KingstonKingston FossilFossil Plant Plant KINGSTON,KINGSTON, TENNESSEETENNESSEE

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EPAEPA CCRCCR RULERule Groundwater GROUNDWATER Monitoring MONITORING Commissioning Date: 1955 This fact sheet summarizes groundwater monitoring conducted by Commissioning Date: 19551955 This fact sheet summarizes groundwater monitoring conducted by TVA for the Output: 1,398 Megawatts (10 Billion TVAKingston as required Fossil Plant, by asthe required U.S. Environmentalby the U.S. Environmental Protection Protection Agency Agency (EPA) Output:kilowatt-hours 1,3981,398 perMegawattsMegawatts year) (10(10 BillionBillion (EPA) CombustionCoal Combustion Residuals Residuals (CCR) (CCR) Rule.Rule. The The EPA EPA published published the CCR the Rule kilowatt-hourskilowatt-hours perper year)year) on April 17, 2015. It requires companies operating coal-fired power plants to study Number of homes powered: CCR Rule on April 17, 2015. It requires companies operating coal- NumberApproximately of homes 700,000 powered: homes whether constituents in CCR have been released to groundwater from active, fired power plants to study whether constituents in CCR have been Approximately 700,000 homes inactive and new CCR impoundments, as well as active and new CCR landfills. Wet to Dry / Dewatered releasedreleased toto groundwater.groundwater. ThisThis factfact sheetsheet addressesaddresses thethe EPAEPA CCRCCR WetConversion to Dry / Program:Dewatered Complete for RuleThe CCR groundwater Rule establishes monitoring multiple only.phases of protective groundwater monitoring Conversionfly ash, bottom Program: ash, and CompleteComplete gypsum forfor including baseline sampling, Detection Monitoring and Assessment Monitoring. flyfly ash,ash, bottombottom ash,ash, andand gypsumgypsum InInCorrective additionaddition action toto ongoingongoing may be necessary groundwatergroundwater at the monitoring monitoringcompletion of requiredrequired this process. underunder For more CCR Units Closed: 351 acres CCR Units Closed: 351351 acresacres Stateinformation regulations, on the CCR TVA Rule enhanced Groundwater the Monitoringmonitoring requirements, well network go to at the TVA Wide CCR Conversion Kingstonwww.tva.com/ccr Fossil Plant. to comply with the CCR Rule requirements. TVAProgram Wide Total CCR Spend: Conversion Approximately $1.3 Billion Additional wells were installed around the CCR management units Program Total Spend: Kingston Plant CCR Rule Groundwater Monitoring Network Approximately $1.3 Billion as needed and TVA implemented a baseline sampling program. After In addition to ongoing groundwater monitoring required under State regulations, completionTVA installed ofadditional the baseline wells around sampling, the CCR the management CCR Rule unit, requires as needed, TVA to beginand implemented monitoring a baselinegroundwater sampling in program.a step that After is completion called “Detection of the baseline Monitoring”. The constituents specified bysampling, the CCR TVA Rule began for Detection Detection Monitoring. Monitoring The constituents are boron, specified calcium, by chloride, the CCR fluoride, pH, sulfate, and total dissolvedRule for Detection solids Monitoring(TDS). These are boron, seven calcium, constituents chloride, occur fluoride, naturally pH, sulfate, in soils, rock, groundwater and surface water,and total and dissolved they are solids also (TDS). present These in seven coal constituents and in CCR. occur They naturally were in selected soils, by EPA because they can rock, groundwater and surface water, and can also be present in coal and in CCR. indicateindicate groundwatergroundwater conditionsconditions thatthat maymay requirerequire furtherfurther evaluation.evaluation. They were selected by EPA because they can indicate groundwater conditions that EPAmay requireCCR RULEfurther evaluation.GROUNDWATER MONITORING NETWORK FOR THE KINGSTON FOSSIL PLANT TVA installed “background wells” in locations that are not expected to be affected by the management of CCR. Other wells were drilled around the edge of the areas where CCR is managed or were already existing and being monitored. These wells are sometimes referred to as “downgradient wells” and placed inin locationslocations toto monitormonitor forfor releasesreleases toto groundwater.groundwater. TheThe locationslocations ofof thethe wellswells areare shownshown below.below.

TENNESSEE VALLEY AUTHORITY || FACT SHEET CCR GROUNDWATER MONITORING VALLEY VALLEY AUTHORITY AUTHORITY | FACT FACTSHEET SHEET AUGUST 13, 2019 CCRCCR GROUNDWATER GROUNDWATER MONITORING MONITORING TVA installed “background”, or upgradient, wells in locations that are not expected to be affected by the management of $¯$ CCR. Other wells were drilled around the edge of the areas wherer CCR is managed or already (existed and were being e iv monitored. These wells are sometimes referred to as “downgradient R wells” and placed in locations to monitor for releases to ry o m groundwater. The locations of the wells are shown below.E

" $¯$ r ( e iv R ry o m E

"

