674 2-Sa 9/8/18 23674 3-Su 9/9/18 23674 3-M 9/10/18 40287 3-T 9/11/18 23674 3-W 9/12/18 23674 3-Th 9/13/18 23674 3-F 9/14/18 40058 3-Sa 9/15/18 23674 4-Su 9/16/18 40072 4-M 9/17/18 23674 4-T 9/18/18 56474 4-W 9/19/18 23674 4-Th 9/20/18 40005 4-F 9/21/18 39974 4-Sa 9/22/18 39974 5-Su 9/23/18 23674 5-M 9/24/18 39777 5-T 9/25/18 23674 5-W 9/26/18 40263 5-Th 9/27/18 40074 5-F 9/28/18 40074 5-Sa 9/29/18 40139 6-Su 9/30/18 23674 973803 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: 09/01/2018 - 09/30/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Sa 9/1/18 24.9 2-Su 9/2/18 24.8 2-M 9/3/18 24.0 2-T 9/4/18 24.7 2-W 9/5/18 24.9 2-Th 9/6/18 24.7 2-F 9/7/18 25.3 2-Sa 9/8/18 25.3 3-Su 9/9/18 25.2 3-M 9/10/18 24.2 3-T 9/11/18 24.8 3-W 9/12/18 23.0 3-Th 9/13/18 24.5 3-F 9/14/18 23.7 3-Sa 9/15/18 24.3 4-Su 9/16/18 25.1 4-M 9/17/18 22.6 4-T 9/18/18 25.0 4-W 9/19/18 23.0 4-Th 9/20/18 24.9 4-F 9/21/18 24.2 4-Sa 9/22/18 25.2 5-Su 9/23/18 24.3 5-M 9/24/18 22.8 5-T 9/25/18 24.7 5-W 9/26/18 22.9 5-Th 9/27/18 25.5 5-F 9/28/18 24.2 5-Sa 9/29/18 24.6 6-Su 9/30/18 23.9 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 GO2-18-141 DIC: 1316.20 DATE: November 14, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for October 2018. 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)

November 14, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 10/01/2018 - 10/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-M 10/1/18 0.6 8.2 8.2 26.5 <0.1 <0.1 1-T 10/2/18 2.3 8.2 8.2 29.2 3.8* 17* 1.0* 13*

1-W 10/3/18 1.0 8.2 8.2 28.2 <0.1 <0.1 1-Th 10/4/18 2.2 8.2 8.2 26.6 1-F 10/5/18 1.1 8.1 8.3 26.7 <0.1 <0.1 1-Sa 10/6/18 1.9 8.1 8.2 27.6 2-Su 10/7/18 1.9 8.0 8.3 27.9 2-M 10/8/18 0.7 8.2 8.2 28.1 <0.1 <0.1 2-T 10/9/18 2.4 8.1 8.2 28.3 2-W 10/10/18 1.5 8.1 8.2 27.9 <0.1 <0.1 2-Th 10/11/18 3.9 8.2 8.2 27.9 2-F 10/12/18 1.7 8.2 8.2 28.8 <0.1 <0.1 2-Sa 10/13/18 2.4 8.2 8.2 28.7 3-Su 10/14/18 2.4 8.2 8.2 27.2 3-M 10/15/18 1.6 8.2 8.2 25.7 <0.1 <0.1 3-T 10/16/18 3.3 8.2 8.3 26.1 3-W 10/17/18 0.9 8.2 8.2 25.6 <0.1 <0.1 3-Th 10/18/18 3.6 8.2 8.2 26.3 3-F 10/19/18 1.7 8.2 8.3 26.2 <0.1 <0.1 3-Sa 10/20/18 2.9 7.9 8.3 26.3 4-Su 10/21/18 2.9 7.9 8.4 26.2 4-M 10/22/18 1.0 8.1 8.2 26.3 <0.1 <0.1 4-T 10/23/18 3.2 8.2 8.3 27.2 4-W 10/24/18 1.0 8.2 8.2 27.1 <0.1 <0.1 4-Th 10/25/18 3.3 8.2 8.4 27.5 4-F 10/26/18 2.1 8.2 8.2 30.0 <0.1 <0.1 4-Sa 10/27/18 3.8 8.2 8.2 28.1 5-Su 10/28/18 3.3 8.2 8.2 28.1 5-M 10/29/18 0.2 8.2 8.2 26.0 <0.1 <0.1 5-T 10/30/18 1.8 8.1 8.2 25.7 5-W 10/31/18 0.5 8.1 8.2 26.0 <0.1 <0.1 Instantaneous 7.9 Minimum >= 6.5 (RO) 2.0 1 13 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-M 10/1/18 1-T 10/2/18 1-W 10/3/18 1-Th 10/4/18 1-F 10/5/18 1-Sa 10/6/18 2-Su 10/7/18 2-M 10/8/18 2-T 10/9/18 2-W 10/10/18 2-Th 10/11/18 2-F 10/12/18 2-Sa 10/13/18 3-Su 10/14/18 3-M 10/15/18 3-T 10/16/18 3-W 10/17/18 3-Th 10/18/18 3-F 10/19/18 3-Sa 10/20/18 4-Su 10/21/18 4-M 10/22/18 4-T 10/23/18 4-W 10/24/18 4-Th 10/25/18 4-F 10/26/18 4-Sa 10/27/18 5-Su 10/28/18 5-M 10/29/18 5-T 10/30/18 5-W 10/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 10/2/2018 3.8 Results reported from a grab sample taken 10/2/2018 Measured NTU CWB Copper 10/2/2018 17 Results reported from a 24-hour composite sample Total collected 10/1/2018-10/2/2018 Micrograms/L (ug/L)

