Tennessee Valley Authority - tva.gov Content/Environment/CCR/Sites... · • TVA is seeking input...
Transcript of Tennessee Valley Authority - tva.gov Content/Environment/CCR/Sites... · • TVA is seeking input...
Remedial Investigation
Interim Response Actions
Environmental Impact Statement
Environmental Investigation+
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+
Tennessee Valley Authority welcomes you to the
ALLEN FOSSIL PLANT COMMUNITY INFORMATION
SESSION
ALLEN FOSSIL PLANT
Closure + Development
TODAY'S TOPICS
Environmental Impact Statement• TVA is seeking input on the scope
of its evaluation for the closure of the East Ash Pond Complex, the West Ash Pond, and the Metal Cleaning Pond
• TVA is analyzing options for disposal of ash in a beneficial re-use process and in an offsite landfill
• One project purpose and need is to make land available for future economic development projects in the greater Memphis area
• Public comment period is until November 25, 2019
Environmental Investigation• Details on how TVA is investigating
and assessing the extent of impacts on soil and groundwater from management and disposal of Coal Combustion Residuals (CCR) at the Allen Fossil Plant
• Outlines the activities that will be underway at the site to better evaluate what must be done to safely manage the storage and disposal of CCR
Remedial Investigation• TDEC is directing an ongoing
groundwater remedial investigation (RI) at the Allen Fossil Plant focused on the East Ash Disposal Area
• The RI at the Allen Fossil Plant was started following the detection of elevated arsenic in groundwater near the East Ash Disposal Area
• Information on the remedial investigation and interim action for addressing the arsenic issue
Interim Response Actions• Information on the Groundwater
Remediation system which will control and treat arsenic in groundwater found in two areas north and south of the East Ash Disposal Area
• Details on how pond dewatering is being performed to remove standing water and ash pore water prior to removal of the CCR
Current Groundwater Conditions
Current Environmental Activities
Investigation + Evaluation
ALLEN FOSSIL PLANT
OVERVIEW
Facility Overview
1956 Allen Fossil Plant constructed by Memphis Light Gas & Water
1965 TVA began leasing the plant and purchased it in 1984
741 megawatts net capacity
3 Coal-fired units (closed)
2018 Ceased operations and replaced by TVA Allen Combined Cycle plant
2019 Begin dewatering East Ash Disposal Area
East Ash Pond Complex
_̂
Allen Fossil Plant
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T e n n e ssee
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November 2018Project No. 172676009
Client/Project
1Figure No.
Title
Tennessee Valley AuthorityAllen Fossil Plant Memphis, Shelby County, Tennessee
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2. Imagery provided by client (dated 2015)
Environmental Study Area
Legend
East Ash Pond Complex
970 1,940Feet
ALF NEPA Map
0 485
Construction Lay Down Area
West Ash PondMetal Cleaning
PondMetal Cleaning
Pond
TDEC Order CCR Units:
• West Ash Pond
• East Ash Pond
East Ash Pond Complex
_̂
Allen Fossil Plant
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November 2018Project No. 172676009
Client/Project
1Figure No.
Title
Tennessee Valley AuthorityAllen Fossil Plant Memphis, Shelby County, Tennessee
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1. Coordinate System: WGS 1984 Web Mercator Auxiliary Sphere
2. Imagery provided by client (dated 2015)
Environmental Study Area
Legend
East Ash Pond Complex
970 1,940Feet
ALF NEPA Map
0 485
Construction Lay Down Area
West Ash PondMetal Cleaning
PondMetal Cleaning
Pond
ALLEN FOSSIL PLANT
HISTORIC TIMELINE
1956
1965
1984
1991
2005
2018
1978
1960s
Allen Fossil Plant constructed by Memphis Light Gas & Water
TVA begins leasing the Allen Fossil Plant
TVA purchases the Allen Fossil Plant
East Ash Disposal Area temporarily deactivated to facilitate construction of USACE levee
Dredge cell and diversion trench constructed within the East Ash Disposal Area
Ceased operations and replaced by TVA Allen Combined Cycle plant
Compared with the former Allen Fossil Plant the new plant reduces carbon emissions by 60%, nitrogen oxides by 90%, and sulfur dioxide by nearly 100%
West Ash Disposal Area deactivated
North perimeter dike constructed as a flood control levee
ALLEN FOSSIL PLANT
TVA's commitment• TVA is committed to protecting human health and the environment and doing the right thing for the
people of Memphis
• TVA is committed to the remediation of arsenic impacts at the Allen Fossil Plant
• TVA is committed to economic development in Memphis
• TVA has suspended use of the groundwater production wells at the Allen Combined Cycle Natural Gas Plant and has contracted with MLGW to obtain cooling water for the plant
TVA's strategy Short-term Allen Fossil Plant CCR strategy:
• Implement groundwater Interim Response Action
• Dewater East Ash Disposal Area
• Perform supplemental Investigations
Long-term ALF CCR strategy:
• Conduct National Environmental Policy Act evaluation to determine closure alternative
• Perform groundwater remediation
• Restore site for industrial use
TVA'S COMMITMENT AND STRATEGY
Conceptual Future Redevelopment
ALLEN FOSSIL PLANT
COAL COMBUSTION RESIDUALS COMPLIANCE ORDER
What is the TDEC Order and why was it put in place?On August 6, 2015, the Tennessee Department of Environment and Conservation (TDEC) issued Commissioner’s Order No. OGC15-0177 to the Tennessee Valley Authority (TVA) for Coal Combustion Residuals (CCR) Compliance pursuant to the provisions of Tennessee’s solid waste management and disposal laws.
This order establishes a transparent, comprehensive process to investigate, assess, and remedy unacceptable risks resulting from the management and disposal of CCR at TVA coal-fired power plants within the state.
Did you know…In 2018, Allen’s three coal-fired units were retired and replaced with natural gas generators that will help ensure low-cost and reliable electricity for the greater Memphis area.
What is the EIP?What it is and why we do it TDEC has requested certain information about Allen’s CCR management.
What TVA has already done TVA has ongoing programs and monitoring that can help answer TDEC’s questions.
Proposed EIP Activities The Environmental Investigation Plan (EIP) lays out the proposed investigation TVA is conducting to provide additional information that TDEC has requested.
What are coal combustion residuals?
Coal combustion residuals, commonly known as coal ash, are created when power plants burn coal to produce electricity.
These residuals include fly ash and bottom ash/slag and are collected separately from different areas of the facility.
Fly ash originates from the flue gas electrostatic precipitators and bottom ash from the boilers.
Slag Fly Ash
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT ASH IMPOUNDMENT CLOSURE
Alternative A
• No Action
Alternative B (Preferred)
• Closure-by-Removal of the East Ash Pond Complex, West Ash Pond and Metal Cleaning Pond
• Disposal of CCR to an Offsite Landfill Location
Alternative C
• Closure-by-Removal of the East Ash Pond Complex, West Ash Pond and Metal Cleaning Pond
• Disposal of CCR in a Beneficial Re-Use Process and Offsite Landfill Location
Why it is being done• Support TVA’s commitment to eliminate
wet CCR storage at its coal plants by closing CCR surface impoundments
• Meet federal and state requirements including the U.S. Environmental Protection Agency’s CCR Rule and National Environmental Policy Act
• Make land available for future economic development projects in the greater Memphis area
Projects studied• Closure of the East Ash Pond Complex
• Re-evaluation of the West Ash Pond for Closure-by-Removal
• Closure of the Metal Cleaning Pond
• Possible Use of CCR in a Beneficial Re-use Process
• Evaluation of Existing Off-Site Permitted Landfills that will Accept CCR Materials from ALF
• Evaluation of Existing Offsite Backfill Sources
How it might get done
Alternatives Considered in the EIS
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT—PROCESS/SCHEDULE
Publication of the Notice of Intent in the Federal Register
November 30, 2018
Notify interested parties about availability of Draft EIS for comments
Complete October 4, 2019
Review public scoping comments, identify alternatives, conduct studies and develop Draft EIS
Complete Fall 2019
Revise Draft EIS based on comments from the public and agencies
Complete Late 2019
Notice of availability of Final EIS will be published
Complete Early 2020
TVA will publish a ROD after making a final determination concerning projects addressed in the EIS
Estimated Spring 2020
Public Provides input on EIS scope
November 30, 2018–January 31, 2019
45 days
Notice of Intent
Release Draft EIS
Prepare Draft EISPublic Scoping Period
Official Public Comment Period
Finalize EIS Release Final EIS Record of Decision (ROD)
Public Meetings October 8 + 30, 2019
Community Information Session January 17, 2019
Meetings provide an opportunity for public to discuss Draft EIS with Project Team and provide comments
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT—COMMENTS
How to Provide Comments on the EISWritten comments can be left here or mailed to the address on the Comment Form.