Intake Channel

Emory River

G-1B " !( G-10B Intake Cha!(nnel KIF-101 k c

a G-9B l

b !( !( h c

: y Peninsula Disposal Area B

9 G-8B 1 -

1 1 G-7B -

8 !( 1

0 G-3A 2

: !( G-7A d e G-3B s G-5A i !( v G-5B e !( R

d x m . s l l e " "

W G-1B t Martin Shoals n e i d !( G-10B a r g n

w !( o

D KIF-101 d k n c a

_ a G-9B l b d !( !( h n u c

Project Location 182603174 : o r IN y 0 1,000 2,000 g Peninsula Disposal Area B !( k Background Well City of Kingston Prepared by CMB on 2018-11-19

9 G-8B c

IL W1 V

- Feet a

1 Roane County, Technical Review by WSW on 2018-11-19 _ B 1 G-7B - t i

8 Tennessee !( Independent Review by JK on 2018-11-19 n KY

1 1:24,000 (At original document size of 8.5x11)

U !( 0 Downgradient Well G-3A R 2

: !( C MO Client/Project G-7A d

C VA Notes

e G-3B s w G-5A i !( _ Tennessee Valley Authority v Clinch1. CRooirvdienarte System: NAD 1983 StatePlane Tennessee FIPS 4100 FeGet-5B 1

e !( g i R CCR Unit Subject to CCR Rule 2. Imagery Source: Tucker Mapping Solutions, INC (2017-03-16) and

_ F

Kingston Fossil Plant

F

I !( Imagery Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, K d x \ TN 8 AR CCR Rule

m CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User 1

NC. s 0

l l

2 Community e Figure No. \ TVA Property Boundary " F I W t

K Martin Shoals n \ s e

i 1 d d x a r m Title g \ s

SCn i g AL w \ MS GA o 4

D Map with CCR Unit Background 7 d 1 n 3 0 6 _ a 2

d and Downgradient Wells 8 n 1 u

\ Project Location 182603174 : o

Disclaimer: Stantec assumes no responsibility for data supplied in elecr tronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. U IN 0 1,000 2,000 g !( k Background Well City of Kingston Prepared by CMB on 2018-11-19 c IL WV Feet a Roane County, Technical Review by WSW on 2018-11-19 _ B t i Tennessee Independent Review by JK on 2018-11-19 n CCR Rule Detection Monitoring Results for Kingston Fossil Plant KY 1:24,000 (At original document size of 8.5x11)

U !( Downgradient Well R

C MO Client/Project

C VA Notes w

_ 1. Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 Feet Tennessee Valley Authority 1 g i CCR Unit Subject to CCR Rule 2. Imagery Source: Tucker Mapping Solutions, INC (2017-03-16) and

_ F Kingston Fossil Plant

F TVA prepared its initial 2017 Annual Groundwater Monitoring and Corrective Action Report for the Kingston Fossil I !( Imagery Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, K

\ TN 8 AR CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User CCR Rule 1 NC 0

2 Community Figure No. \ TVA Property Boundary F I

K Plant, which analyzed the detection monitoring results to determine if there were statistically significant increases (SSIs) over \ s 1 d x

m Title \

s SC i

g AL \ backgroundMS levels.GA The report can be found by clicking on the following hyperlink www.tva.com/ccr. The initial comparison 4 Map with CCR Unit Background 7 1 3 0 6

2 and Downgradient Wells 8 1 \ : ofDiscla imdowngradienter: Stantec assumes no responsibility for data suwellspplied in electro ntoic form atupgradient. The recipient accepts full responsi bilwellsity for verifying th eshows accuracy and comp lethatteness of the dconcentrationsata. The recipient releases Stantec, its officers, em pofloyees , cboron,onsultants and agen ts,calcium, from any and all claims aris ingchloride, in any way from the conte nt fluoride,or provision of the data. pH, sulfate and U TDS around the CCR management unit may be greater than naturally occurring levels. Data does not reflect the quality of public drinking water supplies, which are regularly tested to confirm they are meeting safe drinking water standards.

2018 Groundwater Monitoring Activities Since the initial groundwater monitoring results identified SSIs, TVA conducted an alternate source demonstration to determine if the exceedances were the result of another source or the result of an error in the sampling or analytical method, or natural variability in groundwater quality. The demonstration determined the SSIs were due to sources other than the Peninsula Disposal Area CCR unit. The demonstration is contained in the 2018 Annual Groundwater Monitoring and Corrective Action Report. The report can be found at www.tva.com/ccr.

Next Steps for Kingston Fossil Plant CCR Rule Groundwater Monitoring TVA will continue detection monitoring for the Peninsula Disposal Area CCR Unit. In addition, the Kingston Plant has two CCR units that did not require detection monitoring under the original CCR Rule. However, these units are now included under the revised CCR Rule on a different schedule and the initial results of Detection Monitoring are included in the Initial Annual Groundwater Monitoring and Corrective Action Report which will be posted to the CCR website on September 3, 2019.

TENNESSEE VALLEY AUTHORITY | FACT SHEET AUGUST 13, 2019 CCR GROUNDWATER MONITORING