NC0004961_RBSS_SARP_Rev0_Appx A_20161219

Amec Foster Wheeler Environment & Infrastructure, Inc. December 2016
Duke Energy Coal Combustion Residuals Management Program
Riverbend Steam Station Site Analysis and Removal Plan
Revision 0

APPENDIX A: RIVERBEND STEAM STATION ASH
INVENTORY

Ash Inventory Ash Basin Closure
Duke Energy – Riverbend Steam Station
Revision 0

Amec Foster Wheeler Project No. 7810-15-0384 1 of 4
11/13/2015

Calculation Title:
Riverbend Steam Station – Ash Inventory
Summary:
Based on the assumptions described in this calculation, the quantity of ash on the Riverbend Steam
Station property was estimated to be approximately 4,316,000 cubic yards (5.2 million wet 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
11/13/15

Chris Jordan
11/13/15
Chad Brown
11/13/15
Ken Daly
11/13/15

Ash Inventory Ash Basin Closure
Duke Energy – Riverbend Steam Station
Revision 0

Amec Foster Wheeler Project No. 7810-15-0384 2 of 4
11/13/2015

OBJECTIVE:
The objective of this calculation is to estimate the quantity of coal combustion residuals (CCR)
located on Riverbend Steam Station property. This estimate includes the ash basins, ash stack
and cinder pit storage area as shown on the attached Figure 1.

ASSUMPTIONS:
The following assumptions 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
(tons/cy)
CCR in Ash Basins 0.8 50% 1.2
CCR in Ash Fills 1.0 20% 1.2

CALCULATIONS:
Quantity of Material within the Ash Ponds
(See attached Figure 1.1 through 1.5)

The quantity of CCR within the ash basins was estimated using AutoCAD Civil 3D. The
approximate pre-fill topography was digitized from three available data sources (Duke Energy
Drawing RB-3010-A (Rev. 8/27/90), a digital scan of USGS Map “Mountain Island Lake (1969),
and twelve borings). The quality of the historic Duke Energy drawing and the USGS Map were
poor and the contours shown were illegible in many areas. Of the twelve borings, eleven were
along the crest of the dams and only one boring was performed within the ash basin. Also the
three data sources conflicted with one another. To account for the discrepancies and gaps in the
source data, a combination of the historic Duke Energy drawing, USGS Map, and borings, along
with engineering judgment were used to estimate the pre-fill topography. Note that to compensate
for the poor quality of historic information, the pre-fill topography was adjusted to yield results
consistent with or close to ash volumes provided by Duke. The typical cross-section that was
used in the volume calculation of the intermediate dike was taken from Section AA-AA on Duke
DWG NO. RB 3011-C. One half of the total intermediate dam volume was subtracted from the
gross volume to calculate the net ash volume for each basin. The pre-fill grades were compared
to recent topography (dated April 2014 by LDSI) and bathymetric survey dated July 2014 by ESP.
The AutoCAD Civil 3D estimated quantity is provided below in Table 1.

Quantity of Material within the Ash Stack
(See attached Figure 2.1 through 2.5)

The quantity of CCR within the ash stack was estimated using AutoCAD Civil 3D. The
approximate pre-fill topography was digitized from Duke Energy Drawing RB-3010 (5/6/57), Duke
Energy Drawing RB-3010-A (Rev. 8/27/90), Duke Energy Drawing V-3.1 (7/21/2015), USGS Map
Ash Inventory Ash Basin Closure
Duke Energy – Riverbend Steam Station
Revision 0

Amec Foster Wheeler Project No. 7810-15-0384 3 of 4
11/13/2015

NI 17.2 (1960), and a digital scan of USGS Map “Mountain Island Lake, N.C.” as well as borings
that were performed in the footprint. The pre-fill grades were compared to recent topography
(dated April 2014 by LDSI). The AutoCAD Civil 3D estimated quantity is provided below in Table
1.