You can also provide comments by:
Email: [email protected]
Web: www.tva.gov/nepa
Mail: Attn: W. Douglas White NEPA Specialist Environmental Compliance & Operations
Tennessee Valley Authority 400 W. Summit Hill Drive Knoxville, TN 37902
All comments received by November 25, 2019 will become part of the EIS record
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT—POTENTIAL LANDFILL SITES
• Located within 600 miles for Rail - or -
• Located within 30 miles for Truck
• Existing permitted landfill
• Large commercial operator
• Ability to accept CCR
• Ability to dedicate a portion of the landfill to this project
• Serviced by an existing rail spur or port (if located more than 30 miles from Allen Fossil Plant)
• Sufficient capacity
• No geographic restrictions on waste origin that exclude Allen Fossil Plant
Landfills were screened based on the following criteria:
Facility Commercial Carrier City, State Distance to Allen Fossil Plant
Transport Method
South Shelby Landfill Republic Services Memphis, Tennessee 14 miles Truck
Tunica Landfill Waste Management Robinsonville, Mississippi 20 miles Truck
North Shelby Landfill Republic Services Millington, Tennessee 21 miles Truck
Arrowhead Landfill Green Group Holdings Uniontown, Alabama 240 miles Rail
Taylor County Disposal Landfill Waste Industries Mauk, Georgia 380 miles Rail
Lee County Landfill Republic Services Bishopville, South Carolina 565 miles Rail
Potential Landfill Locations
ALLEN FOSSIL PLANT
Criteria Truck Transport Rail Transport
Safety Minor impact due to Increased risk of accidents and road damage due to increased vehicles on roadways
Minor impact due to Increased risk of accidents and derailments
Risk would be greater than transport by truck due to increased distance traveled
Distance 30-mile radius 600-mile radius
Closure Period 8-years
Average 240 truck trips per day during closure period
15 years
100 rail cars (1 train) every 9 days during closure period
Environmental Impacts
Minor, localized air, greenhouse gas and noise emissions
Minor, localized air and noise emissions (yet less than transport by truck)
Marginally greater emissions of greenhouse gases due to longer travel distance
Transportation Impact
Moderate and localized impact to existing transportation system
Minimized with the development and implementation of a Traffic Management Plan
Minor impact to existing regional railway system
Infrastructure Improvements
Sufficient roads already exist Require upgrades to local rail system to support railcar storage and staging
ENVIRONMENTAL IMPACT STATEMENT—TRUCK VS RAIL TRANSPORT OF CCR
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT—POTENTIAL BACKFILL (BORROW) SOURCES
Potential Backfill Source Locations and Haul Routes
TVA will use clean soil to backfill the East Pond after the CCR has been removed.
TVA will implement the following measures to minimize impacts associated with the transport of backfill material (i.e., clean soil or borrow material) to Allen Fossil Plant and the offsite transport of CCR from the plant:
Measures to minimize fugitive dust and exhaust emissions
• Require all contractors to keep construction equipment properly maintained
• Require the use of Best Management Practices such as covered loads and watering unpaved haul roads
Measure to minimize noise impacts
• Minimize the use of backfill source locations that require access from lower volume roadways
Measures to minimize traffic impacts
• Develop a traffic management plan that considers
– Alternate access locations to/from Allen Fossil Plant (i.e., Plant Road vs. Riverport Road to the west)
– Staging and management of trucks entering/exiting
– Select backfill source locations that do not require use of local, low volume roads
– Potential alternate routing during train operations on Rivergate Road, and installation of temporary signals at key intersections
Potential Haul Routes
Potential Backfill Source Locations
Haul Route
Low Income Population
Minority Population
Legend
ALLEN FOSSIL PLANT
TDEC ORDER ENVIRONMENTAL INVESTIGATION PLAN
General Information
Geotechnical Civil/Mapping Activities
Hydrogeologic Environmental
• Exploratory Drilling • Coal Combustion Residuals Material Quantity
• Hydrogeologic Investigation
• CCR Material Characteristics
• Slope Stability • Groundwater Investigation
• Seepage Investigation
• Background Soil Investigation
Below are the main areas of technical focus in the EIP, divided by study area. More information on the activities within each area has been provided at the stations around the room.
The evaluation of existing site data serves as the foundation to support the additional studies planned for each focus area.
This event is to provide information about the Environmental Investigation Plan (EIP) for the decommissioned Allen Fossil Plant.
The following acronyms appear frequently on the boards:
The information boards are color-coded according to the technical focus area they cover in the EIP. For instance, if they contain general information regarding the EIP process, the information board will be color-coded in blue.
• Environmental Investigation Plan (EIP)
• Environmental Assessment Report (EAR)
• Coal Combustion Residuals (CCR)
• Tennessee Department of Environment and Conservation (TDEC)
• Tennessee Valley Authority (TVA)
• Sampling and Analysis Plan (SAP)
• Environmental Protection Agency (EPA)
• Remedial Investigation (RI)
ALLEN FOSSIL PLANT
ENVIRONMENTAL INVESTIGATION PLAN
Process/Schedule
September 24, 2018
April 27, 2016
October 15–January 31 2018 2019
Complete Summer 2021
Complete Fall/Winter 2019
Complete Fall 2020
Complete Winter 2020
Complete Summer 2021
Complete Fall 2021
TD
EC
Ord
er
EIPInvestigation Conference
All Interested Parties Meeting
Official Public Comment Period
Official Public Comment Period
Summarize + Respond to Comments +
Revise EIP + TDEC approval
Implement EIP
Environmental Assessment Report
(EAR)
Corrective Action/Risk Assessment
(CARA) Plan
TDEC Approval of Closure Method and
Associated Other Remediation
Revision Cycle Address TDEC Comments
Community Information Session November 1, 2018 and January 17, 2019
ALLEN FOSSIL PLANT
EXPLORATORY DRILLING (1 of 3)
Exploratory drilling helps us better understand what is in and under each CCR unit.
It tells us:
• What is there: material types (CCR, soil) and properties (strength, permeability, etc.)
• Where it is (material locations)
• Where the water level(s) are (material saturation)
The EIP includes an evaluation of existing geotechnical data. This includes a review of design and construction records, inspection records, field data (including 150+ borings and 70+ water level instruments), laboratory data, and engineering analyses.
Each piece of information has been evaluated to confirm that it was collected and analyzed properly in the past. This existing data are very valuable to understand the CCR unit conditions.
Slope StabilityMaterial
Quantity 3D Model
Groundwater Flow Model
CCR Material Characterization
Site Geotech InformationWhat TVA has already done
• Additional borings within the interior of the CCR units
• Install temporary wells in CCR material
• Targeted borings in specific areas along unit borders
• Laboratory testing
• Share data with hydrogeological, environmental, and civil/mapping discipline teams
EIP Activities
The field geologist/engineer will prepare boring logs to describe the recovered samples.
What are borings
Drilled holes from which to take samples of CCR and soil
What it is and why we do it
ALLEN FOSSIL PLANT
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
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Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Proposed BoringsEast Ash Disposal Area
4
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-22
Technical Review by JD on 2018-05-22
Project Location
Client/Project
Exhibit No.
Title
($$¯ Legend!P Proposed Boring
$K Proposed Temporary Well (Screened Interval)
Foundation Soil [at the base of Perimeter Dikes and CCR]
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Current Impoundment (Approximate)
Former Disposal Area (Approximate)
TVA Property Boundary (Approximate)
_̂ Allen Fossil Plant
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Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Proposed BoringsEast Ash Disposal Area
4
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-22
Technical Review by JD on 2018-05-22
Project Location
Client/Project
Exhibit No.
Title
($$¯ Legend!P Proposed Boring
$K Proposed Temporary Well (Screened Interval)
Foundation Soil [at the base of Perimeter Dikes and CCR]
!*
ClayBoring IDLab Hydraulic Conductivity (cm/s) [if completed]
%L
SiltBoring IDLab Hydraulic Conductivity (cm/s) [if completed]
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Silty Sand to Sand
Boring IDLab Hydraulic Conductivity (cm/s) [if completed]
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
TVA Property Boundary (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
Where will the drilling be done?
East Ash Disposal Area 19 Borings
3 Borings with Temporary Wells and No Rock Coring
16 Borings with No Rock Coring
What are Water Level Instruments/Piezometers?
Sensors that measure water pressures in CCR and soil
Slotted well screen
Slotted PVC well pipe that allows water to enter at a selected depth in the boring
Surface protection for top of well
EXPLORATORY DRILLING (2 of 3)
ALLEN FOSSIL PLANT
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Proposed BoringsWest Ash Disposal Area
5
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-22
Technical Review by JD on 2018-05-22
Project Location
Client/Project
Exhibit No.
Title
($$¯Legend
!P Proposed Boring
$K Proposed Temporary Well (Screened Interval)
Foundation Soil [at the base of Perimeter Dikes and CCR]
!*
Clay or Silt Boring IDLab Hydraulic Conductivity (cm/s) [if completed]
!H
Silty Sand to Sand
Boring IDLab Hydraulic Conductivity (cm/s) [if completed]
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
TVA Property Boundary (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
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!*!*
!*!H
!H
!*
!*
!*!* !*
!*
!P !P !P
!P
!P
!P
!P
!P
!P
!P
!P
!P !P
!P!P
$K
$K
STN-59
STN-63
STN-67
STN-35
STN-36
STN-39 STN-40
STN-43
STN-44
STN-45
STN-55
WAD-2
WAD-3STN-19A
STN-20
STN-23
STN-24
STN-25STN-26 STN-27
STN-28
STN-375.30E-06
STN-197.80E-06
STN-38A
STN-29
STN-30
STN-31
STN-32
STN-33
STN-34
STN-38
STN-41
STN-42
WAD-1
STN-21
STN-22
STN-33A2.50E-05
STN-22A7.80E-06
TW04SluicedAsh
TW05SluicedAsh
B17 B18 B19B20
B21
B22
B27
B26
B25
B24B23
B28 B29
B30B31
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Proposed BoringsWest Ash Disposal Area
5
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-22
Technical Review by JD on 2018-05-22
Project Location
Client/Project
Exhibit No.
