stantecwattsbaranalysisi

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TVA Disposal Facility AssessmentPhase 1 Plant Summary

Watts Bar Fossil Plant (WBF)

interbedded with thin layers of blocky, sandy siltstone. The RomeFormation consists of variegated red, green, and yellow shale andsiltstone with beds of fine-grained sandstone. Although notdepicted on the geologic mapping, alluvial deposits are likelypresent beneath the portions of the site adjacent to the river.Seismic events affecting eastern Tennessee, and thus the plantsite, primarily emanate from three zones of earthquake activity the New Madrid Seismic Zone (NMSZ), Southern AppalachiaSeismic Zone (SASZ), and the South Carolina Seismic Zone(SCSZ). The most active zone of the SASZ, the East Tennessee

Seismic Zone (ETSZ), extends from northwestern Georgiathrough east Tennessee and is situated in close proximity to theplant. However, most earthquakes emanating from this zone arerelatively low in magnitude, with the largest known event in theETSZ registering a magnitude of 4.6, suggesting a moderate riskof damage from a seismic event. In contrast, if a largeearthquake were to occur within the New Madrid zone to the west,damage to East Tennessee would be possible. The GeologicHazards Map of Tennessee Environmental Geology Series No.5 developed and published by the Tennessee Department ofEnvironment and Conservation (TDEC), Division of Geology andcompiled by Robert Miller (1978) shows the plant to be located inSeismic Risk Zone 2.

Faci l i t ies Reviewed: Slag Disposal Area (AADA-1)Ash Pond / Stilling Pond (AADA-2)


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TVA Disposal Facility AssessmentPhase 1 Coal Combustion Product Disposal

Facility SummaryWatts Bar Fossil Plant (WBF)Slag Disposal Area (AADA-1)

1. General Faci l i ty Informat ion

Faci l i t y

S ta tus: ClosedNID

Ident i f i ca t ion: Not Available

Surface Area

( ins ide dikes) 24.5 AcresMaximum Height

( toe to top o f d ik e) : 12 Feet

Free Water

Volume: N/AMaximum Water

Storage: N/A

Est imat ed CCB

Storage: N/A Dike Length : N/APlant Dischar ge

to Fac i l i t y : N/ACurrent Pool

Elevat ion: N/A

2. Si te V is i t In format ion

Stantec Assessment Team: Robert Fuller, PEBenjamin Phillips, EIT

TVA Staf f Present : Steve Williams (Exit Interview).

Field Assessment Dates: January 16, 2009.

Weather/Si te Condi t ions : Sunny, Cold.

3. Hist ory/Descr ipt ion of Usage

History and Operat ion: Sluiced Disposal.Past Fai lures/Releases: None documented.

4. Ow ner 's Operat ions, Main tenance and Inspect ion In format ion

Emergency Act ion P lan: N/A


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Inspect ions:

5. Document s Rev iewed

See attached Document Log for complete list of documents provided by TVA for review.In particular, the following provided pertinent information for the assessment of thisfacility:TVA Design Drawings : 10W245-01 through 10W245-08.

TVA As-Buil t Draw ings : No drawings were identified as "As-Built".

TVA Const ruct ionTest ing Records:

N/A

TVA Annual

Inspect ion Repor ts :

1967 -2008

Geotechn ic a l Data : N/A

6. Stant ec Fie ld Observat ions

See attached Concerns/Photo Log, Photos, and Site Plan Drawing.

6.1. Inter ior Slopes

Vegetat ion: Needs additional vegetation for erosion protection.

Trees: None.

Wave Wash Protect ion: N/A

Erosion: Minor

Ins tab i l i t i es : None observed.

Animal Bur row s: None observed.


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6.2. Crest

Crest Cover and Slope: Grass

Erosion: None observed.

Al ignment : Consistent.

Set t lement /Crack ing: None observed.

Bare Spots/Rut t ing: Minor.

Width: Measured: N/A Design: N/A

6.3. Exterior Slopes

Vegetat ion: Grass.

Trees: None.

Erosion: Minor.


Uni form Appearance: Yes.

Seepage: None observed.

Benches: N/A

Foundat ions, Drains, Rel ief

Wells , Ins t rument at ion:

Sump to the redwater collection pond is located at the

south eastern end of the area.Animal Bur row s: None observed.