Quantity of Material within the Cinder Pit
(See attached Figure 3.1 through 3.5)

The quantity of CCR within the cinder pit storage area was estimated using AutoCAD Civil 3D.
The approximate pre-fill topography was digitized from Duke Energy Drawing RB-3010 (5/6/57),
Duke Energy Drawing RB-3010-A (Rev. 8/27/90), Duke Energy Drawing V-3.1 (7/21/2015), USGS
Map NI 17.2 (1960), and a digital scan of USGS Map “Mountain Island Lake, N.C.” as well as
borings that were performed in the footprint. The pre-fill grades were compared to recent
topography (dated April 2014 by LDSI). The AutoCAD Civil 3D estimated quantity is provided
below in Table 1.

Table 1: Estimated Volume and Weight of CCRs in Ash Basins and Fills 
Description 
Estimated 
CCR 
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) 
Primary Basin 2,182,795 0.8 1,746,236 50% 1.2 2,619,354 
Secondary Basin 829,490 0.8 663,592 50% 1.2 995,388 
Intermediate Dike* (126,000) N/A 
Ash Stack 1,134,497 1 1,134,497 20% 1.2 1,361,396 
Cinder Pit 168,885 1 168,885 20% 1.2 202,662 
Totals 4,315,667 ‐ 3,713,210 ‐  ‐ 5,178,800 
Notes: * - One half of the total intermediate dam volume was subtracted from the gross volume to calculate the net ash
volume for each basin.

Data Limitations

The following data limitations, which are potential sources of inaccuracies in the calculated
volumes, have been identified. The accuracy of historical topography is less than that of recent
topography and may not reflect the actual bottom of CCR in the ash basins, ash stack and cinder
pit storage area.

CONCLUSIONS:

Based on the assumptions described in this calculation, the quantity of ash on the Riverbend
Steam Station property was estimated to be approximately 4,316,000 cubic yards (3.71 million
dry tons). The estimated moist weight of ash is also reported in Table 1 because it is a more
Ash Inventory Ash Basin Closure
Duke Energy – Riverbend Steam Station
Revision 0