Title
($$¯Legend
!P Proposed Boring
$K Proposed Temporary Well (Screened Interval)
Foundation Soil [at the base of Perimeter Dikes and CCR]
!*
Clay or Silt Boring IDLab Hydraulic Conductivity (cm/s) [if completed]
!H
Silty Sand to Sand
Boring IDLab Hydraulic Conductivity (cm/s) [if completed]
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
TVA Property Boundary (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
West Ash Disposal Area 17 Borings
2 Borings with Temporary Wells and No Rock Coring
15 Borings with No Rock Coring
EXPLORATORY DRILLING (3 of 3)
ALLEN FOSSIL PLANT
SLOPE STABILITY (1 of 3)
Example of existing slope stability analysis
Inputs: Surface and subsurface geometry/zones, engineering properties, water levels/pressures, external loads
Outputs: Factor of safety against sliding
• Compare existing models to new data from the Exploratory Drilling Sampling and Analysis Plan
– If models are representative, no changes
– If not, update models and reanalyze
• New analyses (for some units) for normal and earthquake conditions
• Compare slope stability results to acceptance criteria
EIP Activities
What it is and why we do itThese analyses tell us if the slopes of the CCR units are stable. Multiple locations around each CCR unit are checked for stability.
Normal (long-term) conditions and earthquake conditions are evaluated.
What TVA has already doneSlope stability has been analyzed many times over the years, for various conditions and at multiple units.
The existing analyses were reviewed as part of the evaluation of existing geotechnical data.
Each analysis was reviewed for adequate documentation, appropriate methods, and representative conditions.
CCR Unit Normal Earthquake
East Ash Disposal Area E E/PWest Ash Disposal Area E P
E = Existing analysis P = Proposed analysis
Existing and proposed analyses satisfy EIP requirements
Fill - Sandy Silt Core
Silt and Sandy Silt
Lean and Fat Clay
Sandy SiltHydraulic Ash
Compacted Ash
Hydraulic AshFill - Sandy Silt Shell Fill - Sandy Silt Shell
Fill - Coarse Sand
Fill - Sandy Silt ShellRiprap
PZ-13
PZ-12
Stilling PondNormal Pool Elevation: 225.7 ft
Material Type Fill - Sandy Silt Shell Fill - Sandy Silt Core Sandy SiltLean and Fat Clay Silt and Sandy Silt Hydraulic Ash Compacted Ash Fill - Coarse Sand Riprap
Tennessee Valley AuthorityAllen Fossil Plant East Ash Disposal AreaMemphis, TennesseeSection E-E'
Static Slope Stability Analysis
Factor of Safety: 1.66
Existing Geometry;Long-Term, Maximum Storage Pool Loading;Effective Stress Analysis;Drained Strengths
Sat. Unit Wt.124 pcf125 pcf125 pcf115 pcf115 pcf105 pcf123 pcf120 pcf120 pcf
Cohesion0 psf0 psf0 psf0 psf0 psf0 psf0 psf0 psf0 psf
Friction Angle31 °31 °30 °26 °28 °25 °34 °34 °38 °
Horn Lake Cutoff
Divider Dike
Wet Unit Wt.120 pcf125 pcf125 pcf110 pcf110 pcf95 pcf110 pcf115 pcf120 pcf
Eastern Perimeter DikeAsh PondNormal Pool Elevation: 229.9 ft
Note: The results of the analysis shown here are based on available subsurface information, laboratory test results and approximate soil properties.The drawing depicts approximate subsurface conditions based on historical drawings or specific borings at the time of drilling. No warranties canbe made regarding the continuity of subsurface conditions.
Project No. 172675014
PZ-12R
Distance (feet)-410 -400 -390 -380 -370 -360 -350 -340 -330 -320 -310 -300 -290 -280 -270 -260 -250 -240 -230 -220 -210 -200 -190 -180 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370
Ele
vatio
n (fe
et)
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
ALLEN FOSSIL PLANT
Existing instrumentation East Ash Disposal Area
Water level instrumentation• New instruments are added
– due to Exploratory Drilling Sampling and Analysis Plan
– due to Hydrogeological Investigation Sampling and Analysis Plan (monitoring wells)
What TVA has already doneTVA has multiple types of water level instruments on site, as well as a number of monitoring wells, to track water levels in many areas. These instruments have been installed over many years, for various purposes. About 70 water level instruments are currently installed.
SLOPE STABILITY (2 of 3)
What it is and why we do itSlope stability is influenced by water levels and pressures (among other factors).
Monitoring water levels also supports the hydrogeologic investigation and the CCR material quantity estimate (saturated vs. unsaturated material).
ALF_PZ1Clay
ALF_PZ2Clay
Fill
STN-3ALF_PZ3Clay Fill
ALF_PZ4Silt Fill
ALF_PZ5Clay andSand
ALF_PZ6Sand Fill
ALF_PZ7Silt Fill
ALF_PZ8Silt Fill
ALF_PZ9Clay
STN-10Silt Fill
ALF_PZ11Sand Fill
ALF_PZ12 ClayALF_PZ13Silt Fill
ALF_PZ14Clay Fill
ALF_B_2A_PZ5Silt
ALF_B_2A_PZ4Clay
ALF_B_2A_PZ1Sand
ALF_B_2B_PZ3Clay
ALF_E_2D_PZ3Silt
ALF_E_2E_PZ6Silt
ALF_B_2A_PZ3Sand
ALF_B_2A_PZ2Clay
ALF_B_2B_PZ2Sand
ALF_B_2B_PZ1Sand
ALF_E_2D_PZ4Clay
ALF_E_2D_PZ2SiltALF_E_2D_PZ1Sand
ALF_E_2E_PZ5Clay
ALF_E_2E_PZ4Silt
ALF_E_2E_PZ3Silt
ALF_E_2E_PZ2Sand
ALF_E_2E_PZ1Sand
ALF_PZ15Silty Sand
ALF_PZ11SSand Fill
ALF_PZ9RSandy Silt
ALF-203Sand
ALF-204Sand andClay
P-6Sand,Clay, Silt
ALF-204Sand andClay
P-5 ALF-206Sand andClay
ALF-213Sand,Clay, Silt
ALF-212Sand,Clay, Silt
ALF-202Silty Sandand Sand
ALF-201Silty Sandand Sand
ALF_PZ12R Clay and Sand
ALF-201ASand
ALF-201BSand
ALF-202ASand
ALF-202BSand
ALF-203ASand
ALF-203BSand
ALF-204ASand
ALF-204BSand
ALF-205ASand
ALF-205BSand
ALF-212ASand
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Existing InstrumentationEast Ash Disposal Area
1 - Public Meeting
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-16
Technical Review by JD on 2018-10-16
Project Location
Client/Project
Figure No.
Title
LegendExisting Piezometer Open Standpipe (Screened Interval)
Existing Piezometer Vibrating Wire (Tip Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
ALF_PZ1Clay
ALF_PZ2Clay
Fill
STN-3ALF_PZ3Clay Fill
ALF_PZ4Silt Fill
ALF_PZ5Clay andSand
ALF_PZ6Sand Fill
ALF_PZ7Silt Fill
ALF_PZ8Silt Fill
ALF_PZ9Clay
STN-10Silt Fill
ALF_PZ11Sand Fill
ALF_PZ12 ClayALF_PZ13Silt Fill
ALF_PZ14Clay Fill
ALF_B_2A_PZ5Silt
ALF_B_2A_PZ4Clay
ALF_B_2A_PZ1Sand
ALF_B_2B_PZ3Clay
ALF_E_2D_PZ3Silt
ALF_E_2E_PZ6Silt
ALF_B_2A_PZ3Sand
ALF_B_2A_PZ2Clay
ALF_B_2B_PZ2Sand
ALF_B_2B_PZ1Sand
ALF_E_2D_PZ4Clay
ALF_E_2D_PZ2SiltALF_E_2D_PZ1Sand
ALF_E_2E_PZ5Clay
ALF_E_2E_PZ4Silt
ALF_E_2E_PZ3Silt
ALF_E_2E_PZ2Sand
ALF_E_2E_PZ1Sand
ALF_PZ15Silty Sand
ALF_PZ11SSand Fill
ALF_PZ9RSandy Silt
ALF-203Sand
ALF-204Sand andClay
P-6Sand,Clay, Silt
ALF-204Sand andClay
P-5 ALF-206Sand andClay
ALF-213Sand,Clay, Silt
ALF-212Sand,Clay, Silt
ALF-202Silty Sandand Sand
ALF-201Silty Sandand Sand
ALF_PZ12R Clay and Sand
ALF-201ASand
ALF-201BSand
ALF-202ASand
ALF-202BSand
ALF-203ASand
ALF-203BSand
ALF-204ASand
ALF-204BSand
ALF-205ASand
ALF-205BSand
ALF-212ASand
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Existing InstrumentationEast Ash Disposal Area
1 - Public Meeting
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-16
Technical Review by JD on 2018-10-16
Project Location
Client/Project
Figure No.
Title
LegendExisting Piezometer Open Standpipe (Screened Interval)
Existing Piezometer Vibrating Wire (Tip Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
ALLEN FOSSIL PLANT
SLOPE STABILITY (3 of 3)
Existing instrumentation West Ash Disposal Area
ALF_PZ30_ASilt Fill
ALF_PZ30_BSand
ALF_PZ33_ASand
ALF_PZ33_BSand ALF_PZ36_A
CCRALF_PZ36_B
Silt
ALF_PZ36_CSand
ALF-207Sand and
Silt
ALF-208Sand and
Silt
ALF-209Sand
ALF-207ASand
ALF-208ASand
ALF-209ASand
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Existing InstrumentationWest Ash Disposal Area
1 - Public Meeting
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-16
Technical Review by JD on 2018-10-16
Project Location
Client/Project
Figure No.
