NC0002468_SARP_Rev0_Appx A_20161201

December 2016Amec Foster Wheeler Environment & Infrastructure, Inc.
Duke Energy Coal Combustion Residuals Management Program
Dan River Steam Station Site Analysis and Removal Plan
Revision 0
APPENDIX A: ASH INVENTORY CALCULATION
Ash Inventory Calculation Dam Decommissioning Plan
Duke Energy - Dan River Steam Station

Amec Foster Wheeler Project No. 7810-14-0065 1 of 4
12/06/2016

Calculation Title:
Ash Inventory Calculation
Summary:
The estimated quantity of ash at Dan River Steam Station is approximately 2,480,000 cubic yards
(2,210,000 dry tons).
Note that these estimates may be updated as new information becomes available.

Notes:
Revision Log:
No. Description Originator Verifier Technical Reviewer
0 Initial Submittal -
12/6/16

Chris Jordan Stephanie Stanwick Cedric Ruhl

Ash Inventory Calculation Dam Decommissioning Plan
Duke Energy - Dan River Steam Station

Amec Foster Wheeler Project No. 7810-14-0065 2 of 4
12/06/2016

OBJECTIVE:
The objective of this calculation is to estimate the in-situ volume and tonnage of coal combustion
residuals (CCR) located in the Primary and Secondary Ash Basins, Ash Fill 1, and Ash Fill 2 at
the Dan River Steam Station.
METHOD:
Historical and current topographic and bathymetric data was utilized to estimate top of ash and
bottom of ash grades for the Primary and Secondary Ash Basins, Ash Fill 1, and Ash Fill 2, and
quantity of soil stockpile on Ash Fill 1. AutoCAD Civil 3D 2013 was used to estimate in-situ
volumes of ash and soil stockpile.
CALCULATIONS:
1.0 Site Summary
In 1948, construction on the Dan River Steam Station began and units 1-3 came online between
1949 and 1956. In 1956, the first ash basin was constructed with a crest elevation of 525 feet.
From 1968-1969, the ash basin was expanded to its current footprint and the crest elevation was
raised to 530 feet. From 1976-1977 an intermediate dike was constructed separating the primary
and secondary basins and raising the Primary Ash Basin crest to 540 feet. In 1980, dredge dikes
were constructed north of the ash basins to support construction of Ash Fills 1 and 2. The coal
units were retired on April 1, 2012 and the production of CCR at the site has stopped. Refer to
Figure 1 for the location of existing CCR units.
2.0 Quantity of Material in Ash Fills 1 and 2
The material in Ash Fills 1 and 2 includes ash placed as fill, cover soils, and additional soil
stockpiled on top of Ash Fill 1. The quantity of material within Ash Fills 1 & 2 was estimated
using AutoCAD Civil 3D software. The extents of ash were delineated based on topographic
features, test pits performed in 2014, and our understanding of the site.
The topography of the bottom of Ash Fills 1 & 2 was estimated based on Drawing D-1037M-5
dated June 5, 1983, provided by Duke Energy and included as Figure 2.1. This drawing
indicates that soil was excavated within the footprints of Ash Fills 1 and 2 for dredge dike
construction. The bottom of ash grades from Drawing D-1037M-5 were digitized in AutoCAD
Civil 3D for surface comparison purposes as shown in Figure 2.2. The bottom of ash grades
are consistent with recent geotechnical boring information.
The current topography of Ash Fills 1 and 2 was based on aerial photogrammetric survey flown
February 7, 2014 and acquired by LDSI as shown in Figure 2.3.
An isopach (i.e. cut/fill map) comparing current topography and bottom of ash grades is
presented in Figure 2.4, and a cross-section of the ash fill CCR units is presented in Figure 2.5.
Refer to the discussion section of this calculation for estimated quantities.
Ash Inventory Calculation Dam Decommissioning Plan
Duke Energy - Dan River Steam Station