Amec Foster Wheeler Project No. 7810-15-0384 4 of 4
11/13/2015

realistic representation of the mass of material to be handled during removal and construction
activities. Moist weight is calculated based on the assumed dry unit weights and moisture
contents noted herein. No vertical datum conversions were performed to account for the
differences between the topography digitized from the historic information and the more recent
topography. Based on the poor quality of historic information it was difficult to estimate the pre-
fill topography to a level of confidence to support estimating accuracy based on topographic
contours (typically one-half of the contour interval), therefore, the vertical accuracy was not
estimated. Actual CCR volume may be affected by any earthwork that was performed between
the date of historical topography and placement of ash and any earthwork that was performed
after recent topography was surveyed. Note that these estimates may be updated as new
information becomes available.
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
CINDER PIT
ASH STACK
ASH BASIN
1
NOTES:
1. ALL BOUNDARIES ARE APPROXIMATE.
REFERENCES:
1. AERIAL IMAGERY DATED 2010 WAS OBTAINED FROM
SERVICES.NCONEMAP.GOV.
ASH AREAS
AERIAL IMAGERY
SECONDARY BASIN
PRIMARY BASIN
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
CINDER PIT
ASH STACK
1.1
NOTES:
1. IMAGE SHOWN REFERENCES NGVD29 VERTICAL DATUM.
REFERENCES:
1. IMAGE IS PART OF A DIGITAL SCAN OF USGS MAP
"MOUNTAIN ISLAND LAKE, N.C.", DATED 1969.
ASH BASIN LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 1.2 AND RECENT AERIAL IMAGERY)
ASH BASIN
ORIGINAL TOPOGRAPHY
SECONDARY BASIN
PRIMARY BASIN
B115 B114
B113
B112
B103
B108
B109
B110
B111
B105
B106
B104
0+
0
0
5+
0
0
10
+
0
0
1
5
+
0
0
2
0
+
0
0
2
5
+
0
0
2
6
+
5
0
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
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7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
1.2
NOTES:
1. BOUNDARY SHOWN IS APPROXIMATE.
2. THE SURFACE SHOWN WAS DEVELOPED USING DATA FROM
EACH OF THE REFERENCES LISTED BELOW; SIGNIFICANT
INTERPRETATION WAS PERFORMED TO ACCOUNT FOR
DISCREPANCIES AND GAPS IN THE SOURCE DATA.
3. THIS IS AN APPROXIMATION OF THE BOTTOM OF ASH POND
CONTOURS BASED ON THE INFORMATION AVAILABLE TO
AMEC FOSTER WHEELER IN OCTOBER 2015.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
6. BATHYMETRIC SURVEY PERFORMED JULY 2014 BY ESP
ASSOCIATES.
LOCATION OF BOREHOLE DATA USED IN
CONTOUR CREATION (TYP.)
(SEE REFERENCE 5)
ASH BASIN
DIGITIZED BASE CONTOURS
ASH BASIN LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 1.2 AND RECENT AERIAL IMAGERY)
ASH BASIN CROSS SECTION
ALIGNMENT (SEE FIGURE 1.5)
SECONDARY BASIN
PRIMARY BASIN
0+
0
0
5+
0
0
10
+
0
0
1
5
+
0
0
2
0
+
0
0
2
5
+
0
0
2
6
+
5
0
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
1.3
ASH BASIN
RECENT TOPOGRAPHY
NOTES:
1. ASH BASIN BOUNDARY SHOWN IS APPROXIMATE.
REFERENCES:
1. EXISTING TOPOGRAPHY SHOWN IS FROM AN AERIAL SURVEY
PERFORMED APRIL 2014 BY LDSI.
2. BATHYMETRIC SURVEY PERFORMED JULY 2014 BY ESP
ASSOCIATES.
ASH BASIN LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 1.2 AND RECENT AERIAL IMAGERY)
BATHYMETRIC SURVEY DATA IN ASH BASIN
(SEE REFERENCE 2)
ASH BASIN CROSS SECTION
ALIGNMENT (SEE FIGURE 1.5)
SECONDARY BASIN
PRIMARY BASIN
0+
0
0
5+
0
0
10
+
0
0
1
5
+
0
0
2
0
+
0
0
2
5
+
0
0
2
6
+
5
0
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
1.4
ASH BASIN
ISOPACH
Volume Summary
Name 2D Area
(acres)
Cut
(Cu. Yd.)
Fill
(Cu. Yd.)
Base Comparison
Primary Basin 45.19 250 2,246,045 ASH BASIN CROSS SECTION
ALIGNMENT (SEE FIGURE 1.5)
ASH BASIN LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 1.2 AND RECENT AERIAL IMAGERY)
MAXIMUM CCR THICKNESS
IS APPROXIMATELY 73 FT.
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
SURFACE. THIS MAY BE DUE TO REGRADING AND/OR
LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.
7. BATHYMETRIC SURVEY PERFORMED JULY 2014 BY ESP
ASSOCIATES.
References 1~5 References 6~7
LEGEND
CONTOUR OF "CUT" THICKNESS (SEE NOTE 2)
CONTOUR OF CCR THICKNESS (APPROXIMATE)
31.55 2,998 895,488 References 1~5 References 6~7
76.73 3,248 3,141,533 References 1~5 References 6~7
Secondary Basin
Total Ash Basins
SECONDARY BASIN
PRIMARY BASIN
126,000 cu. yd.Intermediate Dike - volume of soil
Gross
(Cu. Yd.)
Net*
(Cu. Yd.)
2,245,795 2,182,795
892,490 829,490
3,138,285 3,012,285
*INTERMEDIATE DIKE TYPICAL CROSS-SECTION USED IN VOLUME CALCULATION TAKEN FROM SECTION AA-AA
ON DUKE DWG NO. RB 3011-C. ONE HALF OF THE TOTAL INTERMEDIATE DIKE VOLUME WAS SUBTRACTED
FROM THE GROSS VOLUME TO CALCULATE THE NET ASH VOLUME FOR EACH BASIN.
EL
E
V
A
T
I
O
N