Title
LegendExisting Piezometer Open Standpipe (Screened Interval)
Existing Piezometer Vibrating Wire (Tip Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate); Dashed
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
ALF_PZ30_ASilt Fill
ALF_PZ30_BSand
ALF_PZ33_ASand
ALF_PZ33_BSand ALF_PZ36_A
CCRALF_PZ36_B
Silt
ALF_PZ36_CSand
ALF-207Sand and
Silt
ALF-208Sand and
Silt
ALF-209Sand
ALF-207ASand
ALF-208ASand
ALF-209ASand
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Existing InstrumentationWest Ash Disposal Area
1 - Public Meeting
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-16
Technical Review by JD on 2018-10-16
Project Location
Client/Project
Figure No.
Title
LegendExisting Piezometer Open Standpipe (Screened Interval)
Existing Piezometer Vibrating Wire (Tip Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate); Dashed
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
ALLEN FOSSIL PLANT
ALLEN FOSSIL PLANT DRAFT
COAL COMBUSTION RESIDUALS MATERIAL QUANTITY
• Review existing surveys, drawing, and borings
• Develop 3-dimensional models of CCR units
• Update 3-dimensional models with new boring data and water levels
• Confirm CCR volumes
What it is and why we do itRecent surveys of the site tracked the location and quantity of coal combustion residuals (CCR) to aid overall site management.
What TVA has already done• As built drawings and records
• Aerial surveys performed for specific projects
• Historical boring logs beginning in 1958
• In 2015 TVA completed 26 soil test borings, 14 cone penetration test soundings, and 5 test pits for the East and West Ash Disposal Areas
Proposed EIP Activities
Example of a 3-dimensional model developed and used to calculate volumes
East Ash Disposal Area topographic map
West Ash Disposal Area topographic map
N
N
West Ash Disposal Area
COAL COMBUSTION RESIDUALS MATERIAL QUANTITY
• Review existing surveys, drawing, and borings
• Develop 3-dimensional models of CCR units
• Update 3-dimensional models with new boring data and water levels
• Confirm CCR volumes
What it is and why we do itRecent surveys of the site tracked the location and quantity of coal combustion residuals (CCR) to aid overall site management.
What TVA has already done• As built drawings and records
• Aerial surveys performed for specific projects
• Historical boring logs beginning in 1958
• In 2015 TVA completed 26 soil test borings, 14 cone penetration test soundings, and 5 test pits for the East and West Ash Disposal Areas
EIP Activities
Example of a 3-dimensional model developed and used to calculate volumes
East Ash Disposal Area topographic map
West Ash Disposal Area topographic map
East Ash Disposal Area East Ash Disposal Area
N
N
ALLEN FOSSIL PLANT
HYDROGEOLOGIC INVESTIGATION
What it is and why we do itHydrogeologic investigations help us better understand how groundwater moves in a particular area, as well as its interaction with the surrounding soils and rocks.
These investigations consist of installing groundwater monitoring wells to collect information about groundwater.
Background and downgradient wells are used to study water quality changes.
What TVA has already done• Existing network of 66 groundwater
monitoring wells
• Wells are screened at shallow, intermediate and deep intervals
• In 2019, installed 8 new groundwater monitoring wells near West Ash Disposal Area and 1 new background monitoring well
What is a groundwater monitoring well? A well specially designed and installed to obtain representative groundwater quality samples and hydrogeologic information.
Groundwater monitoring well
ALLEN FOSSIL PLANT
What it is and why we do itGroundwater samples are collected frequently to test for a number of quality measures. By testing groundwater regularly, TVA can track compliance with regulatory permits and requirements.
• Bimonthly groundwater sampling for 1 year (6 events)
• Collect groundwater samples from 16 groundwater monitoring wells
EIP Activities
Groundwater well locations West Ash Disposal Area
What TVA has already done• Groundwater monitoring has been performed
routinely since 1988
• Samples are analyzed for CCR related constituents
GROUNDWATER INVESTIGATION
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
West AshDisposal Area
ALF-209B
ALF-208B
ALF-207B
ALF-219ALF-219BALF-219A
ALF-218ALF-218BALF-218A
ALF-210BALF-210
ALF-209ALF-209A
ALF-208ALF-208A ALF-207
ALF-207A
ALF-210A
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)Existing Monitoring Wells is referenced from TVA Drawing 10W858-03Allen Fossil Plant Reservation.
1:2,000 (At original document size of 22x34)
0 200 400 600 800Feet
Proposed West Ash Disposal Area Monitoring Wells
9
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-01
Technical Review by LP on 2018-10-01
Project Location
Client/Project
Figure No.
Title
LegendExisting Groundwater Monitoring Well
Groundwater Monitoring Well – 2019
Gauging Station
Approximate Levee Centerline
Approximate Extent of Levee
Approximate Extent of Culvert (26 Inch Wide)
TVA Property Boundary
West Ash Disposal Area
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
West AshDisposal Area
ALF-209B
ALF-208B
ALF-207B
ALF-219ALF-219BALF-219A
ALF-218ALF-218BALF-218A
ALF-210BALF-210
ALF-209ALF-209A
ALF-208ALF-208A ALF-207
ALF-207A
ALF-210A
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)Existing Monitoring Wells is referenced from TVA Drawing 10W858-03Allen Fossil Plant Reservation.
1:2,000 (At original document size of 22x34)
0 200 400 600 800Feet
Proposed West Ash Disposal Area Monitoring Wells
9
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-01
Technical Review by LP on 2018-10-01
Project Location
Client/Project
Figure No.
Title
LegendExisting Groundwater Monitoring Well
Groundwater Monitoring Well – 2019
Gauging Station
Approximate Levee Centerline
Approximate Extent of Levee
Approximate Extent of Culvert (26 Inch Wide)
TVA Property Boundary
West Ash Disposal Area
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
West AshDisposal Area
ALF-209B
ALF-208B
ALF-207B
ALF-219ALF-219BALF-219A
ALF-218ALF-218BALF-218A
ALF-210BALF-210
ALF-209ALF-209A
ALF-208ALF-208A ALF-207
ALF-207A
ALF-210A
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)Existing Monitoring Wells is referenced from TVA Drawing 10W858-03Allen Fossil Plant Reservation.
1:2,000 (At original document size of 22x34)
0 200 400 600 800Feet
Proposed West Ash Disposal Area Monitoring Wells
9
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-01
Technical Review by LP on 2018-10-01
Project Location
Client/Project
Figure No.
Title
LegendExisting Groundwater Monitoring Well
Groundwater Monitoring Well – 2019
Gauging Station
Approximate Levee Centerline
Approximate Extent of Levee
Approximate Extent of Culvert (26 Inch Wide)
TVA Property Boundary
West Ash Disposal Area
Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
West AshDisposal Area
ALF-209B
ALF-208B
ALF-207B
ALF-219ALF-219BALF-219A
ALF-218ALF-218BALF-218A
ALF-210BALF-210
ALF-209ALF-209A
ALF-208ALF-208A ALF-207
ALF-207A
ALF-210A
U:\T
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-EIP
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)Existing Monitoring Wells is referenced from TVA Drawing 10W858-03Allen Fossil Plant Reservation.
1:2,000 (At original document size of 22x34)
0 200 400 600 800Feet
Proposed West Ash Disposal Area Monitoring Wells
9
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-10-01
Technical Review by LP on 2018-10-01
Project Location
Client/Project
Figure No.
Title
LegendExisting Groundwater Monitoring Well
Groundwater Monitoring Well – 2019
Gauging Station
Approximate Levee Centerline
Approximate Extent of Levee
Approximate Extent of Culvert (26 Inch Wide)
TVA Property Boundary
West Ash Disposal Area
ALLEN FOSSIL PLANT
BACKGROUND SOIL INVESTIGATION
What it is and why we do itThe constituents found in CCR are also found in nature. This investigation would detect CCR constituent levels in background soils.
These levels can be compared to other soils to determine if they are higher than natural levels and used to determine if CCR constituents are naturally occurring in native soils.
Proposed soil sampling locations
_̂Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
"J
"J
"J
"J
"J
"J!(
&?
&?
&?
&?
&?!H
!H
!H
!H !H
!H
!H
!H
!H
!H!H
!H!H
ALF-210B
ALF-204
ALF-205
ALF-210
ALF-202
ALF-201
ALF-210A
ALF-BG-01 ALF-BG-02
ALF-BG-03
ALF-BG-04
ALF-BG-05
ALF-BG-06
ALF-BG-07ALF-BG-08
ALF-BG-09 ALF-BG-10
ALF-BG-11
ALF-BG-12
ALF-BG-13
ALF-215
ALF-214
ALF-216
ALF-201
ALF-210
Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TVA (2018 & 2015)TVA property boundary is referenced from TVA Drawing 421 P 504 AllenFossil Plant Reservation.
1:6,000 (At original document size of 22x34)
0 500 1,000 1,500 2,000Feet
Background Sampling Locations
FIGURE 5-1
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2019-02-22
Technical Review by TM on 2019-02-22
Project Location
Client/Project
Title
($$¯
Legend!H Proposed Background Soil Sampling Location - Offsite
!H Proposed Background Soil Sampling Location - TVA Property
&? 2017 Remedial Investigation Background Soil Sampling Location
"J Existing Background Groundwater Monitoring Well
"J Existing Downgradient Monitoring Well
!( Proposed Bachground Monitoring Well
TVA Property Boundary
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
"J
"J
"J
"J
"J
"J!(
&?
&?
&?
&?
&?!H
!H
!H
!H !H
!H
!H
!H
!H
!H!H
!H!H
ALF-210B
ALF-204
ALF-205
ALF-210
ALF-202
ALF-201
ALF-210A
ALF-BG-01 ALF-BG-02
ALF-BG-03
ALF-BG-04
ALF-BG-05
ALF-BG-06
ALF-BG-07ALF-BG-08
ALF-BG-09 ALF-BG-10
ALF-BG-11
ALF-BG-12
ALF-BG-13
ALF-215
ALF-214
ALF-216
ALF-201
ALF-210
Disclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TVA (2018 & 2015)TVA property boundary is referenced from TVA Drawing 421 P 504 AllenFossil Plant Reservation.
