NC0000396_SARP_Rev 0_ Appendix A_20161219

Amec Foster Wheeler Environment & Infrastructure, Inc. December 2016
Duke Energy Coal Combustion Residuals Management Program
Asheville Steam Electric Generating Plant Site Analysis and Removal Plan
Revision 0
Appendix A – Waste Inventory Analysis (1964 Ash Basin)
Asheville Steam Station – Waste Strategy Analysis WBS 2, Rev. 1A
AMEC Project No. 7810-14-0162.02 January 12, 2015
1

CALCULATION COVER SHEET

Project
Asheville Steam Station – Waste Strategy Analysis
Calc/Analysis No.
WBS 2
AMEC Project No.
7810-14-0162.02
Title
Estimate of Coal Combustion Residuals (CCR) Quantity
Client Contract
NA
Sheet No. 1 of 5

Discipline
Civil

Computer Program
AutoDesk Civil 3D 2013
Version / Release No. N/A
Purpose and Objective
Estimate the quantity of CCR located on Asheville Steam Station property
(excluding material that is currently being removed).

Quality Assurance Conditions (e.g. safety
classification)
NA

Summary of Conclusion
Based on the assumptions described in this calculation, the quantity of CCR on the Asheville Steam Station site (excluding material that is
currently being removed) was estimated to be approximately 2,113,000 cubic yards (2.1 million dry tons).

Revision Log
Rev. No. Revision Description
00 Initial issue.
1A Refined volume calculations. Separated from landfill size calculations.

Sign Off
Rev. No. Originator (Print)
Sign / Date Verification Method Verifier (Print)
Sign / Date
Technical Lead (Print)
Sign / Date
00 Design Review

Chris Jordan, EI Thomas B. Maier, PE Ken Daly, PE
1A 1/12/2015 1/12/2015 1/14/2015

Additional Reviewer (Print) Signature Date
NA

Asheville Steam Station – Waste Strategy Analysis WBS 2, Rev. 1A
AMEC Project No. 7810-14-0162.02 January 12, 2015
2

RECORD OF REVISION

Revision
No. Date Revisions Made
00 11/05/2014 Initial issue
1A 1/12/2015 Refined volume calculations. Separated from landfill size calculations.

Asheville Steam Station – Waste Strategy Analysis WBS 2, Rev. 1A
AMEC Project No. 7810-14-0162.02 January 12, 2015
3

TABLE OF CONTENTS

CALCULATION COVER SHEET ................................................................................................................ 1 
RECORD OF REVISION .......................................................................................................................... 2 
1.0 OBJECTIVE ................................................................................................................................ 4 
2.0 ASSUMPTIONS .......................................................................................................................... 4 
3.0 APPROACH ............................................................................................................................... 4 
4.0 CONCLUSIONS .......................................................................................................................... 5 

LIST OF TABLES
Table 1: Summary of Areas Containing Ash Included in this Analysis ....................................................... 5 

Asheville Steam Station – Waste Strategy Analysis WBS 2, Rev. 1A
AMEC Project No. 7810-14-0162.02 January 12, 2015

4

1.0 OBJECTIVE

The objective of this calculation is to estimate the quantity of coal combustion residuals (CCR) located on
Asheville Steam Station property (excluding material that is currently being removed). The areas
containing CCR are shown on the attached Figure 1.

2.0 ASSUMPTIONS

The following assumptions and limitations are noted.

 Based on data gathered from several coal burning plants, the following typical CCR properties
are assumed:

Material Dry Unit Weight
(tons/cy)
Moisture Content
(%)
Moist Unit Weight
(%)
CCR in Wet Ponds 0.8 50% 1.2
CCR in Ash Fills 1.0 20% 1.2

 Since the 1964 Ash Pond has not impounded water for many years and there has been
significant dry stacking/filling on the pond, it is assumed to have properties closer to those in the
second row of the above table.
3.0 APPROACH

Material quantities were estimated using a method that consists of utilizing historical ground surface
topographic information from historic design drawings or USGS mapping, and using AutoCAD Civil 3D
software to compare the historic ground surface with current conditions.