(
F
T
)
EL
E
V
A
T
I
O
N

(
F
T
)
ASH BASIN CROSS SECTION
652
655
660
665
670
675
680
685
690
695
700
705
710
715
720
725
730
735
740
745
750
652
655
660
665
670
675
680
685
690
695
700
705
710
715
720
725
730
735
740
745
750
0+
0
0
0+
5
0
1+
0
0
1+
5
0
2+
0
0
2+
5
0
3+
0
0
3+
5
0
4+
0
0
4+
5
0
5+
0
0
5+
5
0
6+
0
0
6+
5
0
7+
0
0
7+
5
0
8+
0
0
8+
5
0
9+
0
0
9+
5
0
10
+
0
0
10
+
5
0
11
+
0
0
11
+
5
0
12
+
0
0
12
+
5
0
13
+
0
0
13
+
5
0
14
+
0
0
14
+
5
0
15
+
0
0
15
+
5
0
16
+
0
0
16
+
5
0
17
+
0
0
17
+
5
0
18
+
0
0
18
+
5
0
19
+
0
0
19
+
5
0
20
+
0
0
20
+
5
0
21
+
0
0
21
+
5
0
22
+
0
0
22
+
5
0
23
+
0
0
23
+
5
0
24
+
0
0
24
+
5
0
25
+
0
0
25
+
5
0
26
+
0
0
26
+
5
0
26
+
5
0
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC 1.5
ASH BASIN
CROSS SECTION
STATIONS (FT.)
RIVERBEND STEAM STATION ASH BASIN
NOTES:
1. AT THE DESIGNATED LIMIT OF ASH BASIN, THE ORIGINAL GROUND SURFACE MAY NOT EQUAL THE "EXISTING"
GROUND SURFACE ELEVATION DUE TO REGRADING AND/OR LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.", DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - ASH STORAGE BASIN - EARTH &
ROCK FILL DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - UNITS #1-#7 - ASH STORAGE
BASIN - EARTH DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED 9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER WHEELER TITLED, "RIVERBEND STEAM STATION ASH
POND CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN", DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.
7. BATHYMETRIC SURVEY PERFORMED JULY 2014 BY ESP ASSOCIATES.
SEE NOTE 1
EMBANKMENT
ASH DEPOSITS
(THICKNESS AND EXTENTS
ARE APPROXIMATE)
EXISTING GROUND SURFACE
(REFERENCE 6)
ORIGINAL GROUND SURFACE
(REFERENCES 1~5)
WATER LEVEL
ELEV. 711
BATHYMETRIC SURVEY DATA
(REFERENCES 7
PRIMARY BASIN
SECONDARY BASIN
INTERMEDIATE DIKE
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
CINDER PIT
ASH STACK
ASH STACK
ORIGINAL TOPOGRAPHY 2.1
ASH STACK LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 2.2 AND RECENT AERIAL IMAGERY)
NOTES:
1. IMAGE SHOWN REFERENCES NGVD29 VERTICAL DATUM.
REFERENCES:
1. IMAGE IS PART OF A DIGITAL SCAN OF USGS MAP
"MOUNTAIN ISLAND LAKE, N.C.", DATED 1969.
B117
B102
B116
B118
B119
B101
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21+00 22+0022+58
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
2.2
LOCATION OF BOREHOLE DATA USED IN
CONTOUR CREATION (TYP.)
(SEE REFERENCE 5)
ASH STACK
DIGITIZED BASE CONTOURS
ASH STACK LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 2.2 AND RECENT AERIAL IMAGERY)
NOTES:
1. BOUNDARY SHOWN IS APPROXIMATE.
2. THE SURFACE SHOWN WAS DEVELOPED USING DATA FROM
EACH OF THE REFERENCES LISTED BELOW; SIGNIFICANT
INTERPRETATION WAS PERFORMED TO ACCOUNT FOR
DISCREPANCIES AND GAPS IN THE SOURCE DATA.
3. THIS IS AN APPROXIMATION OF THE BOTTOM OF ASH POND
CONTOURS BASED ON THE INFORMATION AVAILABLE TO
AMEC FOSTER WHEELER IN OCTOBER 2015.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.
ASH STACK CROSS SECTION
ALIGNMENT (SEE FIGURE 2.5)
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21+00 22+0022+58
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
2.3
ASH STACK
RECENT TOPOGRAPHY
ASH STACK LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 2.2 AND RECENT AERIAL IMAGERY)
NOTES:
1. ASH STACK BOUNDARY SHOWN IS APPROXIMATE.
REFERENCES:
1. EXISTING TOPOGRAPHY SHOWN IS FROM AN AERIAL
SURVEY PERFORMED APRIL 2014 BY LDSI.
ASH STACK CROSS SECTION
ALIGNMENT (SEE FIGURE 2.5)
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21+00 22+0022+58
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
2.4
ASH STACK
ISOPACH
Volume Summary
Name 2D Area
(acres)
Cut
(Cu. Yd.)
Fill
(Cu. Yd.)
Base Comparison
Ash Stack 26.06 6,658 1,134,497
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
SURFACE. THIS MAY BE DUE TO REGRADING AND/OR
LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.LEGEND
CONTOUR OF "CUT" THICKNESS (SEE NOTE 2)
CONTOUR OF CCR THICKNESS (APPROXIMATE)
References 1~5 Reference 6
MAXIMUM CCR THICKNESS
IS APPROXIMATELY 67 FT.
ASH STACK LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 2.2 AND RECENT AERIAL IMAGERY)ASH STACK CROSS SECTION
ALIGNMENT (SEE FIGURE 2.5)
EL
E
V
A
T
I
O
N