1:6,000 (At original document size of 22x34)
0 500 1,000 1,500 2,000Feet
Background Sampling Locations
FIGURE 5-1
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2019-02-22
Technical Review by TM on 2019-02-22
Project Location
Client/Project
Title
($$¯
Legend!H Proposed Background Soil Sampling Location - Offsite
!H Proposed Background Soil Sampling Location - TVA Property
&? 2017 Remedial Investigation Background Soil Sampling Location
"J Existing Background Groundwater Monitoring Well
"J Existing Downgradient Monitoring Well
!( Proposed Bachground Monitoring Well
TVA Property Boundary
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
"J
"J
"J
"J
"J
"J!(
&?
&?
&?
&?
&?!H
!H
!H
!H !H
!H
!H
!H
!H
!H!H
!H!H
ALF-210B
ALF-204
ALF-205
ALF-210
ALF-202
ALF-201
ALF-210A
ALF-BG-01 ALF-BG-02
ALF-BG-03
ALF-BG-04
ALF-BG-05
ALF-BG-06
ALF-BG-07ALF-BG-08
ALF-BG-09 ALF-BG-10
ALF-BG-11
ALF-BG-12
ALF-BG-13
ALF-215
ALF-214
ALF-216
ALF-201
ALF-210
Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.3.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TVA (2018 & 2015)TVA property boundary is referenced from TVA Drawing 421 P 504 AllenFossil Plant Reservation.
1:6,000 (At original document size of 22x34)
0 500 1,000 1,500 2,000Feet
Background Sampling Locations
FIGURE 5-1
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2019-02-22
Technical Review by TM on 2019-02-22
Project Location
Client/Project
Title
($$¯
Legend!H Proposed Background Soil Sampling Location - Offsite
!H Proposed Background Soil Sampling Location - TVA Property
&? 2017 Remedial Investigation Background Soil Sampling Location
"J Existing Background Groundwater Monitoring Well
"J Existing Downgradient Monitoring Well
!( Proposed Bachground Monitoring Well
TVA Property Boundary
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
What TVA has already done• Background soil samples were collected
from 4 locations during the Remedial Investigation in 2017
• Background soil samples were collected from 10 locations for analysis of CCR constituents in 2019
Background Soil Sampling Location - Offsite
Background Soil Sampling Location - TVA Property
Background Monitoring Well
ALLEN FOSSIL PLANT
SEEPAGE INVESTIGATION
What it is and why we do itDikes on the property are checked frequently to identify active seeps.
The soils and water at active seep areas are tested for CCR constituent levels.
Historic seep locations
• Conduct seepage investigation to identify active seeps
• Collect soil and water samples at identified seeps
• Analyze samples for CCR constituents
• Comparative analysis against background soils
• Report the analytical results in the Environmental Assessment Report (EAR)
EIP Activities
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
!(
!(
!(
!(
!( !( Seep No. 1
Seep No. 2
Seep No. 3
Seep No. 4
Seep No. 5
Seep No. 6
U:\T
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:3,600 (At original document size of 22x34)
0 300 600 900 1,200Feet
Historical Seeps (Approximate Location)
8
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-21
Technical Review by TM on 2018-05-21
Project Location
Client/Project
Exhibit No.
Title
($ $¯Legend
!( Historical Seeps (Approximate Location)
!( Inactive Seep (Approximate Location)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
Seep No. Northing Easting Approx. Size Field Notes and Status1 294801.59255 732225.28610 5' to 15' in length No flow; inactive; currently monitored2 296219.09365 729287.61382 50' x 50' Mitigated w/ graded filter3 296498.59604 726116.33309 20' x 20' No flow; inactive; mitigated - sod placement4 296105.30024 729466.32180 25' x 20' Currently monitored
5 294922.68974 728939.86058 5' x 450' in lengthFlow directed to East Ash Pond, and subject to
NPDES discharge permit
6 294903.00770 729104.89995 5' x 10'Flow directed to East Ash Pond, and subject to
NPDES discharge permit
East Ash Disposal Area
West Ash Disposal Area
What TVA has already done• TVA has conducted annual dike inspections at
ALF since 1970
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
!(
!(
!(
!(
!( !( Seep No. 1
Seep No. 2
Seep No. 3
Seep No. 4
Seep No. 5
Seep No. 6
U:\T
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:3,600 (At original document size of 22x34)
0 300 600 900 1,200Feet
Historical Seeps (Approximate Location)
8
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-05-21
Technical Review by TM on 2018-05-21
Project Location
Client/Project
Exhibit No.
Title
($ $¯Legend
!( Historical Seeps (Approximate Location)
!( Inactive Seep (Approximate Location)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
Seep No. Northing Easting Approx. Size Field Notes and Status1 294801.59255 732225.28610 5' to 15' in length No flow; inactive; currently monitored2 296219.09365 729287.61382 50' x 50' Mitigated w/ graded filter3 296498.59604 726116.33309 20' x 20' No flow; inactive; mitigated - sod placement4 296105.30024 729466.32180 25' x 20' Currently monitored
5 294922.68974 728939.86058 5' x 450' in lengthFlow directed to East Ash Pond, and subject to
NPDES discharge permit
6 294903.00770 729104.89995 5' x 10'Flow directed to East Ash Pond, and subject to
NPDES discharge permit
East Ash Disposal Area
West Ash Disposal Area
ALLEN FOSSIL PLANT
COAL COMBUSTION RESIDUALS MATERIAL CHARACTERISTICS (1 of 2)
What it is and why we do itThe different CCR materials on site are tested for levels and types of chemical constituents. This helps us understand whether they leach from (or leave) the ash and enter the water in the CCR units.
Proposed temporary wells East Ash Disposal Area
• Collect CCR material samples from borings in units
• Collect pore water samples from temporary wells in units
• Analyze samples for CCR constituents
• Comparative analysis against existing data
• Report the analytical results in the Environmental Assessment Report (EAR)
EIP Activities
$K$K
$K
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Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Temporary WellsEast Ash Disposal Area
5
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-09-27
Technical Review by JD on 2018-09-27
Project Location
Client/Project
Figure No.
Title
($$¯
Legend$K Proposed Temporary Well (Screened Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
$K$K
$K
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TW02SluicedAsh
TW03SluicedAsh
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Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016) & TVA (2015)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Temporary WellsEast Ash Disposal Area
5
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-09-27
Technical Review by JD on 2018-09-27
Project Location
Client/Project
Figure No.
Title
($$¯
Legend$K Proposed Temporary Well (Screened Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
What TVA has already done• 1995 — Slag fines analyzed for leachability and
trace metals
• 2002 — Slag fines and fly ash analyzed for leachability and total metals; slag analyzed for leachability
• 2013 — Slag, slag fines and fly ash analyzed for leachability and total metals
• 2017 — Ash and pore water samples collected from 21 locations within the East Ash Disposal Area
ALLEN FOSSIL PLANT
COAL COMBUSTION RESIDUALS MATERIAL CHARACTERISTICS (2 of 2)
Proposed temporary wells West Ash Disposal Area
$K
$KTW04SluicedAsh
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. Page 01 of 01
Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Temporary WellsWest Ash Disposal Area
4
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-09-27
Technical Review by JD on 2018-09-27
Project Location
Client/Project
Figure No.
Title
($$¯
Legend$K Proposed Temporary Well (Screened Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
$K
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Notes
1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by Terraserver (2016)
1:1,800 (At original document size of 22x34)
0 150 300 450 600Feet
Temporary WellsWest Ash Disposal Area
4
Tennessee Valley AuthorityAllen Fossil Plant
175567295Memphis, Tennessee Prepared by TR on 2018-09-27
Technical Review by JD on 2018-09-27
Project Location
Client/Project
Figure No.
Title
($$¯
Legend$K Proposed Temporary Well (Screened Interval)
Current Impoundment (Approximate)
Former Disposal Area (Approximate)
_̂ Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
ALLEN FOSSIL PLANT
TVA'S ADVANCED TECHNOLOGY FOR IMPOUNDMENT MONITORING CENTER
TVA’s Advanced Technology for Impoundment Monitoring (ATIM) Center
$2 million to develop the ATIM center
helps to identify and respond to any coal ash issues before they become an emergency
More than 11,000 real‑time sensors to monitor ash impoundments send data (24/7/365) to a centralized computer monitoring system
LED wall displays Geographic Information System (GIS) maps, weather, earthquakes, sensor data
Operations has real‑time data or can watch what’s happening at TVA impoundments via live video
System sends alerts on any irregularities
Only facility of its kind in the utility industry in the U.S.
ATIM Center
Automated Instrumentation
ALLEN FOSSIL PLANT
Remedial investigation objectives:
• Evaluate sources
• Delineate CCR constituents in groundwater, focusing on arsenic, fluoride, and lead
• Evaluate Alluvial aquifer
• Evaluate connections between aquifers
What is Remedial Investigation?A Remedial Investigation (RI) is a scientific study intended to:
1 Gather the data necessary to evaluate the nature and extent of environmental impacts at a property
2 Establish cleanup goals
3 Identify preliminary corrective actions
Remedial investigation work performed:
• 46 wells added during the RI (for a total of 66 wells)
• 7 groundwater events
• 315 samples analyzed
• Deep stratigraphic borings were drilled to characterize the upper Claiborne confining unit (clay)
• Pumping test by United States Geological Survey (USGS)
East Ash Disposal Area
Groundwater monitoring well
REMEDIAL INVESTIGATION
A RI is performed to collect data to characterize environmental conditions that may have been affected by site operations. The RI at the Allen Fossil Plant was performed following the detection of elevated arsenic in groundwater near the East Ash Disposal Area. The RI is being performed in coordination with the TDEC Division of Remediation, and concurrently with the TDEC Order, but is focused on the groundwater near the East Ash Disposal Area.