Amec Foster Wheeler Project No. 7810-14-0065 3 of 4
12/06/2016

3.0 Quantity of Soil Stockpile and cover soils on Ash Fills 1 and 2
The material in Ash Fills 1 and 2 includes ash placed as fill, cover soils, and additional soil
stockpiled on top of Ash Fill 1. The quantity of soil stockpile material within Ash Fill 1 was
estimated using AutoCAD Civil 3D software. The extents of soil were delineated based on
topographic features and our understanding of the site.
Ash Fill 1 contains two soil stockpiles built on top of the ash. The bottom elevation of the northern
soil stockpile (Soil area 1A) was estimated to be at elevation 628 feet and the bottom elevation of
the southern soil stockpile (Soil area 1B) was estimated to be at elevation 578 feet, based on
recent geotechnical boring information.
A cross-section of the ash fill CCR units showing the soil stockpiles on Ash Fill 1 is presented in
Figure 2.5.
Soil cover over Ash Fills 1 and 2 is assumed to be approximately 2 feet thick. For the purposes
of this calculation it was assumed that 1.5 feet of soil cover will be removed prior to ash
excavation. Refer to the discussion section of this calculation for estimated quantities.
4.0 Quantity of Material in the Primary and Secondary Ash Basins
The material in the Primary and Secondary Ash Basins generally consists of sluiced fly ash and
bottom ash. The quantity of material within the Primary and Secondary Ash Basins was
estimated using AutoCAD Civil 3D software. The extents of ash were delineated based on
topographic features and our understanding of the site.
The topography of the bottom of the Primary and Secondary Ash Basins was estimated based
on Drawing D-1039-M dated May 11, 1994. This drawing was provided by Duke Energy and
included as Figure 3.1. The bottom of ash grades were digitized in AutoCAD Civil 3D for
surface comparison purposes as shown in Figure 3.2.
The top of ash in the Primary Ash Basin is shown on Figure 3.3 and was obtained from aerial
photogrammetric survey flown February 7, 2014 and acquired by LDSI, and bathymetry
performed by LDSI July 29-30, 2014.
An isopach (i.e. cut/fill map) comparing current topography and bottom of ash grades is
presented in Figure 3.4, and a cross-section of the ash basin CCR units is presented in Figure
3.5.
Refer to the discussion section of this calculation for estimated quantities.

Ash Inventory Calculation Dam Decommissioning Plan
Duke Energy - Dan River Steam Station

Amec Foster Wheeler Project No. 7810-14-0065 4 of 4
12/06/2016

DISCUSSION:
Based on data gathered from several coal burning plants, the following typical CCR properties
are assumed:
Material Dry Unit Weight
(tons/cy)
Moisture
Content
(percent)
Moist Unit
Weight
(tons/cy)
CCR in Ash Basins 0.8 50%1.2
CCR in Ash Fills 1.0 20%1.2
Table 1: Assumed CCR Properties

Estimated in-situ volumes are presented in the following table:
Location
Total Quantity
of Material
(cy)
Quantity of
Soil Stockpile
(cy)
Quantity of
Cover Soil
(cy)
Quantity of CCR
(cy)
Ash Fill 1 959,658 116,554 47,698 795,406
Ash Fill 2 380,096 0 34,606 345,490
Subtotal 1,339,754 116,554 82,304 1,140,896
Primary Ash Basin 1,012,267 0 0 1,012,267
Secondary Ash Basin 323,871 0 0 323,871
Subtotal 1,336,138 0 0 1,336,138
TOTAL 2,675,892 116,554 82,304 2,477,034
Table 2: Estimated In-Situ Volume of Material

Estimated in-situ tonnages are presented in the following table:
Location Quantity of CCR
(cy)
Estimated Dry
Unit Weight
(tons/cy)
Estimated Dry
Weight
(tons)
Estimated Moisture
Content
(percent)
Estimated Moist
Unit Weight
(tons/cy)
Estimated Moist
Weight
(tons)
Ash Fill 1 795,406 1.0 795,406 20%1.2 954,487
Ash Fill 2 345,490 1.0 345,490 20%1.2 414,588
Subtotal 1,140,896 N/A 1,140,896 N/A N/A 1,369,075
Primary Ash Basin 1,012,267 0.8 809,814 50%1.2 1,214,720
Secondary Ash Basin 323,871 0.8 259,097 50%1.2 388,645
Subtotal 1,336,138 N/A 1,068,910 N/A N/A 1,603,365
TOTAL 2,477,034 N/A 2,209,806 N/A N/A 2,972,440
Table 3: Estimated Quantities of CCR Material

The estimated quantity of ash at Dan River Steam Station is approximately 2,480,000 cubic yards
(2,210,000 dry tons).