(
F
T
)
EL
E
V
A
T
I
O
N

(
F
T
)
ASH STACK CROSS SECTION
662
665
670
675
680
685
690
695
700
705
710
715
720
725
730
735
740
745
750
755
760
765
770
775
780
662
665
670
675
680
685
690
695
700
705
710
715
720
725
730
735
740
745
750
755
760
765
770
775
780
0+
0
0
0+
5
0
1+
0
0
1+
5
0
2+
0
0
2+
5
0
3+
0
0
3+
5
0
4+
0
0
4+
5
0
5+
0
0
5+
5
0
6+
0
0
6+
5
0
7+
0
0
7+
5
0
8+
0
0
8+
5
0
9+
0
0
9+
5
0
10
+
0
0
10
+
5
0
11
+
0
0
11
+
5
0
12
+
0
0
12
+
5
0
13
+
0
0
13
+
5
0
14
+
0
0
14
+
5
0
15
+
0
0
15
+
5
0
16
+
0
0
16
+
5
0
17
+
0
0
17
+
5
0
18
+
0
0
18
+
5
0
19
+
0
0
19
+
5
0
20
+
0
0
20
+
3
8
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
2.5
ASH STACK
CROSS SECTION
STATIONS (FT.)
RIVERBEND STEAM STATION ASH STACK
NOTES:
1. AT THE DESIGNATED LIMIT OF ASH STACK, THE ORIGINAL GROUND SURFACE MAY NOT EQUAL THE "EXISTING"
GROUND SURFACE ELEVATION DUE TO REGRADING AND/OR LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.", DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - ASH STORAGE BASIN - EARTH &
ROCK FILL DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - UNITS #1-#7 - ASH STORAGE
BASIN - EARTH DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED 9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER WHEELER TITLED, "RIVERBEND STEAM STATION ASH
POND CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN", DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.
SEE NOTE 1
ASH DEPOSITS
(THICKNESS AND EXTENTS
ARE APPROXIMATE)
EXISTING GROUND SURFACE
(REFERENCE 6)
ORIGINAL GROUND SURFACE
(REFERENCES 1~5)
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
CINDER PIT
ORIGINAL TOPOGRAPHY 3.1
CINDER PIT LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 3.2 AND RECENT AERIAL IMAGERY)
NOTES:
1. IMAGE SHOWN REFERENCES NGVD29 VERTICAL DATUM.
REFERENCES:
1. IMAGE IS PART OF A DIGITAL SCAN OF USGS MAP
"MOUNTAIN ISLAND LAKE, N.C.", DATED 1969.
CP-38
CP-30
CP-29
CP-52
CP-5
CP-34
CP-35
CP-36
CP-37
CP-4
CP-6
CP-53
CP-27
CP-28
CP-11
CP-25
CP-24CP-1
CP-2
CP-3
CP-10
CP-9
CP-8
CP-7 CP-23
CP-39CP-40
CP-54
CP-42
CP-41
CP-33
CP-43 CP-44
CP-32
CP-45
CP-46
CP-51
CP-31
CP-50
CP-13
CP-12
CP-22 CP-21
CP-20
CP-26
CP-19
CP-14 CP-18
CP-17CP-15
CP-16
CP-47
CP-49
CP-48
0+00
1+00
2+00
3+00
4+00
5+00
6+00
7+00
8+00
9+00
10+00
11+00
12+00
13+00
14+00 14+62
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
3.2
LOCATION OF BOREHOLE DATA USED IN
CONTOUR CREATION (TYP.)