ALLEN FOSSIL PLANT
REMEDIAL INVESTIGATION TIMELINE
Process/Schedule
May 2017
TVA Begins Voluntary Groundwater Investigation
July 2017
TDEC Requests Remedial Investigation
Work Plan
September 2017
TDEC Approves Remedial Investigation
Work Plan
November 2017
Remedial Investigation Completed
March 2018
Remedial Investigation Report Submitted to TDEC
August 2018
Supplemental Remedial Investigation Work Plan
Submitted to TDEC
May 2019
Updated Remedial Investigation Report Submitted to TDEC
December 2018
Supplemental Remedial Investigation Completed
Continued Groundwater Monitoring and Reporting
ALLEN FOSSIL PLANT
REMEDIAL INVESTIGATION— DELINEATE CCR CONSTITUENTS (1 of 2)
The horizontal extent of arsenic, fluoride, and lead in groundwater is limited to two primary areas: north and south of East Ash Disposal Area.
ALF-203
Arsenic (>10 ug/L)
ALF-202
1,800 – 4,070 ug/L
246 – 282 ug/L
ALF-203
ALF-202Fluoride
(> 4 mg/L)
Lead (> 15 ug/L)
Horizontal delineation (arsenic) north and south areas
Horizontal delineation (fluoride and lead) north and south areas
• Arsenic above the USEPA drinking water standard was found north and south of the East Ash Disposal Area in the shallow Alluvial aquifer
• The highest concentrations were found within the upper 40 feet
• Fluoride and Lead above the USEPA drinking water standards are located within the arsenic areas
ALLEN FOSSIL PLANT
Vertical distribution of arsenic, fluoride, and lead in groundwater• The highest concentrations were detected within the upper 40 feet of the Alluvial aquifer
• Arsenic, fluoride and lead were not detected above USEPA drinking water standards in any deep wells
• The Memphis aquifer (sand) has not been affected and sample results meet USEPA drinking water standards
Arsenic (>10 ug/L)
Fluoride (>4 mg/L)
Lead (>15 ug/L)
Vertical Delineation - North Area2. Delineate As,
F and Pb ingroundwater
Highest concentrations upper 40 feet
Arsenic (>10 ug/L)
Fluoride (>4 mg/L)
Vertical Delineation – South Area2. Delineate As,
F and Pb ingroundwater
No Lead (>15 ug/L) Highest concentrations upper 40 feet
REMEDIAL INVESTIGATION— DELINEATE CCR CONSTITUENTS (2 of 2)
Cross section–north of East Ash Disposal Area
Cross section–south of East Ash Disposal Area
Conceptual Cross Section—geological formation thicknesses are approximate
Conceptual Cross Section—geological formation thicknesses are approximate
ALLEN FOSSIL PLANT
PLANT DECONSTRUCTION
The Allen Fossil Plant was constructed in the 1950s by the Memphis Light, Gas and Water Company (MLGW). TVA purchased the plant and property in 1984. Allen’s three coal-fired units were retired on March 31, 2018.
On October 4, 2019, TVA issued a Final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) for decontamination and deconstruction of its Allen Fossil Plant.
The EA evaluated the potential environmental effects of the future disposition of the physical structures associated with the retired coal-fired plant units, including the powerhouse, coal handling facilities, and surrounding support buildings.
The Former Allen Fossil Plant will be Deconstructed.
TVA’s preferred alternative is Full Demolition of the Allen Plant resulting in a usable property.
This is a key step in the process to make the Allen site available for future redevelopment.
Decommissioning is already underway and deconstruction will start in 2022.
ALLEN FOSSIL PLANT
DECONSTRUCTION OF FORMER ALLEN FOSSIL PLANT
A change is underway at TVA as energy efficiency has reduced demand and the company shifts away from coal and toward cleaner sources of generation such as nuclear, renewables, and natural gas.
Old facilities are being turned into new opportunities in the most environmentally sustainable way. D4 is how most everything is reused and/or recycled, and sites are returned to grassy fields.
Decommissioning Prepare Site
• Drain oils, fuels, and solvents
• Salvage usable equipment
• Remove residual ash & coal dust from boilers and plant structures, ducts, hoppers, & bunkers
Deactivation Remove Energy Sources
• Reroute power and services
• Makie the plant “cold, dark and dry” by de-energizing, isolating, and air-gapping equipment so that it is safe to decontaminate and demolish
Decontamination Remove Regulated Materials
• Universal waste disposal
• Asbestos abatement of all structures to be demolished
Remove Plant and Structures Demolition
• Carefully deconstruct buildings and structures
• Dispose, reuse, and recycle building components and materials
• Restore the disturbed area to provide conditions suitable for redevelopment
ALLEN FOSSIL PLANT
D4—SCOPE AND TIMELINE
Allen Fossil D4 Scope and Timeline
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
TVA begins Decommissioning
2018
TVA begins Decontamination and Demolition
2022
ALLEN FOSSIL PLANT
PLANT UPDATE
Allen Fossil Plant UpdateOctober 8, 2019
Allen Fossil Plant
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 2
Commissioning Date:1959Retirement Date:March 2018Size of facility:Approx. 500 acresFormer Output:741 megawattsAmount of CCR material:Approx. 3.5 million cubic yardsCCR Units to be Closed:East Ash Pond ~100 acresWest Ash Pond ~20 acres
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
1948-1950
McKellar Lake created by City of
Memphis
McKellar Lake
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
1956-59
ALF constructed and operated by
MLGW
West Ash Pond
Allen Fossil Plant (ALF)
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
North Perimeter Dike constructed to
control flooding
1958-60
USACE Levee
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
TVA begins leasing ALF from MLGW
1965
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
Ash is sluiced to newly constructed
East Ash Pond
1969
East Ash Pond
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
West Ash Pond is deactivated
1978
West Ash Pond
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
1984
TVA Purchases the Allen Fossil Plant
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
2014
Begin Evaluation of Closure Options for East and West Ponds
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
2015
West Ash Pond
Prior to the effective date of the CCR Rule, the West Ash Pond was retrofitted to not
allow stormwater accumulation
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
2015
TVA entered into an agreement with the City
of Memphis, Shelby County, Port Authority
and MLG&W
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
TVA begins TDEC Order Activities
2017
PLANT UPDATE
ALLEN FOSSIL PLANT
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
Allen Fossil Plant ceased operations and
is replaced by Allen Combined Cycle Plant
2018
Allen Combined Cycle Plant• $975 million natural gas plant• Reduced emissions• Over 1,100 megawatts• Solar farm onsite• Equipped to use biogas from
wastewater treatment
Allen Environmental Stewardship
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
2018
CCR Sluicing to the East Ash Pond ceases
PLANT UPDATE
ALLEN FOSSIL PLANT
1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 3
TVA begins Decommissioning
2018
TVA begins Decontamination and Demolition
2022
Allen Environmental Stewardship
PLANT UPDATE
Conceptual Future Condition
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 9
East Ash Pond: Closure-by Removal
West Ash Pond: Closure-by Removal
ALF Plant: Deconstructed
ALLEN FOSSIL PLANT
For More InformationAllen Fossil Planthttps://www.tva.gov/Energy/Our-Power-System/Coal/Allen-Fossil-Plant
Air Quality – Water Quality – Ash Storagehttps://www.tva.com/Environment/Environmental-Stewardship
TDEC Orderhttps://www.tva.com/tdec
Groundwater Monitoring www.tva.com/ccr
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 10
PLANT UPDATE
West Ash Pond• Groundwater Study
– 18 Monitoring Wells– One year of
sampling planned• Background Soil
Study
TDEC Order Environmental Investigation
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
ALLEN FOSSIL PLANT
East Ash Pond• 27 new wells• 22 soil borings with 60
groundwater samplescollected
• 59 pore water samplescollected
• Deep soil borings• USGS pumping test
Remedial Investigation
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
PLANT UPDATE
East Ash Pond• Two areas of groundwater
identified with elevatedArsenic
• Impacts are limited toupper 40 feet of theAlluvial aquifer
• No impacts to theMemphis Sand Aquifer
Remedial Investigation
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
ALLEN FOSSIL PLANT
• CCR is removed for offsite disposalor beneficial reuse
• 7 to 10 years
Pond Closure: CCR Removal
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
• Backfill with clean soil, coversurface, and prepare for site re-useand development
• Continue to monitor groundwaterquality
Pond Closure: Site Restoration
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
PLANT UPDATE
ALLEN FOSSIL PLANT
<blank page>
ALLEN FOSSIL PLANT
PLANT UPDATE
• Groundwater extraction• 360 gallons per minute• Treated water is tested and
discharged to the City’s sanitary sewer for further treatment
Interim Response Action: Groundwater
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
ALLEN FOSSIL PLANT
PLANT UPDATE
• Free water and pore water are removed and treated
• Discharged to Outfall 002
Pond Closure: Dewatering
ALLEN FOSSIL PLANT UPDATE - 10-08-19 | 5
To Outfall 002
99.999% RELIABILITY
18 YEARS IN A ROW
28,000 JOBS$3.6 BILLIONIN MEMPHIS SINCE 2012
TVA ECONOMIC DEVELOPMENTHELPED CREATE
$800 MILLIONANNUAL OPERATINGCOST REDUCTION
$1 BILLIONANNUAL FUEL
COST REDUCTION
MLGWWHOLESALE RATES
FLAT, STABLE AND LOW
ALLEN COMBINED CYCLE PLANTHOME TO
LARGEST TVA OWNEDSOLAR FACILITY
* since 2005 levels
ADDED
41 MEGAWATTSOF NEW LOAD AND
22 MEGAWATTSOF PROJECTED LOAD GROWTHIN PARTNERSHIP WITH MLGW
MORE THAN60% CARBONREDUCTION
Memphis is important to TVA. We have been honored to partner with Memphis and MLGW for more than 85 years. We invest over $70 Million each year in the Memphis community, including $17 Million in tax equivalent payments. We also own and operate our $1 Billion Allen Combined Cycle plant, one of the most advanced and efficient gas generating facilities in the U.S. The plant ensures high reliability, low cost and cleaner air.