CWB Chromium 10/2/2018 1.0 Results reported from a 24-hour composite sample Total collected 10/1/2018-10/2/2018 Micrograms/L (ug/L)

CWB Zinc 10/2/2018 13 Results reported from a 24-hour composite sample Total collected 10/1/2018-10/2/2018 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the SSW ponds directly to blowdown line Outfall 001.

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: 10/01/2018 - 10/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-M 10/1/18 34216 1-T 10/2/18 50451 1-W 10/3/18 50596 1-Th 10/4/18 50636 1-F 10/5/18 34216 1-Sa 10/6/18 50716 2-Su 10/7/18 50216 2-M 10/8/18 34216 2-T 10/9/18 34216 2-W 10/10/18 50616 2-Th 10/11/18 50116 2-F 10/12/18 50716 2-Sa 10/13/18 50917 3-Su 10/14/18 50834 3-M 10/15/18 50897 3-T 10/16/18 34216 3-W 10/17/18 50616 3-Th 10/18/18 34216 3-F 10/19/18 50416 3-Sa 10/20/18 34216 4-Su 10/21/18 34216 4-M 10/22/18 34216 4-T 10/23/18 34216 4-W 10/24/18 34216 4-Th 10/25/18 34216 4-F 10/26/18 61016 4-Sa 10/27/18 73604 5-Su 10/28/18 74050 5-M 10/29/18 34216 5-T 10/30/18 34216 5-W 10/31/18 72394 1.41783e Monthly Total +006 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: 10/01/2018 - 10/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-M 10/1/18 23.0 1-T 10/2/18 25.4 1-W 10/3/18 22.1 1-Th 10/4/18 23.6 1-F 10/5/18 21.4 1-Sa 10/6/18 22.8 2-Su 10/7/18 22.7 2-M 10/8/18 21.4 2-T 10/9/18 23.2 2-W 10/10/18 22.9 2-Th 10/11/18 24.6 2-F 10/12/18 22.8 2-Sa 10/13/18 24.2 3-Su 10/14/18 23.0 3-M 10/15/18 21.6 3-T 10/16/18 23.9 3-W 10/17/18 21.2 3-Th 10/18/18 23.7 3-F 10/19/18 22.1 3-Sa 10/20/18 23.2 4-Su 10/21/18 23.2 4-M 10/22/18 20.7 4-T 10/23/18 23.5 4-W 10/24/18 21.5 4-Th 10/25/18 24.1 4-F 10/26/18 23.7 4-Sa 10/27/18 24.2 5-Su 10/28/18 23.7 5-M 10/29/18 20.1 5-T 10/30/18 21.3 5-W 10/31/18 20.6 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 GO2-18-151 DIC: 1316.20 DATE: December 12, 2018 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station NOVEMBER 2018 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for November 2018. 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 December 12, 2018 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Michael Davis, Manager, Chemistry and Radiation Safety Approved by: Shannon Khounnala, Manager, E&RP

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: 11/01/2018 - 11/30/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Th 11/1/18 2.0 8.1 8.2 28.2 1-F 11/2/18 1.0 8.2 8.2 0 28.1 <0.1 <0.1 1-Sa 11/3/18 2.1 8.2 8.2 27.3 2-Su 11/4/18 2.1 8.2 8.4 27.5 2-M 11/5/18 1.0 8.2 8.3 0 26.8 <0.1 <0.1 2-T 11/6/18 4.9 8.2 8.3 26.2 5.2* 14* <1* 16*