(SEE REFERENCE 5)
CINDER PIT
DIGITIZED BASE CONTOURS
CINDER PIT LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 3.2 AND RECENT AERIAL IMAGERY)
NOTES:
1. BOUNDARY SHOWN IS APPROXIMATE.
2. THE SURFACE SHOWN WAS DEVELOPED USING DATA FROM
EACH OF THE REFERENCES LISTED BELOW; SIGNIFICANT
INTERPRETATION WAS PERFORMED TO ACCOUNT FOR
DISCREPANCIES AND GAPS IN THE SOURCE DATA.
3. THIS IS AN APPROXIMATION OF THE BOTTOM OF ASH POND
CONTOURS BASED ON THE INFORMATION AVAILABLE TO
AMEC FOSTER WHEELER IN OCTOBER 2015.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
CINDER PIT CROSS SECTION
ALIGNMENT (SEE FIGURE 3.5)
0+00
1+00
2+00
3+00
4+00
5+00
6+00
7+00
8+00
9+00
10+00
11+00
12+00
13+00
14+00 14+62
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
3.3
CINDER PIT
RECENT TOPOGRAPHY
NOTES:
1. CINDER PIT BOUNDARY SHOWN IS APPROXIMATE.
REFERENCES:
1. EXISTING TOPOGRAPHY SHOWN IS FROM AN AERIAL
SURVEY PERFORMED IN APRIL 2014 BY LDSI.
CINDER PIT LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 3.2 AND RECENT AERIAL IMAGERY)
CINDER PIT CROSS SECTION
ALIGNMENT (SEE FIGURE 3.5)
0+00
1+00
2+00
3+00
4+00
5+00
6+00
7+00
8+00
9+00
10+00
11+00
12+00
13+00
14+00 14+62
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC
N
3.4
CINDER PIT
ISOPACH
Volume Summary
Name 2D Area
(acres)
Cut
(Cu. Yd.)
Fill
(Cu. Yd.)
Base Comparison
Cinder Pit 13.34 3,703 168,885
MAXIMUM CCR THICKNESS
IS APPROXIMATELY 27 FT.
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
SURFACE. THIS MAY BE DUE TO REGRADING AND/OR
LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.",
DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - ASH STORAGE BASIN - EARTH & ROCK FILL
DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN
BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND
STEAM STATION - UNITS #1-#7 - ASH STORAGE BASIN - EARTH
DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED
9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER
WHEELER TITLED, "RIVERBEND STEAM STATION ASH POND
CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN",
DWG. No. V-3.1, DATED 7-21-2015.
6. AERIAL SURVEY PERFORMED APRIL 2014 BY LDSI.LEGEND
CONTOUR OF "CUT" THICKNESS (SEE NOTE 2)
CONTOUR OF CCR THICKNESS (APPROXIMATE)
References 1~5 Reference 6
CINDER PIT CROSS SECTION
ALIGNMENT (SEE FIGURE 3.5)
CINDER PIT LIMIT
(BASED ON DRAWINGS REFERENCED IN
FIGURE 3.2 AND RECENT AERIAL IMAGERY)
EL
E
V
A
T
I
O
N