Slope: Measured: N/A Design: N/A

Height : Measured: N/A


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Height of Riser In lets: N/A

Access : N/A

Jo in t s : N/A

Mis-Al ignment : N/A

Closed/Abandoned Conduit s: N/A

6.5. Outlet Pipes

Number : N/A

Size, Type and Mat er ia l : N/A

Headwal l : N/A

Jo in t Separat ions: N/A



7. Notable Observat ions and Concerns

Minor erosion on embankment slopes.

Incomplete drainage structure at north end of area.

8. Recommendat ions

8.1. Phase 2 Engineer ing and Programmat ic Recom mendat ions

None.

8 2 Maintenance Recomm endat ions


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Facility SummaryWatts Bar Fossil Plant (WBF)

Ash Pond and Stilling Pond (AADA-2)

1. General Faci l i ty Informat ion

Faci l i t y

S ta tus: InactiveNID

Ident i f i ca t ion: Not Available

Surface Area

( ins ide dikes) 14.3 AcresMaximum Height

( toe to top o f d ik e) : 30

Free Water

Volume: 5 Acre-feetMaximum Water

Storage: N/A

Est imat ed CCB

Storage: N/A Dike Length : N/APlant Dischar ge

to Fac i l i t y : N/ACurrent Pool

Elevat ion: N/A

2. Si te V is i t In format ion

Stantec Assessment Team: Robert Fuller, PEBenjamin Phillips, EIT

TVA Staf f Present : Steve Williams (Exit Interview)

Field Assessment Dates: January 16, 2009.

Weather/Si te Condi t ions : Sunny, Cold.

3. Hist ory/Descr ipt ion of Usage

History and Operat ion:Built in 1974 for sluiced disposal. Bottom ash dikeconstructed in 1976 to form stilling pond portion.

Past Fai lures/Releases: None documented.

4. Ow ner 's Operat ions, Main tenance and Inspect ion In format ion


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Problems Prev iously

Ident i f ied Dur ing Past TVA

Inspect ions:

Minor seepage along toe of embankment. Erosion alongriverbank adjacent to toe and at spillway outfall.

5. Document s Rev iewed

See attached Document Log for complete list of documents provided by TVA for review.In particular, the following provided pertinent information for the assessment of thisfacility:TVA Design Drawings : 10N245

TVA As-Buil t Draw ings : No drawings were identified as "As-Built".

TVA Const ruct ion

Test ing Records:

N/A

TVA Annual

Inspect ion Repor ts :

1974 -2008

Geotechn ic a l Data : N/A

6. Stant ec Fie ld Observat ions

See attached Concerns/Photo Log, Photos, and Site Plan Drawing.

6.1. Inter ior Slopes

Vegetat ion: None.

Trees: None.

Wave Wash Protect ion: N/A

Erosion: None observed.



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6.2. Crest

Crest Cover and Slope: Grass, bottom ash, gravel, and asphalt pavement.Erosion: None observed.

Al ignment : Consistent.

Set t lement /Crack ing: None observed.

Bare Spots/Rut t ing: Minor.

Width: Measured: N/A Design: N/A

6.3. Exterior Slopes

Vegetat ion: Grass and some woody growth.

Trees: Yes.

Erosion: Minor.Ins tab i l i t i es : None observed.

Uni form Appearance: Yes.

Seepage: None observed

Benches: None observed.

Foundat ions, Drains, Rel ief

Wells , Ins t rument at ion:

Well covers were observed on eastern side of theembankment.

Animal Bur row s: None observed.

Slope: Measured: N/A Design: N/A


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Height of Riser In lets: N/A

Access : Deteriorated metal access bridge.

Jo in t s : N/A



6.5. Outlet Pipes

Number : 3Size, Type and Mat er ia l : Concrete.

Headwal l : Yes

Jo in t Separat ions: N/A


Closed/Abandoned Conduit s:N/A

7. Notable Observat ions and Concerns

Excess vegetation, some woody, on the embankment.

Steep slopes on the embankment.

Erosion on the riverbank below the embankment toe and at the spillway dischargeinto the river.

8. Recommendat ions

8.1. Phase 2 Engineer ing and Programmat ic Recom mendat ions


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8.2. Maintenance Recomm endat ions

Cut and maintain heavy/tall cattail and grass growth on interior slopes of ponds to

allow better observation.