2-W 11/7/18 1.7 8.2 8.3 0 24.9 <0.1 <0.1 2-Th 11/8/18 5.0 8.1 8.3 25.0 2-F 11/9/18 1.2 8.2 8.4 0 23.5 <0.1 <0.1 2-Sa 11/10/18 3.7 8.2 8.5 23.7 3-Su 11/11/18 3.7 8.3 8.4 23.1 3-M 11/12/18 1.2 8.1 8.4 0 22.5 <0.1 <0.1 3-T 11/13/18 1.7 8.2 8.5 22.6 3-W 11/14/18 1.3 8.3 8.4 0 23.2 <0.1 <0.1 3-Th 11/15/18 3.6 8.2 8.3 23.7 3-F 11/16/18 1.1 8.2 8.3 0 23.6 <0.1 <0.1 3-Sa 11/17/18 1.5 8.2 8.3 25.3 4-Su 11/18/18 1.5 8.2 8.3 23.8 4-M 11/19/18 0.3 8.3 8.3 0 22.8 <0.1 <0.1 4-T 11/20/18 1.9 7.9 8.4 23.9 4-W 11/21/18 1.6 8.2 8.3 0 23.9 <0.1 <0.1 4-Th 11/22/18 1.9 8.3 8.4 28.4 4-F 11/23/18 1.0 8.2 8.4 0 24.8 <0.1 <0.1 4-Sa 11/24/18 1.9 8.2 8.2 24.8 5-Su 11/25/18 1.9 8.1 8.4 24.6 5-M 11/26/18 1.0 8.1 8.4 0 23.8 <0.1 <0.1 5-T 11/27/18 2.2 8.1 8.3 25.1 5-W 11/28/18 0.6 8.2 8.4 0 25.1 <0.1 <0.1 5-Th 11/29/18 2.3 8.2 8.3 24.7 5-F 11/30/18 1.6 8.2 8.4 24.6 Instantaneous 7.9 Minimum >= 6.5 (RO) 2.0 <1 16 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Th 11/1/18 1-F 11/2/18 1-Sa 11/3/18 2-Su 11/4/18 2-M 11/5/18 2-T 11/6/18 2-W 11/7/18 2-Th 11/8/18 2-F 11/9/18 2-Sa 11/10/18 3-Su 11/11/18 3-M 11/12/18 3-T 11/13/18 3-W 11/14/18 3-Th 11/15/18 3-F 11/16/18 3-Sa 11/17/18 4-Su 11/18/18 4-M 11/19/18 4-T 11/20/18 4-W 11/21/18 4-Th 11/22/18 4-F 11/23/18 4-Sa 11/24/18 5-Su 11/25/18 5-M 11/26/18 5-T 11/27/18 5-W 11/28/18 5-Th 11/29/18 5-F 11/30/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 11/6/2018 5.2 Results reported from a grab sample taken 11/6/2018 Measured NTU CWB Copper 11/6/2018 14 Results reported from a 24-hour composite sample Total collected 11/5/2018-11/6/2018 Micrograms/L (ug/L)

CWB Chromium 11/6/2018 Bl<1 Results reported from a 24-hour composite sample Total collected 11/5/2018-11/6/2018 Micrograms/L (ug/L)

CWB Zinc 11/6/2018 16 Results reported from a 24-hour composite sample Total collected 11/5/2018-11/6/2018 Micrograms/L (ug/L)

CWB2 All Parameters Total residual halogen reported SSWD All Parameters C No discharge from the SSW ponds directly to blowdown line Outfall 001.