Figures

1 Ash Areas Aerial Imagery

2.1 Ash Fill 1 & 2 Original Topography
2.2 Ash Fill 1 & 2 Digitized Base Contours
2.3 Ash Fill 1 & 2 Recent Topography
2.4 Ash Fill 1 & 2 Isopach
2.5 Ash Fill 1 & 2 Cross Section

3.1 Primary and Secondary Ash Basins Original Topography
3.2 Primary and Secondary Ash Basins Digitized Base Contours
3.3 Primary and Secondary Ash Basins Recent Topography
3.4 Primary and Secondary Ash Basins Isopach
3.5 Primary and Secondary Ash Basins Cross Section
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REFERENCES1.DRAWING NO. DM-1037M-5 ENTITLED “DRY ASH BASIN CONTOURS”, PREPARED BY DUKE POWER COMPANY, R
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NOTES:1. (5FT) CONTOURS WERE DIGITIZED FROM HISTORICAL TOPO SHOWN IN FIGURE 2.1 (REFERENCE 1) .2. A DATUM SHIFT OF -0.75 FT WAS APPLIED TO CONVERT ELEVATIONS FROM NGVD29 TO NAVD88.3. THIS IS A REPRESENTATION OF THE CONTOURS SHOWN IN REFERENCE 1 AND IS AN APPROXIMATION OF THE

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AVAILABLE TO AMEC FOSTER WHEELER IN APRIL 2015.REFERENCES1. RAWING NO. DM-1037M-5 ENTITLED “DRY ASH BASIN CONTOURS”, PREPARED BY DUKE POWER COMPANY, RE
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NOTES1. ASH BOUNDARIES ARE APPROXIMATE.REFERENCES1. AERIAL PHOTOGRAMMETRIC SURVEY FLOWN 2/7/2014 BY LDSI. VERTICAL DATUM NAVD88.ASH FILL 2 LIMIT(BASED ON RECENT AERIAL IMAGERY,TOPOGRAPHY, AND TEST PITS)
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NOTES:1. COAL COMBUSTION RESIDUALS (CCR) VOLUME WAS CALCULATED USING AUTOCAD CIVIL 3D SOFTWARE.2. RED CONTOURS INDICATE THAT THE BASE SURFACE IS AT HIGHER ELEVATION THAN THE COMPARISON SURF
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NOTES1. ASH BOUNDARIES ARE APPROXIMATE.REFERENCES1. AERIAL PHOTOGRAMMETRIC SURVEY FLOWN 2/7/2014 BY LDSI.VERTICAL DATUM NAVD88.2. BATHYMETRY INFORMATION PERFORMED BY LDSI OBTAINED ON SEPTEMBER 4, 2014. VERTICAL DATUM NAVD
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ASH BASIN CROSSSECTION ALIGNMENT(SEE FIGURE 3.5)PRIMARY ASH BASIN LIMIT(BASED ON HISTORICAL DATA)
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NOTES:1. COAL COMBUSTION RESIDUALS (CCR) VOLUME WAS CALCULATED USING AUTOCAD CIVIL 3D SOFTWARE.2. RED CONTOURS INDICATE THAT THE BASE SURFACE IS AT HIGHER ELEVATION THAN THE COMPARISON SURFACE. THI
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TOPOGRAPHY OR BY INACCURACIES IN THE DATA USED.REFERENCES:1.DRAWING NO. D-1039-M ENTITLED "ASH SETTLING BASIN LAYOUT”, PREPARED BY DUKE POWER COMPANY, REV. 22, D
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2. SUPPLEMENTAL BORING DATA POINTS PREPARED BY AMEC FOSTER WHEELER WERE USED TO ESTIMATE THE PRIMA
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3. AERIAL PHOTOGRAMMETRIC SURVEY FLOWN 2/7/2014 BY LDSI. BATHYMETRY INFORMATION PERFORMED BY LDSI OBT
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LEGENDCONTOUR OF "CUT" THICKNESS (SEE NOTE 2)CONTOUR OF CCR THICKNESS (APPROXIMATE)
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ASH BASIN CROSSSECTION ALIGNMENT(SEE FIGURE 3.5)MAXIMUM CCR THICKNESSIS APPROXIMATELY 39 FT.
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AND/OR LIMITATIONS OF DATA QUALITY.REFERENCES:1.DRAWING NO. D-1039-M ENTITLED "ASH SETTLING BASIN LAYOUT”, PREPARED BY DUKE POWER COMPANY, RE
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TO NAVD88.2. SUPPLEMENTAL BORING DATA POINTS PREPARED BY AMECFW WERE USED TO ESTIMATE THE PRIMARY ASH
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3. AERIAL PHOTOGRAMMETRIC SURVEY FLOWN 2/7/2014 BY LDSI. BATHYMETRY INFORMATION PERFORMED BY L
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EXISTING GROUND SURFACE(REFERENCE 3)EMBANKMENT
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