As a customer of TVA, MLGW receives the full benefits of a low-cost public power system with 99.999% reliability. TVA’s public power model allows us to partner with the customers we serve and make investments into their communities. To learn more, visit tva.com/Memphis.
Serving the people of Memphisto make life better
tva.com/Memphis | facebook.com/TVA | @TVAnews | @TVA
99.999% RELIABILITY
18 YEARS IN A ROW
28,000 JOBS$3.6 BILLIONIN MEMPHIS SINCE 2012
TVA ECONOMIC DEVELOPMENTHELPED CREATE
$800 MILLIONANNUAL OPERATINGCOST REDUCTION
$1 BILLIONANNUAL FUEL
COST REDUCTION
MLGWWHOLESALE RATES
FLAT, STABLE AND LOW
ALLEN COMBINED CYCLE PLANTHOME TO
LARGEST TVA OWNEDSOLAR FACILITY
* since 2005 levels
ADDED
41 MEGAWATTSOF NEW LOAD AND
22 MEGAWATTSOF PROJECTED LOAD GROWTHIN PARTNERSHIP WITH MLGW
MORE THAN60% CARBONREDUCTION
Memphis is important to TVA. We have been honored to partner with Memphis and MLGW for more than 85 years. We invest over $70 Million each year in the Memphis community, including $17 Million in tax equivalent payments. We also own and operate our $1 Billion Allen Combined Cycle plant, one of the most advanced and efficient gas generating facilities in the U.S. The plant ensures high reliability, low cost and cleaner air.
As a customer of TVA, MLGW receives the full benefits of a low-cost public power system with 99.999% reliability. TVA’s public power model allows us to partner with the customers we serve and make investments into their communities. To learn more, visit tva.com/Memphis.
Serving the people of Memphisto make life better
tva.com/Memphis | facebook.com/TVA | @TVAnews | @TVA
99.999% RELIABILITY
18 YEARS IN A ROW
28,000 JOBS$3.6 BILLIONIN MEMPHIS SINCE 2012
TVA ECONOMIC DEVELOPMENTHELPED CREATE
$800 MILLIONANNUAL OPERATINGCOST REDUCTION
$1 BILLIONANNUAL FUEL
COST REDUCTION
MLGWWHOLESALE RATES
FLAT, STABLE AND LOW
ALLEN COMBINED CYCLE PLANTHOME TO
LARGEST TVA OWNEDSOLAR FACILITY
* since 2005 levels
ADDED
41 MEGAWATTSOF NEW LOAD AND
22 MEGAWATTSOF PROJECTED LOAD GROWTHIN PARTNERSHIP WITH MLGW
MORE THAN60% CARBONREDUCTION
Memphis is important to TVA. We have been honored to partner with Memphis and MLGW for more than 85 years. We invest over $70 Million each year in the Memphis community, including $17 Million in tax equivalent payments. We also own and operate our $1 Billion Allen Combined Cycle plant, one of the most advanced and efficient gas generating facilities in the U.S. The plant ensures high reliability, low cost and cleaner air.
As a customer of TVA, MLGW receives the full benefits of a low-cost public power system with 99.999% reliability. TVA’s public power model allows us to partner with the customers we serve and make investments into their communities. To learn more, visit tva.com/Memphis.
Serving the people of Memphisto make life better
tva.com/Memphis | facebook.com/TVA | @TVAnews | @TVA
99.999% RELIABILITY
18 YEARS IN A ROW
28,000 JOBS$3.6 BILLIONIN MEMPHIS SINCE 2012
TVA ECONOMIC DEVELOPMENTHELPED CREATE
$800 MILLIONANNUAL OPERATINGCOST REDUCTION
$1 BILLIONANNUAL FUEL
COST REDUCTION
MLGWWHOLESALE RATES
FLAT, STABLE AND LOW
ALLEN COMBINED CYCLE PLANTHOME TO
LARGEST TVA OWNEDSOLAR FACILITY
* since 2005 levels
ADDED
41 MEGAWATTSOF NEW LOAD AND
22 MEGAWATTSOF PROJECTED LOAD GROWTHIN PARTNERSHIP WITH MLGW
MORE THAN60% CARBONREDUCTION
Memphis is important to TVA. We have been honored to partner with Memphis and MLGW for more than 85 years. We invest over $70 Million each year in the Memphis community, including $17 Million in tax equivalent payments. We also own and operate our $1 Billion Allen Combined Cycle plant, one of the most advanced and efficient gas generating facilities in the U.S. The plant ensures high reliability, low cost and cleaner air.
As a customer of TVA, MLGW receives the full benefits of a low-cost public power system with 99.999% reliability. TVA’s public power model allows us to partner with the customers we serve and make investments into their communities. To learn more, visit tva.com/Memphis.
Serving the people of Memphisto make life better
tva.com/Memphis | facebook.com/TVA | @TVAnews | @TVA
ALLEN FOSSIL PLANT
INTERIM RESPONSE ACTION: GROUNDWATER TREATMENT PROCESS
Equalization Tank
North and South Well
Fields
Flocculation Tank
Post-Clarification
Reaction Tank
FeCl Acid Base
Filter Cake
Polymer
Offsite Disposal
T.E. Maxson Wastewater Treatment
Plant
Press
GROUNDWATER INTERIM RESPONSE ACTION - TREATMENT PROCESSAllen Fossil Plant
Multi-Media Filters
Bag Filter
Groundwater is pumped from extraction wells.
Groundwater is mixed to achieve a homogeneous blend prior to treatment.
Water pH is adjusted to neutral and ferric chloride is added to bind with arsenic and facilitate particle settling.
Polymer is added to create larger particles from smaller particles of iron salts and arsenic.
Larger particles settle out, forming a sludge. Water goes to the Post-Clarification Tank.
Sludge thickens by settling over time.
Thickened sludge is pressed and dewatered to form a solid filter cake.
Prior to filtration, water pH is adjusted to meet discharge requirements.
Filters consisting of sand, gravel, or other media further remove small particles from the water.
Final filtering step prior to discharge.
Water is returned to the Equalization Tank.
Filter cake is disposed at an offsite landfill.
Thickener
Clarifier
ALLEN FOSSIL PLANT
POND CLOSURE: DEWATERING EAST ASH POND—WATER TREATMENT PROCESS
Weir Tanks
EAST ASH POND - WATER TREATMENT PROCESSAllen Fossil Plant
Sand and Bag Filters
For each water stream, weir tanks are used for bulk solids removal
Modular Tank
Alumina Adsorption
Media
Outfall 002Stilling Pond
East Ash Pond
Final pH Adjustment
Free WaterPore WaterStorm Water
LEGEND
Aci
d
Coa
gula
nt
pH adjustment and coagulant addition (in-line) Large stilling pond allows
settling of solids
Large tank used for settling and equalization when stilling pond has been removed from service
Final pH adjustment (in-line) and discharge to outfall after compliance check
Filtration of solids using sand and bag filters
Special media filters to capture dissolved arsenic during pore water removal
ALLEN FOSSIL PLANT
INTERIM RESPONSE ACTION: GROUNDWATER TREATMENT PROCESS
Equalization Tank
North and South Well
Fields
Flocculation Tank
Post-Clarification
Reaction Tank
FeCl Acid Base
Filter Cake
Polymer
Offsite Disposal
T.E. Maxson Wastewater Treatment
Plant
Press
GROUNDWATER INTERIM RESPONSE ACTION - TREATMENT PROCESSAllen Fossil Plant
Multi-Media Filters
Bag Filter
Thickener
Clarifier
ALLEN FOSSIL PLANT
POND CLOSURE: DEWATERING EAST ASH POND—WATER TREATMENT PROCESS
Weir Tanks
EAST ASH POND - WATER TREATMENT PROCESSAllen Fossil Plant
Sand and Bag Filters
Modular Tank
Alumina Adsorption
Media
Outfall 002Stilling Pond
East Ash Pond
Final pH Adjustment
Free WaterPore WaterStorm Water
LEGEND
Aci
d
Coa
gula
nt
ALLEN FOSSIL PLANT
ENVIRONMENTAL IMPACT STATEMENT—PROJECT AREA
East Ash Pond Complex
_̂
Allen Fossil Plant
K e n t uckyM i s s ouri
T e n n e ssee
A l a b amaM i s s i s sippi
A r k a nsas
L o u i s iana
November 2018Project No. 172676009
Client/Project
1Figure No.
Title
Tennessee Valley AuthorityAllen Fossil Plant Memphis, Shelby County, Tennessee
±
Notes
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2. Imagery provided by client (dated 2015)
Environmental Study Area
Legend
East Ash Pond Complex
970 1,940Feet
ALF NEPA Map
0 485
Construction Lay Down Area
West Ash PondMetal Cleaning
PondMetal Cleaning
Pond
East Ash Pond Complex
_̂
Allen Fossil Plant
K e n t uckyM i s s ouri
T e n n e ssee
A l a b amaM i s s i s sippi
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November 2018Project No. 172676009
Client/Project
1Figure No.