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: 11/01/2018 - 11/30/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Th 11/1/18 19695 1-F 11/2/18 19695 1-Sa 11/3/18 45178 2-Su 11/4/18 32566 2-M 11/5/18 19695 2-T 11/6/18 32695 2-W 11/7/18 35595 2-Th 11/8/18 44295 2-F 11/9/18 35395 2-Sa 11/10/18 35395 3-Su 11/11/18 35395 3-M 11/12/18 35395 3-T 11/13/18 35195 3-W 11/14/18 19695 3-Th 11/15/18 19695 3-F 11/16/18 35595 3-Sa 11/17/18 35595 4-Su 11/18/18 19695 4-M 11/19/18 19695 4-T 11/20/18 35539 4-W 11/21/18 19695 4-Th 11/22/18 35595 4-F 11/23/18 33795 4-Sa 11/24/18 38028 5-Su 11/25/18 32688 5-M 11/26/18 35269 5-T 11/27/18 35895 5-W 11/28/18 35495 5-Th 11/29/18 35695 5-F 11/30/18 19695 933548 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: 11/01/2018 - 11/30/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Th 11/1/18 23.2 1-F 11/2/18 22.5 1-Sa 11/3/18 22.8 2-Su 11/4/18 23.6 2-M 11/5/18 21.1 2-T 11/6/18 25.4 2-W 11/7/18 21.2 2-Th 11/8/18 23.7 2-F 11/9/18 18.7 2-Sa 11/10/18 21.9 3-Su 11/11/18 21.2 3-M 11/12/18 16.7 3-T 11/13/18 19.1 3-W 11/14/18 18.8 3-Th 11/15/18 24.1 3-F 11/16/18 19.3 3-Sa 11/17/18 18.9 4-Su 11/18/18 18.2 4-M 11/19/18 19.9 4-T 11/20/18 18.5 4-W 11/21/18 18.7 4-Th 11/22/18 19.4 4-F 11/23/18 20.4 4-Sa 11/24/18 21.6 5-Su 11/25/18 20.7 5-M 11/26/18 19.4 5-T 11/27/18 21.6 5-W 11/28/18 19.7 5-Th 11/29/18 22.1 5-F 11/30/18 20.3 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 GO2-19-009 DIC: 1316.20 DATE: January 10, 2019 TO: Columbia Generating Station, (CGS)

FROM: Jane LePage, Environmental Scientist (1025)

SUBJECT:

Columbia Generating Station DECEMBER 2018 NPDES DISCHARGE MONITORING REPORT

REFERENCE:

NPDES Permit No. WA002515-1, Condition S3.A Please find attached the NPDES Discharge Monitoring Report (DMR) for December 2018. 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 January 10, 2019 Columbia Generating Station 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 C. Barfuss, Supervisor, Environmental Services Approved by: Shannon Khounnala, Manager, E&RP

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: 12/01/2018 - 12/31/2018 Outfall: 001 Version: 1 Monitoring Week Point CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB CWB2 1-Sa 12/1/18 2.4 8.1 8.2 24.3 2-Su 12/2/18 2.4 8.0 8.2 23.5 2-M 12/3/18 0.8 8.2 8.3 0 23.4 <0.1 <0.1 2-T 12/4/18 2.4 8.2 8.4 22.0 6.6* 17* <1* 24*

2-W 12/5/18 0.6 8.2 8.3 0 21.4 <0.1 <0.1 2-Th 12/6/18 2.2 8.1 8.3 25.0 2-F 12/7/18 0.5 8.1 8.4 0 23.8 <0.1 <0.1 2-Sa 12/8/18 2.3 8.3 8.4 20.6 3-Su 12/9/18 2.3 8.1 8.5 21.3 3-M 12/10/18 2.3 8.2 8.3 22.3 3-T 12/11/18 0.4 8.3 8.3 20.9 3-W 12/12/18 1.5 8.2 8.3 0 22.9 <0.1 <0.1 3-Th 12/13/18 1.6 8.0 8.5 24.7 3-F 12/14/18 1.2 8.1 8.5 0 24.5 <0.1 <0.1 3-Sa 12/15/18 2.0 7.9 8.4 24.8 4-Su 12/16/18 2.0 7.8 8.3 22.5 4-M 12/17/18 1.2 8.2 8.4 0 24.3 <0.1 <0.1 4-T 12/18/18 2.0 8.3 8.5 26.3 4-W 12/19/18 0.7 7.9 8.4 0 25.8 <0.1 <0.1 4-Th 12/20/18 2.6 7.9 8.3 25.0 4-F 12/21/18 1.2 8.1 8.3 0 25.0 <0.1 <0.1 4-Sa 12/22/18 2.0 8.0 8.3 21.5 5-Su 12/23/18 2.0 8.0 8.4 21.1 5-M 12/24/18 1.0 8.3 8.5 0 21.0 <0.1 <0.1 5-T 12/25/18 2.1 8.2 8.5 21.5 5-W 12/26/18 1.2 8.1 8.4 0 22.5 <0.1 <0.1 5-Th 12/27/18 2.1 7.9 8.4 22.6 5-F 12/28/18 1.1 8.1 8.5 0 21.1 <0.1 <0.1 5-Sa 12/29/18 1.9 8.2 8.4 26.0 6-Su 12/30/18 1.9 8.3 8.4 26.0 6-M 12/31/18 0.4 8.2 8.4 0 22.3 <0.1 <0.1 Instantaneous 7.8 Minimum >= 6.5 (RO) 1.6 <1 24 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