Remove trees/brush from downstream dike slope of Stilling Pond and Ash Pond andoutlet area.

Continue to monitor areas associated with the closure plan.

Continue annual dike and facility inspections.


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TVA Disposal Facility AssessmentPhase 1 Coal Combustion Product Disposal Facility Summary

Watts Bar Fossil Plant (WBF)Slag Disposal Area

Photos, Concerns/Photo Log

Drawing Mark AADA-1-4Lack of vegetative cover on AADA andAADA slopes.


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Watts Bar Fossil Plant (WBF)Ash Pond and Stilling Pond


Drawing Mark P-1-1Excess vegetation on embankment crestand slopes.


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Watts Bar Fossil Plant (WBF)Ash Pond and Stilling Pond


Concerns/Photo Log

Drawing Mark Comments Photo/GPS ID

P-1-1Excess vegetation onembankment crest and slopes. WBF-P-1-1


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Coal Combustion Product Disposal Facility Assessment

Phase 1 Document Review Form


Date

Rev iewed

Rev iewed

by Fi le Nam e

File

Type

4/26/2009 BLP 10N235-Sht -Rev 0.cal CAL




4/26/2009 BLP 10N247-Sht -Rev 1.cal CAL4/26/2009 BLP 10N248-Sht -Rev 0.cal CAL







4/26/2009 BLP 10W200-Sht -Rev 9.cal CAL



4/26/2009 BLP 10W251-Sht -Rev 0.cal CAL4/26/2009 BLP 10W252-Sht -Rev 0.cal CAL



4/26/2009 BLP 10W425-01 Rev 0.cal CAL

4/26/2009 BLP 10W425-02 Rev 0.cal CAL

4/26/2009 BLP 10W425-03 Rev 1.cal CAL

4/26/2009 BLP 10W425-03 Rev 1-.cal CAL

4/26/2009 BLP 10W425-04 Rev 0.cal CAL

4/26/2009 BLP 10W425-05 Rev 0.cal CAL

4/26/2009 BLP 10W425-06 Rev 0.cal CAL

4/26/2009 BLP 10W425-06 Rev 0-.cal CAL

4/26/2009 BLP 10W425-07 Rev 0.cal CAL

4/26/2009 BLP 10W425-07 Rev 0-.cal CAL

4/26/2009 BLP 10W425-08 Rev 0.cal CAL

4/26/2009 BLP 10W425-09 Rev 0.cal CAL

4/26/2009 BLP 10W425-10 Rev 0.cal CAL

4/26/2009 BLP 10W425-11 Rev 0.cal CAL

4/26/2009 BLP 10W425-12 Rev 0.cal CAL



4/26/2009 BLP 15W832-Sht -Rev 2.cal CAL4/26/2009 BLP 17W301-Sht -Rev 3.cal CAL

\\Us1243-f01\workgroup\1714\active\171468118\clerical\report\Document_dir_report.xls Page 1 of 3


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Date

Rev iewed

Rev iewed

by Fi le Nam e

File

Type

4/26/2009 BLP 17W305-1 -Sht -Rev 0.cal CAL

4/27/2009 BLP WBF Agenda Items Restart Plan.pdf PDF

2/18/2009 BLP WBF Ash Pond Insp Fy00.pdf PDF













2/18/2009 BLP WBF Ash Pond Insp Fy73.pdf PDF2/18/2009 BLP WBF Ash Pond Insp Fy74.pdf PDF




















2/18/2009 BLP WBF Ash Pond Insp Fy98.pdf PDF2/18/2009 BLP WBF Ash Pond Insp Fy99.pdf PDF



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Date

Rev iewed

Rev iewed

by Fi le Nam e

File

Type

2/18/2009 BLP WBF Fauem Study.pdf PDF

2/18/2009 BLP WBF Memo And Attachments On Watts Bar Fossil Restart Kick Off Meeting.pdf PDF

2/18/2009 BLP WBF Memo And WBF Documents From Restart Meeting.pdf PDF

2/18/2009 BLP WBF Memo To Mech Eng Files On WBF Restart Meeting.pdf PDF

2/18/2009 BLP WBF Memo To Those Listed From Glwimberly Dated July 3 1991 On WBF Restart Activities.pdf PDF

2/26/2009 BLP WBF_Ash_Pond_Insp_Fy08.pdf PDF