Quantity of Material Within the 1964 Ash Basin
(see attached Figures 2.1 through 2.5)

The area of the 1964 Ash Basin is approximately 41 acres (See Table 1). The quantity of material within
the 1964 Ash Basin was estimated using AutoCAD Civil 3D software. An approximate pre-fill ground
surface was generated based on the approximate topographic information shown in Brown and Root
Drawing G-221-B Rev. B dated 7/29/1971 (topography dated 12/30/1969). The pre-fill grades were
compared to 4/3/2012 topography obtained from the North Carolina Flood Plain Mapping LIDAR
geodatabase. In addition, a surface was generated to approximate the 2013 settling basin excavation by
Charah based on the drawing entitled, “ ’64 Rim Ditch & Settling Basin Improvements – Layout/Grading
Plan” revised 1/29/13. The estimated quantity of material within the 1964 Ash Basin is provided in
Table 1.

Data Limitations
The following data limitations, which are potential sources of inaccuracies in the calculated volumes,
have been identified: Drawing G-221-B used for the 1964 basin bottom topography shows standing water
which decreases the calculated pond volume, and the volume of FGD wastewater pond material that may
need to be disposed separately is not known.

Asheville Steam Station – Waste Strategy Analysis WBS 2, Rev. 1A
AMEC Project No. 7810-14-0162.02 January 12, 2015

5

4.0 CONCLUSIONS

Based on the assumptions described in this calculation, the quantity of CCR in the Asheville Steam
Station 1964 Ash Basin was estimated to be approximately 2,113,000 cubic yards (2,113,000 dry tons).
The estimated moist weight of CCR is also reported in Table 1 because it is a more realistic
representation of the weight of material to be handled during removal and construction activities. Moist
unit weight is calculated based on the assumed dry unit weight and moisture content noted herein.

Table 1: Summary of Areas Containing Ash Included in this Analysis

Description
Surface
Area
(ac)
Volume
(cy)
Estimated
Dry Unit
Weight
(ton/cy)
Estimated Dry
Weight
(tons)
Estimated
Moisture
Content
(%)
Estimated
Moist Unit
Weight
(ton/cy)
Estimated
Moist
Weight*
(tons)
1964 Ash Basin 41.4 2,113,000 1.0 2,113,000 20% 1.2 2,535,600
TOTAL 41.4 2,113,000 2,113,000 2,536,000
*Moist unit weight is used for construction cost estimating purposes.

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REFERENCES1.HIGH RESOLUTION 2010 AERIAL IMAGERY WAS OBTAINED FROM WWW.ESRI.COM.FRENCH BROAD RIVERNOTES:1.ASH BOUNDARIES ARE APPROXIMATE.2.THE 1982 ASH BASIN IS NOT INCLUDED IN THIS INVENTORY. ASH IS CURRENTLY BEING REMOVED FROM THIS
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NOTES1.ASH BOUNDARIES ARE APPROXIMATE.ASH BASIN LIMIT(BASED ON AERIAL IMAGERY)ASH BASIN CROSSSECTION ALIGNMENT(SEE FIGURE 2.5)REFERENCES1.NORTH CAROLINA FLOODPLAIN MAPPING PROGRAM (NCFMP) LIDAR BARE EARTH MASS POINTS PUBLISHED IN

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DATUM NAVD88.
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NOTES:1.COAL COMBUSTION RESIDUALS (CCR) VOLUME WAS CALCULATED USING AUTOCAD CIVIL 3D SOFTWARE.2.RED CONTOURS, IF PRESENT, INDICATE THAT THE BASE SURFACE IS AT HIGHER ELEVATION THAN THE COMPARISON
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DATA QUALITY.REFERENCES:1.'5$:,1*12*%(17,7/('³$6+',6326$/321' '$0*(1(5$//$<287´35(3$5('%<&$52/,1$32:(5


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LEGENDCONTOUR OF "CUT" THICKNESS (SEE NOTE 2)CONTOUR OF CCR THICKNESS (APPROXIMATE)ASH BASIN LIMIT(BASED ON AERIAL IMAGERY)
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ELEVATION (FT)
ELEVATION (FT)
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NOTES:1.AT THE DESIGNATED LIMIT OF ASH BASIN, THE ORIGINAL GROUND SURFACE ELEVATION MAY NOT EQUAL THE "EXISTI
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LIMITATIONS OF DATA QUALITY.REFERENCES:1.'5$:,1*12*%(17,7/('³$6+',6326$/321' '$0*(1(5$//$<287´35(3$5('%<&$52/,1$32:(5

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