Washington State Department of Ecology Discharge Monitoring Report (DMR) Page: 2 of 5 Monitoring Week Point SSWD SSWD 1-Sa 12/1/18 2-Su 12/2/18 2-M 12/3/18 2-T 12/4/18 2-W 12/5/18 2-Th 12/6/18 2-F 12/7/18 2-Sa 12/8/18 3-Su 12/9/18 3-M 12/10/18 3-T 12/11/18 3-W 12/12/18 3-Th 12/13/18 3-F 12/14/18 3-Sa 12/15/18 4-Su 12/16/18 4-M 12/17/18 4-T 12/18/18 4-W 12/19/18 4-Th 12/20/18 4-F 12/21/18 4-Sa 12/22/18 5-Su 12/23/18 5-M 12/24/18 5-T 12/25/18 5-W 12/26/18 5-Th 12/27/18 5-F 12/28/18 5-Sa 12/29/18 6-Su 12/30/18 6-M 12/31/18 Instantaneous Minimum Average Monthly Instantaneous Maximum Monthly Total

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) 12/4/2018 6.6 Results reported from a grab sample taken 12/4/2018 Measured NTU CWB Copper 12/4/2018 17 Results reported from a 24-hour composite sample Total collected 12/3/2018-12/4/2018 Micrograms/L (ug/L)

CWB Chromium 12/4/2018 Bl<1 Results reported from a 24-hour composite sample Total collected 12/3/2018-12/4/2018 Micrograms/L (ug/L)

CWB Zinc 12/4/2018 24 Results reported from a 24-hour composite sample Total collected 12/3/2018-12/4/2018 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: 12/01/2018 - 12/31/2018 Outfall: 002 Version: 1 Monitoring Week Point Pnd 1-Sa 12/1/18 36824 2-Su 12/2/18 20658 2-M 12/3/18 20658 2-T 12/4/18 20658 2-W 12/5/18 36558 2-Th 12/6/18 35858 2-F 12/7/18 36158 2-Sa 12/8/18 34195 3-Su 12/9/18 32903 3-M 12/10/18 46476 3-T 12/11/18 20658 3-W 12/12/18 33158 3-Th 12/13/18 20658 3-F 12/14/18 33458 3-Sa 12/15/18 33558 4-Su 12/16/18 32958 4-M 12/17/18 33258 4-T 12/18/18 32758 4-W 12/19/18 33458 4-Th 12/20/18 33458 4-F 12/21/18 36758 4-Sa 12/22/18 47558 5-Su 12/23/18 33658 5-M 12/24/18 34258 5-T 12/25/18 33558 5-W 12/26/18 33858 5-Th 12/27/18 20658 5-F 12/28/18 33858 5-Sa 12/29/18 20658 6-Su 12/30/18 47022 6-M 12/31/18 20658 990828 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: 12/01/2018 - 12/31/2018 Outfall: Intk - Cooling water intake structure Version: 1 Monitoring Week Point Intk 1-Sa 12/1/18 21.6 2-Su 12/2/18 21.2 2-M 12/3/18 19.0 2-T 12/4/18 20.2 2-W 12/5/18 18.7 2-Th 12/6/18 18.9 2-F 12/7/18 12.7 2-Sa 12/8/18 14.8 3-Su 12/9/18 15.3 3-M 12/10/18 15.2 3-T 12/11/18 14.0 3-W 12/12/18 19.6 3-Th 12/13/18 21.9 3-F 12/14/18 20.7 3-Sa 12/15/18 17.3 4-Su 12/16/18 17.0 4-M 12/17/18 21.3 4-T 12/18/18 22.9 4-W 12/19/18 20.2 4-Th 12/20/18 22.9 4-F 12/21/18 20.0 4-Sa 12/22/18 20.9 5-Su 12/23/18 19.5 5-M 12/24/18 19.7 5-T 12/25/18 20.1 5-W 12/26/18 19.7 5-Th 12/27/18 19.7 5-F 12/28/18 18.7 5-Sa 12/29/18 22.2 6-Su 12/30/18 21.7 6-M 12/31/18 18.4 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.

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