(
F
T
)
EL
E
V
A
T
I
O
N

(
F
T
)
CINDER PIT CROSS SECTION
652
655
660
665
670
675
680
685
652
655
660
665
670
675
680
685
-0
+
2
5
0+
0
0
0+
5
0
1+
0
0
1+
5
0
2+
0
0
2+
5
0
3+
0
0
3+
5
0
4+
0
0
4+
5
0
5+
0
0
5+
5
0
6+
0
0
6+
5
0
7+
0
0
7+
5
0
8+
0
0
8+
5
0
9+
0
0
9+
5
0
10
+
0
0
10
+
5
0
11
+
0
0
11
+
5
0
12
+
0
0
12
+
5
0
13
+
0
0
13
+
5
0
14
+
0
0
14
+
5
0
15
+
0
0
15
+
2
5
ISSUE/REVISION DESCRIPTIONYREV D M ENG. APPR.
CLIENT LOGO:
REVIEWED BY:
SCALE:
DATUM:
PROJECTION:
TITLE:
PROJECT:
DATE:
FIGURE NO.
REVISION NO.
PROJECT NO.:
DRAWN BY:
CLIENT:
2801 YORKMONT ROAD, SUITE 100
CHARLOTTE, NC 28208
TEL: [phone] FAX: [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
Amec Foster Wheeler Environment & Infrastructure, Inc.
GASTON COUNTY, NC
DUKE ENERGY
CB
SLS
----
----WASTE STRATEGY ANALYSIS
RIVERBEND - ASH INVENTORY
10/09/2015
0
7810-15-0384
AS NOTED RIVERBEND STEAM STATION, GASTON COUNTY, NC 3.5
CINDER PIT
CROSS SECTION
STATIONS (FT.)
RIVERBEND STEAM STATION CINDER PIT
NOTES:
1. AT THE DESIGNATED LIMIT OF CINDER PIT, THE ORIGINAL GROUND SURFACE MAY NOT EQUAL THE "EXISTING"
GROUND SURFACE ELEVATION DUE TO REGRADING AND/OR LIMITATIONS OF DATA QUALITY.
REFERENCES:
1. DIGITAL SCAN OF USGS MAP "MOUNTAIN ISLAND LAKE, N.C.", DATED 1969, VERTICAL DATUM NGVD29.
2. USGS MAP "CHARLOTTE", MAP NI 17-2, DATED 1960.
3. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - ASH STORAGE BASIN - EARTH &
ROCK FILL DAM - PLAN, PROFILE & SECTIONS", DWG. No. RB-3010, DRAWN BY D. MOORE & LEE, DATED 5-06-57.
4. DRAWING PREPARED BY DUKE ENERGY TITLED, "RIVERBEND STEAM STATION - UNITS #1-#7 - ASH STORAGE
BASIN - EARTH DAMS-PLAN", DWG. No. RB-3010-A, DRAWN BY BAILES, DATED 9-09-57, LAST REVISED 8-27-90.
5. DRAWING PREPARED FOR DUKE ENERGY BY AMEC FOSTER WHEELER TITLED, "RIVERBEND STEAM STATION ASH
POND CCR REMOVAL GRADING PLAN - BORING LOCATION PLAN", DWG. No. V-3.1, DATED 7-21-2015.
6. FIELD SURVEY PERFORMED BY LDSI.
CINDER DEPOSITS
(THICKNESS AND EXTENTS
ARE APPROXIMATE)
EXISTING GROUND SURFACE
(REFERENCE 6)
ORIGINAL GROUND SURFACE
(REFERENCES 1~5)