Title
Tennessee Valley AuthorityAllen Fossil Plant Memphis, Shelby County, Tennessee
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1,840230Feet
1. Coordinate System: WGS 1984 Web Mercator Auxiliary Sphere
2. Imagery provided by client (dated 2015)
Environmental Study Area
Legend
East Ash Pond Complex
970 1,940Feet
ALF NEPA Map
0 485
Construction Lay Down Area
West Ash PondMetal Cleaning
PondMetal Cleaning
Pond
ALLEN FOSSIL PLANT
REMEDIAL INVESTIGATION—EVALUATE ALLUVIAL AQUIFER + CONNECTIONS
(Clay)
East Ash Disposal Area
Groundwater Flow and Lake Levels
DRAFT
Groundwater flow is predominantly horizontal (not ver�cal)
3. Install wellsand evaluate
Alluvial Aquifer
Evaluate Alluvial aquiferEvaluating the groundwater flow directions helps to understand and predict migration of CCR constituents.
• To evaluate groundwater flow directions near the East Ash Disposal Area, 22 shallow, intermediate, and deep wells were installed and monitored (46 total)
• The outcome was that groundwater flows horizontally and is affected by McKellar Lake
Evaluate connections between aquiferThe Memphis aquifer (sand) is a source for regional drinking water. This deep aquifer is located beneath the shallow Alluvial aquifer, but these aquifers are separated by a clay layer, the upper Claiborne confining unit. TVA, with help from United States Geological Survey, evaluated the connection between these two aquifers and concluded:
Site-Wide Groundwater Quality
Conceptual Cross Sec�on - geological forma�on thicknesses are approximate.
4. Evaluateconnec�ons
between aquifers
?
?
Memphis Aquifer (Sand)
Alluvial AquiferUpper Claiborne Confining Unit (Clay)
TVA ACCTVA ALFMcKellar Lake
Shallow Impacts
Memphis Aquifer (Sand)
Shallow Impacts
• The upper Claiborne confining unit (clay), where present, is low-hydraulic conductivity clay up to 69 feet thick and lies between the Alluvial and Memphis (sand) aquifers
• The stratigraphy of the upper Claiborne confining unit (clay) is offset in the southeast corner of the East Ash Disposal Area. Further evaluation was conducted
• A hydraulic connection between the Alluvial aquifer and Memphis aquifer (sand) was observed under pumping conditions
Concentrations below USEPA drinking water standards
Conceptual Cross Section—geological formation thicknesses are approximate
Conceptual Cross Section—geological formation thicknesses are approximate
ALLEN FOSSIL PLANT
REMEDIAL INVESTIGATION—NEXT STEPS
What are the next steps?
Proposed groundwater interim response action
• Design, construct and operate Groundwater Extraction/Treatment Systems
• Purpose is to control groundwater during pond closure
_̂Allen Fossil Plant
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PMW-14A
PMW-11A
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PMW-04APMW-04B
PMW-14B
PMW-11B
PMW-10B
PMW-07B
PMW-02B
PMW-14C
PMW-11C
PMW-10C
PMW-07C
PMW-02C
PMW-04C
EW-S03
EW-NO2
ALF-217
ALF-213
ALF-217B
ALF-213B
ALF-217A
ALF-213A
ALF-P-4S
ALF-215
ALF-214
ACC-5B
ALF-216
ALF-201
ALF-204
ALF-205
ALF-206
ALF-212
ALF-210
ALF-202
ALF-202B
ALF-203
ALF-203B
ALF-205B
ALF-204B
ALF-201B
ALF-214B
ALF-P-4ALF-203A
ALF-205A
ALF-204A
ALF-212AALF-202AALF-201A
ALF-214A
ACC-3A
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Notes1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TerraServer (2016) & TVA (2015)
1:3,000 (At original document size of 22x34)
0 250 500 750 1,000Feet
Deep Stratigraphic Boring Location Map
3-3
Tennessee Valley AuthorityAllen Fossil Plant
175577013Memphis, Tennessee Prepared by LT on 2019-02-14
Technical Review by JJ on 2019-02-14
Project Location
Client/Project
Figure No.
Title
($$¯
Legend
")Sewer Manhole Location of Force Main Transition toGravity
!( Performance Monitoring Well (PMW) (Shallow)
!( Performance Monitoring Well (PMW) (Intermediate)
!( Performance Monitoring Well (PMW) (Deep)
!( IRA Extraction Well (EW)
Monitoring Well (Shallow)
Monitoring Well (Intermediate)
Monitoring Well (Deep)
!H Production Well (Memphis Sand)
Sanitary Sewer Pipes
East Ash Pond Boundary
!( Deep Stratigraphic Boring
McKellar Lake Gauging Station#0
_̂Allen Fossil Plant
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PMW-10B
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PMW-02B
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PMW-11C
PMW-10C
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PMW-02C
PMW-04C
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EW-NO2
ALF-217
ALF-213
ALF-217B
ALF-213B
ALF-217A
ALF-213A
ALF-P-4S
ALF-215
ALF-214
ACC-5B
ALF-216
ALF-201
ALF-204
ALF-205
ALF-206
ALF-212
ALF-210
ALF-202
ALF-202B
ALF-203
ALF-203B
ALF-205B
ALF-204B
ALF-201B
ALF-214B
ALF-P-4ALF-203A
ALF-205A
ALF-204A
ALF-212AALF-202AALF-201A
ALF-214A
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Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TerraServer (2016) & TVA (2015)
1:3,000 (At original document size of 22x34)
0 250 500 750 1,000Feet
Deep Stratigraphic Boring Location Map
3-3
Tennessee Valley AuthorityAllen Fossil Plant
175577013Memphis, Tennessee Prepared by LT on 2019-02-14
Technical Review by JJ on 2019-02-14
Project Location
Client/Project
Figure No.
Title
($$¯
Legend
")Sewer Manhole Location of Force Main Transition toGravity
!( Performance Monitoring Well (PMW) (Shallow)
!( Performance Monitoring Well (PMW) (Intermediate)
!( Performance Monitoring Well (PMW) (Deep)
!( IRA Extraction Well (EW)
Monitoring Well (Shallow)
Monitoring Well (Intermediate)
Monitoring Well (Deep)
!H Production Well (Memphis Sand)
Sanitary Sewer Pipes
East Ash Pond Boundary
!( Deep Stratigraphic Boring
McKellar Lake Gauging Station#0
_̂Allen Fossil Plant
CrittendenCross
Lee
St. Francis
DeSoto
Marshall
Tate
Tunica
Shelby
Benton
FayetteArkansas
Mississippi
Tennessee
")
!(!(!(
!(!(!(
!(!(!( !(
!(!(!(!(!(!(
!(!(!(!(
!(
!(
!(
!(
#0
Forc
e M
ain
(Act
ive)
30"
Forc
e M
ain
(Act
ive)
16"
(sle
eved
thro
ugh
old
30"
Forc
e M
ain)
PMW-07A
PMW-14A
PMW-11A
PMW-10A
PMW-02A
PMW-04APMW-04B
PMW-14B
PMW-11B
PMW-10B
PMW-07B
PMW-02B
PMW-14C
PMW-11C
PMW-10C
PMW-07C
PMW-02C
PMW-04C
EW-S03
EW-NO2
ALF-217
ALF-213
ALF-217B
ALF-213B
ALF-217A
ALF-213A
ALF-P-4S
ALF-215
ALF-214
ACC-5B
ALF-216
ALF-201
ALF-204
ALF-205
ALF-206
ALF-212
ALF-210
ALF-202
ALF-202B
ALF-203
ALF-203B
ALF-205B
ALF-204B
ALF-201B
ALF-214B
ALF-P-4ALF-203A
ALF-205A
ALF-204A
ALF-212AALF-202AALF-201A
ALF-214A
ACC-3A
ACC-5A
ACC-1A
ALF-210A
Forc
e M
ain-
30-in
chFo
rce
Mai
n-30
-inch
Gra
vity
-42-
inch
Gravity-60-inch
Gravity-96-inch
Forc
e M
ain-
30-in
ch
Well #2
Well #5
Well #1
Well #4
Well #3
McKellarLake
ALF-P-4C
ALF-205C
ALF-212C
ALF-214C
U:\T
VA
-EIP
\175
5672
95\g
is\m
xds\
AC
C\A
LF_3
-3_D
eepS
tratig
raph
icLo
catio
ns.m
xd
Re
vise
d: 2
019-
02-1
4 By
: LBl
ack
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n
Disclaimer: Stantec assumes no responsibility for data supplied in electronic 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. Page 01 of 01
Notes1.2.
Coordinate System: NAD 1983 StatePlane Tennessee FIPS 4100 FeetImagery Provided by TerraServer (2016) & TVA (2015)
1:3,000 (At original document size of 22x34)
0 250 500 750 1,000Feet
Deep Stratigraphic Boring Location Map
3-3
Tennessee Valley AuthorityAllen Fossil Plant
175577013Memphis, Tennessee Prepared by LT on 2019-02-14
Technical Review by JJ on 2019-02-14
Project Location
Client/Project
Figure No.
Title
($$¯
Legend
")Sewer Manhole Location of Force Main Transition toGravity
!( Performance Monitoring Well (PMW) (Shallow)
!( Performance Monitoring Well (PMW) (Intermediate)
!( Performance Monitoring Well (PMW) (Deep)
!( IRA Extraction Well (EW)
Monitoring Well (Shallow)
Monitoring Well (Intermediate)
Monitoring Well (Deep)
!H Production Well (Memphis Sand)
Sanitary Sewer Pipes
East Ash Pond Boundary
!( Deep Stratigraphic Boring
McKellar Lake Gauging Station#0